164 lines
4.3 KiB
Python
Executable file
164 lines
4.3 KiB
Python
Executable file
#!/usr/bin/python
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# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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# I wanted to keep this simple at first, so for now this checks out
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# from the MASTER branch of a repo at a particular SHA or
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# tag. Latest is not supported, you should not be doing
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# that. Branch checkouts are not supported. Contribs
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# welcome! -- MPD
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try:
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import json
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except ImportError:
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import simplejson as json
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import os
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import sys
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import shlex
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import subprocess
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# ===========================================
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# Basic support methods
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def exit_json(rc=0, **kwargs):
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print json.dumps(kwargs)
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sys.exit(rc)
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def fail_json(**kwargs):
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kwargs['failed'] = True
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exit_json(rc=1, **kwargs)
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# ===========================================
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# convert arguments of form a=b c=d
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# to a dictionary
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# FIXME: make more idiomatic
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if len(sys.argv) == 1:
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fail_json(msg="the command module requires arguments (-a)")
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argfile = sys.argv[1]
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if not os.path.exists(argfile):
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fail_json(msg="Argument file not found")
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args = open(argfile, 'r').read()
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items = shlex.split(args)
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if not len(items):
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fail_json(msg="the command module requires arguments (-a)")
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params = {}
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for x in items:
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(k, v) = x.split("=")
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params[k] = v
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dest = params['dest']
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repo = params['repo']
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version = params.get('version', 'HEAD')
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# ===========================================
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def get_version(dest):
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''' samples the version of the git repo '''
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os.chdir(dest)
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cmd = "git show --abbrev-commit"
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sha = os.popen(cmd).read().split("\n")
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sha = sha[0].split()[1]
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return sha
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def clone(repo, dest):
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''' makes a new git repo if it does not already exist '''
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try:
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os.makedirs(dest)
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except:
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pass
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cmd = "git clone %s %s" % (repo, dest)
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cmd = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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return cmd.communicate()
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def reset(dest):
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'''
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Resets the index and working tree to HEAD.
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Discards any changes to tracked files in working
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tree since that commit.
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'''
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os.chdir(dest)
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cmd = "git reset --hard HEAD"
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cmd = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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(out, err) = cmd.communicate()
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rc = cmd.returncode
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return (rc, out, err)
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def pull(repo, dest):
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''' updates repo from remote sources '''
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os.chdir(dest)
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cmd = "git pull -u origin"
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cmd = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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return cmd.communicate()
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def switchver(version, dest):
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''' once pulled, switch to a particular SHA or tag '''
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os.chdir(dest)
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if version != 'HEAD':
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cmd = "git checkout %s --force" % version
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else:
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# is there a better way to do this?
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cmd = "git rebase origin"
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cmd = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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(out, err) = cmd.communicate()
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return (out, err)
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gitconfig = os.path.join(dest, '.git', 'config')
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out, err, status = (None, None, None)
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# if there is no git configuration, do a clone operation
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# else pull and switch the version
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before = None
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if not os.path.exists(gitconfig):
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(out, err) = clone(repo, dest)
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else:
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# else do a pull
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before = get_version(dest)
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(rc, out, err) = reset(dest)
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if rc != 0:
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fail_json(out=out, err=err)
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(out, err) = pull(repo, dest)
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# handle errors from clone or pull
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if out.find('error') != -1:
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fail_json(out=out, err=err)
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# switch to version specified regardless of whether
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# we cloned or pulled
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(out, err) = switchver(version, dest)
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if err.find('error') != -1:
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fail_json(out=out, err=err)
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# determine if we changed anything
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after = get_version(dest)
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changed = False
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if before != after:
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changed = True
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exit_json(changed=changed, before=before, after=after)
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