Generalize checking APT/APK package versions

install-php-extensions

@@ -647,6 +647,52 @@ installRequiredPackages () {
 	esac
 }
 
+# Get the version of an installed APT/APK package
+#
+# Arguments:
+#   $1: the name of the installed package
+#
+# Output:
+#   The numeric part of the package version, with from 1 to 3 numbers
+#
+# Example:
+#   1
+#   1.2
+#   1.2.3
+getInstalledPackageVersion() {
+	case "$(getDistro)" in
+		alpine)
+			apk info "$1" | head -n1 | cut -c $(( ${#1} + 2 ))- | grep -o -E '^[0-9]+(\.[0-9]+){0,2}'
+			;;
+		debian)
+			dpkg-query --showformat='${Version}' --show "$1" 2>/dev/null | grep -o -E '^[0-9]+(\.[0-9]+){0,2}'
+			;;
+	esac
+}
+
+# Compare two versions
+#
+# Arguments:
+#   $1: the first version
+#   $2: the second version
+#
+# Output
+#  -1 if $1 is less than $2
+#  0 if $1 is the same as $2
+#  1 if $1 is greater than $2
+compareVersions() {
+	compareVersions_v1="$1.0.0"
+	compareVersions_v2="$2.0.0"
+	compareVersions_vMin="$(printf '%s\n%s' "${compareVersions_v1}" "${compareVersions_v2}" | sort -t '.' -n -k1,1 -k2,2 -k3,3 | head -n 1)"
+	if test "$compareVersions_vMin" != "$compareVersions_v1"; then
+		echo '1'
+	elif test "$compareVersions_vMin" = "$compareVersions_v2"; then
+		echo '0'
+	else
+		echo '-1'
+	fi
+}
+
 # Install a bundled PHP module given its handle
 #
 # Arguments:
@@ -902,20 +948,23 @@ installPECLModule () {
 			fi
 			;;
 		rdkafka)
+			installPECLModule_tmp=
 			case "$(getDistro)" in
 				alpine)
-					# lowest version on alpine is 0.9
-					if test ! -z "$(apk search librdkafka | grep -E '^librdkafka-0.9')"; then
-						installPECLModule_actual="$2-3.1.3"
-					fi
+					installPECLModule_tmp='librdkafka'
 					;;
 				debian)
-					# lowest version on debian is 0.8 (jessie), 0.9 (stretch)
-					if test ! -z "$(apt-cache show librdkafka++1 | grep -E -e '^Version: 0.9' -e '^Version: 0.8')"; then
-						installPECLModule_actual="$2-3.1.3"
-					fi
+					installPECLModule_tmp='librdkafka++1'
 					;;
 			esac
+			if test -n "$installPECLModule_tmp"; then
+				installPECLModule_tmp="$(getInstalledPackageVersion "$installPECLModule_tmp")"
+				if test -n "$installPECLModule_tmp"; then
+					if test $(compareVersions "$installPECLModule_tmp" '0.11.0') -lt 0; then
+						installPECLModule_actual="$2-3.1.3"
+					fi
+				fi
+			fi
 			;;
 		redis)
 			if test $1 -le 506; then