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Make pip dry run work better for the common case

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This change allows the pip module to figure out if something needs to be done during
a dry run using 'pip freeze'. This is implemented for the most basic case: name,
version and state=(present|absent). In other cases it will fall back to the old
behavior.
This commit is contained in:
Anton Lindström 2014-03-26 15:08:23 +01:00
parent b3cdcbff75
commit 71949fbc9f
1 changed files with 35 additions and 3 deletions
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38
library/packaging/pip
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@ -153,6 +153,19 @@ def _get_full_name(name, version=None):
resp = name + '==' + version
return resp
def _is_present(name, version, installed_pkgs):
for pkg in installed_pkgs:
if '==' not in pkg:
continue
[pkg_name, pkg_version] = pkg.split('==')
if pkg_name == name and (version is None or version == pkg_version):
return True
return False
def _get_pip(module, env=None, executable=None):
# On Debian and Ubuntu, pip is pip.
@ -295,13 +308,32 @@ def main():
cmd += ' %s' % _get_full_name(name, version)
elif requirements:
cmd += ' -r %s' % requirements
if module.check_mode:
module.exit_json(changed=True)
this_dir = tempfile.gettempdir()
if chdir:
this_dir = os.path.join(this_dir, chdir)
if module.check_mode:
if env or extra_args or requirements or state == 'latest' or not name:
module.exit_json(changed=True)
elif name.startswith('svn+') or name.startswith('git+') or \
name.startswith('hg+') or name.startswith('bzr+'):
module.exit_json(changed=True)
freeze_cmd = '%s freeze' % pip
rc, out_pip, err_pip = module.run_command(freeze_cmd, cwd=this_dir)
if rc != 0:
module.exit_json(changed=True)
out += out_pip
err += err_pip
is_present = _is_present(name, version, out.split())
changed = (state == 'present' and not is_present) or (state == 'absent' and is_present)
module.exit_json(changed=changed, cmd=freeze_cmd, stdout=out, stderr=err)
rc, out_pip, err_pip = module.run_command(cmd, path_prefix=path_prefix, cwd=this_dir)
out += out_pip
err += err_pip