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# Copyright (C) 2010 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import re
import sys
from command import Command
from error import GitError
from git_command import GitCommand
CHANGE_ID_RE = re.compile(r"^\s*Change-Id: I([0-9a-f]{40})\s*$")
class CherryPick(Command):
COMMON = True
helpSummary = "Cherry-pick a change."
helpUsage = """
%prog <sha1>
"""
helpDescription = """
'%prog' cherry-picks a change from one branch to another.
The change id will be updated, and a reference to the old
change id will be added.
"""
def ValidateOptions(self, opt, args):
if len(args) != 1:
self.Usage()
def Execute(self, opt, args):
reference = args[0]
p = GitCommand(
None,
["rev-parse", "--verify", reference],
capture_stdout=True,
capture_stderr=True,
verify_command=True,
)
try:
p.Wait()
except GitError:
print(p.stderr, file=sys.stderr)
raise
sha1 = p.stdout.strip()
p = GitCommand(
None,
["cat-file", "commit", sha1],
capture_stdout=True,
verify_command=True,
)
try:
p.Wait()
except GitError:
print(
"error: Failed to retrieve old commit message", file=sys.stderr
)
raise
old_msg = self._StripHeader(p.stdout)
p = GitCommand(
None,
["cherry-pick", sha1],
capture_stdout=True,
capture_stderr=True,
verify_command=True,
)
try:
p.Wait()
except GitError as e:
print(str(e))
print(
"NOTE: When committing (please see above) and editing the "
"commit message, please remove the old Change-Id-line and "
"add:"
)
print(self._GetReference(sha1), file=sys.stderr)
print(file=sys.stderr)
raise
if p.stdout:
print(p.stdout.strip(), file=sys.stdout)
if p.stderr:
print(p.stderr.strip(), file=sys.stderr)
# The cherry-pick was applied correctly. We just need to edit
# the commit message.
new_msg = self._Reformat(old_msg, sha1)
p = GitCommand(
None,
["commit", "--amend", "-F", "-"],
input=new_msg,
capture_stdout=True,
capture_stderr=True,
verify_command=True,
)
try:
p.Wait()
except GitError:
print(
"error: Failed to update commit message",
file=sys.stderr,
)
raise
def _IsChangeId(self, line):
return CHANGE_ID_RE.match(line)
def _GetReference(self, sha1):
return "(cherry picked from commit %s)" % sha1
def _StripHeader(self, commit_msg):
lines = commit_msg.splitlines()
return "\n".join(lines[lines.index("") + 1 :])
def _Reformat(self, old_msg, sha1):
new_msg = []
for line in old_msg.splitlines():
if not self._IsChangeId(line):
new_msg.append(line)
# Add a blank line between the message and the change id/reference.
try:
if new_msg[-1].strip() != "":
new_msg.append("")
except IndexError:
pass
new_msg.append(self._GetReference(sha1))
return "\n".join(new_msg)
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