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Don't reset the local repo

Instead of "resetting" the local repo (git remote update,
git checkout master, git reset --hard, git clean -xfdq) before
merging each change, just fetch the remote ref for the branch
and check that out (as a detached head).  Or, if we are merging
a change that depends on another change in the queue, just check
that change out.

Change-Id: I0a9b839a0c75c04eca7393d7bb58cf89448b6494
changes/92/43792/3
James E. Blair 9 years ago
parent
commit
96ee718c4b
  1. 41
      zuul/merger.py

41
zuul/merger.py

@ -60,29 +60,18 @@ class Repo(object):
self._ensure_cloned()
self.repo = git.Repo(self.local_path)
def reset(self):
self._ensure_cloned()
self.log.debug("Resetting repository %s" % self.local_path)
self.update()
origin = self.repo.remotes.origin
for ref in origin.refs:
if ref.remote_head == 'HEAD':
continue
self.repo.create_head(ref.remote_head, ref, force=True)
# Reset to remote HEAD (usually origin/master)
self.repo.head.reference = origin.refs['HEAD']
self.repo.head.reset(index=True, working_tree=True)
self.repo.git.clean('-x', '-f', '-d')
def getBranchHead(self, branch):
return self.repo.heads[branch]
def checkout(self, ref):
self._ensure_cloned()
self.log.debug("Checking out %s" % ref)
self.repo.head.reference = ref
self.log.debug(repr(ref))
if self.repo.re_hexsha_only.match(ref):
self.repo.head.reference = ref
else:
self.fetch(ref)
self.repo.head.reference = \
self.repo.remotes.origin.refs[ref].commit.hexsha
self.repo.head.reset(index=True, working_tree=True)
self.repo.git.clean('-x', '-f', '-d')
def cherryPick(self, ref):
self._ensure_cloned()
@ -107,15 +96,15 @@ class Repo(object):
# data was fetched properly subsequent fetches don't seem to fail.
# So try again if an AssertionError is caught.
origin = self.repo.remotes.origin
self.log.debug("Fetching %s" % ref)
try:
origin.fetch(ref)
except AssertionError:
origin.fetch(ref)
# If the repository is packed, and we fetch a change that is
# also entirely packed, the cache may be out of date for the
# same reason as reset() above. Avoid these problems by
# recreating the repo object.
# also entirely packed, the cache may be out of date.
# See the comment in update() and
# https://bugs.launchpad.net/zuul/+bug/1078946
self.repo = git.Repo(self.local_path)
@ -250,14 +239,8 @@ class Merger(object):
# Only current change to merge against tip of change.branch
if len(sibling_items) == 1:
repo = self.getRepo(item.change.project)
# we need to reset here in order to call getBranchHead
try:
repo.reset()
except:
self.log.exception("Unable to reset repo %s" % repo)
return False
commit = self._mergeChange(item.change,
repo.getBranchHead(item.change.branch),
item.change.branch,
target_ref=target_ref)
# Sibling changes exist. Merge current change against newest sibling.
elif (len(sibling_items) >= 2 and

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