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Avoid unnecessary git symbolic-ref calls during repo sync

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If the m/BRANCH ref is already pointing at the value set in the
manifest there is no reason to set it again.  Leave it alone,
thus saving a full fork+exec call.

Signed-off-by: Shawn O. Pearce <sop@google.com>
This commit is contained in:
Shawn O. Pearce 2009-04-17 20:32:44 -07:00
parent c12c360f89
commit 0f3dd233ec
2 changed files with 18 additions and 5 deletions
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14
git_refs.py
View File

@ -31,8 +31,7 @@ class GitRefs(object):
@property
def all(self):
if self._phyref is None or self._NeedUpdate():
self._LoadAll()
self._EnsureLoaded()
return self._phyref
def get(self, name):
@ -52,6 +51,17 @@ class GitRefs(object):
if name in self._mtime:
del self._mtime[name]
def symref(self, name):
try:
self._EnsureLoaded()
return self._symref[name]
except KeyError:
return ''
def _EnsureLoaded(self):
if self._phyref is None or self._NeedUpdate():
self._LoadAll()
def _NeedUpdate(self):
for name, mtime in self._mtime.iteritems():
try:

9
project.py
View File

@ -997,14 +997,17 @@ class Project(object):
if self.manifest.branch:
msg = 'manifest set to %s' % self.revision
ref = R_M + self.manifest.branch
cur = self.bare_ref.symref(ref)
if IsId(self.revision):
dst = self.revision + '^0'
self.bare_git.UpdateRef(ref, dst, message = msg, detach = True)
if cur != '' or self.bare_ref.get(ref) != self.revision:
dst = self.revision + '^0'
self.bare_git.UpdateRef(ref, dst, message = msg, detach = True)
else:
remote = self.GetRemote(self.remote.name)
dst = remote.ToLocal(self.revision)
self.bare_git.symbolic_ref('-m', msg, ref, dst)
if cur != dst:
self.bare_git.symbolic_ref('-m', msg, ref, dst)
def _InitMirrorHead(self):
dst = self.GetRemote(self.remote.name).ToLocal(self.revision)