Re: How to propagate SIGTERM to the foreground job, if any?

[Vincent Lefevre <vincent@vinc17.net>]

I think that I should start to test with something simpler, with
a command like

  unison -sshcmd ~/scripts/ssh ~/testdir ssh://remote_host/testdir

For ~/scripts/ssh, the following works with I type Ctrl-C
when ssh-add asks for the passphrase:

------------------------------------------------------------
#!/usr/bin/env zsh                                                              

unset DISPLAY

setopt TRAPS_ASYNC
trap 'echo term >&2; kill %1; exit' TERM INT

ssh-add file1 file2 file3

echo end... >&2
exit
------------------------------------------------------------

But %1 might not be the right job in more complex cases.
BTW, I'm wondering why %1 works, but not %%.

Moreover "term" is output twice. Why?

The following, based on what you proposed, also works:

------------------------------------------------------------
#!/usr/bin/env zsh

unset DISPLAY

setopt TRAPS_ASYNC
trap 'echo term >&2; kill $e; exit' TERM INT

ssh-add file1 file2 file3 &
e=$!
wait $e

echo end... >&2
exit
------------------------------------------------------------

This time, "term" is output 1, 2 or 3 times.

But these solutions do not work when ssh-add is in a zsh function,
even in a simple case like:

f()
{
  ssh-add file1 file2 file3
}

and use "f" instead of "ssh-add file1 file2 file3".

Is this a bug or is there any reason?

On 2024-04-21 17:41:38 -0700, Bart Schaefer wrote:
> Try this:
>   trap 'setopt MONITOR HUP NOCHECKJOBS; exit' TERM

This doesn't work at all with the above test.

> >   ssh-add file1 file2 file3 &
> >
> > ssh_askpass: exec(/usr/bin/ssh-askpass): No such file or directory
> > ssh_askpass: exec(/usr/bin/ssh-askpass): No such file or directory
> > ssh_askpass: exec(/usr/bin/ssh-askpass): No such file or directory
> 
> That's ... interesting.  The error makes it look like ssh-askpass is
> what's not being found, but it's probably choking trying to open a
> terminal.  I can think of some possible ways to fake it but perhaps
> with the above MONITOR tweak it isn't necessary.

I don't remember what I did exactly. These errors occur if DISPLAY
is set (with my usual wrapper, I unset DISPLAY, so that there may
be another cause).

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)