borgmatic init fails where borg init succeeds

[cmougin]

Hi,
I’ve been struggling quite a lot with my ansible scripts until I narrowed down to this one issue:
after successful launch of the image/container, any attempt to init the repo with bormatic fails while the equivalent init with borg directly actually works.
evidences to demonstrate this:
$ sudo docker run --detach --name borgmatic -v /home/debian/backup/mnt/OneDrive:/mnt/source:ro -v /home/debian/backup/borg-repository:/mnt/borg-repository -v /home/debian/backup/borg-rclone:/etc/borgmatic.d/ -v /home/debian/backup/borg-rclone:/root/.config/borg -v /home/debian/backup/borg-rclone:/root/.ssh -v /home/debian/backup/borg-rclone:/root/.cache/borg -e TZ=Europe/Paris ghcr.io/borgmatic-collective/borgmatic
$ sudo docker exec -it borgmatic /bin/sh

borgmatic init -e none

/mnt/borg-repository is not a valid repository. Check repo config.
/mnt/borg-repository: Error running actions for repository
Command '('borg', 'info', '--json', '/mnt/borg-repository')' returned non-zero exit status 15.
/etc/borgmatic.d/config.yaml: An error occurred

summary:
/etc/borgmatic.d/config.yaml: An error occurred
/mnt/borg-repository: Error running actions for repository
Command '('borg', 'info', '--json', '/mnt/borg-repository')' returned non-zero exit status 15.

Need some help? https://torsion.org/borgmatic/#issues

borg info /mnt/borg-repository --debug

using builtin fallback logging configuration
33 self tests completed in 1.20 seconds
/mnt/borg-repository is not a valid repository. Check repo config.
Traceback (most recent call last):
File "/usr/local/lib/python3.12/site-packages/borg/repository.py", line 470, in open
with open(os.path.join(self.path, 'config')) as fd:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: '/mnt/borg-repository/config'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/lib/python3.12/site-packages/borg/archiver.py", line 5391, in main
exit_code = archiver.run(args)
^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/borg/archiver.py", line 5309, in run
rc = func(args)
^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/borg/archiver.py", line 176, in wrapper
with repository:
File "/usr/local/lib/python3.12/site-packages/borg/repository.py", line 217, in enter
self.open(self.path, bool(self.exclusive), lock_wait=self.lock_wait, lock=self.do_lock)
File "/usr/local/lib/python3.12/site-packages/borg/repository.py", line 474, in open
raise self.InvalidRepository(self.path)
borg.repository.Repository.InvalidRepository: /mnt/borg-repository is not a valid repository. Check repo config.

Platform: Linux f18dd8d5e0e4 6.1.0-23-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.99-1 (2024-07-15) x86_64
Linux: Unknown Linux
Borg: 1.4.0 Python: CPython 3.12.3 msgpack: 1.0.8 fuse: llfuse 1.5.0 [pyfuse3,llfuse]
PID: 374 CWD: /
sys.argv: ['/usr/local/bin/borg', 'info', '/mnt/borg-repository', '--debug']
SSH_ORIGINAL_COMMAND: None

borg init -e none /mnt/borg-repository/

borg info /mnt/borg-repository

Repository ID: 9acbdf9faf978c814a3ef2a57f658c056fd34ad5b41eb9c8e926d789aab40576
Location: /mnt/borg-repository
Encrypted: No
Cache: /root/.cache/borg/9acbdf9faf978c814a3ef2a57f658c056fd34ad5b41eb9c8e926d789aab40576
Security dir: /root/.config/borg/security/9acbdf9faf978c814a3ef2a57f658c056fd34ad5b41eb9c8e926d789aab40576

                   Original size      Compressed size    Deduplicated size

All archives: 0 B 0 B 0 B

                   Unique chunks         Total chunks

Chunk index: 0 0

Despite I thus have a workaround, I trust it’s worth reporting this issue for the next guys like me to give it a try.
best
Christophe