git sync --pull, git submit hang indefinitely when asking for password

[arxanas]

Description of the bug

This happens when we're being prompted interactively for a password e.g. to authenticate with Github over HTTPS. Askpass-style programs do not read stdin/write stdout, so #429 doesn't help. Instead, they directly read/write to the terminal (so that the password is hidden).

Furthermore, if the askpass program fails, it seems that Git falls back to prompting on the terminal manually, so there's no way to cancel asking for the password. For example, even when exit 1ing:

$ GIT_ASKPASS='./askpass.sh' git sync -p
branchless: running command: git fetch --all
Fetching origin
Fetching github
exiting 1
error: unable to read askpass response from './askpass.sh'
⠁ Running Git command: git fetch --all (13.1s)
^C

$ cat askpass.sh 
#!/bin/sh
echo >/dev/stderr 'exiting 1'
exit 1

Expected behavior

Either the password is prompted or the operation fails immediately.

Actual behavior

Hangs forever.

Version of rustc

No response

Automated bug report

No response

Version of git-branchless

No response

Version of git

No response

[cloudhan]

You might consider #574

So, in my opinion, sync should not fetch, should not have network activities involved. It should just automatically move all my working commit to a dest.

pull is an extremely easy command, un-pull is not! So just handle the control back to user will solve all your headache.

[arxanas]

My workaround is to do the following before a command which runs git fetch:

In my case, I use ssh-agent and ssh-add -K /path/to/key (on macOS) to unlock the key, and then git sync --pull works for me. Does that workaround work for you?