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cc6c79643e
I plan to have the new submodule manifest format use a different layout for the m refs than the XML manifest format has used in the past. Thus we need to move the behavior management into the manifest object, and out of the project, so we can change it. Signed-off-by: Shawn O. Pearce <sop@google.com>
160 lines
3.6 KiB
Python
160 lines
3.6 KiB
Python
#
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# Copyright (C) 2009 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import sys
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from trace import Trace
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HEAD = 'HEAD'
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R_HEADS = 'refs/heads/'
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R_TAGS = 'refs/tags/'
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R_PUB = 'refs/published/'
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class GitRefs(object):
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def __init__(self, gitdir):
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self._gitdir = gitdir
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self._phyref = None
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self._symref = None
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self._mtime = {}
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@property
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def all(self):
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self._EnsureLoaded()
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return self._phyref
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def get(self, name):
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try:
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return self.all[name]
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except KeyError:
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return ''
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def deleted(self, name):
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if self._phyref is not None:
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if name in self._phyref:
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del self._phyref[name]
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if name in self._symref:
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del self._symref[name]
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if name in self._mtime:
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del self._mtime[name]
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def symref(self, name):
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try:
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self._EnsureLoaded()
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return self._symref[name]
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except KeyError:
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return ''
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def _EnsureLoaded(self):
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if self._phyref is None or self._NeedUpdate():
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self._LoadAll()
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def _NeedUpdate(self):
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Trace(': scan refs %s', self._gitdir)
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for name, mtime in self._mtime.iteritems():
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try:
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if mtime != os.path.getmtime(os.path.join(self._gitdir, name)):
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return True
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except OSError:
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return True
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return False
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def _LoadAll(self):
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Trace(': load refs %s', self._gitdir)
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self._phyref = {}
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self._symref = {}
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self._mtime = {}
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self._ReadPackedRefs()
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self._ReadLoose('refs/')
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self._ReadLoose1(os.path.join(self._gitdir, HEAD), HEAD)
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scan = self._symref
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attempts = 0
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while scan and attempts < 5:
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scan_next = {}
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for name, dest in scan.iteritems():
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if dest in self._phyref:
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self._phyref[name] = self._phyref[dest]
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else:
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scan_next[name] = dest
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scan = scan_next
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attempts += 1
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def _ReadPackedRefs(self):
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path = os.path.join(self._gitdir, 'packed-refs')
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try:
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fd = open(path, 'rb')
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mtime = os.path.getmtime(path)
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except IOError:
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return
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except OSError:
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return
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try:
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for line in fd:
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if line[0] == '#':
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continue
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if line[0] == '^':
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continue
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line = line[:-1]
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p = line.split(' ')
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id = p[0]
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name = p[1]
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self._phyref[name] = id
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finally:
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fd.close()
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self._mtime['packed-refs'] = mtime
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def _ReadLoose(self, prefix):
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base = os.path.join(self._gitdir, prefix)
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for name in os.listdir(base):
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p = os.path.join(base, name)
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if os.path.isdir(p):
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self._mtime[prefix] = os.path.getmtime(base)
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self._ReadLoose(prefix + name + '/')
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elif name.endswith('.lock'):
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pass
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else:
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self._ReadLoose1(p, prefix + name)
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def _ReadLoose1(self, path, name):
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try:
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fd = open(path, 'rb')
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mtime = os.path.getmtime(path)
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except OSError:
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return
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except IOError:
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return
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try:
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id = fd.readline()
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finally:
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fd.close()
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if not id:
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return
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id = id[:-1]
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if id.startswith('ref: '):
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self._symref[name] = id[5:]
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else:
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self._phyref[name] = id
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self._mtime[name] = mtime
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