mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 12:12:47 +01:00
a2114177f9
This makes git-llvm more of a thin wrapper around git while temporarily
maintaining backwards compatibility with past git-llvm behavior.
Using @{upstream} makes git-llvm more robust when used with a nontrivial
local repository.
https://reviews.llvm.org/D67389
llvm-svn: 372070
686 lines
24 KiB
Python
Executable File
686 lines
24 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# ======- git-llvm - LLVM Git Help Integration ---------*- python -*--========#
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#
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# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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# See https://llvm.org/LICENSE.txt for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#
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# ==------------------------------------------------------------------------==#
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"""
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git-llvm integration
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====================
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This file provides integration for git.
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"""
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from __future__ import print_function
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import argparse
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import collections
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import os
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import re
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import shutil
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import subprocess
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import sys
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import time
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assert sys.version_info >= (2, 7)
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try:
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dict.iteritems
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except AttributeError:
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# Python 3
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def iteritems(d):
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return iter(d.items())
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else:
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# Python 2
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def iteritems(d):
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return d.iteritems()
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try:
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# Python 3
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from shlex import quote
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except ImportError:
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# Python 2
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from pipes import quote
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# It's *almost* a straightforward mapping from the monorepo to svn...
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LLVM_MONOREPO_SVN_MAPPING = {
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d: (d + '/trunk')
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for d in [
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'clang-tools-extra',
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'compiler-rt',
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'debuginfo-tests',
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'dragonegg',
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'klee',
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'libc',
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'libclc',
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'libcxx',
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'libcxxabi',
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'libunwind',
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'lld',
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'lldb',
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'llgo',
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'llvm',
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'openmp',
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'parallel-libs',
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'polly',
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'pstl',
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]
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}
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LLVM_MONOREPO_SVN_MAPPING.update({'clang': 'cfe/trunk'})
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LLVM_MONOREPO_SVN_MAPPING.update({'': 'monorepo-root/trunk'})
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SPLIT_REPO_NAMES = {'llvm-' + d: d + '/trunk'
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for d in ['www', 'zorg', 'test-suite', 'lnt']}
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VERBOSE = False
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QUIET = False
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dev_null_fd = None
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def eprint(*args, **kwargs):
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print(*args, file=sys.stderr, **kwargs)
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def log(*args, **kwargs):
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if QUIET:
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return
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print(*args, **kwargs)
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def log_verbose(*args, **kwargs):
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if not VERBOSE:
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return
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print(*args, **kwargs)
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def die(msg):
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eprint(msg)
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sys.exit(1)
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def ask_confirm(prompt):
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# Python 2/3 compatibility
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try:
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read_input = raw_input
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except NameError:
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read_input = input
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while True:
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query = read_input('%s (y/N): ' % (prompt))
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if query.lower() not in ['y','n', '']:
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print('Expect y or n!')
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continue
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return query.lower() == 'y'
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def split_first_path_component(d):
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# Assuming we have a git path, it'll use slashes even on windows...I hope.
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if '/' in d:
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return d.split('/', 1)
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else:
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return (d, None)
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def get_dev_null():
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"""Lazily create a /dev/null fd for use in shell()"""
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global dev_null_fd
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if dev_null_fd is None:
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dev_null_fd = open(os.devnull, 'w')
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return dev_null_fd
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def shell(cmd, strip=True, cwd=None, stdin=None, die_on_failure=True,
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ignore_errors=False, text=True):
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# Escape args when logging for easy repro.
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quoted_cmd = [quote(arg) for arg in cmd]
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log_verbose('Running in %s: %s' % (cwd, ' '.join(quoted_cmd)))
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err_pipe = subprocess.PIPE
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if ignore_errors:
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# Silence errors if requested.
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err_pipe = get_dev_null()
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start = time.time()
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p = subprocess.Popen(cmd, cwd=cwd, stdout=subprocess.PIPE, stderr=err_pipe,
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stdin=subprocess.PIPE,
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universal_newlines=text)
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stdout, stderr = p.communicate(input=stdin)
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elapsed = time.time() - start
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log_verbose('Command took %0.1fs' % elapsed)
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if p.returncode == 0 or ignore_errors:
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if stderr and not ignore_errors:
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eprint('`%s` printed to stderr:' % ' '.join(quoted_cmd))
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eprint(stderr.rstrip())
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if strip:
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if text:
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stdout = stdout.rstrip('\r\n')
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else:
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stdout = stdout.rstrip(b'\r\n')
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if VERBOSE:
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for l in stdout.splitlines():
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log_verbose("STDOUT: %s" % l)
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return stdout
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err_msg = '`%s` returned %s' % (' '.join(quoted_cmd), p.returncode)
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eprint(err_msg)
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if stderr:
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eprint(stderr.rstrip())
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if die_on_failure:
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sys.exit(2)
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raise RuntimeError(err_msg)
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def git(*cmd, **kwargs):
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return shell(['git'] + list(cmd), **kwargs)
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def svn(cwd, *cmd, **kwargs):
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return shell(['svn'] + list(cmd), cwd=cwd, **kwargs)
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def program_exists(cmd):
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if sys.platform == 'win32' and not cmd.endswith('.exe'):
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cmd += '.exe'
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for path in os.environ["PATH"].split(os.pathsep):
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if os.access(os.path.join(path, cmd), os.X_OK):
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return True
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return False
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def get_default_rev_range():
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# Get the newest common ancestor between HEAD and our upstream branch.
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upstream_rev = git('merge-base', 'HEAD', '@{upstream}', ignore_errors=True)
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if not upstream_rev:
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eprint("Warning: git-llvm assumes that origin/master is the upstream "
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"branch but git does not.")
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eprint("To make this warning go away: git branch -u origin/master")
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eprint("To avoid this warning when creating branches: "
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"git checkout -b MyBranchName origin/master")
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upstream_rev = git('merge-base', 'HEAD', 'origin/master')
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return '%s..' % upstream_rev
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def get_revs_to_push(rev_range):
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if not rev_range:
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rev_range = get_default_rev_range()
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# Use git show rather than some plumbing command to figure out which revs
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# are in rev_range because it handles single revs (HEAD^) and ranges
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# (foo..bar) like we want.
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return git('show', '--reverse', '--quiet',
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'--pretty=%h', rev_range).splitlines()
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def clean_svn(svn_repo):
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svn(svn_repo, 'revert', '-R', '.')
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# Unfortunately it appears there's no svn equivalent for git clean, so we
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# have to do it ourselves.
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for line in svn(svn_repo, 'status', '--no-ignore').split('\n'):
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if not line.startswith('?'):
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continue
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filename = line[1:].strip()
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filepath = os.path.abspath(os.path.join(svn_repo, filename))
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abs_svn_repo = os.path.abspath(svn_repo)
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# Safety check that the directory we are about to delete is
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# actually within our svn staging dir.
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if not filepath.startswith(abs_svn_repo):
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die("Path to clean (%s) is not in svn staging dir (%s)"
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% (filepath, abs_svn_repo))
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if os.path.isdir(filepath):
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shutil.rmtree(filepath)
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else:
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os.remove(filepath)
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def svn_init(svn_root):
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if not os.path.exists(svn_root):
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log('Creating svn staging directory: (%s)' % (svn_root))
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os.makedirs(svn_root)
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svn(svn_root, 'checkout', '--depth=empty',
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'https://llvm.org/svn/llvm-project/', '.')
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log("svn staging area ready in '%s'" % svn_root)
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if not os.path.isdir(svn_root):
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die("Can't initialize svn staging dir (%s)" % svn_root)
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def fix_eol_style_native(rev, svn_sr_path, files):
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"""Fix line endings before applying patches with Unix endings
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SVN on Windows will check out files with CRLF for files with the
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svn:eol-style property set to "native". This breaks `git apply`, which
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typically works with Unix-line ending patches. Work around the problem here
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by doing a dos2unix up front for files with svn:eol-style set to "native".
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SVN will not commit a mass line ending re-doing because it detects the line
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ending format for files with this property.
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"""
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# Skip files that don't exist in SVN yet.
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files = [f for f in files if os.path.exists(os.path.join(svn_sr_path, f))]
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# Use ignore_errors because 'svn propget' prints errors if the file doesn't
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# have the named property. There doesn't seem to be a way to suppress that.
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eol_props = svn(svn_sr_path, 'propget', 'svn:eol-style', *files,
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ignore_errors=True)
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crlf_files = []
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if len(files) == 1:
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# No need to split propget output on ' - ' when we have one file.
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if eol_props.strip() in ['native', 'CRLF']:
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crlf_files = files
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else:
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for eol_prop in eol_props.split('\n'):
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# Remove spare CR.
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eol_prop = eol_prop.strip('\r')
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if not eol_prop:
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continue
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prop_parts = eol_prop.rsplit(' - ', 1)
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if len(prop_parts) != 2:
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eprint("unable to parse svn propget line:")
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eprint(eol_prop)
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continue
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(f, eol_style) = prop_parts
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if eol_style == 'native':
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crlf_files.append(f)
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if crlf_files:
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# Reformat all files with native SVN line endings to Unix format. SVN
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# knows files with native line endings are text files. It will commit
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# just the diff, and not a mass line ending change.
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shell(['dos2unix'] + crlf_files, ignore_errors=True, cwd=svn_sr_path)
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def split_subrepo(f, git_to_svn_mapping):
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# Given a path, splits it into (subproject, rest-of-path). If the path is
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# not in a subproject, returns ('', full-path).
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subproject, remainder = split_first_path_component(f)
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if subproject in git_to_svn_mapping:
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return subproject, remainder
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else:
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return '', f
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def get_all_parent_dirs(name):
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parts = []
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head, tail = os.path.split(name)
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while head:
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parts.append(head)
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head, tail = os.path.split(head)
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return parts
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def svn_push_one_rev(svn_repo, rev, git_to_svn_mapping, dry_run):
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def split_status(x):
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x = x.split('\t')
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return x[1], x[0]
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files_status = [split_status(x) for x in
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git('diff-tree', '--no-commit-id', '--name-status',
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'--no-renames', '-r', rev).split('\n')]
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if not files_status:
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raise RuntimeError('Empty diff for rev %s?' % rev)
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# Split files by subrepo
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subrepo_files = collections.defaultdict(list)
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for f, st in files_status:
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subrepo, remainder = split_subrepo(f, git_to_svn_mapping)
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subrepo_files[subrepo].append((remainder, st))
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status = svn(svn_repo, 'status', '--no-ignore')
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if status:
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die("Can't push git rev %s because status in svn staging dir (%s) is "
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"not empty:\n%s" % (rev, svn_repo, status))
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svn_dirs_to_update = set()
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for sr, files_status in iteritems(subrepo_files):
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svn_sr_path = git_to_svn_mapping[sr]
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for f, _ in files_status:
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svn_dirs_to_update.add(
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os.path.dirname(os.path.join(svn_sr_path, f)))
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# We also need to svn update any parent directories which are not yet
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# present
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parent_dirs = set()
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for dir in svn_dirs_to_update:
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parent_dirs.update(get_all_parent_dirs(dir))
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parent_dirs = set(dir for dir in parent_dirs
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if not os.path.exists(os.path.join(svn_repo, dir)))
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svn_dirs_to_update.update(parent_dirs)
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# Sort by length to ensure that the parent directories are passed to svn
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# before child directories.
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sorted_dirs_to_update = sorted(svn_dirs_to_update, key=len)
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# SVN update only in the affected directories.
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svn(svn_repo, 'update', '--depth=files', *sorted_dirs_to_update)
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for sr, files_status in iteritems(subrepo_files):
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svn_sr_path = os.path.join(svn_repo, git_to_svn_mapping[sr])
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if os.name == 'nt':
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fix_eol_style_native(rev, svn_sr_path,
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[f for f, _ in files_status])
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# We use text=False (and pass '--binary') so that we can get an exact
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# diff that can be passed as-is to 'git apply' without any line ending,
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# encoding, or other mangling.
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diff = git('show', '--binary', rev, '--',
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*(os.path.join(sr, f) for f, _ in files_status),
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strip=False, text=False)
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# git is the only thing that can handle its own patches...
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if sr == '':
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prefix_strip = '-p1'
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else:
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prefix_strip = '-p2'
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try:
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shell(['git', 'apply', prefix_strip, '-'], cwd=svn_sr_path,
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stdin=diff, die_on_failure=False, text=False)
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except RuntimeError as e:
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eprint("Patch doesn't apply: maybe you should try `git pull -r` "
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"first?")
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sys.exit(2)
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# Handle removed files and directories. We need to be careful not to
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# remove directories just because they _look_ empty in the svn tree, as
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# we might be missing sibling directories in the working copy. So, only
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# remove parent directories if they're empty on both the git and svn
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# sides.
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maybe_dirs_to_remove = set()
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for f, st in files_status:
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if st == 'D':
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maybe_dirs_to_remove.update(get_all_parent_dirs(f))
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svn(svn_sr_path, 'remove', f)
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elif not (st == 'A' or st == 'M' or st == 'T'):
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# Add is handled below, and nothing needs to be done for Modify.
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# (FIXME: Type-change between symlink and file might need some
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# special handling, but let's ignore that for now.)
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die("Unexpected git status for %r: %r" % (f, st))
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maybe_dirs_to_remove = sorted(maybe_dirs_to_remove, key=len)
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for f in maybe_dirs_to_remove:
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if(not os.path.exists(os.path.join(svn_sr_path, f)) and
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git('ls-tree', '-d', rev, os.path.join(sr, f)) == ''):
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svn(svn_sr_path, 'remove', f)
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status_lines = svn(svn_repo, 'status', '--no-ignore').split('\n')
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for l in status_lines:
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f = l[1:].strip()
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if l.startswith('?') or l.startswith('I'):
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svn(svn_repo, 'add', '--no-ignore', f)
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# Now we're ready to commit.
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commit_msg = git('show', '--pretty=%B', '--quiet', rev)
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if not dry_run:
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commit_args = ['commit', '-m', commit_msg]
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if '--force-interactive' in svn(svn_repo, 'commit', '--help'):
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commit_args.append('--force-interactive')
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log(svn(svn_repo, *commit_args))
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log('Committed %s to svn.' % rev)
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else:
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log("Would have committed %s to svn, if this weren't a dry run." % rev)
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def cmd_push(args):
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'''Push changes back to SVN: this is extracted from Justin Lebar's script
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available here: https://github.com/jlebar/llvm-repo-tools/
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Note: a current limitation is that git does not track file rename, so they
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will show up in SVN as delete+add.
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'''
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# Get the git root
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git_root = git('rev-parse', '--show-toplevel')
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if not os.path.isdir(git_root):
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die("Can't find git root dir")
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# Push from the root of the git repo
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os.chdir(git_root)
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# Get the remote URL, and check if it's one of the standalone repos.
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git_remote_url = git('ls-remote', '--get-url', 'origin')
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git_remote_url = git_remote_url.rstrip('.git').rstrip('/')
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git_remote_repo_name = git_remote_url.rsplit('/', 1)[-1]
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split_repo_path = SPLIT_REPO_NAMES.get(git_remote_repo_name)
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if split_repo_path:
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git_to_svn_mapping = {'': split_repo_path}
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else:
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# Default to the monorepo mapping
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git_to_svn_mapping = LLVM_MONOREPO_SVN_MAPPING
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# We need a staging area for SVN, let's hide it in the .git directory.
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dot_git_dir = git('rev-parse', '--git-common-dir')
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# Not all versions of git support --git-common-dir and just print the
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# unknown command back. If this happens, fall back to --git-dir
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if dot_git_dir == '--git-common-dir':
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dot_git_dir = git('rev-parse', '--git-dir')
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svn_root = os.path.join(dot_git_dir, 'llvm-upstream-svn')
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svn_init(svn_root)
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rev_range = args.rev_range
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dry_run = args.dry_run
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revs = get_revs_to_push(rev_range)
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if not args.force and not revs:
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die('Nothing to push: No revs in range %s.' % rev_range)
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log('%sPushing %d %s commit%s:\n%s' %
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('[DryRun] ' if dry_run else '', len(revs),
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'split-repo (%s)' % split_repo_path
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if split_repo_path else 'monorepo',
|
|
's' if len(revs) != 1 else '',
|
|
'\n'.join(' ' + git('show', '--oneline', '--quiet', c)
|
|
for c in revs)))
|
|
|
|
# Ask confirmation if multiple commits are about to be pushed
|
|
if not args.force and len(revs) > 1:
|
|
if not ask_confirm("Are you sure you want to create %d commits?" % len(revs)):
|
|
die("Aborting")
|
|
|
|
for r in revs:
|
|
clean_svn(svn_root)
|
|
svn_push_one_rev(svn_root, r, git_to_svn_mapping, dry_run)
|
|
|
|
|
|
def lookup_llvm_svn_id(git_commit_hash):
|
|
# Use --format=%b to get the raw commit message, without any extra
|
|
# whitespace.
|
|
commit_msg = git('log', '-1', '--format=%b', git_commit_hash,
|
|
ignore_errors=True)
|
|
if len(commit_msg) == 0:
|
|
die("Can't find git commit " + git_commit_hash)
|
|
# If a commit has multiple "llvm-svn:" lines (e.g. if the commit is
|
|
# reverting/quoting a previous commit), choose the last one, which should
|
|
# be the authoritative one.
|
|
svn_match_iter = re.finditer('^llvm-svn: (\d{5,7})$', commit_msg,
|
|
re.MULTILINE)
|
|
svn_match = None
|
|
for m in svn_match_iter:
|
|
svn_match = m.group(1)
|
|
if svn_match:
|
|
return int(svn_match)
|
|
die("Can't find svn revision in git commit " + git_commit_hash)
|
|
|
|
|
|
def cmd_svn_lookup(args):
|
|
'''Find the SVN revision id for a given git commit hash.
|
|
|
|
This is identified by 'llvm-svn: NNNNNN' in the git commit message.'''
|
|
# Get the git root
|
|
git_root = git('rev-parse', '--show-toplevel')
|
|
if not os.path.isdir(git_root):
|
|
die("Can't find git root dir")
|
|
|
|
# Run commands from the root
|
|
os.chdir(git_root)
|
|
|
|
log('r' + str(lookup_llvm_svn_id(args.git_commit_hash)))
|
|
|
|
|
|
def git_hash_by_svn_rev(svn_rev):
|
|
'''Find the git hash for a given svn revision.
|
|
|
|
This check is paranoid: 'llvm-svn: NNNNNN' could exist on its own line
|
|
somewhere else in the commit message. Look in the full log message to see
|
|
if it's actually on the last line.
|
|
|
|
Since this check is expensive (we're searching every single commit), limit
|
|
to the past 10k commits (about 5 months).
|
|
'''
|
|
possible_hashes = git(
|
|
'log', '--format=%H', '--grep', '^llvm-svn: %d$' % svn_rev,
|
|
'HEAD~10000...HEAD').split('\n')
|
|
matching_hashes = [h for h in possible_hashes
|
|
if lookup_llvm_svn_id(h) == svn_rev]
|
|
if len(matching_hashes) > 1:
|
|
die("svn revision r%d has ambiguous commits: %s" % (
|
|
svn_rev, ', '.join(matching_hashes)))
|
|
elif len(matching_hashes) < 1:
|
|
die("svn revision r%d matches no commits" % svn_rev)
|
|
return matching_hashes[0]
|
|
|
|
|
|
def cmd_revert(args):
|
|
'''Revert a commit by either SVN id (rNNNNNN) or git hash. This also
|
|
populates the git commit message with both the SVN revision and git hash of
|
|
the change being reverted.'''
|
|
|
|
# Get the git root
|
|
git_root = git('rev-parse', '--show-toplevel')
|
|
if not os.path.isdir(git_root):
|
|
die("Can't find git root dir")
|
|
|
|
# Run commands from the root
|
|
os.chdir(git_root)
|
|
|
|
# Check for a client branch first.
|
|
open_files = git('status', '-uno', '-s', '--porcelain')
|
|
if len(open_files) > 0:
|
|
die("Found open files. Please stash and then revert.\n" + open_files)
|
|
|
|
# If the revision looks like rNNNNNN (or with a callsign, e.g. rLLDNNNNNN),
|
|
# use that. Otherwise, look for it in the git commit.
|
|
svn_match = re.match('^r[A-Z]*(\d{5,7})$', args.revision)
|
|
if svn_match:
|
|
# If the revision looks like rNNNNNN, use that as the svn revision, and
|
|
# grep through git commits to find which one corresponds to that svn
|
|
# revision.
|
|
svn_rev = int(svn_match.group(1))
|
|
git_hash = git_hash_by_svn_rev(svn_rev)
|
|
else:
|
|
# Otherwise, this looks like a git hash, so we just need to grab the
|
|
# svn revision from the end of the commit message. Get the actual git
|
|
# hash in case the revision is something like "HEAD~1"
|
|
git_hash = git('rev-parse', '--verify', args.revision + '^{commit}')
|
|
svn_rev = lookup_llvm_svn_id(git_hash)
|
|
|
|
msg = git('log', '-1', '--format=%s', git_hash)
|
|
|
|
log_verbose('Ready to revert r%d (%s): "%s"' % (svn_rev, git_hash, msg))
|
|
|
|
revert_args = ['revert', '--no-commit', git_hash]
|
|
# TODO: Running --edit doesn't seem to work, with errors that stdin is not
|
|
# a tty.
|
|
commit_args = [
|
|
'commit', '-m', 'Revert ' + msg,
|
|
'-m', 'This reverts r%d (git commit %s)' % (svn_rev, git_hash)]
|
|
if args.dry_run:
|
|
log("Would have run the following commands, if this weren't a"
|
|
"dry run:\n"
|
|
'1) git %s\n2) git %s' % (
|
|
' '.join(quote(arg) for arg in revert_args),
|
|
' '.join(quote(arg) for arg in commit_args)))
|
|
return
|
|
|
|
git(*revert_args)
|
|
commit_log = git(*commit_args)
|
|
|
|
log('Created revert of r%d: %s' % (svn_rev, commit_log))
|
|
log("Run 'git llvm push -n' to inspect your changes and "
|
|
"run 'git llvm push' when ready")
|
|
|
|
|
|
if __name__ == '__main__':
|
|
if not program_exists('svn'):
|
|
die('error: git-llvm needs svn command, but svn is not installed.')
|
|
|
|
argv = sys.argv[1:]
|
|
p = argparse.ArgumentParser(
|
|
prog='git llvm', formatter_class=argparse.RawDescriptionHelpFormatter,
|
|
description=__doc__)
|
|
subcommands = p.add_subparsers(title='subcommands',
|
|
description='valid subcommands',
|
|
help='additional help')
|
|
verbosity_group = p.add_mutually_exclusive_group()
|
|
verbosity_group.add_argument('-q', '--quiet', action='store_true',
|
|
help='print less information')
|
|
verbosity_group.add_argument('-v', '--verbose', action='store_true',
|
|
help='print more information')
|
|
|
|
parser_push = subcommands.add_parser(
|
|
'push', description=cmd_push.__doc__,
|
|
help='push changes back to the LLVM SVN repository')
|
|
parser_push.add_argument(
|
|
'-n',
|
|
'--dry-run',
|
|
dest='dry_run',
|
|
action='store_true',
|
|
help='Do everything other than commit to svn. Leaves junk in the svn '
|
|
'repo, so probably will not work well if you try to commit more '
|
|
'than one rev.')
|
|
parser_push.add_argument(
|
|
'-f',
|
|
'--force',
|
|
action='store_true',
|
|
help='Do not ask for confirmation when pushing multiple commits.')
|
|
parser_push.add_argument(
|
|
'rev_range',
|
|
metavar='GIT_REVS',
|
|
type=str,
|
|
nargs='?',
|
|
help="revs to push (default: everything not in the branch's "
|
|
'upstream, or not in origin/master if the branch lacks '
|
|
'an explicit upstream)')
|
|
parser_push.set_defaults(func=cmd_push)
|
|
|
|
parser_revert = subcommands.add_parser(
|
|
'revert', description=cmd_revert.__doc__,
|
|
help='Revert a commit locally.')
|
|
parser_revert.add_argument(
|
|
'revision',
|
|
help='Revision to revert. Can either be an SVN revision number '
|
|
"(rNNNNNN) or a git commit hash (anything that doesn't look "
|
|
'like an SVN revision number).')
|
|
parser_revert.add_argument(
|
|
'-n',
|
|
'--dry-run',
|
|
dest='dry_run',
|
|
action='store_true',
|
|
help='Do everything other than perform a revert. Prints the git '
|
|
'revert command it would have run.')
|
|
parser_revert.set_defaults(func=cmd_revert)
|
|
|
|
parser_svn_lookup = subcommands.add_parser(
|
|
'svn-lookup', description=cmd_svn_lookup.__doc__,
|
|
help='Find the llvm-svn revision for a given commit.')
|
|
parser_svn_lookup.add_argument(
|
|
'git_commit_hash',
|
|
help='git_commit_hash for which we will look up the svn revision id.')
|
|
parser_svn_lookup.set_defaults(func=cmd_svn_lookup)
|
|
|
|
args = p.parse_args(argv)
|
|
VERBOSE = args.verbose
|
|
QUIET = args.quiet
|
|
|
|
# Python3 workaround, for when not arguments are provided.
|
|
# See https://bugs.python.org/issue16308
|
|
try:
|
|
func = args.func
|
|
except AttributeError:
|
|
# No arguments or subcommands were given.
|
|
parser.print_help()
|
|
parser.exit()
|
|
|
|
# Dispatch to the right subcommand
|
|
args.func(args)
|