gitlab-ci: extract base_type for distros to reduce redundant information

The distro.name is not just a pretty name, its the name under which we fetch
the container. It is thus a well-known name, that we can rely on.

The "base_type" only depends on the distro name, and it makes no sense
to ever choose a different name. Tracking it in the "distributions"
array is thus redundant.

Move the mapping of distro.name to the base type to a separate place.

.gitlab-ci.yml

@@ -57,11 +57,11 @@ variables:
   #
   # This is done by running `ci-fairy generate-template` and possibly bumping
   # ".default_tag".
-  ALPINE_TAG:  'tag-0a615b61395f'
-  CENTOS_TAG:  'tag-87fa88557da7'
-  DEBIAN_TAG:  'tag-2edf40356382'
-  FEDORA_TAG:  'tag-87fa88557da7'
-  UBUNTU_TAG:  'tag-2edf40356382'
+  ALPINE_TAG:  'tag-93cf50e3b143'
+  CENTOS_TAG:  'tag-43e358544423'
+  DEBIAN_TAG:  'tag-08e17e4980fb'
+  FEDORA_TAG:  'tag-43e358544423'
+  UBUNTU_TAG:  'tag-08e17e4980fb'
 
   ALPINE_EXEC: 'bash .gitlab-ci/alpine-install.sh'
   CENTOS_EXEC: 'bash .gitlab-ci/fedora-install.sh'

.gitlab-ci/ci.template

@@ -17,10 +17,10 @@
 
 .templates_sha: &template_sha ffe4d1b10aab7534489f0c4bbc4c5899df17d3f2 # see https://docs.gitlab.com/ee/ci/yaml/#includefile
 
-{# Group distros by their common (name,base_type) tuples.#}
+{# Group distros by their common (name,) tuples.#}
 {% set distro_groups = [] %}
 {% for distro in distributions %}
-  {% set g = {'name':distro.name,'base_type':distro.base_type} %}
+  {% set g = {'name':distro.name} %}
   {% if g not in distro_groups %}
   {%   do distro_groups.append(g) %}
   {% endif %}
@@ -65,13 +65,13 @@ variables:
   {{"%-13s"| format(distro_group.name.upper() + '_TAG:')}}'tag-{{
     (ci_fairy.hashfiles('./.gitlab-ci/config.yml',
                         './.gitlab-ci/ci.template',
-                        './.gitlab-ci/' + distro_group.base_type + '-install.sh',
-                        './contrib/' + distro_group.base_type + '/REQUIRED_PACKAGES'))[0:12]
+                        './.gitlab-ci/' + base_types[distro_group.name] + '-install.sh',
+                        './contrib/' + base_types[distro_group.name] + '/REQUIRED_PACKAGES'))[0:12]
   }}'
 {% endfor %}
 
 {% for distro_group in distro_groups|sort(attribute='name') %}
-  {{"%-13s"| format(distro_group.name.upper() + '_EXEC:')}}'bash .gitlab-ci/{{distro_group.base_type}}-install.sh'
+  {{"%-13s"| format(distro_group.name.upper() + '_EXEC:')}}'bash .gitlab-ci/{{base_types[distro_group.name]}}-install.sh'
 {% endfor %}
 
 .nm_artifacts:

.gitlab-ci/config.yml

@@ -7,22 +7,28 @@
 # https://gitlab.freedesktop.org/freedesktop/ci-templates
 #
 
+# Some distros are fairly similar, and we reuse similar scripts.
+# The base type maps the distro name to their base.
+base_types:
+  fedora: fedora
+  centos: fedora
+  debian: debian
+  ubuntu: debian
+  alpine: alpine
+
 # The list of all distributions we want to create job for.
 distributions:
   - name: fedora
-    base_type: fedora
     # The first tier:1 in the list is used to build the pages and check-{tree,patch}
     tier: 1
     versions:
       - '37'
   - name: fedora
-    base_type: fedora
     tier: 2
     versions:
       - '36'
       - '38'
   - name: fedora
-    base_type: fedora
     tier: 3
     versions:
       - '30'
@@ -32,7 +38,6 @@ distributions:
       - '34'
       - '35'
   - name: ubuntu
-    base_type: debian
     tier: 2
     versions:
       - '18.04'
@@ -41,20 +46,17 @@ distributions:
       - 'devel'
       - 'rolling'
   - name: debian
-    base_type: debian
     tier: 2
     versions:
       - '10'
       - '11'
       - 'sid'
   - name: debian
-    base_type: debian
     tier: 3
     versions:
       - '9'
       - 'testing'
   - name: centos
-    base_type: fedora
     tier: 2
     versions:
       - '7.5.1804'
@@ -62,7 +64,6 @@ distributions:
       - '8.1.1911'
       - '8.3.2011'
   - name: centos
-    base_type: fedora
     tier: 3
     versions:
       - '7.6.1810'
@@ -70,7 +71,6 @@ distributions:
       - '7.8.2003'
       - '8.2.2004'
   - name: alpine
-    base_type: alpine
     tier: 2
     versions:
       - 'latest'