diff --git a/doc/04-schema.md b/doc/04-schema.md
index 28d0b4ecd..ee61c14c5 100644
--- a/doc/04-schema.md
+++ b/doc/04-schema.md
@@ -442,9 +442,15 @@ that exact version, and not any other version, which would be incorrect.
 #### provide
 
 List of other packages that are provided by this package. This is mostly
-useful for common interfaces. A package could depend on some virtual
-`logger` package, any library that implements this logger interface would
-simply list it in `provide`.
+useful for implementations of common interfaces. A package could depend on
+some virtual `logger-implementation` package, any library that implements
+this logger interface would simply list it in `provide`.
+Using `provide` with the name of an actual package rather than a virtual one
+implies that the code of that package is also shipped, in which case `replace`
+is generally a better choice. A common convention for packages providing an
+interface and relying on other packages to provide an implementation (for
+instance the PSR interfaces) is to use a `-implementation` suffix for the
+name of the virtual package corresponding to the interface package.
 
 #### suggest
 
diff --git a/src/Composer/Command/SelfUpdateCommand.php b/src/Composer/Command/SelfUpdateCommand.php
index e6d4ed4eb..712ccd14f 100644
--- a/src/Composer/Command/SelfUpdateCommand.php
+++ b/src/Composer/Command/SelfUpdateCommand.php
@@ -176,8 +176,19 @@ EOT
             return 1;
         }
 
+        $channelString = $versionsUtil->getChannel();
+        if (is_numeric($channelString)) {
+            $channelString .= '.x';
+        }
+
         if (Composer::VERSION === $updateVersion) {
-            $io->writeError(sprintf('<info>You are already using composer version %s (%s channel).</info>', $updateVersion, $versionsUtil->getChannel()));
+            $io->writeError(
+                sprintf(
+                    '<info>You are already using composer version %s (%s channel).</info>',
+                    $updateVersion,
+                    $channelString
+                )
+            );
 
             // remove all backups except for the most recent, if any
             if ($input->getOption('clean-backups')) {
@@ -198,7 +209,7 @@ EOT
 
         $updatingToTag = !preg_match('{^[0-9a-f]{40}$}', $updateVersion);
 
-        $io->write(sprintf("Upgrading to version <info>%s</info> (%s channel).", $updateVersion, $versionsUtil->getChannel()));
+        $io->write(sprintf("Upgrading to version <info>%s</info> (%s channel).", $updateVersion, $channelString));
         $remoteFilename = $baseUrl . ($updatingToTag ? "/download/{$updateVersion}/composer.phar" : '/composer.phar');
         $signature = $httpDownloader->get($remoteFilename.'.sig')->getBody();
         $io->writeError('   ', false);
diff --git a/src/Composer/Package/Archiver/ArchivableFilesFinder.php b/src/Composer/Package/Archiver/ArchivableFilesFinder.php
index 150e5f48e..4a8042abe 100644
--- a/src/Composer/Package/Archiver/ArchivableFilesFinder.php
+++ b/src/Composer/Package/Archiver/ArchivableFilesFinder.php
@@ -43,7 +43,7 @@ class ArchivableFilesFinder extends \FilterIterator
     {
         $fs = new Filesystem();
 
-        $sources = $fs->normalizePath($sources);
+        $sources = $fs->normalizePath(realpath($sources));
 
         if ($ignoreFilters) {
             $filters = array();
@@ -58,7 +58,7 @@ class ArchivableFilesFinder extends \FilterIterator
         $this->finder = new Finder();
 
         $filter = function (\SplFileInfo $file) use ($sources, $filters, $fs) {
-            if ($file->isLink() && strpos($file->getLinkTarget(), $sources) !== 0) {
+            if ($file->isLink() && strpos($file->getRealPath(), $sources) !== 0) {
                 return false;
             }