Using python-apt's apt_pkg with a chroot turns out to be non-trivial unlike apt.cache.
I'm running a script [0] on a trixie system and need to interact with the cache in a testing chroot. The chroot is created with mmdebstrap --mode=unshare, and the script is run via unshare as well. Setting RootDir in the config does not result in the chroot paths to be used: $ unshare --map-auto --map-user=65536 --map-group=65536 --keep-caps -- ./bin/resolve-dependencies.py -vdp opencv -u 2>&1 | tee /tmp/resolve-dependencies.log Resolving dependencies for: opencv Chroot already exists: /var/tmp/testing-chroot config: RootDir "/var/tmp/testing-chroot"; list: [<apt_pkg.MetaIndex object: type='deb', uri:'http://ftp.nl.debian.org/debian/' dist='trixie' is_trusted='1'>, <apt_pkg.MetaIndex object: type='deb', uri:'http://ftp.nl.debian.org/debian/' dist='trixie-updates' is_trusted='1'>, <apt_pkg.MetaIndex object: type='deb', uri:'http://security.debian.org/debian-security/' dist='trixie-security' is_trusted='1'>, <apt_pkg.MetaIndex object: type='deb', uri:'http://ftp.nl.debian.org/debian/' dist='trixie-backports' is_trusted='1'>, <apt_pkg.MetaIndex object: type='deb', uri:'http://debug.mirrors.debian.org/debian-debug/' dist='trixie-debug' is_trusted='1'>] Reading package lists... Done Building dependency tree... Done Reading state information... Done Traceback (most recent call last): File "/home/bas/git/release-team/release.debian.org/bin/resolve-dependencies.py", line 216, in <module> sys.exit(main()) ~~~~^^ File "/home/bas/git/release-team/release.debian.org/bin/resolve-dependencies.py", line 212, in main return resolve_dependencies() File "/home/bas/git/release-team/release.debian.org/bin/resolve-dependencies.py", line 97, in resolve_dependencies cache.update(apt.progress.text, source_list) ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ apt_pkg.Error: E:Could not open lock file /var/lib/apt/lists/lock - open (13: Permission denied), E:Unable to lock directory /var/lib/apt/lists/ How can apt_pkg be used with a chroot? apt.Cache(rootdir) works, but it does not provide access to source packages like apt_pkg.SourceRecords. [0] https://salsa.debian.org/sebastic/release.debian.org/-/blob/ce71f7e543283c7fcca0a701fe22667ae7a188a2/bin/resolve-dependencies.py Kind Regards, Bas Please CC me as I'm not subscribed to the list. -- PGP Key ID: 4096R/6750F10AE88D4AF1 Fingerprint: 8182 DE41 7056 408D 6146 50D1 6750 F10A E88D 4AF1
