[Python-Dev] subprocess shell=True on Windows doesn't escape ^ character

[R. David Murray]

Also notice that using a list with shell=True is using the API
incorrectly.  It wouldn't even work on Linux, so that torpedoes
the cross-platform concern already :)

This kind of confusion is why I opened http://bugs.python.org/issue7839.

On Wed, 11 Jun 2014 16:58:30 -0500, Ryan <rymg19 at gmail.com> wrote:
> Of course! And, why not escape everything else, too?
> 
> abc -> ^a^b^c
> 
> echo %PATH% -> ^e^c^h^o^ ^%^P^A^T^H^%
> 
> In all seriousness, to me this is obvious. When you pass a command to the shell, naturally, certain details are shell-specific.
> 
> -10000. Bad idea. Very bad idea. If you want the ^ to be escaped, do it yourself. Or better yet, don't pass shell=True.
> 
> anatoly techtonik <techtonik at gmail.com> wrote:
> >I am banned from tracker, so I post the bug here:
> >
> >Normal Windows behavior:
> >
> >  >hg status --rev ".^1"
> >  M mercurial\commands.py
> >  ? pysptest.py
> >
> >  >hg status --rev .^1
> >  abort: unknown revision '.1'!
> >
> >So, ^ is an escape character. See
> >http://www.tomshardware.co.uk/forum/35565-45-when-special-command-line
> >
> >
> >But subprocess doesn't escape it, making cross-platform command fail on
> >Windows.
> >
> >---[cut pysptest.py]--
> >import subprocess as sp
> >
> ># this fails with
> ># abort: unknown revision '.1'!
> >cmd = ['hg', 'status', '--rev', '.^1']
> ># this works
> >#cmd = 'hg status --rev ".^1"'
> ># this works too
> >#cmd = ['hg', 'status', '--rev', '.^^1']
> >
> >try:
> >  print sp.check_output(cmd, stderr=sp.STDOUT, shell=True)
> >except Exception as e:
> >  print e.output
> >------------------------------
> >
> >-- 
> >anatoly t.
> >
> >
> >------------------------------------------------------------------------
> >
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