Re: [PATCH] gitlab: purge msys pacman cache

["罗勇刚(Yonggang Luo)" <luoyonggang@gmail.com>]

On Sat, Oct 11, 2025 at 12:05 AM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> For the Windows msys2 CI job we install many packages using pacman
> and use the GitLab cache to preserve the pacman cache across CI
> runs. While metadata still needs downloading, this avoids pacman
> re-downloading packages from msys2 if they have not changed.
>
> The problem is that pacman never automatically purges anything
> from its package cache. Thus the GitLab cache is growing without
> bound and packing/unpacking the cache is consuming an increasing
> amount of time in the CI job.
>
> If we run 'pacman -Sc' /after/ installing our desired package set,
> it will purge any cached downloaded packages that are not matching
> any installed package.
>
> This will (currently) cap the pacman download cache at approx
> 256 MB.
>
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> ---
>  .gitlab-ci.d/windows.yml | 1 +
>  1 file changed, 1 insertion(+)
>
> See a test job with this change, plus a find across the msys
> pacman cache, showing the cleanup effects....
>
> Before cleanup:
>
>   https://gitlab.com/berrange/qemu/-/jobs/11679136531#L34
>
> After cleanup:
>
>   https://gitlab.com/berrange/qemu/-/jobs/11679136531#L1126
>
> diff --git a/.gitlab-ci.d/windows.yml b/.gitlab-ci.d/windows.yml
> index 1e6a01bd9a..6e1135d8b8 100644
> --- a/.gitlab-ci.d/windows.yml
> +++ b/.gitlab-ci.d/windows.yml
> @@ -87,6 +87,7 @@ msys2-64bit:
>        mingw-w64-x86_64-pkgconf
>        mingw-w64-x86_64-python
>        mingw-w64-x86_64-zstd"
> +  - .\msys64\usr\bin\bash -lc "pacman -Sc --noconfirm"
>    - Write-Output "Running build at $(Get-Date -Format u)"
>    - $env:JOBS = $(.\msys64\usr\bin\bash -lc nproc)
>    - $env:CHERE_INVOKING = 'yes'  # Preserve the current working directory
> --
> 2.50.1
>

Reviewed-by: Yonggang Luo <luoyonggang@gmail.com>

-- 
         此致
礼
罗勇刚
Yours
    sincerely,
Yonggang Luo