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

Ryan rymg19 at gmail.com
Wed Jun 11 23:58:30 CEST 2014 
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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>
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