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ansible/library/git

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