mirror of
https://gerrit.googlesource.com/git-repo
synced 2024-12-21 07:16:21 +00:00
fbcde472ca
By resolving the current HEAD and the manifest revision using pure Python, we can in the common case of "no changes" avoid a lot of git operations and directly jump out of the local sync method. This reduces the no-op `repo sync -l` time for Android's 114 projects from more than 6s to under 0.8s. Signed-off-by: Shawn O. Pearce <sop@google.com>
145 lines
3.4 KiB
Python
145 lines
3.4 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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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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R_M = 'refs/remotes/m/'
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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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if self._phyref is None or self._NeedUpdate():
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self._LoadAll()
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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 _NeedUpdate(self):
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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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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, 'r')
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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, 'r')
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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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