Issue #16300 has been reported by Josh Cooper.
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Bug #16300: Acceptance test fails on Windows due to mintty
https://projects.puppetlabs.com/issues/16300
Author: Josh Cooper
Status: Accepted
Priority: Normal
Assignee:
Category:
Target version:
Affected Puppet version:
Keywords: windows mintty pty
Branch:
When executing the acceptance test
`ticket_11727_support_stdin_parsing_in_puppet_parser_validate.rb` on Windows,
this step fails on windows:
<pre>
step "validate with a tty parses the default manifest"
on agents, puppet('parser', 'validate'), :pty => true do
</pre>
The `pty` option causes the ssh client to request a pty to be allocated. This
can be simulated as:
<pre>
$ ssh -t [email protected] "/cygdrive/c/ruby187/bin/ruby -e 'puts
STDIN.tty?'"
debug1: Entering interactive session.
debug2: channel 0: request pty-req confirm 1
debug2: PTY allocation request accepted on channel 0
</pre>
The cygwin sshd reports that it allocated a console. However, it executes the
mintty terminal emulator, which does not provide a real windows console. See
<http://code.google.com/p/mintty/issues/detail?id=56#c29>. So `IO#tty?` is
always false when using mintty.
This can be seen without ssh. From a local cmd.exe process, just execute
`mintty.exe` and call ruby:
<pre>
C:\> mintty.exe
$ mintty --version
mintty 1.0.3
$ ruby --version
ruby 1.8.7 (2011-02-18 patchlevel 334) [i386-mingw32]
$ ruby -e "puts STDIN.tty?"
false
</pre>
The reason for this is Ruby's `IO#tty?` method calls the `_isatty` function (in
MS CRT), which only returns true if the file descriptor is associated with a
character device (not a file, socket, named pipe, etc). See
<http://msdn.microsoft.com/en-us/library/f4s0ddew.aspx>. Since mintty redirects
terminal IO using named pipes, `IO#tty?` returns false.
Other interesting links:<br>
<https://groups.google.com/forum/#!topic/rubyinstaller/G6MWe1iyMao><br>
<http://stackoverflow.com/questions/3648711/detect-nul-file-descriptor-isatty-is-bogus><br>
<http://jira.codehaus.org/browse/JRUBY-5068>
Also Microsoft's SUA includes a built in sshd server that provides ptys, but it
has been deprecated starting with Windows 8.
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