Bug report: cache-deb-src fails with 'debsrc_undo_mounts: not found' on isar v1.1

["'Amaia Gomez' via isar-users" <isar-users@googlegroups.com>]

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Hello isar-users,

I am trying to use the cache-deb-src feature to cache upstream Debian source packages for long-term reproducibility. I am running isar v1.1 (commit cc5a5d98) on Debian 13 (Trixie) amd64, building an image for an Intel Elkhart Lake (x86_64) target with Debian Trixie.

Configuration in local.conf:
  BASE_REPO_FEATURES = "cache-deb-src"

The build fails with:
  ERROR: No packages were found in apt cache
  run.do_cache_deb_src: debsrc_undo_mounts: not found
  WARNING: exit code 127 from a shell command.

I found two issues:

1. The function 'debsrc_undo_mounts' is called in meta/classes-recipe/deb-dl-dir.bbclass (line ~150) when the apt cache is empty, but this function is not defined anywhere in the isar codebase. This causes exit code 127 (command not found).

2. Even with ROOTFS_FEATURES:remove = "clean-package-cache", the function rootfs_export_package_cache executes BEFORE rootfs_install_pkgs_install in the ROOTFS_INSTALL_COMMAND sequence. This means the apt cache is still empty when the export runs, because the packages have not been downloaded yet.

The execution order observed in the log is:
  rootfs_export_package_cache  (cache is empty at this point)
  rootfs_install_clean_files
  rootfs_install_pkgs_install  (packages are downloaded here)

Is there a workaround available? Is this a known issue?

Thank you,
Amaia Gomez


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