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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 cliapp
import os
import string
class RepositoryNotFoundError(cliapp.AppException):
def __init__(self, repo):
cliapp.AppException.__init__(
self, 'Repository %s does not exist in the cache' % repo)
class InvalidReferenceError(cliapp.AppException):
def __init__(self, repo, ref):
cliapp.AppException.__init__(
self, 'Ref %s is an invalid reference for repo %s' %
(ref, repo))
class UnresolvedNamedReferenceError(cliapp.AppException):
def __init__(self, repo, ref):
cliapp.AppException.__init__(
self, 'Ref %s is not a SHA1 ref for repo %s' %
(ref, repo))
class RepoCache(object):
def __init__(self, app, dirname):
self.app = app
self.dirname = dirname
def resolve_ref(self, repo_url, ref):
quoted_url = self._quote_url(repo_url)
repo_dir = os.path.join(self.dirname, quoted_url)
if not os.path.exists(repo_dir):
raise RepositoryNotFoundError(repo_url)
try:
refs = self._show_ref(repo_dir, ref).split('\n')
refs = [x.split() for x in refs if 'origin' in x]
return refs[0][0]
except cliapp.AppException:
pass
if not self._is_valid_sha1(ref):
raise InvalidReferenceError(repo_url, ref)
try:
return self._rev_list(ref).strip()
except:
raise InvalidReferenceError(repo_url, ref)
def cat_file(self, repo_url, ref, filename):
quoted_url = self._quote_url(repo_url)
repo_dir = os.path.join(self.dirname, quoted_url)
if not self._is_valid_sha1(ref):
raise UnresolvedNamedReferenceError(repo_url, ref)
if not os.path.exists(repo_dir):
raise RepositoryNotFoundError(repo_url)
try:
sha1 = self._rev_list(repo_dir, ref).strip()
except:
raise InvalidReferenceError(repo_url, ref)
return self._cat_file(repo_dir, sha1, filename)
def _quote_url(self, url):
valid_chars = string.digits + string.letters + '%_'
transl = lambda x: x if x in valid_chars else '_'
return ''.join([transl(x) for x in url])
def _show_ref(self, repo_dir, ref):
return self.app.runcmd(['git', 'show-ref', ref], cwd=repo_dir)
def _rev_list(self, repo_dir, ref):
return self.app.runcmd(
['git', 'rev-list', '--no-walk', ref], cwd=repo_dir)
def _cat_file(self, repo_dir, sha1, filename):
return self.app.runcmd(
['git', 'cat-file', 'blob', '%s:%s' % (sha1, filename)],
cwd=repo_dir)
def _is_valid_sha1(self, ref):
valid_chars = 'abcdefABCDEF0123456789'
return len(ref) == 40 and all([x in valid_chars for x in ref])
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