gitlab-ci: automatically hash build scripts into tag for ci-templates container

ci-templates builds and caches the test containers. When the build
scripts, the ci-template or "config.yml" changes, we need to bump
the tag so that the containers get rebuild.

Partly automate this. The tag now gets generated by the template and
contains a checksum of certain build files. Thus, if you change
any build files, then `ci-fairy generate-template` would generate a
different tag. You can not miss that, because we have tests that ensure
that our ".gitlab-ci.yml" is up to date. Also, you no longer need to
manually bump the tag when a build script changes, just regenerate
".gitlab-ci.yml" with `ci-fairy generate-template`.

See also: https://gitlab.freedesktop.org/freedesktop/ci-templates/-/merge_requests/54

1 files changed, 7 insertions, 2 deletions

diff --git a/.gitlab-ci/ci.template b/.gitlab-ci/ci.template
index 7208aac299..229ba16d81 100644
--- a/.gitlab-ci/ci.template
+++ b/.gitlab-ci/ci.template
@@ -9,7 +9,7 @@
 ########################################
 
 
-.templates_sha: &template_sha d303fafa66bbca44cc5bdb337d5773b5f019b70d # see https://docs.gitlab.com/ee/ci/yaml/#includefile
+.templates_sha: &template_sha 766e3d77c647e404b349e398427e8965a1769b64 # see https://docs.gitlab.com/ee/ci/yaml/#includefile
 
 include:
 {% for distro in distributions|sort(attribute="name") %}
@@ -34,7 +34,12 @@ variables:
   # Note: these tags have no meaning and are not tied to a particular
   # libinput version
 {% for distro in distributions %}
-  {{"%-13s"| format(distro.name.upper() + '_TAG:')}}'{{distro.tag}}'
+  {{"%-13s"| format(distro.name.upper() + '_TAG:')}}'{{distro.tag}}-{{
+    (ci_fairy.hashfiles('./.gitlab-ci/config.yml',
+                        './.gitlab-ci/ci.template',
+                        './.gitlab-ci/' + distro.name + '-install.sh',
+                        './contrib/' + distro.base_type + '/REQUIRED_PACKAGES'))[0:12]
+  }}'
 {% endfor %}
 
 {% for distro in distributions %}