core: script btraceback support environment variable

[bruno-at-bareos]

We add the support of environement variables to allow user to adjust
btraceback exit.

Fix #2770

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• core/scripts/btraceback.in

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📝 Walkthrough

Walkthrough

The traceback script now uses one configurable SMTP command with timeout handling. Media vault timestamp conversion now uses datetime.timezone.utc.

Changes

Traceback email delivery

Layer / File(s)	Summary
Configure and limit traceback email delivery core/scripts/btraceback.in	The script preserves existing mail settings through BAREOS_BTRACEBACK_SMTPCMD, quotes the traceback path, and applies a 30-second timeout with a 5-second kill grace period.

Media vault timestamps

Layer / File(s)	Summary
Use timezone.utc for FTP timestamps contrib/misc/media_vault/media_vault.py	Creation, access, and modification timestamps now use datetime.timezone.utc instead of datetime.UTC.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 0ed39

This localized change introduces no actionable merge-blocking risk and is merge-ready after normal checks and review.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	⚠️ Warning	The btraceback change matches the objectives, but the unrelated media_vault.py timestamp conversion is outside the stated scope.	Remove the media_vault.py change or explain its relationship to this pull request in the description.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	The description references issue #2770, and the stated objectives clearly explain how the changes address the issue.
Title check	✅ Passed	The title clearly identifies the primary change: adding environment-variable support to the btraceback script. It is concise and suitable as a changelog entry.
Description check	✅ Passed	The description states the purpose, references issue #2770, and includes most template sections and checklist items. The Tests section from the template is missing, but the description remains suffici…

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

Full details: Description check

Explanation

The description states the purpose, references issue #2770, and includes most template sections and checklist items. The Tests section from the template is missing, but the description remains sufficiently complete and focused.

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• Commit unit tests in branch dev/bruno/master/fix-2770-btraceback-timeout-quick-exit

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Actionable comments posted: 2

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Inline comments:
In `@core/scripts/btraceback.in`:
- Around line 113-114: Update the timeout invocation in the traceback mail
pipeline to include a 1-second hard-kill grace period via timeout’s -k option,
while preserving the existing timeout duration and mail arguments.
- Around line 106-110: Update the BAREOS_BTRACEBACK_MTA, BAREOS_BTRACEBACK_HOST,
BAREOS_BTRACEBACK_FROM, BAREOS_BTRACEBACK_RECIPIENT, and
BAREOS_BTRACEBACK_TIMEOUT declarations to assign their default values rather
than execute expansions as standalone commands, ensuring configured MTA handling
remains subject to the intended timeout.

Apply the same fix in `@core/scripts/btraceback.in` around lines 107 - 109.

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Inline comments:
In `@contrib/misc/media_vault/media_vault.py`:
- Around line 887-892: Apply Black formatting to the ctime, atime, and mtime
datetime.fromtimestamp conversions, including spacing after commas and wrapping
the chained strftime expression to remain within the default line length.

In `@core/scripts/btraceback.in`:
- Around line 112-113: Update the timeout invocation in the traceback delivery
pipeline so the kill-after option is placed before the timeout duration,
ensuring timeout executes the configured mailer command with the intended
5-second kill grace period.

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• contrib/misc/media_vault/media_vault.py
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[bruno-at-bareos]

@sebsura do you think we should document with details the use of the new variable to that chapter https://docs.bareos.org/Appendix/Debugging.html#core-debugging ?

[bruno-at-bareos]

simplify this by having only one line variable containing all, so we can disable it.

[bruno-at-bareos]

@sebsura I've gone the path @arogge suggested with only one line.
Locally tested here with export BAREOS_BTRACEBACK_SMTPCMD=/bin/true
can be also set in systemd service file for the daemon ...
I've not found a drawback, and trace is created when kill -6 daemon ...
I can still add a note in the documentation, following what you will find.
Squashing will be done in final step.

[sebsura]

Looks good to me!

[sebsura]

Thanks for the awesome work!