how to debug non-zero exit code

[Victor A. Stoichita]

Hi list,

Since yesterday my mu4e signals an error "Update process returned with
non-zero exit code".

Usually I’d look for the cause by running "mbsync -a" then "mu index" in
a terminal. This time, both commands exit with zero status in the
shell (checked it with "echo $?"). Is there a way to get more verbose
debug output from mu4e itself ?

I have mu 0.9.16 and emacs 24.5.1

Cheers,
Victor

[Dirk-Jan C. Binnema]

Post by Victor A. Stoichita
Hi list,
Since yesterday my mu4e signals an error "Update process returned with
non-zero exit code".
Usually I’d look for the cause by running "mbsync -a" then "mu index" in
a terminal. This time, both commands exit with zero status in the
shell (checked it with "echo $?"). Is there a way to get more verbose
debug output from mu4e itself ?
I have mu 0.9.16 and emacs 24.5.1

Perhaps try to replicate what mu4e does as closely as possible, ie;

(start-process-shell-command "test-mu4e" "test-mu4e"
mu4e-get-mail-command)

Then check what's in the test-mu4e buffer.

Kind regards,
Dirk.

[Victor A. Stoichita]

Post by Dirk-Jan C. Binnema
Perhaps try to replicate what mu4e does as closely as possible, ie;
(start-process-shell-command "test-mu4e" "test-mu4e"
mu4e-get-mail-command)
Then check what's in the test-mu4e buffer.

Thanks Dirk-Jan!

It’s probably an instance of Murphy’s law applied to asking for help,
but the error vanished "by itself" and now I can’t reproduce it any
longer. I’m positive though it was here for a few days before I asked.
I’ll use your advice to debug if it comes back.

All the best,
Victor