openssh bugs - Feb 2019 - [Bug 2965] New: OpenSSH for Windows hangs if there is no STDIN

https://bugzilla.mindrot.org/show_bug.cgi?id=2965

            Bug ID: 2965
           Summary: OpenSSH for Windows hangs if there is no STDIN
           Product: Portable OpenSSH
           Version: 7.9p1
          Hardware: Other
                OS: Windows 10
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: leese at google.com

The simplest repro is to run the following in a cmd shell:
> ssh user at host -- echo x < NUL:
x
GetConsoleMode on STD_INPUT_HANDLE failed with 6


... and then it hangs and is unresponsive to input. If instead you pipe
in an empty file it works fine.

This becomes a pain when you are writing a script that shells out to
ssh to run a single remote command, as you need to provide a stdin file
or it will hang. So for example, in python on Windows:

subprocess.check_output(['ssh', 'user at host', '--',
'echo', 'x'])

will hang.

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |djm at mindrot.org

--- Comment #1 from Damien Miller <djm at mindrot.org> ---
It looks like you're using the Microsoft OpenSSH client. Is this the
case?

If so, you'll need to report the bugs on their github tracker
https://github.com/PowerShell/Win32-OpenSSH/issues as their code is a
fairly substantial fork from what we release.

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--- Comment #2 from leese at google.com ---
I am using Microsoft OpenSSH and it appears they already know about
this issue (https://github.com/PowerShell/Win32-OpenSSH/issues/1330)

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|NEW                         |RESOLVED

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #3 from Damien Miller <djm at mindrot.org> ---
closing resolved bugs as of 8.6p1 release

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