def rebase_branch(branch, parent, start_hash):
logging.debug('considering %s(%s) -> %s(%s) : %s',
branch, git.hash_one(branch), parent, git.hash_one(parent),
start_hash)
# If parent has FROZEN commits, don't base branch on top of them. Instead,
# base branch on top of whatever commit is before them.
back_ups = 0
orig_parent = parent
while git.run('log', '-n1', '--format=%s',
parent, '--').startswith(git.FREEZE):
back_ups += 1
parent = git.run('rev-parse', parent+'~')
if back_ups:
logging.debug('Backed parent up by %d from %s to %s',
back_ups, orig_parent, parent)
if git.hash_one(parent) != start_hash:
# Try a plain rebase first
print 'Rebasing:', branch
rebase_ret = git.rebase(parent, start_hash, branch, abort=True)
if not rebase_ret.success:
# TODO(iannucci): Find collapsible branches in a smarter way?
print "Failed! Attempting to squash", branch, "...",
squash_branch = branch+"_squash_attempt"
git.run('checkout', '-b', squash_branch)
git.squash_current_branch(merge_base=start_hash)
# Try to rebase the branch_squash_attempt branch to see if it's empty.
squash_ret = git.rebase(parent, start_hash, squash_branch, abort=True)
empty_rebase = git.hash_one(squash_branch) == git.hash_one(parent)
git.run('checkout', branch)
git.run('branch', '-D', squash_branch)
if squash_ret.success and empty_rebase:
print 'Success!'
git.squash_current_branch(merge_base=start_hash)
git.rebase(parent, start_hash, branch)
else:
print "Failed!"
print
# rebase and leave in mid-rebase state.
# This second rebase attempt should always fail in the same
# way that the first one does. If it magically succeeds then
# something very strange has happened.
second_rebase_ret = git.rebase(parent, start_hash, branch)
if second_rebase_ret.success: # pragma: no cover
print "Second rebase succeeded unexpectedly!"
print "Please see: http://crbug.com/425696"
print "First rebased failed with:"
print rebase_ret.stderr
else:
print "Here's what git-rebase (squashed) had to say:"
print
print squash_ret.stdout
print squash_ret.stderr
print textwrap.dedent(
"""\
Squashing failed. You probably have a real merge conflict.
Your working copy is in mid-rebase. Either:
* completely resolve like a normal git-rebase; OR
* abort the rebase and mark this branch as dormant:
git config branch.%s.dormant true
And then run `git rebase-update` again to resume.
""" % branch)
return False
else:
print '%s up-to-date' % branch
git.remove_merge_base(branch)
git.get_or_create_merge_base(branch)
return True
def rebase_branch(branch, parent, start_hash):
logging.debug('considering %s(%s) -> %s(%s) : %s', branch,
git.hash_one(branch), parent, git.hash_one(parent),
start_hash)
# If parent has FROZEN commits, don't base branch on top of them. Instead,
# base branch on top of whatever commit is before them.
back_ups = 0
orig_parent = parent
while git.run('log', '-n1', '--format=%s', parent,
'--').startswith(git.FREEZE):
back_ups += 1
parent = git.run('rev-parse', parent + '~')
if back_ups:
logging.debug('Backed parent up by %d from %s to %s', back_ups,
orig_parent, parent)
if git.hash_one(parent) != start_hash:
# Try a plain rebase first
print 'Rebasing:', branch
rebase_ret = git.rebase(parent, start_hash, branch, abort=True)
if not rebase_ret.success:
# TODO(iannucci): Find collapsible branches in a smarter way?
print "Failed! Attempting to squash", branch, "...",
squash_branch = branch + "_squash_attempt"
git.run('checkout', '-b', squash_branch)
git.squash_current_branch(merge_base=start_hash)
# Try to rebase the branch_squash_attempt branch to see if it's empty.
squash_ret = git.rebase(parent,
start_hash,
squash_branch,
abort=True)
empty_rebase = git.hash_one(squash_branch) == git.hash_one(parent)
git.run('checkout', branch)
git.run('branch', '-D', squash_branch)
if squash_ret.success and empty_rebase:
print 'Success!'
git.squash_current_branch(merge_base=start_hash)
git.rebase(parent, start_hash, branch)
else:
print "Failed!"
print
# rebase and leave in mid-rebase state.
# This second rebase attempt should always fail in the same
# way that the first one does. If it magically succeeds then
# something very strange has happened.
second_rebase_ret = git.rebase(parent, start_hash, branch)
if second_rebase_ret.success: # pragma: no cover
print "Second rebase succeeded unexpectedly!"
print "Please see: http://crbug.com/425696"
print "First rebased failed with:"
print rebase_ret.stderr
else:
print "Here's what git-rebase (squashed) had to say:"
print
print squash_ret.stdout
print squash_ret.stderr
print textwrap.dedent("""\
Squashing failed. You probably have a real merge conflict.
Your working copy is in mid-rebase. Either:
* completely resolve like a normal git-rebase; OR
* abort the rebase and mark this branch as dormant:
git config branch.%s.dormant true
And then run `git rebase-update` again to resume.
""" % branch)
return False
else:
print '%s up-to-date' % branch
git.remove_merge_base(branch)
git.get_or_create_merge_base(branch)
return True