contrib: rework update-modules to fix race cond.

Previously, the modules file was read and written to at the same time (if
there were updates). This change works around this by reworking the file
parsing.

Notable changes
- only update the modules that are in GLUON_SITE_FEEDS
- avoid SIGPIPE by listing only the commit for the target branch

contrib/actions/update-modules.sh

@@ -1,30 +1,39 @@
 #!/bin/bash
+set -eEu
+set -o pipefail
 
-# Die Datei, die die Repository-Informationen enthaelt
+# file that contains the module information
 MODULES_FILE="modules"
 
-# Durchlaufe die Datei, um alle Repository-URLs und ihre entsprechenden Commit-Variablen zu finden
-# shellcheck disable=SC2094    
-while IFS= read -r line; do
-    # Überprüfe, ob die Zeile eine Repository-URL ist
-    if [[ "$line" == "PACKAGES_"*"_REPO="* ]]; then
-        # Extrahiere den Repository-Namen und die URL
-        REPO_NAME=$(echo "$line" | cut -d '=' -f 1)
-        REPO_URL=$(echo "$line" | cut -d '=' -f 2-)
-
-        # Den neuesten Commit für das Repository abrufen
-        NEW_COMMIT=$(git ls-remote "$REPO_URL" | grep -oE '[0-9a-f]{40}' | head -n1)
-
-        # Überprüfen, ob ein neuer Commit gefunden wurde
-        if [ -n "$NEW_COMMIT" ]; then
-            # Den Wert des Commits in der Datei aktualisieren
-            # shellcheck disable=SC2094
-            COMMIT_LINE=$(grep -n "${REPO_NAME/_REPO/_COMMIT}" "$MODULES_FILE" | cut -d ':' -f 1)
-            # shellcheck disable=SC2094
-            sed -i "${COMMIT_LINE}s/.*/${REPO_NAME/_REPO/_COMMIT}=$NEW_COMMIT/" "$MODULES_FILE"
-            echo "Der Wert von ${REPO_NAME/_REPO/_COMMIT} wurde auf den neuesten Commit ($NEW_COMMIT) aktualisiert."
-        else
-            echo "Fehler: Der neueste Commit f  r $REPO_NAME konnte nicht abgerufen werden."
-        fi
+if ((BASH_VERSINFO[0] < 4)); then
+    echo "This script requires Bash 4.0 or above."
+    exit 1
+fi
+
+function get_value_from_line() {
+    cat | cut -d '=' -f 2
+}
+
+function get_all_repo_names() {
+    local file=$1
+    grep "^GLUON_SITE_FEEDS" "${file}" | get_value_from_line | tr -d "'"
+}
+
+for repo in $(get_all_repo_names "${MODULES_FILE}"); do
+    REPO_URL=$(grep "^PACKAGES_${repo^^}_REPO" "${MODULES_FILE}" | get_value_from_line)
+    REPO_COMMIT=$(grep "^PACKAGES_${repo^^}_COMMIT" "${MODULES_FILE}" | get_value_from_line)
+    REPO_BRANCH=$(grep "^PACKAGES_${repo^^}_BRANCH" "${MODULES_FILE}" | get_value_from_line)
+
+    # Get newest commit of the repo
+    NEW_COMMIT=$(git ls-remote --heads "${REPO_URL}" "${REPO_BRANCH}" | grep -oE '[0-9a-f]{40}')
+
+    # Check if the commit has changed
+    if [[ "${REPO_COMMIT}" == "${NEW_COMMIT}" ]]; then
+        echo "No updates for ${repo} repository"
+        continue
     fi
-done < "$MODULES_FILE"
+
+    # Update the value of the commit
+    sed -i "s/${REPO_COMMIT}/${NEW_COMMIT}/" "${MODULES_FILE}"
+    echo "Updated commit of ${repo} (${REPO_COMMIT}) to the newest commit (${NEW_COMMIT})."
+done