Auto-scrape Composer version from upstream composer.lock files

Author: tianon

Dockerfile.template

@@ -83,7 +83,7 @@ RUN { \
 	} > /usr/local/etc/php/conf.d/opcache-recommended.ini
 
 {{ if env.version | startswith("7") then "" else ( -}}
-COPY --from=composer:{{ .composerVersion }} /usr/bin/composer /usr/local/bin/
+COPY --from=composer:{{ .composer.version }} /usr/bin/composer /usr/local/bin/
 
 {{ ) end -}}
 # https://www.drupal.org/node/3060/release

versions.json

@@ -12,7 +12,9 @@
     "version": "7.78"
   },
   "8.9": {
-    "composerVersion": "1.10",
+    "composer": {
+      "version": "1.10"
+    },
     "md5": "75f7a83b14a1e4ec13ca9827f71ccd1c",
     "phpVersions": [
       "7.4"
@@ -25,7 +27,9 @@
     "version": "8.9.13"
   },
   "9.0": {
-    "composerVersion": "1.10",
+    "composer": {
+      "version": "1.10"
+    },
     "phpVersions": [
       "7.4"
     ],
@@ -37,7 +41,9 @@
     "version": "9.0.11"
   },
   "9.1": {
-    "composerVersion": "2.0",
+    "composer": {
+      "version": "2.0"
+    },
     "phpVersions": [
       "8.0",
       "7.4"

versions.sh

@@ -12,12 +12,6 @@ else
 fi
 versions=( "${versions[@]%/}" )
 
-declare -A composerVersions=(
-	[8.9]='1.10' # https://github.com/drupal/drupal/blob/8.9.12/composer.lock#L4357-L4358
-	[9.0]='1.10' # https://github.com/drupal/drupal/blob/9.0.10/composer.lock#L4448-L4449
-	[9.1]='2.0' # https://github.com/drupal/drupal/blob/9.1.2/composer.lock#L4730-L4731
-)
-
 for version in "${versions[@]}"; do
 	export version
 
@@ -66,14 +60,27 @@ for version in "${versions[@]}"; do
 		doc="$(jq <<<"$doc" -c '.md5 = env.md5')"
 	fi
 
-	echo "$version: $fullVersion"
-
-	composerVersion="${composerVersions[$version]:-}"
+	composerVersion="$(
+		wget -qO- "https://github.com/drupal/drupal/raw/$fullVersion/composer.lock" \
+			| jq -r '
+				(.packages, ."packages-dev")[]
+				| select(.name == "composer/composer")
+				| .version
+				| split(".")[0:2] | join(".")
+			' \
+			|| :
+	)"
+	if [ "$version" != '7' ] && [ -z "$composerVersion" ]; then
+		echo >&2 "error: cannot find composer version for '$version' ('$fullVersion')"
+		exit 1
+	fi
 	if [ -n "$composerVersion" ]; then
 		export composerVersion
-		doc="$(jq <<<"$doc" -c '.composerVersion = env.composerVersion')"
+		doc="$(jq <<<"$doc" -c '.composer = { version: env.composerVersion }')"
 	fi
 
+	echo "$version: $fullVersion${composerVersion:+ (composer $composerVersion)}"
+
 	export fullVersion
 	json="$(
 		jq <<<"$json" -c --argjson doc "$doc" '