https://bz.mercurial-scm.org/show_bug.cgi?id=5455
Bug ID: 5455
Summary: ssh doesn't prompt for key passphrase on terminal when
using chg
Product: Mercurial
Version: 4.0
Hardware: All
OS: Linux
Status: UNCONFIRMED
Severity: feature
Priority: wish
Component: chg
Assignee: bugzi...@mercurial-scm.org
Reporter: gregory.sz...@gmail.com
CC: arcppzju+hg...@gmail.com, mercurial-de...@selenic.com
$ ./hg push -f user --debug
pushing to ssh://hg.mozilla.org/users/gszorc_mozilla.com/hg
running ssh hg.mozilla.org 'hg -R users/gszorc_mozilla.com/hg serve --stdio'
sending hello command
sending between command
Enter passphrase for key '<redacted>':
That works!
But when using chg:
$ chg push -f user --debug
pushing to ssh://hg.mozilla.org/users/gszorc_mozilla.com/hg
running ssh hg.mozilla.org 'hg -R users/gszorc_mozilla.com/hg serve --stdio'
sending hello command
sending between command
remote: ssh_askpass: exec(/usr/bin/ssh-askpass): No such file or directory
remote: Permission denied (publickey).
abort: no suitable response from remote hg!
This is on Ubuntu 16.10. Installing an ssh-askpass package fixes things. But it
launches some graphical widget to enter my password. I want the default,
terminal based prompt to "just work."
From the ssh man page:
SSH_ASKPASS If ssh needs a passphrase, it will read the passphrase
from the current terminal if it was run from a terminal. If ssh does
not have a terminal associated with it but DISPLAY
and SSH_ASKPASS are set, it will execute the program specified by
SSH_ASKPASS and open an X11 window to read the
passphrase. This is particularly useful when calling ssh from a .xsession or
related script. (Note that on some machines it may
be necessary to redirect the input from /dev/null to make this work.)
I haven't looked at the openssh source code, but I suspect stdin not being a
TTY is changing the behavior of OpenSSH. I wonder if there is a way we can
force openssh to read from stdin. If not, a hacky workaround would be to
provide our own SSH_ASKPASS implementation that reads from stdin. Yuck.
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