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authorSimon Law <simon.law@ecometrica.com>2012-07-20 14:41:30 -0400
committerSimon Law <simon.law@ecometrica.com>2012-07-20 14:41:30 -0400
commiteae470eaaa1d3c95f8e58c5296ed28a01bcd74aa (patch)
treed5807412e33c624ea58479887f48b27fd54b5eca /wkhtmltopdf/subprocess.py
parentdf83b5a8045d1fe69b3ae4d5ffdc5f98069862dc (diff)
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wkhtmltopdf() uses subprocess.check_output() instead of a custom Popen call.
Diffstat (limited to 'wkhtmltopdf/subprocess.py')
-rw-r--r--wkhtmltopdf/subprocess.py44
1 files changed, 44 insertions, 0 deletions
diff --git a/wkhtmltopdf/subprocess.py b/wkhtmltopdf/subprocess.py
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+from __future__ import absolute_import
+
+from subprocess import *
+
+
+# Provide Python 2.7's check_output() function.
+try:
+ check_output
+except NameError:
+ def check_output(*popenargs, **kwargs):
+ r"""Run command with arguments and return its output as a byte string.
+
+ If the exit code was non-zero it raises a CalledProcessError. The
+ CalledProcessError object will have the return code in the returncode
+ attribute and output in the output attribute.
+
+ The arguments are the same as for the Popen constructor. Example:
+
+ >>> check_output(["ls", "-l", "/dev/null"])
+ 'crw-rw-rw- 1 root root 1, 3 Oct 18 2007 /dev/null\n'
+
+ The stdout argument is not allowed as it is used internally.
+ To capture standard error in the result, use stderr=STDOUT.
+
+ >>> check_output(["/bin/sh", "-c",
+ ... "ls -l non_existent_file ; exit 0"],
+ ... stderr=STDOUT)
+ 'ls: non_existent_file: No such file or directory\n'
+ """
+ if 'stdout' in kwargs:
+ raise ValueError('stdout argument not allowed, it will be overridden.')
+ process = Popen(stdout=PIPE, *popenargs, **kwargs)
+ output, unused_err = process.communicate()
+ retcode = process.poll()
+ if retcode:
+ cmd = kwargs.get("args")
+ if cmd is None:
+ cmd = popenargs[0]
+ error = CalledProcessError(retcode, cmd)
+ # Add the output attribute to CalledProcessError, which
+ # doesn't exist until Python 2.7.
+ error.output = output
+ raise error
+ return output