Re: [PATCH] Fix cache-deb-src functionality for non-amd64 builds

["'cedric.hombourger@siemens.com' via isar-users" <isar-users@googlegroups.com>]

On Tue, 2025-07-22 at 07:27 +0200, Cedric Hombourger wrote:
> On Thu, 2025-07-17 at 13:51 +0300, Anton Mikanovich wrote:
> > Commit f0da749f introduced `apt-cache -o Dir=${rootfs} dumpavail`
> > method to get info about packages installed in rootfs, instead of
> > parsing dpkg.log previuosly used.
> 
> previously
> 
> > 
> > But it does not work in case of foreing architecture used. The list
> 
> foreign
> 
> > comes empty and no source packages get downloaded.
> > 
> > Instead, chroot into the rootfs and run this inside. The
> > difference:
> 
> Yes but with a significant performance hit (QEMU)
> I can recheck our options. This is a reminder that I had earlier
> proposed
> https://lists.isar-build.org/isar-users/20250515150727.1764989-1-cedric.hombourger@siemens.com/T/#t
> (probably does not address this specific issue though)

That issue did ring a bell and I was able to find the fix I had
suggested earlier "specify target architecture for apt-cache lookups"


https://lists.isar-build.org/isar-users/20250417201747.90299-1-cedric.hombourger@siemens.com/

> 
> > 
> > Works for the same arch:
> >   apt-cache -o Dir=/build/tmp/work/debian-bookworm-amd64/isar-
> > image-
> > base-qemuamd64/1.0-r0/rootfs dumpavail | wc -l
> >   1190397
> > 
> > Doesn't work for the foreign arch:
> >   apt-cache -o Dir=/build/tmp/work/debian-bookworm-arm64/isar-
> > image-
> > base-qemuarm64/1.0-r0/rootfs/ dumpavail | wc -l
> >   0
> > 
> > After the patch:
> >   sudo chroot /build/tmp/work/debian-bookworm-arm64/isar-image-
> > base-
> > qemuarm64/1.0-r0/rootfs/ apt-cache dumpavail | wc -l
> >   1170789
> > 
> > Signed-off-by: Anton Mikanovich <amikan@ilbers.de>
> > ---
> >  meta/classes/deb-dl-dir.bbclass | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/meta/classes/deb-dl-dir.bbclass b/meta/classes/deb-dl-
> > dir.bbclass
> > index 3f560da4..1f3876db 100644
> > --- a/meta/classes/deb-dl-dir.bbclass
> > +++ b/meta/classes/deb-dl-dir.bbclass
> > @@ -68,7 +68,9 @@ debsrc_download() {
> >      trap "rm -f ${avail} ${wanted}" EXIT
> >  
> >      # List all packages known to apt
> > -    apt-cache -o Dir=${rootfs} dumpavail |
> > debsrc_source_version_filter > ${avail}
> > +    sudo -E chroot --userspec=$( id -u ):$( id -g ) ${rootfs} \
> > +        apt-cache dumpavail \
> > +        | debsrc_source_version_filter > ${avail}
> >  
> >      # Use apt-ftparchive to scan all .deb files found in the
> > download directory
> >      # and get the <source> <version> pairs that we wish to
> > download
> > -- 
> > 2.34.1
> > 
> 

-- 
Cedric Hombourger
Siemens AG
www.siemens.com

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