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Environment: Windows 7, Python 2.7, Fabric 0.9.2 final
When using path names with spaces on Windows, you usually wrap the whole path into double quotes. I just can't make this work with Fabric and local(), and the results are quite strange.
Here is my example script:
from fabric.api import *
cmd = r'dir "sub directory with spaces"'
And the output is:
Command: dir "sub directory with spaces"
[localhost] run: dir "sub directory with spaces"
The system cannot find the file specified.
Fatal error: local() encountered an error (return code 1) while executing 'dir "sub directory with spaces"'
Of course, copy/pasting the command into the console works just fine. (Output omitted for boringness.)
This seems to be somehow related to some strange behaviour of the subprocess.Popen class and the subprocess.list2cmdline function it uses.
I extracted the local() implementation from the 0.9 branch (source:/entry/fabric/0.9/fabric/operations.py) and removed the in-place list creation on the Popen constructor call and then it works fine (example code attached). That is, I replaced
p = subprocess.Popen([real_command], shell=True, stdout=out_stream, stderr=err_stream)
p = subprocess.Popen(real_command, shell=True, stdout=out_stream, stderr=err_stream)
No idea if this is valid for all other platforms as well.
Originally submitted by Henrik Heimbuerger (hheimbuerger) on 2010-11-16 at 05:47am EST
Closed as Done on 2011-05-02 at 01:31pm EDT
Henrik Heimbuerger (hheimbuerger) posted:
Hmm, can't edit the description or add related tickets. :(
So here's the link to the documentation on Popen: http://docs.python.org/library/subprocess.html#subprocess.Popen
Source of list2cmdline: http://svn.python.org/view/python/tags/r27/Lib/subprocess.py?view=markup#list2cmdline
Possible related bugs: #118, #155
on 2010-11-16 at 07:03am EST
Jeff Forcier (bitprophet) posted:
I don't think #118 or #155 are actually related, despite mentioning quotes, since if your diagnosis is accurate this has to do with local() and subprocess -- those other ones are related to run().
From reading those docs re: subprocess and list2cmdline, it sounds like we may be able to get away with a win32 check that toggles the change you referred to, i.e. going from a string-in-a-list to just a string.
If you could try changing the [real_command] expression on that line to real_command if win32 else [real_command] and see if that does it, I'd appreciate it. You'll also need to from fabric.state import win32 inside the top of the function (doing it at module level usually results in circular imports).
real_command if win32 else [real_command]
from fabric.state import win32
on 2010-11-16 at 10:05am EST
Yes, I can confirm that it works for me after making the modifications you suggested (my new demonstration fabfile is attached).
Are you sure this platform switch is necessary, though? Reading the corresponding line for Unix, "If args is a string, it specifies the command string to execute through the shell", that sounds to me as if it should work as well.
What is the reasoning for passing an (always 1-element) list in there? It's not like local() gave you the option to pass the arguments as a list instead of an already concatenated string.
on 2010-11-16 at 12:13pm EST
I seem to remember us having to switch to the list version to avoid other, oddball problems in some edge cases. You're quite right that as the docs go, it should be cool to have it as just a string. But given that this only seems to affect Windows (nobody's ever mentioned it being a problem on POSIX platforms), I'd prefer the platform specific tweak for now to limit any potential damage.
on 2010-11-16 at 04:46pm EST
Raymond Cote (rgacote) posted:
Just got caught with this error myself (Fabric 0.9.3 installed with pypm, Python 2.7, Windows 7, 32-bit).
Problem not isolated to directories with strings.
In Fabric 0.9.1 on Windows XP, Python 2.5, these commands run fine:
local(r'rmdir /S /Q .\dist')
In Fabric 0.9.3 on Windows 7, Python 2.7, they always fail. When I dig into the error it says the command "mkdir dist" is not found.
After reading through the above, I changed line 632 of operations.py to be:
p = subprocess.Popen(real_command if win32 else [real_command], shell=True, stdout=out_stream,
and added from fabric.state import win32
to the start of the routine. Now all runs as expected on my Windows box.
on 2010-12-19 at 11:50am EST
Thanks for doing that tweak/test, Raymond -- that definitely sounds like the way to go. I'll try to incorporate it soon (not on my own computer right now, stranded at the in-laws thanks to the northeast US blizzard. hurrah.)
on 2010-12-29 at 03:07pm EST
**** (khorn) posted:
I have also encountered this issue, and the workarounds given in this ticket work for me as well.
on 2011-02-01 at 03:06pm EST
David Chandek-Stark (dchandekstark) posted:
I've noticed a number of issues with Fabric 0.9.3 on Python 2.7 (32)/Windows 7 (64), some of which are probably not related to Fabric proper. But the workaround in this ticket solved my problem executing
local('svn ls http://svn.example.com/')
on 2011-02-15 at 10:21am EST
Applied in changeset commit:eb9c7a86dac25042c8b66bfafa89de4ca10ae761.
on 2011-03-16 at 10:04pm EDT
**** (joelryan2k) posted:
In testing the 0.9 branch, I get the error:
File "c:\pythonenv\myloaninfo\src\fabric\fabric\operations.py", line 631, in local
cmd_arg = [real_command] if win32 else real_command
NameError: global name 'win32' is not defined
The 1.0 branch works fine
on 2011-03-17 at 12:08pm EDT
Thanks, you found a dumb mistake which I've just fixed+pushed :) (An import was missing which is present in 1.0 and master but not 0.9.)
on 2011-03-17 at 12:25pm EDT
I have tested your fix and verified that this has fixed .9. 1.0 is still working, too
on 2011-03-17 at 01:10pm EDT
Siddhaarth Verma (sid) posted:
This is still broken for me using Fabric 1.0.1 on Windows XP, Python 2.7.1.
It works in the very simple case of a command with no spaces (e.g. local("dir")), but fails for something like local("dir w*").
This is easily fixed by changing line 1005 in fabric/operations from:
cmd_arg = wrapped_command if win32 else [wrapped_command]
on 2011-04-27 at 03:56pm EDT
Oops, the above should read:
cmd_arg = [wrapped_command] if win32 else wrapped_command
on 2011-04-27 at 03:58pm EDT
Yes, looks like the original "fix" was logically inverted. Just pushed the flipped version to the 1.0 branch so it will be in 1.0.2 -- I will probably release 1.0.2 shortly before/after 1.1 which should be out this week.
on 2011-04-27 at 04:35pm EDT
Sid -- if you're able to check out the 1.0 branch from the Git repo and verify that it actually does work now, that would be great. No pressure though.
on 2011-04-27 at 04:36pm EDT
Jeff - confirmed, this is working correctly for me in the 1.0 branch. Thanks for the quick fix!
on 2011-05-02 at 01:29pm EDT
Forgot to change the ticket itself...meh.
on 2011-05-02 at 01:31pm EDT
Fixes #258 - Windows local logic inversion fix
Tweak subprocess invocation on Windows.