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# Copyright (C) 2012 Codethink Limited
#
# This program 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; version 2 of the License.
#
# This program 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 this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import os
import urlparse
import urllib2
import string
import morphlib
gitscheme=["git",]
urlparse.uses_relative.extend(gitscheme)
urlparse.uses_netloc.extend(gitscheme)
urlparse.uses_params.extend(gitscheme)
urlparse.uses_query.extend(gitscheme)
urlparse.uses_fragment.extend(gitscheme)
_valid_chars = string.digits + string.letters + ':%_'
def quote_url(url):
transl = lambda x: x if x in _valid_chars else '_'
return ''.join([transl(x) for x in url])
class RepositoryUpdateError(Exception):
def __init__(self, repo, ref):
Exception.__init__(self, 'No source found at %s:%s' % (repo, ref))
class SourceManager(object):
def __init__(self, app, cachedir=None, update=True):
self.real_msg = app.msg
self.settings = app.settings
self.cached_treeishes = {}
self.cache_dir = cachedir
self.update = update
if not self.cache_dir:
self.cache_dir = os.path.join(app.settings['cachedir'], 'gits')
self.indent = 0
def indent_more(self):
self.indent += 1
def indent_less(self):
self.indent -= 1
def msg(self, text):
spaces = ' ' * self.indent
self.real_msg('%s%s' % (spaces, text))
def _get_git_cache(self, repo):
name = quote_url(repo)
location = self.cache_dir + '/' + name
if os.path.exists(location):
if self.update:
self.msg('Cached clone exists, updating origin')
morphlib.git.update_remote(location, "origin", self.msg)
else: # pragma: no cover
self.msg('Cached clone exists, assuming origin is up to date')
return True, location
else:
self.msg('No cached clone found, fetching from %s' % repo)
success = False
bundle = None
if self.settings['bundle-server']:
bundle_server = self.settings['bundle-server']
if not bundle_server.endswith('/'):
bundle_server += '/'
self.msg('Using bundle server %s, looking for bundle for %s' %
(bundle_server, name))
bundle = name + ".bndl"
lookup_url = urlparse.urljoin(bundle_server, bundle)
self.msg('Checking for bundle %s' % lookup_url)
req = urllib2.Request(lookup_url)
try:
urllib2.urlopen(req)
self._wget(lookup_url)
bundle = self.cache_dir + '/' + bundle
except urllib2.URLError:
self.msg('Unable to find bundle %s on %s' %
(bundle, bundle_server))
bundle = None
try:
if bundle:
self.msg('Initialising repository at %s' % location)
morphlib.git.init(location, self.msg)
self.msg('Extracting bundle %s into %s' %
(bundle, location))
morphlib.git.extract_bundle(location, bundle, self.msg)
self.msg('Adding origin %s' % repo)
morphlib.git.add_remote(location,'origin', repo, self.msg)
else:
self.msg('Cloning %s into %s' % (repo, location))
morphlib.git.clone(location, repo, self.msg)
success = True
except morphlib.execute.CommandFailure:
success = False
return success, location
def _wget(self,url): # pragma: no cover
ex = morphlib.execute.Execute(self.cache_dir, msg=self.msg)
ex.runv(['wget', '-c', url])
def _cache_git_from_base_urls(self, repo, ref):
treeish = None
# try all base URLs to load the treeish
for base_url in self.settings['git-base-url']:
# generate the full repo URL
if not base_url.endswith('/'):
base_url += '/'
full_repo = urlparse.urljoin(base_url, repo)
self.msg('Updating repository %s' % quote_url(full_repo))
self.indent_more()
# try to clone/update the repo so that we can obtain a treeish
success, gitcache = self._get_git_cache(full_repo)
if success:
treeish = morphlib.git.Treeish(gitcache, repo, ref, self.msg)
self.indent_less()
break
self.indent_less()
if treeish:
return treeish
else:
raise RepositoryUpdateError(repo, ref)
def _resolve_submodules(self, treeish):
self.indent_more()
# resolve submodules
treeish.submodules = morphlib.git.Submodules(treeish, self.msg)
try:
# load submodules from .gitmodules
treeish.submodules.load()
# resolve the tree-ishes for all submodules recursively
for submodule in treeish.submodules: # pragma: no cover
submodule.treeish = self.get_treeish(submodule.url,
submodule.commit)
except morphlib.git.NoModulesFileError:
# this is not really an error, the repository simply
# does not specify any git submodules
pass
self.indent_less()
def get_treeish(self, repo, ref):
'''Returns a Treeish for a URL or repo name with a given reference.
If the source hasn't been cloned yet, this will fetch it, either using
clone or by fetching a bundle.
Raises morphlib.git.InvalidReferenceError if the reference cannot be
found. Raises morphlib.sourcemanager.RepositoryUpdateError if the
repository cannot be cloned or updated.
'''
if (repo, ref) not in self.cached_treeishes:
# load the corresponding treeish on demand
treeish = self._cache_git_from_base_urls(repo, ref)
# have a treeish now, cache it to avoid loading it twice
self.cached_treeishes[(repo, ref)] = treeish
# load tree-ishes for submodules, if necessary
self._resolve_submodules(treeish)
# we should now have a cached treeish to use now
return self.cached_treeishes[(repo, ref)]
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