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Feature request: --json-status-fd could provide pid of command? #553

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teleclimber opened this issue Feb 9, 2023 · 4 comments · May be fixed by #576
Open

Feature request: --json-status-fd could provide pid of command? #553

teleclimber opened this issue Feb 9, 2023 · 4 comments · May be fixed by #576

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@teleclimber
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--json-status-fd gives a child-pid value, which is handy. In a lot of situations that is the pid of the COMMAND you're running in the sandbox.

But when run with --unshare-pid (and maybe others) bwrap forks itself and child-pid references the fork. I would like a way of getting the pid of the COMMAND. Could this be added to the JSON output?

Thanks.
@smcv
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smcv commented Feb 23, 2023

If this is achievable, I'd be happy to review a pull request. The easiest way to work out whether this is achievable or not would be to try to implement it and see what happens.

@WGH-
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WGH- commented Apr 17, 2023

A use case example: you might want to send SIGTERM to give your program a chance to terminate gracefully. However, child-pid is wrong pid to send signals to when bwrap runs pid 1.

WGH- added a commit to WGH-/bubblewrap that referenced this issue Apr 17, 2023
@WGH-
Add command-pid member to --json-status-fd
91da26a 
In cases where bwrap runs its own additional PID 1 process (e.g.
--unshare-pid), child-pid used to be the PID of that process, not the
PID of the user-specified COMMAND.

This is inconvenient as the user might want to send e.g. SIGTERM to the
command to give it a chance to exit gracefully.

Closes containers#553
WGH- added a commit to WGH-/bubblewrap that referenced this issue Apr 17, 2023
@WGH-
Add command-pid member to --json-status-fd
1f125c1 
In cases where bwrap runs its own additional PID 1 process (e.g.
--unshare-pid), child-pid is the PID of that process, not the
PID of the user-specified COMMAND.

This is inconvenient as the user might want to send e.g. SIGTERM to the
command to give it a chance to exit gracefully.

Closes containers#553
@WGH- WGH- linked a pull request Apr 17, 2023 that will close this issue
Open
WGH- added a commit to WGH-/bubblewrap that referenced this issue Apr 17, 2023
@WGH-
Add command-pid member to --json-status-fd
a14d3b3 
In cases where bwrap runs its own additional PID 1 process (e.g.
--unshare-pid), child-pid is the PID of that process, not the
PID of the user-specified COMMAND.

This is inconvenient as the user might want to send e.g. SIGTERM to the
command to give it a chance to exit gracefully.

Closes containers#553

Signed-off-by: WGH <wgh@torlan.ru>
@mcatanzaro
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I think we'll need this to fix this WebKit bug.

If this is achievable, I'd be happy to review a pull request. The easiest way to work out whether this is achievable or not would be to try to implement it and see what happens.

See #576 (and thank you!).

WGH- added a commit to WGH-/bubblewrap that referenced this issue Jun 11, 2024
@WGH-
Add command-pid member to --json-status-fd
4b2f32f 
In cases where bwrap runs its own additional PID 1 process (e.g.
--unshare-pid), child-pid is the PID of that process, not the
PID of the user-specified COMMAND.

This is inconvenient as the user might want to send e.g. SIGTERM to the
command to give it a chance to exit gracefully.

Closes containers#553

Signed-off-by: WGH <wgh@torlan.ru>
@mcatanzaro
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I think we'll need this to fix this WebKit bug.

(We wound up not needing it.)

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Add command-pid member to --json-status-fd WGH-/bubblewrap
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@WGH- @mcatanzaro @smcv @teleclimber