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# Copyright (C) 2007 Canonical Ltd
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""The model for interacting with the git process, etc."""
import os
import subprocess
import tarfile
from bzrlib.plugins.git import errors
class GitModel(object):
"""API that follows GIT model closely"""
def __init__(self, git_dir):
self.git_dir = git_dir
def git_command(self, command, args):
return ['git', command] + args
def git_lines(self, command, args):
cmd = self.git_command(command, args)
env = os.environ.copy()
env['GIT_DIR'] = self.git_dir
p = subprocess.Popen(cmd,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
env=env)
lines = p.stdout.readlines()
if p.wait() != 0:
raise errors.GitCommandError(cmd, p.returncode,
p.stderr.read().strip())
return lines
def git_line(self, command, args):
lines = self.git_lines(command, args)
return lines[0]
def cat_file(self, type, object_id, pretty=False):
args = []
if pretty:
args.append('-p')
else:
args.append(type)
args.append(object_id)
return self.git_lines('cat-file', args)
def rev_list(self, heads, max_count=None, header=False, parents=False,
topo_order=False, paths=None):
args = []
if max_count is not None:
args.append('--max-count=%d' % max_count)
if header:
args.append('--header')
if parents:
args.append('--parents')
if topo_order:
args.append('--topo-order')
if heads is None:
args.append('--all')
else:
args.extend(heads)
if paths is not None:
args.append('--')
args.extend(paths)
return self.git_lines('rev-list', args)
def rev_parse(self, git_id):
args = ['--verify', git_id]
return self.git_line('rev-parse', args).strip()
def get_head(self):
try:
return self.rev_parse('HEAD')
except errors.GitCommandError, e:
# Most likely, this is a null branch, so treat it as such
if e.stderr == 'fatal: Needed a single revision':
return None
raise
def get_revision_graph(self, revisions):
ancestors = {}
for line in self.rev_list(revisions, parents=True):
entries = line.split()
ancestors[entries[0]] = entries[1:]
return ancestors
def get_ancestry(self, revisions):
args = ['--topo-order', '--reverse'] + revisions
return [line[:-1] for line in self.git_lines('rev-list', args)]
def ancestor_lines(self, revisions):
revision_lines = []
for line in self.rev_list(revisions, header=True):
if line.startswith('\x00'):
yield revision_lines
revision_lines = [line[1:].decode('latin-1')]
else:
revision_lines.append(line.decode('latin-1'))
assert revision_lines == ['']
def get_inventory(self, tree_id):
for line in self.git_lines('ls-tree', ['-r', '-t', tree_id]):
# Ideally, we would use -z so we would not have to handle escaped
# file names. But then we could not use readlines() to split the
# data as it is read.
permissions, type, hash_and_path = line.split(' ', 2)
hash, name = hash_and_path.split('\t', 1)
name = name[:-1] # strip trailing newline
if name.startswith('"'):
name = name[1:-1].decode('string_escape')
name = name.decode('utf-8')
yield permissions, type, hash, name
def get_tarpipe(self, tree_id):
cmd = self.git_command('archive', [tree_id])
env = os.environ.copy()
env['GIT_DIR'] = self.git_dir
p = subprocess.Popen(cmd,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
env=env)
p.stdin.close()
tarpipe = TarPipe.open(mode='r|', fileobj=p.stdout)
def close_callback():
if p.wait() != 0:
raise errors.GitCommandError(cmd, p.returncode,
p.stderr.read().strip())
tarpipe.set_close_callback(close_callback)
return tarpipe
class TarPipe(tarfile.TarFile):
def set_close_callback(self, close_callback):
self.__close_callback = close_callback
def close(self):
super(TarPipe, self).close()
self.__close_callback()
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