[Buildroot] [git commit branch/2021.08.x] support/scripts: don't build board defconfigs with Gitlab's pipelines trigged on tag

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=eacad2319ac6c63219b7bba04e1d96a9be546455
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.08.x

Currently when a tag is added to the Buildroot git tree, the gitlab-ci
create a pipeline with several hundred of jobs (~750) to build all
defconfigs and execute the Buildroot testsuite.

However, there is only a limited number of gitlab-ci runner (9 runners)
and some jobs reach the timeout limit (24h) while waiting for a runner
[1]. Indeed, the Buildroot project doesn't use the Gitlab's shared
runners.

In addition to the pipeline created when a new tag is added to the
git repository, two pipelines are created each weeks to execute the
Buildroot testsuite (on monday [2]) and build all defconfigs (on
Thursday [3]).

At some point there are too many jobs waiting in gitlab due board
defconfigs builds. Indded a board defconfig requires a lot of time
(~30min) compared to other jobs in order to build a toolchain and a
kernel linux along with a basic rootfs. There is currently 262
defconfigs.

This is even worse when several pipelines are trigged at the same
time (new git tag and scheduled pipeline trigger).

In order to reduce the number of long jobs, don't build board
defconfigs with pipelines trigged on tag, keeping only the runtime
tests and the Qemu's defconfigs.

[1] https://gitlab.com/buildroot.org/buildroot/-/jobs/1758966541
[2] https://gitlab.com/buildroot.org/buildroot/-/pipelines/404035190
[3] https://gitlab.com/buildroot.org/buildroot/-/pipelines/401685550

Signed-off-by: Romain Naour <romain.naour at gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
Cc: Yann E. MORIN <yann.morin.1998 at free.fr>
Cc: Arnout Vandecappelle <arnout at mind.be>
Acked-by: Yann E. MORIN <yann.morin.1998 at free.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998 at free.fr>
(cherry picked from commit 8ea6eead60091587e51c38df5d2b6c0f5652a0c6)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 support/scripts/generate-gitlab-ci-yml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/support/scripts/generate-gitlab-ci-yml b/support/scripts/generate-gitlab-ci-yml
index 69c3fb275f..cf3e618873 100755
--- a/support/scripts/generate-gitlab-ci-yml
+++ b/support/scripts/generate-gitlab-ci-yml
@@ -36,6 +36,9 @@ gen_tests() {
              )
 
     if [ -n "${CI_COMMIT_TAG}" ]; then
+        # When a tag is added to the Buildroot git tree, we want
+        # to run the runtime tests and only test Qemu defconfigs.
+        defconfigs=( $(cd configs; LC_ALL=C ls -1 qemu_*_defconfig) )
         do_basics=true
         do_defconfigs=base
         do_runtime=true