ci: Add feature to use different meson versions

[nbyavuz]

We want to have a branch that uses a specific branch of meson for all tasks. Then, we can create a Cirrus cron "job" that tests Postgres againts different meson branches.

Set a different meson branch by using MESON_REPO and MESON_BRANCH environment variables. Use a bash script to install this specific meson branch and rebase current Postgres branch onto Postgres HEAD.

Fixes #81.

https://github.com/anarazel/pg-vm-images/pull/70 needs to be merged first.

[nbyavuz]

I pushed this with a commit to run on 'pg-ci-images-dev' project since https://github.com/anarazel/pg-vm-images/pull/70 didn't run on 'pg-ci-images' yet. After https://github.com/anarazel/pg-vm-images/pull/70 is merged, I will push this without "run on 'pg-ci-images-dev'" commit.

[anarazel]

I just tested it for the new meson version about to be released - very useful!

I got one failure that i'm somewhat confused by: https://cirrus-ci.com/task/6190199437262848?logs=configure#L8 that doesn't seem related to the new meson version, but doesn't happen otherwise?

An improvement for this would be to list which commit we rebased onto: https://cirrus-ci.com/task/6190199437262848?logs=install_meson_and_rebase#L46 doesn't allow to figure that out:

[21:31:59.899] + git remote add default-postgres https://github.com/postgres/postgres.git
[21:31:59.930] + git fetch default-postgres master
[21:32:04.399] From https://github.com/postgres/postgres
[21:32:04.399]  * branch              master     -> FETCH_HEAD
[21:32:04.399]  * [new branch]        master     -> default-postgres/master
[21:32:04.415] + git rebase --no-verify default-postgres/master
[21:32:05.879] Rebasing (1/1)
Successfully rebased and updated detached HEAD.

Something like

echo Rebasing onto: $(git show --no-patch --abbrev-commit  --pretty=oneline default-postgres/master)

maybe?

[nbyavuz]

I got one failure that i'm somewhat confused by: https://cirrus-ci.com/task/6190199437262848?logs=configure#L8 that doesn't seem related to the new meson version, but doesn't happen otherwise?

I found the cause and fixed it. It seems rebase part changing file endings to CLRF on Windows, I added git config core.autocrlf false.

Also, I realized that CI only collects *.diffs files but sometimes diff logs are written in *.diff files (for example pg_bsd_indent). It can be fixed by editing on_failure parts but I couldn't decide between editing on_failure parts and changing *.diff to *.diffs.

Something like

echo Rebasing onto: $(git show --no-patch --abbrev-commit  --pretty=oneline default-postgres/master)

Added.

[anarazel]

I got one failure that i'm somewhat confused by: https://cirrus-ci.com/task/6190199437262848?logs=configure#L8 that doesn't seem related to the new meson version, but doesn't happen otherwise?

I found the cause and fixed it. It seems rebase part changing file endings to CLRF on Windows, I added git config core.autocrlf false.

Great.

Also, I realized that CI only collects *.diffs files but sometimes diff logs are written in *.diff files (for example pg_bsd_indent). It can be fixed by editing on_failure parts but I couldn't decide between editing on_failure parts and changing *.diff to *.diffs.

Heh, yea, I noticed that too and even wrote an email about it: https://www.postgresql.org/message-id/20230711233307.hu4wetabjm5f7ver%40awork3.anarazel.de and am planning to rename the file.

Something like

echo Rebasing onto: $(git show --no-patch --abbrev-commit  --pretty=oneline default-postgres/master)

Added.

Thanks!