On Mon, May 19, 2025 at 5:28 PM 'Cedric Hombourger' via isar-users <
isar-users@googlegroups.com> wrote:

> When building root file-systems for a foreign architecture and needing
> to cache source packages, apt will be called from within the rootfs and
> consequently be executed under QEMU: this is terribly slow especially
> considering that source packages are downloaded one by one. This patch
> series introduces a wrapper function to run native commands against a
> rootfs with our special mounts such as /isar-apt. Some basic tests were
> performed to smoke test this approach and evaluate its performance. It
> should be noted that the changes introduce a new host tool dependency:
> bubblewrap. Alignment with projects such as kas would be required (had
> a positive discussion with Felix but no actions will be taken prior to
> receiving some form of agreement for this patch series).
>
> Changes since RFC patch:
>   - Let caller decide where to bind-mount the rootfs to
>   - Make the rootfs argument optional
>   - Support 32-bit rootfs (no lib64 there)
>
> Validated with "citest.py -t dev" (in a kas-container):
>
>  (1/6) citest.py:DevTest.test_dev: STARTED
>  (1/6) citest.py:DevTest.test_dev: PASS (752.07 s)
>  (2/6) citest.py:DevTest.test_dev_apps: STARTED
>  (2/6) citest.py:DevTest.test_dev_apps: PASS (770.95 s)
>  (3/6) citest.py:DevTest.test_dev_rebuild: STARTED
>  (3/6) citest.py:DevTest.test_dev_rebuild: PASS (275.02 s)
>  (4/6) citest.py:DevTest.test_dev_run_amd64_bookworm: STARTED
>  (4/6) citest.py:DevTest.test_dev_run_amd64_bookworm: PASS (47.87 s)
>  (5/6) citest.py:DevTest.test_dev_run_arm64_bookworm: STARTED
>  (5/6) citest.py:DevTest.test_dev_run_arm64_bookworm: PASS (31.20 s)
>  (6/6) citest.py:DevTest.test_dev_run_arm_bookworm: STARTED
>  (6/6) citest.py:DevTest.test_dev_run_arm_bookworm: PASS (32.34 s)
>
> Cedric Hombourger (4):
>   rootfs: introduce wrapper to run commands against a rootfs
>   deb-dl-dir: optimize caching of source packages using apt natively
>   image-postproc-extension: refactor systemd version checks
>   image-postproc-extension: extract systemd's version using rootfs_cmd
>
>  RECIPE-API-CHANGELOG.md                       |  6 ++
>  doc/user_manual.md                            |  1 +
>  meta/classes/deb-dl-dir.bbclass               | 37 +++--------
>  meta/classes/image-postproc-extension.bbclass | 12 ++--
>  meta/classes/rootfs.bbclass                   | 66 +++++++++++++++++++
>  5 files changed, 89 insertions(+), 33 deletions(-)
>


 Tested-by: Srinuvasan Arjunan <srinuvasan.a@siemens.com>

>
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