build: add make-check step to check and generate ".gitlab-ci.yml"

Makefile.am

@@ -5013,6 +5013,11 @@ EXTRA_DIST += \
 	clients/tests/test-client.check-on-disk/test_004.expected \
 	$(NULL)
 
+check-local-gitlab-ci:
+	"$(srcdir)/tools/check-gitlab-ci.sh" "$(srcdir)"
+
+check_local += check-local-gitlab-ci
+
 ###############################################################################
 # data
 ###############################################################################
@@ -5302,6 +5307,7 @@ EXTRA_DIST += \
 	tools/check-docs.sh \
 	tools/check-exports.sh \
 	tools/check-compare-generated.sh \
+	tools/check-gitlab-ci.sh \
 	tools/create-exports-NetworkManager.sh \
 	tools/debug-helper.py \
 	tools/meson-post-install.sh \

meson.build

@@ -803,6 +803,12 @@ else
   endif
 endif
 
+test(
+  'check-local-gitlab-ci',
+  find_program(join_paths(source_root, 'tools', 'check-gitlab-ci.sh')),
+  args: [source_root],
+)
+
 # Tests, utilities and documentation
 tests = get_option('tests')
 enable_tests = (tests != 'no')

tools/check-gitlab-ci.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+set -e
+
+if [ $# -eq 0 ] ; then
+    BASEDIR="$(dirname "$(readlink -f "$0")")/.."
+elif [ $# -eq 1 ] ; then
+    BASEDIR="$1"
+else
+    echo "invalid arguments"
+    exit 1
+fi
+
+cd "$BASEDIR"
+
+if ! [ -f ./.gitlab-ci.yml ] ; then
+    # we have no gitlab-ci. Probably this is not a git-checkout
+    # but a dist'ed source-tree. Nothing to check.
+    exit 0
+fi
+
+if ! ci-fairy --help 2>&1 >/dev/null ; then
+    # ci-fairy not available. Cannot check.
+    exit 0
+fi
+
+
+if [ "$NM_TEST_REGENERATE" == 1 ] ; then
+    ci-fairy generate-template
+    exit 0
+fi
+
+diff "./.gitlab-ci.yml" <(ci-fairy generate-template -o /dev/stdout)