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2.2.25 2024-12-11

Fixed deprecation notices appearing on this LTS version in case it is used on modern PHP. Modern PHP support is not guaranteed nor tested for though and the main purpose of LTS releases is legacy PHP versions support. (#12217)
Fixed issue on plugin upgrade when it defines multiple classes (#12226)
Fixed duplicate errors appearing in the output depending on php settings (#12214)
Fixed InstalledVersions returning duplicate data in some instances (#12225)

2.2.24 2024-06-10

Security: Fixed command injection via malicious git branch name (GHSA-47f6-5gq3-vx9c / CVE-2024-35241)
Security: Fixed multiple command injections via malicious git/hg branch names (GHSA-v9qv-c7wm-wgmf / CVE-2024-35242)
Security: Fixed secure-http checks that could be bypassed by using malformed URL formats (fa3b9582c)
Security: Fixed Filesystem::isLocalPath including windows-specific checks on linux (3c37a67c)
Security: Fixed perforce argument escaping (3773f775)
Security: Fixed handling of zip bombs when extracting archives (de5f7e32)
Security: Fixed Windows command parameter escaping to prevent abuse of unicode characters with best fit encoding conversion (3130a7455, 04a63b324)

2.2.23 2024-02-08

Security: Fixed code execution and possible privilege escalation via compromised vendor dir contents (GHSA-7c6p-848j-wh5h / CVE-2024-24821)

2.2.22 2023-09-29

Security: Fixed possible remote code execution vulnerability if composer.phar is publicly accessible, executable as PHP, and register_argc_argv is enabled in php.ini (GHSA-jm6m-4632-36hf / CVE-2023-43655)
Fixed authentication issue when downloading several files from private Bitbucket in parallel (#11464)
Fixed handling of broken junctions on windows (#11550)
Fixed loading of root aliases on path repo packages when doing partial updates (#11632)
Fixed parsing of lib-curl-openssl version with OSX SecureTransport (#11534)
Fixed binary proxies not being transparent when included by another PHP process and returning a value (#11454)
Fixed support for plugin classes being marked as readonly (#11404)
Fixed GitHub rate limit reporting (#11366)
Fixed issue displaying solver problems with branch names containing % signs (#11359)

2.2.21 2023-02-15

Fixed extra.plugin-optional support in PluginInstaller when doing pre-install checks (#11326)

2.2.20 2023-02-10

Added extra.plugin-optional support for allow auto-disabling unknown plugins which are not critical when running non-interactive (#11315)

2.2.19 2023-02-04

Fixed URL sanitizer to handle new GitHub personal access tokens format (#11137)
Fixed cache keys to allow _ to avoid conflicts between package names like a-b and a_b (#11229)
Fixed handling of --ignore-platform-req with upper-bound ignores to not apply to conflict rules (#11037)
Fixed handling of COMPOSER_DISCARD_CHANGES when set to 0

2.2.18 2022-08-20

Fixed COMPOSER_NO_DEV so it also works with require and remove's --update-no-dev (#10995)
Fixed duplicate missing extension warnings being displayed (#10938)
Fixed hg version detection (#10955)
Fixed git cache invalidation issue when a git tag gets created after the cache has loaded a given reference (#11004)

2.2.17 2022-07-13

Fixed plugins from CWD/vendor being loaded in some cases like create-project or validate even though the target directory is outside of CWD (#10935)
Fixed support for legacy (Composer 1.x, e.g. hirak/prestissimo) plugins which will not warn/error anymore if not in allow-plugins, as they are anyway not loaded (#10928)
Fixed pre-install check for allowed plugins not taking --no-plugins into account (#10925)
Fixed support for disable_functions containing disk_free_space (#10936)
Fixed RootPackageRepository usages to always clone the root package to avoid interoperability issues with plugins (#10940)

2.2.16 2022-07-05

Fixed non-interactive behavior of allow-plugins to throw instead of continue with a warning to avoid broken installs (#10920)
Fixed allow-plugins BC mode to ensure old lock files created pre-2.2 can be installed with only a warning but plugins fully loaded (#10920)
Fixed deprecation notice (#10921)

2.2.15 2022-07-01

Fixed support for cache-read-only where the filesystem is not writable (#10906)
Fixed type error when using allow-plugins: true (#10909)
Fixed @putenv scripts receiving arguments passed to the command (#10846)
Fixed support for spaces in paths with binary proxies on Windows (#10836)
Fixed type error in GitDownloader if branches cannot be listed (#10888)
Fixed RootPackageInterface issue on PHP 5.3.3 (#10895)

2.2.14 2022-06-06

Fixed handling of broken symlinks when checking whether a package is still installed (#6708)
Fixed JSON schema regex pattern for name to be JS compatible (#10811)
Fixed bin proxies to allow a proxy to include another one safely (#10823)
Fixed gitlab-token JSON schema definition (#10800)
Fixed openssl 3.x version parsing as it is now semver compliant
Fixed type error when a json file cannot be read (#10818)
Fixed parsing of multi-line arrays in funding.yml (#10784)

2.2.13 2022-05-25

Fixed invalid credentials loop when setting up GitLab token (#10748)
Fixed PHP 8.2 deprecations (#10766)
Fixed lock file changes being output even when the lock file creation is disabled
Fixed race condition when multiple requests asking for auth on the same hostname fired concurrently (#10763)
Fixed quoting of commas on Windows (#10775)
Fixed issue installing path repos with a disabled symlink function (#10786)

2.2.12 2022-04-13

Security: Fixed command injection vulnerability in HgDriver/GitDriver (GHSA-x7cr-6qr6-2hh6 / CVE-2022-24828)
Fixed curl downloader not retrying when a DNS resolution failure occurs (#10716)
Fixed composer.lock file still being used/read when the lock config option is disabled (#10726)
Fixed validate command checking the lock file even if the lock option is disabled (#10723)

2.2.11 2022-04-01

Added missing config.bitbucket-oauth in composer-schema.json
Added --2.2 flag to self-update to pin the Composer version to the 2.2 LTS range (#10682)
Updated semver, jsonlint deps for minor fixes
Fixed generation of autoload crashing if a package has a broken path (#10688)
Removed dev-master=>dev-main alias from #10372 as it does not work when reloading from lock file and extracting dev deps (#10651)

2.2.10 2022-03-29

Fixed Bitbucket authorization detection due to API changes (#10657)
Fixed validate command warning about dist/source keys if defined (#10655)
Fixed deletion/handling of corrupted 0-bytes zip archives (#10666)

2.2.9 2022-03-15

Fixed regression with plugins that modify install path of packages, see docs if you are authoring such a plugin (#10621)

2.2.8 2022-03-15

Fixed files autoloading sort order to be fully deterministic (#10617)
Fixed pool optimization pass edge cases (#10579)
Fixed require command failing when self.version is used as constraint (#10593)
Fixed --no-ansi / undecorated output still showing color in repo warnings (#10601)
Performance improvement in pool optimization step (composer/semver#131)

2.2.7 2022-02-25

Allow installation together with composer/xdebug-handler ^3 (#10528)
Fixed support for packages with no licenses in licenses command output (#10537)
Fixed handling of allow-plugins: false which kept warning (#10530)
Fixed enum parsing in classmap generation when the enum keyword is not lowercased (#10521)
Fixed author parsing in init command requiring an email whereas the schema allows a name only (#10538)
Fixed issues in require command when requiring packages which do not exist (but are provided by something else you require) (#10541)
Performance improvement in pool optimization step (#10546)

2.2.6 2022-02-04

BC Break: due to an oversight, the COMPOSER_BIN_DIR env var for binaries added in Composer 2.2.2 had to be renamed to COMPOSER_RUNTIME_BIN_DIR (#10512)
Fixed enum parsing in classmap generation with syntax like enum foo:string without space after : (#10498)
Fixed package search not urlencoding the input (#10500)
Fixed reinstall command not firing pre-install-cmd/post-install-cmd events (#10514)
Fixed edge case in path repositories where a symlink: true option would be ignored on old Windows and old PHP combos (#10482)
Fixed test suite compatibility with latest symfony/console releases (#10499)
Fixed some error reporting edge cases (#10484, #10451, #10493)

2.2.5 2022-01-21

Disabled composer/package-versions-deprecated by default as it can function using Composer\InstalledVersions at runtime (#10458)
Fixed artifact repositories crashing if a phar file was present in the directory (#10406)
Fixed binary proxy issue on PHP <8 when fseek is used on the proxied binary path (#10468)
Fixed handling of non-string versions in package repositories metadata (#10470)

2.2.4 2022-01-08

Fixed handling of process timeout when running async processes during installation
Fixed GitLab API handling when projects have a repository disabled (#10440)
Fixed reading of environment variables (e.g. APPDATA) containing unicode characters to workaround a PHP bug on Windows (#10434)
Fixed partial update issues with path repos missing if a path repo is required by a path repo (#10431)
Fixed support for sourcing binaries via the new bin proxies (#10389)
Fixed messaging when GitHub tokens need SSO authorization (#10432)

2.2.3 2021-12-31

Fixed issue with PHPUnit and process isolation now including PHPUnit <6.5 (#10387)
Fixed interoperability issue with laminas/laminas-zendframework-bridge and Composer 2.2 (#10401)
Fixed binary proxies for shell scripts to work correctly when they are symlinked (jakzal/phpqa#336)
Fixed overly greedy pool optimization in cases where a locked package is not required by anything anymore in a partial update (#10405)

2.2.2 2021-12-29

Added COMPOSER_BIN_DIR env var and _composer_bin_dir global containing the path to the bin-dir for binaries. Packages relying on finding the bin dir with $BASH_SOURCES[0] will need to update their binaries (#10402)
Fixed issue when new binary proxies are combined with PHPUnit and process isolation (#10387)
Fixed deprecation warnings when using Symfony 5.4+ and requiring composer/composer itself (#10404)
Fixed UX of plugin warnings (#10381)

2.2.1 2021-12-22

Fixed plugin autoloading including files autoload rules from the root package (#10382)
Fixed issue parsing php files with unterminated comments found inside backticks (#10385)

2.2.0 2021-12-22

Added support for using dev-main as the default path repo package version if no VCS info is available (#10372)
Added --no-scripts as a globally supported flag to all Composer commands to disable scripts execution (#10371)
Fixed self-update failing in some edge cases due to loading plugins (#10371)
Fixed display of conflicts showing the wrong package name in some conditions (#10355)

2.2.0-RC1 2021-12-08

Bumped composer-runtime-api and composer-plugin-api to 2.2.0
UX Change: Added allow-plugins config value to enhance security against runtime execution, this will prompt you the first time you use a plugin and may hang pipelines if they aren't using --no-interaction (-n) as they should (#10314)
Added an optimization pass to reduce the amount of redundant inspected during resolution, drastically improving memory and CPU usage (#9261, #9620)
Added a global $_composer_autoload_path variable containing the path to autoload.php for binaries (#10137)
Added wildcard support to --ignore-platform-req (e.g. ext-*) (#10083)
Added support for ignoring the upper bound of platform requirements using "name+" notation e.g. using --ignore-platform-req=php+ would allow installing a package requiring php: 8.0.* on PHP 8.1, but not on PHP 7.4. Useful for CI builds of upcoming PHP versions (#10318)
Added support for setting platform packages to false in config.platform to disable/hide them (#10308)
Added use-parent-dir option to configure the prompt for using composer.json in upper directory when none is present in current dir (#10307)
Added composer platform package which is always the exact version of Composer running unlike composer-*-api packages (#10313)
Added a --source flag to config command to show where config values are loaded from (#10129)
Added support for files autoloaders in the runtime scripts/plugins contexts (#10065)
Added retry behavior on certain http status and curl error codes (#10162)
Added abandoned flag display in search command output
Added support for --ignore-platform-reqs in outdated command (#10293)
Added --only-vendor (-O) flag to search command to search (and return) vendor names (#10336)
Added COMPOSER_NO_DEV environment variable to set the --no-dev flag (#10262)
Fixed archive command to behave more like git archive, gitignore/hgignore are not taken into account anymore, and gitattributes support was improved (#10309)
Fixed unlocking of replacers when a replaced package is unlocked (#10280)
Fixed auto-unlocked path repo packages also unlocking their transitive deps when -w/-W is used (#10157)
Fixed handling of recursive package links (e.g. requiring or replacing oneself)
Fixed env var reads to check _SERVER and _ENV before getenv for broader ecosystem compatibility (#10218)
Fixed archive command to produce archives with files sorted by name (#10274)
Fixed VcsRepository issues where server failure could cause missing tags/branches (#10319)
Fixed some error reporting issues (#10283, #10339)

2.1.14 2021-11-30

Fixed invalid release build

2.1.13 2021-11-30

Removed symfony/console ^6 support as we cannot be compatible until Composer 2.3.0 is released. If you have issues with Composer required as a dependency + Symfony make sure you stay on Symfony 5.4 for now. (#10321)

2.1.12 2021-11-09

Fixed issues in proxied binary files relying on FILE / DIR on php <8 (#10261)
Fixed 9999999-dev being shown in some cases by the show command (#10260)
Fixed GitHub Actions output escaping regression on PHP 8.1 (#10250)

2.1.11 2021-11-02

Fixed issues in proxied binary files when using declare() on php <8 (#10249)
Fixed GitHub Actions output escaping issues (#10243)

2.1.10 2021-10-29

Added type annotations to all classes, which may have an effect on CI/static analysis for people using Composer as a dependency (#10159)
Fixed CurlDownloader requesting gzip encoding even when no gzip support is present (#10153)
Fixed regression in 2.1.6 where the help command was not working for plugin commands (#10147)
Fixed warning showing when an invalid cache dir is configured but unused (#10125)
Fixed require command reverting changes even though dependency resolution succeeded when something fails in scripts for example (#10118)
Fixed require not finding the right package version when some newly required extension is missing from the system (#10167)
Fixed proxied binary file issues, now using output buffering (e1dbd65aff)
Fixed and improved error reporting in several edge cases (#9804, #10136, #10163, #10224, #10209)
Fixed some more Windows CLI parameter escaping edge cases

2.1.9 2021-10-05

Security: Fixed command injection vulnerability on Windows (GHSA-frqg-7g38-6gcf / CVE-2021-41116)
Fixed classmap parsing with a new class parser which does not rely on regexes anymore (#10107)
Fixed inline git credentials showing up in output in some conditions (#10115)
Fixed support for running updates while offline as long as the cache contains enough information (#10116)
Fixed show --all foo/bar which as of 2.0.0 was not showing all versions anymore but only the installed one (#10095)
Fixed VCS repos ignoring some versions silently when the API rate limit is reached (#10132)
Fixed CA bundle to remove the expired Let's Encrypt root CA

2.1.8 2021-09-15

Fixed regression in 2.1.7 when parsing classmaps in files containing invalid Unicode (#10102)

2.1.7 2021-09-14

Added many type annotations internally, which may have an effect on CI/static analysis for people using Composer as a dependency. This work will continue in following releases
Fixed regression in 2.1.6 when parsing classmaps with empty heredocs (#10067)
Fixed regression in 2.1.6 where list command was not showing plugin commands (#10075)
Fixed issue handling package updates where the package type changed (#10076)
Fixed docker being detected as WSL when run inside WSL (#10094)

2.1.6 2021-08-19

Updated internal PHAR signatures to be SHA512 instead of SHA1
Fixed uncaught exception handler regression (#10022)
Fixed more PHP 8.1 deprecation warnings (#10036, #10038, #10061)
Fixed corrupted zips in the cache from blocking installs until a cache clear, the bad archives are now deleted automatically on first failure (#10028)
Fixed URL sanitizer handling of new github tokens (#10048)
Fixed issue finding classes with very long heredocs in classmap autoload (#10050)
Fixed proc_open being required for simple installs from zip, as well as diagnose (#9253)
Fixed path repository bug causing symlinks to be left behind after a package is uninstalled (#10023)
Fixed issue in 7-zip support on windows with certain archives (#10058)
Fixed bootstrapping process to avoid loading the composer.json and plugins until necessary, speeding things up slightly (#10064)
Fixed lib-openssl detection on FreeBSD (#10046)
Fixed support for ircs:// protocol for support.irc composer.json entries

2.1.5 2021-07-23

Fixed create-project creating a php: directory in the directory it was executed in (#10020, #10021)
Fixed curl downloader to respect default_socket_timeout if it is bigger than our default 300s (#10018)

2.1.4 2021-07-22

Fixed PHP 8.1 deprecation warnings (#10008)
Fixed support for working within UNC/WSL paths on Windows (#9993)
Fixed 7-zip support to also be looked up on Linux/macOS as 7z or 7zz (#9951)
Fixed repositories' only/exclude properties to avoid matching names as sub-strings of full package names (#10001)
Fixed open_basedir regression from #9855
Fixed schema errors being reported incorrectly in some conditions (#9986)
Fixed archive command not working with async archive extraction
Fixed init command being able to generate an invalid composer.json (#9986)

2.1.3 2021-06-09

Add "symlink" option for "bin-compat" config to force symlinking even on WSL/Windows (#9959)
Fixed source binaries not being made executable when symlinks cannot be used (#9961)
Fixed more deletion edge cases (#9955, #9956)
Fixed dump-autoload command not dispatching scripts anymore, regressed in 2.1.2 (#9954)

2.1.2 2021-06-07

Added --dev to dump-autoload command to allow force-dumping dev autoload rules even if dev requirements are not present (#9946)
Fixed --no-scripts disabling events for plugins too instead of only disabling script handlers, using --no-plugins is the way to disable plugins (#9942)
Fixed handling of deletions during package installs on some filesystems (#9945, #9947)
Fixed undefined array access when using "@php " in a script handler (#9943)
Fixed usage of InstalledVersions when loaded from composer/composer installed as a dependency and runtime Composer is v1 (#9937)

2.1.1 2021-06-04

Fixed regression in autoload generation when --no-scripts is used (#9935)
Fixed outdated color legend to have the right color in the right place (#9939)
Fixed PCRE bug causing a previously valid pattern to fail to match (#9941)
Fixed JsonFile::validateSchema regression when used as a library to validate custom schema files (#9938)

2.1.0 2021-06-03

Fixed PHP 8.1 deprecation warning (#9932)
Fixed env var handling when variables_order includes E and symfony/console 3.3.15+ is in use (#9930)

2.1.0-RC1 2021-06-02

Bumped composer-runtime-api and composer-plugin-api to 2.1.0
UX Change: The default install method for packages is now always dist/zip, even for dev packages, added --prefer-install=auto if you want the old behavior (#9603)
UX Change: Packages from path repositories which are symlinked in the vendor dir will always be updated in partial updates to avoid mistakes when the original composer.json changes but the symlinked package is not explicitly updated (#9765)
Added reinstall command that takes one or more package names, including wildcard (*) support, and removes then reinstalls them in the exact same version they had (#9915)
Added support for parallel package installs on Windows via 7-Zip if it is installed (#9875)
Added detection of invalid composer.lock files that do not fullfil the composer.json requirements to validate command (#9899)
Added InstalledVersions::getInstalledPackagesByType(string $type) to retrieve installed plugins for example, read more (#9699)
Added InstalledVersions::getInstalledPath(string $packageName) to retrieve the install path of a given package, read more (#9699)
Added flag to InstalledVersions::isInstalled() to allow excluding dev requirements from that check (#9682)
Added support for PHP 8.1 enums in autoloader / classmap generation (#9670)
Added support for using @php binary-name foo in scripts to refer to a binary without using its full path, but forcing to use the same PHP version as Composer used (#9726)
Added --format=json support to the fund command (#9678)
Added --format=json support to the search command (#9747)
Added COMPOSER_DEV_MODE env var definition within the run-script command for compatibility (#9793)
Added async uninstall of packages (#9618)
Added color legend to outdated and show --latest commands (#9716)
Added secure-svn-domains config option to mark secure svn:// hostnames and suppress warnings without disabling secure-http (#9872)
Added gitlab-protocol config option to allow forcing git or http URLs for all gitlab repos loaded inline, instead of the default of git for private and http for public (#9401)
Added generation of autoload rules in init command (#9829)
Added source/dist validation in validate command
Added automatic detection of WSL when generating binaries and use bin-compat:full implicitly (#9855)
Added automatic detection of the --no-dev state for dump-autoload based on the last install run (#9714)
Added warning/prompt to require command if requiring a package that already exists in require-dev or vice versa (#9542)
Added information about package conflicts in the why/why-not commands (#9693)
Removed version argument from why command as it was not needed (#9729)
Fixed why-not command to always require a specific version as it is useless without (#9729)
Fixed cache dir on macOS to follow OS guidelines, it is now in ~/Library/Caches/composer (#9898)
Fixed composer.json JSON schema to avoid having name/description required by default (#9912)
Fixed support for running inside WSL paths from a Windows PHP/Composer (#9861)
Fixed InstalledVersions to include the original doc blocks when installed from a Composer phar file
Fixed require command to use * as constraint for extensions bundled with PHP instead of duplicating the PHP constraint (#9483)
Fixed search output to be aligned and avoid wrapped long lines to be more readable (#9455)
Error output improvements for many cases (#9876, #9837, #9928, and some smaller improvements)

2.0.14 2021-05-21

Updated composer/xdebug-handler to 2.0 which adds supports for Xdebug 3
Fixed handling of inline-update-constraints with references or stability flags (#9847)
Fixed async processes erroring in an unclear way when they failed to start (#9808)
Fixed support for the upcoming Symfony 6.0 release when Composer is installed as a library (#9896)
Fixed progress output missing newlines on PowerShell, and disable progress output by default when CI env var is present (#9621)
Fixed support for Vagrant/VirtualBox filesystem slowness when installing binaries from packages (#9627)
Fixed type annotations for the InstalledVersions class
Deprecated InstalledVersions::getRawData in favor of InstalledVersions::getAllRawData (#9816)

2.0.13 2021-04-27

Security: Fixed command injection vulnerability in HgDriver/HgDownloader and hardened other VCS drivers and downloaders (GHSA-h5h8-pc6h-jvvx / CVE-2021-29472)
Fixed install step at the end of the init command to take new dependencies into account correctly
Fixed update --lock listing updates which were not really happening (#9812)
Fixed support for --no-dev combined with --locked in outdated and show commands (#9788)

2.0.12 2021-04-01

Fixed support for new GitHub OAuth token format (#9757)
Fixed support for Vagrant/VirtualBox filesystem slowness by adding short sleeps in some places (#9627)
Fixed unclear error reporting when a package is in the lock file but not in the remote repositories (#9750)
Fixed processes silently ignoring the CWD when it does not exist
Fixed new Windows bin handling to avoid proxying phar files (#9742)
Fixed issue extracting archives into paths that already exist, fixing problems with some custom installers (composer/installers#479)
Fixed support for branch names starting with master/trunk/default (#9739)
Fixed self-update to preserve phar file permissions on Windows (#9733)
Fixed detection of hg version when localized (#9753)
Fixed git execution failures to also include the stdout output (#9720)

2.0.11 2021-02-24

Reverted "Fixed runtime autoloader registration (for plugins and script handlers) to prefer the project dependencies over the bundled Composer ones" as it caused more problems than expected

2.0.10 2021-02-23

Added COMPOSER_MAX_PARALLEL_HTTP to let people set a lower amount of parallel requests if needed
Fixed autoloader registration when plugins are loaded, which may impact plugins relying on this bug (if you use symfony/flex make sure you upgrade it to 1.12.2+ to fix dump-env issues)
Fixed exec command suppressing output in some circumstances
Fixed Windows/cmd.exe support for script handlers defined as path/to/foo, which are now rewritten internally to path\to\foo when needed
Fixed bin handling on Windows for PHP scripts, to more closely match symlinks and allow @php vendor/bin/foo to work cross-platform
Fixed Git for Windows/Git Bash not being detected correctly as an interactive shell (regression since 2.0.7)
Fixed regression handling some private Bitbucket repository clones
Fixed Ctrl-C/SIGINT handling during downloads to correctly abort as soon as possible
Fixed runtime autoloader registration (for plugins and script handlers) to prefer the project dependencies over the bundled Composer ones
Fixed numeric default branches being aliased as 9999999-dev internally. This alias now only applies to default branches being non-numeric (e.g. dev-main)
Fixed support for older lib-sodium versions
Fixed various minor issues

2.0.9 2021-01-27

Added warning if the curl extension is not enabled as it significantly degrades performance
Fixed InstalledVersions to report all packages when several vendor dirs are present in the same runtime
Fixed download speed when downloading large files
Fixed archive and path repo copies mishandling some .gitignore paths
Fixed root package classes not being available to the plugins/scripts during the initial install
Fixed cache writes to be atomic and better support multiple Composer processes running in parallel
Fixed preg jit issues when config or require modifies large composer.json files
Fixed compatibility with envs having open_basedir restrictions
Fixed exclude-from-classmap causing regex issues when having too many paths
Fixed compatibility issue with Symfony 4/5
Several small performance and debug output improvements

2.0.8 2020-12-03

Fixed packages with aliases not matching conflicts which match the alias
Fixed invalid reports of uncommitted changes when using non-default remotes in vendor dir
Fixed curl error handling edge cases
Fixed cached git repositories becoming stale by having a git gc applied to them periodically
Fixed issue initializing plugins when using dev packages
Fixed update --lock / mirrors failing to update in some edge cases
Fixed partial update with --with-dependencies failing in some edge cases with some nonsensical error

2.0.7 2020-11-13

Fixed detection of TTY mode, made input non-interactive automatically if STDIN is not a TTY
Fixed root aliases not being present in lock file if not required by anything else
Fixed remove command requiring a lock file to be present
Fixed Composer\InstalledVersions to always contain up to date data during installation
Fixed status command breaking on slow networks
Fixed order of POST_PACKAGE_* events to occur together once all installations of a package batch are done

2.0.6 2020-11-07

Fixed regression in 2.0.5 dealing with custom installers which do not pass absolute paths

2.0.5 2020-11-06

Disabled platform-check verification of extensions by default (now defaulting php-only), set platform-check to true if you want a complete check
Improved platform-check handling of issue reporting
Fixed platform-check to only check non-dev requires even if require-dev dependencies are installed
Fixed issues dealing with custom installers which return trailing slashes in getInstallPath (ideally avoid doing this as there might be other issues left)
Fixed issues when curl functions are disabled
Fixed gitlab-domains/github-domains to make sure if they are overridden the default value remains present
Fixed issues removing/upgrading packages from path repositories on Windows
Fixed regression in 2.0.4 when handling of git@bitbucket.org URLs in vcs repositories
Fixed issue running create-project in current directory on Windows

2.0.4 2020-10-30

Fixed check-platform-req command not being clear on what packages are checked, and added a --lock flag to explicitly check the locked packages
Fixed config & create-project adding of repositories to make sure they are prepended as order is much more important in Composer 2, also added a --append flag to config to restore the old behavior in the unlikely case this is needed
Fixed curl downloader failing on old PHP releases or when using self-signed SSL certificates
Fixed Bitbucket API authentication issue

2.0.3 2020-10-28

Fixed bug in outdated command where dev packages with branch-aliases where always shown as being outdated
Fixed issue in lock file interoperability with composer 1.x when using dev-master as xxx aliases
Fixed new --locked option being missing from outdated command, for checking outdated packages directly from the lock file
Fixed a few debug/error reporting strings

2.0.2 2020-10-25

Fixed regression handling composer show -s in projects where no version can be guessed from VCS
Fixed regression handling partial updates/require when a lock file was missing
Fixed interop issue with plugins that need to update dist URLs of packages, see docs if you need this

2.0.1 2020-10-24

Fixed crash on PHP 8

2.0.0 2020-10-24

Fixed proxy handling issues when combined with our new curl-based downloader
Fixed solver bug resulting in endless loops in some cases
Fixed solver output being extremely long due to learnt rules
Fixed solver bug with multi literals
Fixed a couple minor regressions

2.0.0-RC2 2020-10-14

Breaking: Removed OperationInterface::getReason as the data was not accurate
Added automatic removal of packages which are not required anymore whenever an update is done, this will purge packages previously left over by partial updates and require/remove
Added shorthand aliases -w for --with-dependencies and -W for --with-all-dependencies on update/require/remove commands
Added COMPOSER_DEBUG_EVENTS=1 env var support for plugin authors to figure out which events are triggered when
Added setCustomCacheKey to PreFileDownloadEvent and fixed a cache bug for integrations changing the processed url of package archives
Added Composer\Util\SyncHelper for plugin authors to deal with async Promises more easily
Added $composer->getLoop()->getHttpDownloader() to get access to the main HttpDownloader instance in plugins
Added a non-zero exit code (2) and warning to remove command when a package to be removed could not be removed
Added --apcu-autoloader-prefix (or --apcu-prefix for dump-autoload command) flag to let people use apcu autoloading in a deterministic output way if that is needed
Fixed version guesser to look at remote branches as well as local ones
Lots of minor bug fixes and improvements

2.0.0-RC1 2020-09-10

Added more advanced filtering to avoid loading all versions of all referenced packages when resolving dependencies, which should reduce memory usage further in some cases
Added support for many new lib-* packages in the platform repository and improved version detection for some ext-* and lib-* packages
Added an --ask flag to create-project command to make Composer prompt for the install dir name, useful for project install instructions
Added support for tar in artifact repositories
Added a cache-read-only config option to make the cache usable in read only mode for containers and such
Added better error reporting for a few more specific cases
Added a new optional available-package-patterns attribute for v2-format Composer repositories, see UPGRADE for details
Fixed more PHP 8 compatibility issues
Lots of minor bug fixes for regressions

2.0.0-alpha3 2020-08-03

Breaking: Zip archives loaded by artifact repositories must now have a composer.json on top level, or a max of one folder on top level of the archive
Added --no-dev support to show and outdated commands to skip dev requirements
Added support for multiple --repository flags being passed into the create-project command, only useful in combination with --add-repository to persist them to composer.json
Added a new optional list API endpoint for v2-format Composer repositories, see UPGRADE for details
Fixed show -a command not listing anything
Fixed solver bug where it ended in a "Reached invalid decision id 0"
Fixed updates of git-installed packages on windows
Lots of minor bug fixes

2.0.0-alpha2 2020-06-24

Added parallel installation of packages (requires OSX/Linux/WSL, and that unzip is present in PATH)
Added optimization of constraints by compiling them to PHP code, which should reduce CPU time of updates
Added handling of Ctrl-C on Windows for PHP 7.4+
Added better support for default branch names other than master
Added --format=summary flag to license command
Fixed issue in platform check when requiring ext-zend-opcache
Fixed inline aliases issues
Fixed git integration issue when signatures are set to be shown by default

2.0.0-alpha1 2020-06-03

Breaking: This is a major release and while we tried to keep things compatible for most users, you might want to have a look at the UPGRADE guides
Many CPU and memory performance improvements
The update command is now much more deterministic as it does not take the already installed packages into account
Package installation now performs all network operations first before doing any changes on disk, to reduce the chances of ending up with a partially updated vendor dir
Partial updates and require/remove are now much faster as they only load the metadata required for the updated packages
Added a platform-check step when vendor/autoload.php gets initialized which checks the current PHP version/extensions match what is expected and fails hard otherwise. Can be disabled with the platform-check config option
Added a Composer\InstalledVersions class which is autoloaded in every project and lets you check which packages/versions are present at runtime
Added a composer-runtime-api virtual package which you can require (as e.g. ^2.0) to ensure things like the InstalledVersions class above are present. It will effectively force people to use Composer 2.x to install your project
Added support for parallel downloads of package metadata and zip files, this requires that the curl extension is present and we thus strongly recommend enabling curl
Added much clearer dependency resolution error reporting for common error cases
Added support for updating to a specific version with partial updates, as well as a --with flag to pass in temporary constraint overrides
Added support for TTY mode on Linux/OSX/WSL so that script handlers now run in interactive mode
Added only, exclude and canonical options to all repositories, see repository priorities for details
Added support for lib-zip platform package
Added pre-operations-exec event to be fired before the packages get installed/upgraded/removed
Added pre-pool-create event to be fired before the package pool for the dependency solver is created, which lets you modify the list of packages going in
Added post-file-download event to be fired after package dist files are downloaded, which lets you do additional checks on the files
Added --locked flag to show command to see the packages from the composer.lock file
Added --unused flag to remove command to make sure any packages which are not needed anymore get removed
Added --dry-run flag to require and remove commands
Added --no-install flag to update, require and remove commands to disable the install step and only do the update step (composer.lock file update)
Added --with-dependencies and --with-all-dependencies flag aliases to require and remove commands for consistency with update
Added more info to vendor/composer/installed.json, a dev key stores whether dev requirements were installed, and every package now has an install-path key with its install location
Added COMPOSER_DISABLE_NETWORK which if set makes Composer do its best to run offline. This can be useful when you have poor connectivity or to do benchmarking without network jitter
Added --json and --merge flags to config command to allow editing complex extra.* values by using json as input
Added confirmation prompt when running Composer as superuser in interactive mode
Added --no-check-version to validate command to remove the warning in case the version is defined
Added --ignore-platform-req (without s) to all commands supporting --ignore-platform-reqs, which accepts a package name so you can ignore only specific platform requirements
Added support for wildcards (*) in classmap autoloader paths
Added support for configuring GitLab deploy tokens in addition to private tokens, see gitlab-token
Added support for package version guessing for require and init command to take all platform packages into account, not just php version
Fixed package ordering when autoloading and especially when loading plugins, to make sure dependencies are loaded before their dependents
Fixed suggest output being very spammy, it now is only one line long and shows more rarely
Fixed conflict rules like e.g. >=5 from matching dev-master, as it is not normalized to 9999999-dev internally anymore

1.10.23 2021-10-05

Security: Fixed command injection vulnerability on Windows (GHSA-frqg-7g38-6gcf / CVE-2021-41116)

1.10.22 2021-04-27

Security: Fixed command injection vulnerability in HgDriver/HgDownloader and hardened other VCS drivers and downloaders (GHSA-h5h8-pc6h-jvvx / CVE-2021-29472)

1.10.21 2021-04-01

Fixed support for new GitHub OAuth token format
Fixed processes silently ignoring the CWD when it does not exist

1.10.20 2021-01-27

Fixed exclude-from-classmap causing regex issues when having too many paths
Fixed compatibility issue with Symfony 4/5

1.10.19 2020-12-04

Fixed regression on PHP 8.0

1.10.18 2020-12-03

Allow installation on PHP 8.0

1.10.17 2020-10-30

Fixed Bitbucket API authentication issue
Fixed parsing of Composer 2 lock files breaking in some rare conditions

1.10.16 2020-10-24

Added warning to validate command for cases where packages provide/replace a package that they also require
Fixed JSON schema validation issue with PHPStorm
Fixed symlink handling in archive command

1.10.15 2020-10-13

Fixed path repo version guessing issue

1.10.14 2020-10-13

Fixed version guesser to look at remote branches as well as local ones
Fixed path repositories version guessing to handle edge cases where version is different from the VCS-guessed version
Fixed COMPOSER env var causing issues when combined with the global command
Fixed a few issues dealing with PHP without openssl extension (not recommended at all but sometimes needed for testing)

1.10.13 2020-09-09

Fixed regressions with old version validation
Fixed invalid root aliases not being reported

1.10.12 2020-09-08

Fixed regressions with old version validation

1.10.11 2020-09-08

Fixed more PHP 8 compatibility issues
Fixed regression in handling of CTRL-C when xdebug is loaded
Fixed status handling of broken symlinks

1.10.10 2020-08-03

Fixed create-project not triggering events while installing the root package
Fixed PHP 8 compatibility issue
Fixed self-update to avoid automatically upgrading to the next major version once it becomes stable

1.10.9 2020-07-16

Fixed Bitbucket redirect loop when credentials are outdated
Fixed GitLab auth prompt wording
Fixed self-update handling of files requiring admin permissions to write to on Windows (it now does a UAC prompt)
Fixed parsing issues in funding.yml files

1.10.8 2020-06-24

Fixed compatibility issue with git being configured to show signatures by default
Fixed discarding of local changes when updating packages to include untracked files
Several minor fixes

1.10.7 2020-06-03

Fixed PHP 8 deprecations
Fixed detection of pcntl_signal being in disabled_functions when pcntl_async_signal is allowed

1.10.6 2020-05-06

Fixed version guessing to take composer-runtime-api and composer-plugin-api requirements into account to avoid selecting packages which require Composer 2
Fixed package name validation to allow several dashes following each other
Fixed post-status-cmd script not firing when there were no changes to be displayed
Fixed composer-runtime-api support on Composer 1.x, the package is now present as 1.0.0
Fixed support for composer show --name-only --self
Fixed detection of GitLab URLs when handling authentication in some cases

1.10.5 2020-04-10

Fixed self-update on PHP <5.6, seriously please upgrade people, it's time
Fixed 1.10.2 regression with PATH resolution in scripts

1.10.4 2020-04-09

Fixed 1.10.2 regression in path symlinking with absolute path repos

1.10.3 2020-04-09

Fixed invalid --2 flag warning in self-update when no channel is requested

1.10.2 2020-04-09

Added --1 flag to self-update command which can be added to automated self-update runs to make sure it won't automatically jump to 2.0 once that is released
Fixed path repository symlinks being made relative when the repo url is defined as absolute paths
Fixed potential issues when using "composer ..." in scripts and composer/composer was also required in the project
Fixed 1.10.0 regression when downloading GitHub archives from non-API URLs
Fixed handling of malformed info in fund command
Fixed Symfony5 compatibility issues in a few commands

1.10.1 2020-03-13

Fixed path repository warning on empty path when using wildcards
Fixed superfluous warnings when generating optimized autoloaders

1.10.0 2020-03-10

Added bearer auth config to authenticate using Authorization: Bearer <token> headers
Added plugin-api-version in composer.lock so third-party tools can know which Composer version was used to generate a lock file
Fixed composer fund command and funding info parsing to be more useful
Fixed issue where --no-dev autoload generation was excluding some packages which should not have been excluded
Fixed 1.10-RC regression in create project's handling of absolute paths

1.10.0-RC 2020-02-14

Breaking: composer global exec ... now executes the process in the current working directory instead of executing it in the global directory.
Warning: Added a warning when class names are being loaded by a PSR-4 or PSR-0 rule only due to classmap optimization, but would not otherwise be autoloadable. Composer 2.0 will stop autoloading these classes so make sure you fix your autoload configs.
Added new funding key to composer.json to describe ways your package's maintenance can be funded. This reads info from GitHub's FUNDING.yml by default so better configure it there so it shows on GitHub and Composer/Packagist
Added composer fund command to show funding info of your dependencies
Added support for --format=json output for show command when showing a single package
Added support for configuring suggestions using config command, e.g. composer config suggest.foo/bar some text
Added support for configuring fine-grained preferred-install using config command, e.g. composer config preferred-install.foo/* dist
Added @putenv script handler to set environment variables from composer.json for following scripts
Added lock option that can be set to false, in which case no composer.lock file will be generated
Added --add-repository flag to create-project command which will persist the repo given in --repository into the composer.json of the package being installed
Added support for IPv6 addresses in NO_PROXY
Added package homepage display in the show command
Added debug info about HTTP authentications
Added Symfony 5 compatibility
Added --fixed flag to require command to make it use a fixed constraint instead of a ^x.y constraint when adding the requirement
Fixed exclude-from-classmap matching subsets of directories e.g. foo/ was excluding foobar/
Fixed archive command to persist file permissions inside the zip files
Fixed init/require command to avoid suggesting packages which are already selected in the search results
Fixed create-project UX issues
Fixed filemtime for vendor/composer/* files is now only changing when the files actually change
Fixed issues detecting docker environment with an active open_basedir

1.9.3 2020-02-04

Fixed GitHub deprecation of access_token query parameter, now using Authorization header

1.9.2 2020-01-14

Fixed minor git driver bugs
Fixed schema validation for version field to allow dev-* versions too
Fixed external processes' output being formatted even though it should not
Fixed issue with path repositories when trying to install feature branches

1.9.1 2019-11-01

Fixed various credential handling issues with gitlab and github
Fixed credentials being present in git remotes in Composer cache and vendor directory when not using SSH keys
Fixed composer why not listing replacers as a reason something is present
Fixed various PHP 7.4 compatibility issues
Fixed root warnings always present in Docker containers, setting COMPOSER_ALLOW_SUPERUSER is not necessary anymore
Fixed GitHub access tokens leaking into debug-verbosity output
Fixed several edge case issues detecting GitHub, Bitbucket and GitLab repository types
Fixed Composer asking if you want to use a composer.json in a parent directory when ran in non-interactive mode
Fixed classmap autoloading issue finding classes located within a few non-PHP context blocks (?>...<?php)

1.9.0 2019-08-02

Breaking: artifact repositories with URLs containing port numbers and requiring authentication now require you to configure http-basic auth for the host:port pair explicitly
Added a --no-cache flag available on all commands to run with the cache disabled
Added PHP_BINARY as env var pointing to the PHP process when executing Composer scripts as shell scripts
Added a use-github-api config option which can set the no-api flag on all GitHub VCS repositories declared
Added a static helper you can preprend to a script to avoid process timeouts, "Composer\\Config::disableProcessTimeout"
Added Event::getOriginatingEvent to retrieve an event's original event when a script handler forwards to another one
Added support for autoloading directly from a phar file
Fixed loading order of plugins to always initialize them in order of dependencies
Fixed various network-mount related issues
Fixed --ignore-platform-reqs not ignoring conflict rules against platform packages

1.8.6 2019-06-11

Fixed handling of backslash-escapes handling in composer.json when using the require command
Fixed create-project not following classmap-authoritative and apcu-autoloader config values
Fixed HHVM version warning showing up in some cases when it was not in use

1.8.5 2019-04-09

HHVM 4.0 is no longer compatible with Composer. Please use PHP instead going forward.
Added forward compatibility with upcoming 2.0 changes
Fixed support for PHP 7.3-style heredoc/nowdoc syntax changes in autoload generation
Fixed require command usage when combined with --ignore-platform-reqs
Fixed and cleaned up various Windows junctions handling issues

1.8.4 2019-02-11

Fixed long standing solver bug leading to odd solving issues in edge cases, see #7946
Fixed HHVM support for upcoming releases
Fixed unix proxy for binaries to be POSIX compatible instead of breaking some shells
Fixed invalid deprecation warning for composer-plugin-api
Fixed edge case issues with Windows junctions when working with path repositories

1.8.3 2019-01-30

Fixed regression when executing partial updates

1.8.2 2019-01-29

Fixed invalid deprecation warning for ext-pdo_mysql and similar
Updated to latest xdebug-handler

1.8.1 2019-01-29

Deprecated support for non-standard package names (anything with uppercase, or no / in it). Make sure to follow the warnings if you see any to avoid problems in 2.0.
Fixed some packages missing from the autoloader config when installing with --no-dev
Fixed support for cloning GitLab repos using OAuth tokens instead of SSH keys
Fixed metapackage installs/updates missing from output
Fixed --with-dependencies / --with-all-dependencies not updating some packages in some edge cases
Fixed compatibility with Symfony 4.2 deprecations
Fixed temp dir not being cleaned up on download error while archiving packages
Updated to latest ca-bundle

1.8.0 2018-12-03

Changed post-package-install / post-package-update event to be fired after the lock file has been updated as opposed to before
Added support for removing packages using a wildcard with the remove command, e.g. composer remove foo/*
Added chat to the list of support channels you can list in composer.json
Added signal handling on require command to restore the composer.json in case of abort
Added --ignore to outdated command to pass one or more packages that you do not want to be listed
Added --no-dev to check-platform-reqs command to skip dev requirements even if they are installed
Added support for running plugin commands from sub-directories within a project much like other Composer commands
Added support for running Composer via phpdbg
Added lib-imagick platform package
Fixed validate command always checking for disabled checks when used with --strict

1.7.3 2018-11-01

Fixed handling of replace/conflict rules. This may affect dependency resolution in some edge cases.
Fixed Bitbucket API support and migrated all calls to API v2 as v1 is deprecated
Fixed support for lib-openssl 1.1.1 having only lowercase algorithm names
Fixed escaping of URLs in Perforce and Svn drivers
Fixed show command not respecting --path when a single package name was given
Fixed regression in 1.7.2's handling of metapackages

1.7.2 2018-08-16

Fixed reporting of authentication/rate limiting issues for GitHub API access
Fixed create-project not checking the checking the latest commit out when a cache was already present
Fixed reporting of errors when global command can not switch the working directory
Fixed PHP 5.3 JSON encoding issues with complex unicode character sequences
Updated to latest ca-bundle and xdebug-handler projects, see related changelogs

1.7.1 2018-08-07

Fixed issue autoloading plugins in require-dev in some conditions
Fixed handling of SSL to repo.packagist.org on very old PHP versions

1.7.0 2018-08-03

Added the overridden platform config's PHP version in the diagnose command output
Fixed --no-plugins not being respected in a few commands
Fixed 1.7.0-RC regression in output showing instead of proper colors
Fixed 1.7.0-RC regression in output missing "Loading from cache" output on package install

1.7.0-RC 2018-07-24

Changed default repository URL from packagist.org to repo.packagist.org, this might affect people with strict firewall rules
Changed output from Updating to Downgrading when performing package downgrades, this might affect anything parsing output
Several minor performance improvements
Added basic authentication support for mercurial repos
Added explicit i and u aliases for the install and update commands
Added support for show command to output json format with --tree
Added support for {glob,braces} support in the path repository's path argument
Added support in status command for showing diffs in vendor dir even for packages installed as dist/zip archives
Added --remove-vcs flag to create-project command to avoid prompting for keeping VCS files
Added --no-secure-http flag to create-project command to bypass https (use at your own risk)
Added pre-command-run event that lets plugins modify arguments
Added RemoteFilesystem::getRemoteContents extension point
Fixed setting scripts via config command

1.6.5 2018-05-04

Fixed regression in 1.6.4 causing strange update behaviors with dev packages
Fixed regression in 1.6.4 color support detection for Windows
Fixed issues dealing with broken symlinks when switching branches and using path repositories
Fixed JSON schema for package repositories
Fixed issues on computers set to Turkish locale
Fixed classmap parsing of files using short-open-tags when they are disabled in php

1.6.4 2018-04-13

Security fixes in some edge case scenarios, recommended update for all users
Fixed regression in version guessing of path repositories
Fixed removing aliased packages from the repository, which might resolve some odd update bugs
Fixed updating of package URLs for GitLab
Fixed run-script --list failing when script handlers were defined
Fixed init command not respecting the current php version when selecting package versions
Fixed handling of uppercase package names in why/why-not commands
Fixed exclude-from-classmap symlink handling
Fixed filesystem permissions of PEAR binaries
Improved performance of subversion repos
Other minor fixes

1.6.3 2018-01-31

Fixed GitLab downloads failing in some edge cases
Fixed ctrl-C handling during create-project
Fixed GitHub VCS repositories not prompting for a token in some conditions
Fixed SPDX license identifiers being case sensitive
Fixed and clarified a few dependency resolution error reporting strings
Fixed SVN commit log fetching in verbose mode when using private repositories

1.6.2 2018-01-05

Fixed more autoloader regressions
Fixed support for updating dist refs in gitlab URLs

1.6.1 2018-01-04

Fixed upgrade regression due to some autoloader cleanups
Fixed some overly loose version constraints

1.6.0 2018-01-04

Added support for SPDX license identifiers v3.0, deprecates GPL/LGPL/AGPL identifiers, which should now have a -only or -or-later suffix added.
Added support for COMPOSER_MEMORY_LIMIT env var to make Composer set the PHP memory limit explicitly
Added support for simple strings for the bin
Fixed check-platform-reqs bug in version checking

1.6.0-RC 2017-12-19

Improved performance of installs and updates from git clones when checking out known commits
Added check-platform-reqs command that checks that your PHP and extensions versions match the platform requirements of the installed packages
Added --with-all-dependencies to the update and require commands which updates all dependencies of the listed packages, including those that are direct root requirements
Added scripts-descriptions key to composer.json to customize the description and document your custom commands
Added support for the uppercase NO_PROXY env var
Added support for COMPOSER_DEFAULT_{AUTHOR,LICENSE,EMAIL,VENDOR} env vars to pre-populate init command values
Added support for local fossil repositories
Added suggestions for alternative spellings when entering packages in init and require commands and nothing can be found
Fixed installed.json data to be sorted alphabetically by package name
Fixed compatibility with Symfony 4.x components that Composer uses

1.5.6 - 2017-12-18

Fixed root package version guessed when a tag is checked out
Fixed support for GitLab repos hosted on non-standard ports
Fixed regression in require command when requiring unstable packages, part 3

1.5.5 - 2017-12-01

Fixed regression in require command when requiring unstable packages, part 2

1.5.4 - 2017-12-01

Fixed regression in require command when requiring unstable packages

1.5.3 - 2017-11-30

Fixed require/remove commands reverting the composer.json change when a non-solver-related error occurs
Fixed GitLabDriver to support installations of GitLab not at the root of the domain
Fixed create-project not following the optimize-autoloader flag of the root package
Fixed Authorization header being forwarded across domains after a redirect
Improved some error messages for clarity

1.5.2 - 2017-09-11

Fixed GitLabDriver looping endlessly in some conditions
Fixed GitLabDriver support for unauthenticated requests
Fixed GitLab zip downloads not triggering credentials prompt if unauthenticated
Fixed path repository support of COMPOSER_ROOT_VERSION, it now applies to all path repos within the same git repository
Fixed path repository handling of copies to avoid copying VCS files and others
Fixed sub-directory call to ignore list and create-project commands as well as calls to Composer using --working-dir
Fixed invalid warning appearing when calling remove on an non-stable package

1.5.1 - 2017-08-09

Fixed regression in GitLabDriver with repos containing >100 branches or tags
Fixed sub-directory call support to respect the COMPOSER env var

1.5.0 - 2017-08-08

Changed the package install order to ensure that plugins are always installed as soon as possible
Added ability to call composer from within sub-directories of a project
Added support for GitLab API v4
Added support for GitLab sub-groups
Added some more rules to composer validate
Added support for reading the USER env when guessing the username in composer init
Added warning when uncompressing files with the same name but difference cases on case insensitive filesystems
Added htaccess-protect option / COMPOSER_HTACCESS_PROTECT env var to disable the .htaccess creation in home dir (defaults to true)
Improved clear-cache command
Minor improvements/fixes and many documentation updates

1.4.3 - 2017-08-06

Fixed GitLab URLs
Fixed root package version detection using latest git versions
Fixed inconsistencies in date format in composer.lock when installing from source
Fixed Mercurial support regression
Fixed exclude-from-classmap not being applied when autoloading files for Composer plugins
Fixed exclude-from-classmap being ignored when cwd has the wrong case on case insensitive filesystems
Fixed several other minor issues

1.4.2 - 2017-05-17

Fixed Bitbucket API handler parsing old deleted branches in hg repos
Fixed regression in gitlab downloads
Fixed output inconsistencies
Fixed unicode handling in init command for author names
Fixed useless warning when doing partial updates/removes on packages that are not currently installed
Fixed Xdebug disabling issue when combined with disable_functions and allow_url_fopen CLI overrides

1.4.1 - 2017-03-10

Fixed apcu-autoloader config option being ignored in dump-autoload command
Fixed json validation not allowing boolean for trunk-path, branches-path and tags-path in svn repos
Fixed json validation not allowing repository URLs without scheme

1.4.0 - 2017-03-08

Improved memory usage of dependency solver
Added --format json option to the outdated and show command to get machine readable package listings
Added --ignore-filters flag to archive command to bypass the .gitignore and co
Added support for outdated output without ansi colors
Added support for Bitbucket API v2
Changed the require command to follow minimum-stability / prefer-stable values when picking a version
Fixed regression when using composer in a Mercurial repository

1.3.3 - 2017-03-08

Capifony users beware: This release has output format tweaks that mess up capifony interactive mode, see #6233
Improved baseline psr-4 autoloader performance for projects with many nested namespaces configured
Fixed issues with gitlab API access when the token had insufficient permissions
Fixed some HHVM strict type issues
Fixed version guessing of headless git checkouts in some conditions
Fixed compatibility with subversion 1.8
Fixed version guessing not working with svn/hg
Fixed script/exec errors not being output correctly
Fixed PEAR repository bug with pear.php.net

1.3.2 - 2017-01-27

Added COMPOSER_BINARY env var that is defined within the scope of a Composer run automatically with the path to the phar file
Fixed create-project ending in a detached HEAD when installing aliased packages
Fixed composer show not returning non-zero exit code when the package does not exist
Fixed @composer handling in scripts when --working-dir is used together with it
Fixed private-GitLab handling of repos with dashes in them

1.3.1 - 2017-01-07

Fixed dist downloads from Bitbucket
Fixed some regressions related to xdebug disabling
Fixed --minor-only flag in outdated command
Fixed handling of config.platform.php which did not replace other php-* package's versions

1.3.0 - 2016-12-24

Fixed handling of annotated git tags vs lightweight tags leading to useless updates sometimes
Fixed ext-xdebug not being require-able anymore due to automatic xdebug disabling
Fixed case insensitivity of remove command

1.3.0-RC - 2016-12-11

Added workaround for xdebug performance impact by restarting PHP without xdebug automatically in case it is enabled
Added --minor-only to the outdated command to only show updates to minor versions and ignore new major versions
Added --apcu-autoloader to the update/install commands and --apcu to dump-autoload to enable an APCu-caching autoloader, which can be more efficient than --classmap-authoritative if you attempt to autoload many classes that do not exist, or if you can not use authoritative classmaps for some reason
Added summary of operations to be executed before they run, and made execution output more compact
Added php-debug and php-zts virtual platform packages
Added gitlab-token auth config for GitLab private tokens
Added --strict to the outdated command to return a non-zero exit code when there are outdated packages
Added ability to call php scripts using the current php interpreter (instead of finding php in PATH by default) in script handlers via @php ...
Added COMPOSER_ALLOW_XDEBUG env var to circumvent the Xdebug-disabling behavior
Added COMPOSER_MIRROR_PATH_REPOS env var to force mirroring of path repositories vs symlinking
Added COMPOSER_DEV_MODE env var that is set by Composer to forward the dev mode to script handlers
Fixed support for git 2.11
Fixed output from zip and rar leaking out when an error occurred
Removed hash from composer.lock, only content-hash is now used which should reduce conflicts
Minor fixes and performance improvements

1.2.4 - 2016-12-06

Fixed regression in output handling of scripts from 1.2.3
Fixed support for LibreSSL detection as lib-openssl
Fixed issue with Zend Guard in the autoloader bootstrapping
Fixed support for loading partial provider repositories

1.2.3 - 2016-12-01

Fixed bug in HgDriver failing to identify BitBucket repositories
Fixed support for loading partial provider repositories

1.2.2 - 2016-11-03

Fixed selection of packages based on stability to be independent from package repository order
Fixed POST_DEPENDENCIES_SOLVING not containing some operations in edge cases
Fixed issue handling GitLab URLs containing dots and other special characters
Fixed issue on Windows when running composer at the root of a drive
Minor fixes

1.2.1 - 2016-09-12

Fixed edge case issues with the static autoloader
Minor fixes

1.2.0 - 2016-07-19

Security: Fixed httpoxy vulnerability
Fixed home command to avoid rogue output on unix
Fixed output of git clones to clearly state when clones are from cache
(from 1.2 RC) Fixed ext-network-ipv6 to be php-ipv6

1.2.0-RC - 2016-07-04

Added caching of git repositories if you have git 2.3+ installed. Repositories will now be cached once and then cloned from local cache so subsequent installs should be faster
Added detection of HEAD changes to the status command. If you git checkout X in a vendor directory for example it will tell you that it is not at the version that was installed
Added a virtual php-ipv6 extension to require PHP compiled with IPv6 support
Added --no-suggest to install and update commands to skip output of suggestions at the end
Added --type to the search command to restrict to a given package type
Added fossil support as alternative to git/svn/.. for package downloads
Improved BitBucket OAuth support
Added support for blocking cache operations using COMPOSER_CACHE_DIR=/dev/null (or NUL on windows)
Added support for using declare(strict_types=1) in plugins
Added --prefer-stable and --prefer-lowest to the require command
Added --no-scripts to the require and remove commands
Added _comment top level key to the schema to endorse using it as a place to store comments (it can be a string or array of strings)
Added support for justinrainbow/json-schema 2.0
Fixed binaries not being re-installed if deleted by users or the bin-dir changes. update and install will now re-install them
Many minor UX and docs improvements

1.1.3 - 2016-06-26

Fixed bitbucket oauth instructions
Fixed version parsing issue
Fixed handling of bad proxies that modify JSON content on the fly

1.1.2 - 2016-05-31

Fixed degraded mode issue when accessing packagist.org
Fixed GitHub access_token being added on subsequent requests in case of redirections
Fixed exclude-from-classmap not working in some circumstances
Fixed openssl warning preventing the use of config command for disabling tls

1.1.1 - 2016-05-17

Fixed regression in handling of #reference which made it update every time
Fixed dev platform requirements being required even in --no-dev install from a lock file
Fixed parsing of extension versions that do not follow valid numbers, we now try to parse x.y.z and ignore the rest
Fixed exact constraints warnings appearing for 0.x versions
Fixed regression in the remove command

1.1.0 - 2016-05-10

Added fallback to SSH for https bitbucket URLs
Added BaseCommand::isProxyCommand that can be overridden to mark a command as being a mere proxy, which helps avoid duplicate warnings etc on composer startup
Fixed archiving generating long paths in zip files on Windows

1.1.0-RC - 2016-04-29

Added ability for plugins to register their own composer commands
Optimized the autoloader initialization using static loading on PHP 5.6 and above, this reduces the load time for large classmaps to almost nothing
Added --latest to show command to show the latest version available of your dependencies
Added --outdated to show command an composer outdated alias for it, to show only packages in need of update
Added --direct to show and outdated commands to show only your direct dependencies in the listing
Added support for editing all top-level properties (name, minimum-stability, ...) as well as extra values via the config command
Added abandoned state warning to the show and outdated commands when listing latest packages
Added support for ~/ and $HOME/ in the path repository paths
Added support for wildcards in the show command package filter, e.g. composer show seld/*
Added ability to call composer itself from scripts via @composer ...
Added untracked files detection to the status command
Added warning to validate command when using exact-version requires
Added warning once per domain when accessing insecure URLs with secure-http disabled
Added a dependency on composer/ca-bundle (extracted CA bundle management to a standalone lib)
Added support for empty directories when archiving to tar
Added an init event for plugins to react to, which occurs right after a Composer instance is fully initialized
Added many new detections of problems in the why-not/prohibits command to figure out why something does not get installed in the expected version
Added a deprecation notice for script event listeners that use legacy script classes
Fixed abandoned state not showing up if you had a package installed before it was marked abandoned
Fixed --no-dev updates creating an incomplete lock file, everything is now always resolved on update
Fixed partial updates in case the vendor dir was not up to date with the lock file

1.0.3 - 2016-04-29

Security: Fixed possible command injection from the env vars into our sudo detection
Fixed interactive authentication with gitlab
Fixed class name replacement in plugins
Fixed classmap generation mistakenly detecting anonymous classes
Fixed auto-detection of stability flags in complex constraints like 2.0-dev || ^1.5
Fixed content-length handling when redirecting to very small responses

1.0.2 - 2016-04-21

Fixed regression in 1.0.1 on systems with mbstring.func_overload enabled
Fixed regression in 1.0.1 that made dev packages update to the latest reference even if not whitelisted in a partial update
Fixed init command ignoring the COMPOSER env var for choosing the json file name
Fixed error reporting bug when the dependency resolution fails
Fixed handling of $ sign in composer config command in some cases it could corrupt the json file

1.0.1 - 2016-04-18

Fixed URL updating when a package's URL changes, composer.lock now contains the right URL including correct reference
Fixed URL updating of the origin git remote as well for packages installed as git clone
Fixed binary .bat files generated from linux being incompatible with windows cmd
Fixed handling of paths with trailing slashes in path repository
Fixed create-project not using platform config when selecting a package
Fixed self-update not showing the channel it uses to perform the update
Fixed file downloads not failing loudly when the content does not match the Content-Length header
Fixed secure-http detecting some malformed URLs as insecure
Updated CA bundle

1.0.0 - 2016-04-05

Added support for bitbucket-oauth configuration
Added warning when running composer as super user, set COMPOSER_ALLOW_SUPERUSER=1 to hide the warning if you really must
Added PluginManager::getGlobalComposer getter to retrieve the global instance (which can be null!)
Fixed dependency solver error reporting in many cases it now shows you proper errors instead of just saying a package does not exist
Fixed output of failed downloads appearing as 100% done instead of Failed
Fixed handling of empty directories when archiving, they are not skipped anymore
Fixed installation of broken plugins corrupting the vendor state when combined with symlinked path repositories

1.0.0-beta2 - 2016-03-27

Break: The install command now turns into an update command automatically if you have no composer.lock. This was done only half-way before which caused inconsistencies
Break: By default the remove command now removes dependencies as well, and --update-with-dependencies is deprecated. Use --no-update-with-dependencies to get old behavior
Added support for update channels in self-update. All users will now update to stable builds by default. Run self-update with --snapshot, --preview or --stable to switch between update channels.
Added support for SSL_CERT_DIR env var and openssl.capath ini value
Added some conflict detection in why-not command
Added suggestion of root package's suggests in create-project command
Fixed create-project ignoring --ignore-platform-reqs when choosing a version of the package
Fixed search command in a directory without composer.json
Fixed path repository handling of symlinks on windows
Fixed PEAR repo handling to prefer HTTPS mirrors over HTTP ones
Fixed handling of Path env var on Windows, only PATH was accepted before
Small error reporting and docs improvements

1.0.0-beta1 - 2016-03-03

Break: By default we now disable any non-secure protocols (http, git, svn). This may lead to issues if you rely on those. See secure-http config option.
Break: show / list command now only show installed packages by default. An --all option is added to show all packages.
Added VCS repo support for the GitLab API, see also gitlab-oauth and gitlab-domains config options
Added prohibits / why-not command to show what blocks an upgrade to a given package:version pair
Added --tree / -t to the show command to see all your installed packages in a tree view
Added --interactive / -i to the update command, which lets you pick packages to update interactively
Added exec command to run binaries while having bin-dir in the PATH for convenience
Added --root-reqs to the update command to update only your direct, first degree dependencies
Added cafile and capath config options to control HTTPS certificate authority
Added pubkey verification of composer.phar when running self-update
Added possibility to configure per-package preferred-install types for more flexibility between prefer-source and prefer-dist
Added unpushed-changes detection when updating dependencies and in the status command
Added COMPOSER_AUTH env var that lets you pass a json configuration like the auth.json file
Added secure-http and disable-tls config options to control HTTPS/HTTP
Added warning when Xdebug is enabled as it reduces performance quite a bit, hide it with COMPOSER_DISABLE_XDEBUG_WARN=1 if you must
Added duplicate key detection when loading composer.json
Added sort-packages config option to force sorting of the requirements when using the require command
Added support for the XDG Base Directory spec on linux
Added XzDownloader for xz file support
Fixed SSL support to fully verify peers in all PHP versions, unsecure HTTP is also disabled by default
Fixed stashing and cleaning up of untracked files when updating packages
Fixed plugins being enabled after installation even when --no-plugins
Many small bug fixes and additions

1.0.0-alpha11 - 2015-11-14

Added config.platform to let you specify what your target environment looks like and make sure you do not inadvertently install dependencies that would break it
Added exclude-from-classmap in the autoload config that lets you ignore sub-paths of classmapped directories, or psr-0/4 directories when building optimized autoloaders
Added path repository type to install/symlink packages from local paths
Added possibility to reference script handlers from within other handlers using @script-name to reduce duplication
Added suggests command to show what packages are suggested, use -v to see more details
Added content-hash inside the composer.lock to restrict the warnings about outdated lock file to some specific changes in the composer.json file
Added archive-format and archive-dir config options to specify default values for the archive command
Added --classmap-authoritative to install, update, require, remove and dump-autoload commands, forcing the optimized classmap to be authoritative
Added -A / --with-dependencies to the validate command to allow validating all your dependencies recursively
Added --strict to the validate command to treat any warning as an error that then returns a non-zero exit code
Added a dependency on composer/semver, which is the externalized lib for all the version constraints parsing and handling
Added support for classmap autoloading to load plugin classes and script handlers
Added bin-compat config option that if set to full will create .bat proxy for binaries even if Composer runs in a linux VM
Added SPDX 2.0 support, and externalized that in a composer/spdx-licenses lib
Added warnings when the classmap autoloader finds duplicate classes
Added --file to the archive command to choose the filename
Added Ctrl+C handling in create-project to cancel the operation cleanly
Fixed version guessing to use ^ always, default to stable versions, and avoid versions that require a higher php version than you have
Fixed the lock file switching back and forth between old and new URL when a package URL is changed and many people run updates
Fixed partial updates updating things they shouldn't when the current vendor dir was out of date with the lock file
Fixed PHAR file creation to be more reproducible and always generate the exact same phar file from a given source
Fixed issue when checking out git branches or tags that are also the name of a file in the repo
Many minor fixes and documentation additions and UX improvements

1.0.0-alpha10 - 2015-04-14

Break: The following event classes are deprecated and you should update your script handlers to use the new ones in type hints:
- Composer\Script\CommandEvent is deprecated, use Composer\Script\Event
- Composer\Script\PackageEvent is deprecated, use Composer\Installer\PackageEvent
Break: Output is now split between stdout and stderr. Any irrelevant output to each command is on stderr as per unix best practices.
Added support for npm-style semver operators (^ and - ranges, = AND, || = OR)
Added --prefer-lowest to update command to allow testing a package with the lowest declared dependencies
Added support for parsing semver build metadata +anything at the end of versions
Added --sort-packages option to require command for sorting dependencies
Added --no-autoloader to install and update commands to skip autoload generation
Added --list to run-script command to see available scripts
Added --absolute to config command to get back absolute paths
Added classmap-authoritative config option, if enabled only the classmap info will be used by the composer autoloader
Added support for branch-alias on numeric branches
Added support for the https_proxy/HTTPS_PROXY env vars used only for https URLs
Added support for using real composer repos as local paths in create-project command
Added --no-dev to licenses command
Added support for PHP 7.0 nightly builds
Fixed detection of stability when parsing multiple constraints
Fixed installs from lock file containing updated composer.json requirement
Fixed the autoloader suffix in vendor/autoload.php changing in every build
Many minor fixes, documentation additions and UX improvements

1.0.0-alpha9 - 2014-12-07

Added remove command to do the reverse of require
Added --ignore-platform-reqs to install/update commands to install even if you are missing a php extension or have an invalid php version
Added a warning when abandoned packages are being installed
Added auto-selection of the version constraint in the require command, which can now be used simply as composer require foo/bar
Added ability to define custom composer commands using scripts
Added browse command to open a browser to the given package's repo URL (or homepage with -H)
Added an autoload-dev section to declare dev-only autoload rules + a --no-dev flag to dump-autoload
Added an auth.json file, with store-auths config option
Added a http-basic config option to store login/pwds to hosts
Added failover to source/dist and vice-versa in case a download method fails
Added --path (-P) flag to the show command to see the install path of packages
Added --update-with-dependencies and --update-no-dev flags to the require command
Added optimize-autoloader config option to force the -o flag from the config
Added clear-cache command
Added a GzipDownloader to download single gzipped files
Added ssh support in the github-protocols config option
Added pre-dependencies-solving and post-dependencies-solving events
Added pre-archive-cmd and post-archive-cmd script events to the archive command
Added a no-api flag to GitHub VCS repos to skip the API but still get zip downloads
Added http-basic auth support for private git repos not on github
Added support for autoloading .hh files when running HHVM
Added support for PHP 5.6
Added support for OTP auth when retrieving a GitHub API key
Fixed isolation of files autoloaded scripts to ensure they can not affect anything
Improved performance of solving dependencies
Improved SVN and Perforce support
A boatload of minor fixes, documentation additions and UX improvements

1.0.0-alpha8 - 2014-01-06

Break: The install command now has --dev enabled by default. --no-dev can be used to install without dev requirements
Added composer-plugin package type to allow extensibility, and deprecated composer-installer
Added psr-4 autoloading support and deprecated target-dir since it is a better alternative
Added --no-plugins flag to replace --no-custom-installers where available
Added global command to operate Composer in a user-global directory
Added licenses command to list the license of all your dependencies
Added pre-status-cmd and post-status-cmd script events to the status command
Added post-root-package-install and post-create-project-cmd script events to the create-project command
Added pre-autoload-dump script event
Added --rollback flag to self-update
Added --no-install flag to create-project to skip installing the dependencies
Added a hhvm platform package to require Facebook's HHVM implementation of PHP
Added github-domains config option to allow using GitHub Enterprise with Composer's GitHub support
Added prepend-autoloader config option to allow appending Composer's autoloader instead of the default prepend behavior
Added Perforce support to the VCS repository
Added a vendor/composer/autoload_files.php file that lists all files being included by the files autoloader
Added support for the no_proxy env var and other proxy support improvements
Added many robustness tweaks to make sure zip downloads work more consistently and corrupted caches are invalidated
Added the release date to composer -V output
Added autoloader-suffix config option to allow overriding the randomly generated autoloader class suffix
Fixed BitBucket API usage
Fixed parsing of inferred stability flags that are more stable than the minimum stability
Fixed installation order of plugins/custom installers
Fixed tilde and wildcard version constraints to be more intuitive regarding stabilities
Fixed handling of target-dir changes when updating packages
Improved performance of the class loader
Improved memory usage and performance of solving dependencies
Tons of minor bug fixes and improvements

1.0.0-alpha7 - 2013-05-04

Break: For forward compatibility, you should change your deployment scripts to run composer install --no-dev. The install command will install dev dependencies by default starting in the next release
Break: The update command now has --dev enabled by default. --no-dev can be used to update without dev requirements, but it will create an incomplete lock file and is discouraged
Break: Removed support for lock files created before 2012-09-15 due to their outdated unusable format
Added prefer-stable flag to pick stable packages over unstable ones when possible
Added preferred-install config option to always enable --prefer-source or --prefer-dist
Added diagnose command to to system/network checks and find common problems
Added wildcard support in the update whitelist, e.g. to update all packages of a vendor do composer update vendor/*
Added archive command to archive the current directory or a given package
Added run-script command to manually trigger scripts
Added proprietary as valid license identifier for non-free code
Added a php-64bit platform package that you can require to force a 64bit php
Added a lib-ICU platform package
Added a new official package type project for project-bootstrapping packages
Added zip/dist local cache to speed up repetitive installations
Added post-autoload-dump script event
Added Event::getDevMode to let script handlers know if dev requirements are being installed
Added discard-changes config option to control the default behavior when updating "dirty" dependencies
Added use-include-path config option to make the autoloader look for files in the include path too
Added cache-ttl, cache-files-ttl and cache-files-maxsize config option
Added cache-dir, cache-files-dir, cache-repo-dir and cache-vcs-dir config option
Added support for using http(s) authentication to non-github repos
Added support for using multiple autoloaders at once (e.g. PHPUnit + application both using Composer autoloader)
Added support for .inc files for classmap autoloading (legacy support, do not do this on new projects!)
Added support for version constraints in show command, e.g. composer show monolog/monolog 1.4.*
Added support for svn repositories containing packages in a deeper path (see package-path option)
Added an artifact repository to scan a directory containing zipped packages
Added --no-dev flag to install and update commands
Added --stability (-s) flag to create-project to lower the required stability
Added --no-progress to install and update to hide the progress indicators
Added --available (-a) flag to the show command to display only available packages
Added --name-only (-N) flag to the show command to show only package names (one per line, no formatting)
Added --optimize-autoloader (-o) flag to optimize the autoloader from the install and update commands
Added -vv and -vvv flags to get more verbose output, can be useful to debug some issues
Added COMPOSER_NO_INTERACTION env var to do the equivalent of --no-interaction (should be set on build boxes, CI, PaaS)
Added PHP 5.2 compatibility to the autoloader configuration files so they can be used to configure another autoloader
Fixed handling of platform requirements of the root package when installing from lock
Fixed handling of require-dev dependencies
Fixed handling of unstable packages that should be downgraded to stable packages when updating to new version constraints
Fixed parsing of the ~ operator combined with unstable versions
Fixed the require command corrupting the json if the new requirement was invalid
Fixed support of aliases used together with <version>#<reference> constraints
Improved output of dependency solver problems by grouping versions of a package together
Improved performance of classmap generation
Improved mercurial support in various places
Improved lock file format to minimize unnecessary diffs
Improved the config command to support all options
Improved the coverage of the validate command
Tons of minor bug fixes and improvements

1.0.0-alpha6 - 2012-10-23

Schema: Added ability to pass additional options to repositories (i.e. ssh keys/client certificates to secure private repos)
Schema: Added a new ~ operator that should be preferred over >=, see https://getcomposer.org/doc/01-basic-usage.md#package-versions
Schema: Version constraints <x.y are assumed to be <x.y-dev unless specified as <x.y-stable to reduce confusion
Added config command to edit/list config values, including --global switch for system config
Added OAuth token support for the GitHub API
Added ability to specify CLI commands as scripts in addition to PHP callbacks
Added --prefer-dist flag to force installs of dev packages from zip archives instead of clones
Added --working-dir (-d) flag to change the working directory
Added --profile flag to all commands to display execution time and memory usage
Added github-protocols config key to define the order of preferred protocols for github.com clones
Added ability to interactively reset changes to vendor dirs while updating
Added support for hg bookmarks in the hg driver
Added support for svn repositories not following the standard trunk/branch/tags scheme
Fixed git clones of dev versions so that you end up on a branch and not in detached HEAD
Fixed "Package not installed" issues with --dev installs
Fixed the lock file format to be a snapshot of all the package info at the time of update
Fixed order of autoload requires to follow package dependencies
Fixed rename() failures with "Access denied" on windows
Improved memory usage to be more reasonable and not grow with the repository size
Improved performance and memory usage of installs from composer.lock
Improved performance of a few essential code paths
Many bug small fixes and docs improvements

1.0.0-alpha5 - 2012-08-18

Added dump-autoload command to only regenerate the autoloader
Added --optimize to dump-autoload to generate a more performant classmap-based autoloader for production
Added status command to show if any source-installed dependency has local changes, use --verbose to see changed files
Added --verbose flag to install and update that shows the new commits when updating source-installed dependencies
Added --no-update flag to require to only modify the composer.json file but skip the update
Added --no-custom-installers and --no-scripts to install, update and create-project to prevent all automatic code execution
Added support for installing archives that contain only a single file
Fixed APC related issues in the autoload script on high load websites
Fixed installation of branches containing capital letters
Fixed installation of custom dev versions/branches
Improved the coverage of the validate command
Improved PEAR scripts/binaries support
Improved and fixed the output of various commands
Improved error reporting on network failures and some other edge cases
Various minor bug fixes and docs improvements

1.0.0-alpha4 - 2012-07-04

Break: The default minimum-stability is now stable, read more
Break: Custom installers now receive the IO instance and a Composer instance in their constructor
Schema: Added references for dev versions, requiring dev-master#abcdef for example will force the abcdef commit
Schema: Added support key with some more metadata (email, issues, forum, wiki, irc, source)
Schema: Added != operator for version constraints in require/require-dev
Added a recommendation for package names to be lower-cased/with-dashes, it will be enforced for new packages on Pacakgist
Added require command to add a package to your requirements and install it
Added a whitelist to update. Calling composer update foo/bar foo/baz allows you to update only those packages
Added support for overriding repositories in the system config (define repositories in ~/.composer/config.json)
Added lib-* packages to the platform repository, e.g. lib-pcre contains the pcre version
Added caching of GitHub metadata (faster startup time with custom GitHub VCS repos)
Added caching of SVN metadata (faster startup time with custom SVN VCS repos)
Added support for file:// URLs to GitDriver
Added --self flag to the show command to display the infos of the root package
Added --dev flag to create-project command
Added --no-scripts to install and update commands to avoid triggering the scripts
Added COMPOSER_ROOT_VERSION env var to specify the version of the root package (fixes some edge cases)
Added support for multiple custom installers in one package
Added files autoloading method which requires files on every request, e.g. to load functional code
Added automatic recovery for lock files that contain references to rewritten (force pushed) commits
Improved PEAR repositories support and package.xml extraction
Improved and fixed the output of various commands
Fixed the order of installation of requirements (they are always installed before the packages requiring them)
Cleaned up / refactored the dependency solver code as well as the output for unsolvable requirements
Various bug fixes and docs improvements

1.0.0-alpha3 - 2012-05-13

Schema: Added require-dev for development-time requirements (tests, etc), install with --dev
Schema: Added author.role to list the author's role in the project
Schema: Added minimum-stability + @<stability> flags in require for restricting packages to a certain stability
Schema: Removed recommend
Schema: suggest is now informational and can use any description for a package, not only a constraint
Break: vendor/.composer/autoload.php has been moved to vendor/autoload.php, other files are now in vendor/composer/
Added caching of repository metadata (faster startup times & failover if packagist is down)
Added removal of packages that are not needed anymore
Added include_path support for legacy projects that are full of require_once statements
Added installation notifications API to allow better statistics on Composer repositories
Added support for proxies that require authentication
Added support for private github repositories over https
Added autoloading support for root packages that use target-dir
Added awareness of the root package presence and support for it's provide/replace/conflict keys
Added IOInterface::isDecorated to test for colored output support
Added validation of licenses based on the SPDX registry
Improved repository protocol to have large cacheable parts
Fixed various bugs relating to package aliasing, proxy configuration, binaries
Various bug fixes and docs improvements

1.0.0-alpha2 - 2012-04-03

Added create-project command to install a project from scratch with composer
Added automated classmap autoloading support for non-PSR-0 compliant projects
Added human readable error reporting when deps can not be solved
Added support for private GitHub and SVN repositories (use --no-interaction for CI)
Added "file" downloader type to download plain files
Added support for authentication with svn repositories
Added autoload support for PEAR repositories
Improved clones from GitHub which now automatically select between git/https/http protocols
Improved validate command to give more feedback
Improved the search & show commands output
Removed dependency on filter_var
Various robustness & error handling improvements, docs fixes and more bug fixes

1.0.0-alpha1 - 2012-03-01

Initial release

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