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ansible/library/git

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#!/usr/bin/python
# 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 sys
import shlex
import subprocess
# ===========================================
# convert arguments of form a=b c=d
# to a dictionary
# FIXME: make more idiomatic
args = " ".join(sys.argv[1:])
items = shlex.split(args)
params = {}
for x in items:
(k, v) = x.split("=")
params[k] = v
dest = params['dest']
repo = params['repo']
version = params['version']
# ===========================================
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):
''' 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)
return cmd.communicate()
def pull(repo, dest):
''' updates repo from remote sources '''
os.chdir(dest)
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)
else:
# else do a pull
before = get_version(dest)
(out, err) = pull(repo, dest)
# handle errors from clone or pull
if out.find('error') != -1:
print json.dumps({
"failed" : True,
"out" : out,
"err" : err
})
sys.exit(1)
# switch to version specified regardless of whether
# we cloned or pulled
(out, err) = switchver(version, dest)
if err.find('error') != -1:
print json.dumps({
"failed" : True,
"out" : out,
"err" : err
})
sys.exit(1)
# determine if we changed anything
after = get_version(dest)
changed = False
if before != after:
changed = True
print json.dumps({
"changed" : changed,
"before" : before,
"after" : after
})