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Fix handling of pip show result when using new version of pip

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which returns nonzero error code if the package is not installed.
This commit is contained in:
vitaut 2015-07-26 08:25:52 -07:00
parent 76d1218345
commit 3b224e1813
1 changed files with 6 additions and 4 deletions
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10
doc/build.py
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@ -11,12 +11,14 @@ def pip_install(package, commit=None):
cmd = ['pip', 'show', package.split('/')[1]]
p = Popen(cmd, stdout=PIPE, stderr=PIPE)
stdout, stderr = p.communicate()
if p.returncode != 0:
# Check if pip supports the show command.
if stdout:
return # Already installed
elif p.returncode != 0:
# Old versions of pip such as the one installed on Travis don't support
# the show command - continue installation in this case.
# Otherwise throw CalledProcessError.
if 'No command by the name pip show' not in stderr:
raise CalledProcessError(p.returncode, cmd)
elif stdout:
return # Already installed
package = 'git+git://github.com/{0}.git@{1}'.format(package, commit)
check_call(['pip', 'install', '-q', package])