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ansible/library/source_control/git
Christian Goetze f41d4ac390 Add support for bare git reference repos 
This adds two parameters to the git module:

  bare (boolean)
    Indicates this is to be a bare repositori

  reference (string)
    Indicates the path or url to the reference repo.
    Check out the "--reference" option in the "git clone"
    man page

Added appropriate tests.
2013-10-31 10:56:14 -07:00

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# (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/>.
DOCUMENTATION = '''
---
module: git
author: Michael DeHaan
version_added: "0.0.1"
short_description: Deploy software (or files) from git checkouts
description:
- Manage I(git) checkouts of repositories to deploy files or software.
options:
repo:
required: true
aliases: [ name ]
description:
- git, SSH, or HTTP protocol address of the git repository.
dest:
required: true
description:
- Absolute path of where the repository should be checked out to.
version:
required: false
default: "HEAD"
description:
- What version of the repository to check out. This can be the
full 40-character I(SHA-1) hash, the literal string C(HEAD), a
branch name, or a tag name.
reference:
required: false
default: null
version_added: "1.4"
description:
- Reference repository (see "git clone --reference ...")
remote:
required: false
default: "origin"
description:
- Name of the remote.
force:
required: false
default: "yes"
choices: [ "yes", "no" ]
version_added: "0.7"
description:
- If C(yes), any modified files in the working
repository will be discarded. Prior to 0.7, this was always
'yes' and could not be disabled.
depth:
required: false
default: null
version_added: "1.2"
description:
- Create a shallow clone with a history truncated to the specified
number or revisions. The minimum possible value is C(1), otherwise
ignored.
update:
required: false
default: "yes"
choices: [ "yes", "no" ]
version_added: "1.2"
description:
- If C(yes), repository will be updated using the supplied
remote. Otherwise the repo will be left untouched.
Prior to 1.2, this was always 'yes' and could not be disabled.
executable:
required: false
default: null
version_added: "1.4"
description:
- Path to git executable to use. If not supplied,
the normal mechanism for resolving binary paths will be used.
bare:
required: false
default: "no"
choices: [ "yes", "no" ]
version_added: "1.4"
description:
- if C(yes), repository will be created as a bare repo, otherwise
it will be a standard repo with a workspace.
notes:
- If the task seems to be hanging, first verify remote host is in C(known_hosts).
SSH will prompt user to authorize the first contact with a remote host. One solution is to add
C(StrictHostKeyChecking no) in C(.ssh/config) which will accept and authorize the connection
on behalf of the user. However, if you run as a different user such as setting sudo to True),
for example, root will not look at the user .ssh/config setting.
'''
EXAMPLES = '''
# Example git checkout from Ansible Playbooks
- git: repo=git://foosball.example.org/path/to/repo.git
dest=/srv/checkout
version=release-0.22
# Example read-write git checkout from github
- git: repo=ssh://git@github.com/mylogin/hello.git dest=/home/mylogin/hello
# Example just ensuring the repo checkout exists
- git: repo=git://foosball.example.org/path/to/repo.git dest=/srv/checkout update=no
'''
import re
import tempfile
def get_version(git_path, dest, ref="HEAD"):
''' samples the version of the git repo '''
os.chdir(dest)
cmd = "%s rev-parse %s" % (git_path, ref)
sha = os.popen(cmd).read().rstrip("\n")
return sha
def clone(git_path, module, repo, dest, remote, depth, version, bare, reference):
''' makes a new git repo if it does not already exist '''
dest_dirname = os.path.dirname(dest)
try:
os.makedirs(dest_dirname)
except:
pass
os.chdir(dest_dirname)
cmd = [ git_path, 'clone' ]
if bare:
cmd.append('--bare')
else:
cmd.extend([ '--origin', remote, '--recursive' ])
if is_remote_branch(git_path, module, dest, repo, version) \
or is_remote_tag(git_path, module, dest, repo, version):
cmd.extend([ '--branch', version ])
if depth:
cmd.extend([ '--depth', str(depth) ])
if reference:
cmd.extend([ '--reference', str(reference) ])
cmd.extend([ repo, dest ])
module.run_command(cmd, check_rc=True)
if bare:
os.chdir(dest)
if remote != 'origin':
module.run_command([git_path, 'remote', 'add', remote, repo], check_rc=True)
def has_local_mods(git_path, dest, bare):
if bare:
return False
os.chdir(dest)
cmd = "%s status -s" % (git_path,)
lines = os.popen(cmd).read().splitlines()
lines = filter(lambda c: not re.search('^\\?\\?.*$', c), lines)
return len(lines) > 0
def reset(git_path, module, 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 = "%s reset --hard HEAD" % (git_path,)
return module.run_command(cmd, check_rc=True)
def get_remote_head(git_path, module, dest, version, remote, bare):
cloning = False
if remote == module.params['repo']:
cloning = True
else:
os.chdir(dest)
if version == 'HEAD':
if cloning:
# cloning the repo, just get the remote's HEAD version
cmd = '%s ls-remote %s -h HEAD' % (git_path, remote)
else:
head_branch = get_head_branch(git_path, module, dest, remote, bare)
cmd = '%s ls-remote %s -h refs/heads/%s' % (git_path, remote, head_branch)
elif is_remote_branch(git_path, module, dest, remote, version):
cmd = '%s ls-remote %s -h refs/heads/%s' % (git_path, remote, version)
elif is_remote_tag(git_path, module, dest, remote, version):
cmd = '%s ls-remote %s -t refs/tags/%s' % (git_path, remote, version)
else:
# appears to be a sha1. return as-is since it appears
# cannot check for a specific sha1 on remote
return version
(rc, out, err) = module.run_command(cmd, check_rc=True)
if len(out) < 1:
module.fail_json(msg="Could not determine remote revision for %s" % version)
rev = out.split()[0]
return rev
def is_remote_tag(git_path, module, dest, remote, version):
cmd = '%s ls-remote %s -t refs/tags/%s' % (git_path, remote, version)
(rc, out, err) = module.run_command(cmd, check_rc=True)
if version in out:
return True
else:
return False
def get_branches(git_path, module, dest):
os.chdir(dest)
branches = []
cmd = '%s branch -a' % (git_path,)
(rc, out, err) = module.run_command(cmd)
if rc != 0:
module.fail_json(msg="Could not determine branch data - received %s" % out)
for line in out.split('\n'):
branches.append(line.strip())
return branches
def is_remote_branch(git_path, module, dest, remote, version):
cmd = '%s ls-remote %s -h refs/heads/%s' % (git_path, remote, version)
(rc, out, err) = module.run_command(cmd, check_rc=True)
if version in out:
return True
else:
return False
def is_local_branch(git_path, module, dest, branch):
branches = get_branches(git_path, module, dest)
lbranch = '%s' % branch
if lbranch in branches:
return True
elif '* %s' % branch in branches:
return True
else:
return False
def is_not_a_branch(git_path, module, dest):
branches = get_branches(git_path, module, dest)
for b in branches:
if b.startswith('* ') and 'no branch' in b:
return True
return False
def get_head_branch(git_path, module, dest, remote, bare=False):
'''
Determine what branch HEAD is associated with. This is partly
taken from lib/ansible/utils/__init__.py. It finds the correct
path to .git/HEAD and reads from that file the branch that HEAD is
associated with. In the case of a detached HEAD, this will look
up the branch in .git/refs/remotes/<remote>/HEAD.
'''
if bare:
repo_path = dest
else:
repo_path = os.path.join(dest, '.git')
# Check if the .git is a file. If it is a file, it means that we are in a submodule structure.
if os.path.isfile(repo_path):
try:
gitdir = yaml.safe_load(open(repo_path)).get('gitdir')
# There is a posibility the .git file to have an absolute path.
if os.path.isabs(gitdir):
repo_path = gitdir
else:
repo_path = os.path.join(repo_path.split('.git')[0], gitdir)
except (IOError, AttributeError):
return ''
# Read .git/HEAD for the name of the branch.
# If we're in a detached HEAD state, look up the branch associated with
# the remote HEAD in .git/refs/remotes/<remote>/HEAD
f = open(os.path.join(repo_path, "HEAD"))
if is_not_a_branch(git_path, module, dest):
f.close()
f = open(os.path.join(repo_path, 'refs', 'remotes', remote, 'HEAD'))
branch = f.readline().split('/')[-1].rstrip("\n")
f.close()
return branch
def fetch(git_path, module, repo, dest, version, remote, bare):
''' updates repo from remote sources '''
os.chdir(dest)
if bare:
(rc, out1, err1) = module.run_command([git_path, 'fetch', remote, '+refs/heads/*:refs/heads/*'])
else:
(rc, out1, err1) = module.run_command("%s fetch %s" % (git_path, remote))
if rc != 0:
module.fail_json(msg="Failed to download remote objects and refs")
if bare:
(rc, out2, err2) = module.run_command([git_path, 'fetch', remote, '+refs/tags/*:refs/tags/*'])
else:
(rc, out2, err2) = module.run_command("%s fetch --tags %s" % (git_path, remote))
if rc != 0:
module.fail_json(msg="Failed to download remote objects and refs")
(rc, out3, err3) = submodule_update(git_path, module, dest)
return (rc, out1 + out2 + out3, err1 + err2 + err3)
def submodule_update(git_path, module, dest):
''' init and update any submodules '''
os.chdir(dest)
# skip submodule commands if .gitmodules is not present
if not os.path.exists(os.path.join(dest, '.gitmodules')):
return (0, '', '')
cmd = [ git_path, 'submodule', 'sync' ]
(rc, out, err) = module.run_command(cmd, check_rc=True)
cmd = [ git_path, 'submodule', 'update', '--init', '--recursive' ]
(rc, out, err) = module.run_command(cmd)
if rc != 0:
module.fail_json(msg="Failed to init/update submodules")
return (rc, out, err)
def switch_version(git_path, module, dest, remote, version):
''' once pulled, switch to a particular SHA, tag, or branch '''
os.chdir(dest)
cmd = ''
if version != 'HEAD':
if is_remote_branch(git_path, module, dest, remote, version):
if not is_local_branch(git_path, module, dest, version):
cmd = "%s checkout --track -b %s %s/%s" % (git_path, version, remote, version)
else:
(rc, out, err) = module.run_command("%s checkout --force %s" % (git_path, version))
if rc != 0:
module.fail_json(msg="Failed to checkout branch %s" % version)
cmd = "%s reset --hard %s/%s" % (git_path, remote, version)
else:
cmd = "%s checkout --force %s" % (git_path, version)
else:
branch = get_head_branch(git_path, module, dest, remote)
(rc, out, err) = module.run_command("%s checkout --force %s" % (git_path, branch))
if rc != 0:
module.fail_json(msg="Failed to checkout branch %s" % branch)
cmd = "%s reset --hard %s" % (git_path, remote)
(rc, out1, err1) = module.run_command(cmd)
if rc != 0:
if version != 'HEAD':
module.fail_json(msg="Failed to checkout %s" % (version))
else:
module.fail_json(msg="Failed to checkout branch %s" % (branch))
(rc, out2, err2) = submodule_update(git_path, module, dest)
return (rc, out1 + out2, err1 + err2)
# ===========================================
def main():
module = AnsibleModule(
argument_spec = dict(
dest=dict(required=True),
repo=dict(required=True, aliases=['name']),
version=dict(default='HEAD'),
remote=dict(default='origin'),
reference=dict(default=None),
force=dict(default='yes', type='bool'),
depth=dict(default=None, type='int'),
update=dict(default='yes', type='bool'),
executable=dict(default=None),
bare=dict(default='no', type='bool'),
),
supports_check_mode=True
)
dest = os.path.abspath(os.path.expanduser(module.params['dest']))
repo = module.params['repo']
version = module.params['version']
remote = module.params['remote']
force = module.params['force']
depth = module.params['depth']
update = module.params['update']
bare = module.params['bare']
reference = module.params['reference']
git_path = module.params['executable'] or module.get_bin_path('git', True)
if bare:
gitconfig = os.path.join(dest, 'config')
else:
gitconfig = os.path.join(dest, '.git', 'config')
rc, out, err, status = (0, None, None, None)
# if there is no git configuration, do a clone operation
# else pull and switch the version
before = None
local_mods = False
if not os.path.exists(gitconfig):
if module.check_mode:
remote_head = get_remote_head(git_path, module, dest, version, repo)
module.exit_json(changed=True, before=before, after=remote_head)
clone(git_path, module, repo, dest, remote, depth, version, bare, reference)
elif not update:
# Just return having found a repo already in the dest path
# this does no checking that the repo is the actual repo
# requested.
before = get_version(git_path, dest)
module.exit_json(changed=False, before=before, after=before)
else:
# else do a pull
local_mods = has_local_mods(git_path, dest, bare)
before = get_version(git_path, dest)
if local_mods:
# failure should happen regardless of check mode
if not force:
module.fail_json(msg="Local modifications exist in repository (force=no).")
# if force and in non-check mode, do a reset
if not module.check_mode:
reset(git_path, module, dest)
# exit if already at desired sha version
remote_head = get_remote_head(git_path, module, dest, version, remote, bare)
if before == remote_head:
if local_mods:
module.exit_json(changed=True, before=before, after=remote_head,
msg="Local modifications exist")
else:
module.exit_json(changed=False, before=before, after=remote_head)
if module.check_mode:
module.exit_json(changed=True, before=before, after=remote_head)
fetch(git_path, module, repo, dest, version, remote, bare)
# switch to version specified regardless of whether
# we cloned or pulled
if not bare:
switch_version(git_path, module, dest, remote, version)
# determine if we changed anything
after = get_version(git_path, dest)
changed = False
if before != after or local_mods:
changed = True
module.exit_json(changed=changed, before=before, after=after)
# include magic from lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()
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