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431 lines
15 KiB
Python
431 lines
15 KiB
Python
#!/usr/bin/env python
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# Copyright (c) 2014 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Rolls a git-svn dependency.
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It takes the path to a dep and a git commit hash or svn revision, and updates
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the parent repo's DEPS file with the corresponding git commit hash.
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Sample invocation:
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[chromium/src]$ roll-dep-svn third_party/WebKit 12345
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After the script completes, the DEPS file will be dirty with the new revision.
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The user can then:
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$ git add DEPS
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$ git commit
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"""
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import ast
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import optparse
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import os
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import re
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import sys
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from itertools import izip
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from subprocess import check_output, Popen, PIPE
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from textwrap import dedent
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SHA1_RE = re.compile('^[a-fA-F0-9]{40}$')
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GIT_SVN_ID_RE = re.compile('^git-svn-id: .*@([0-9]+) .*$')
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ROLL_DESCRIPTION_STR = (
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'''Roll %(dep_path)s %(before_rev)s:%(after_rev)s%(svn_range)s
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Summary of changes available at:
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%(revlog_url)s
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''')
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def shorten_dep_path(dep):
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"""Shorten the given dep path if necessary."""
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while len(dep) > 31:
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dep = '.../' + dep.lstrip('./').partition('/')[2]
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return dep
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def posix_path(path):
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"""Convert a possibly-Windows path to a posix-style path."""
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(_, path) = os.path.splitdrive(path)
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return path.replace(os.sep, '/')
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def platform_path(path):
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"""Convert a path to the native path format of the host OS."""
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return path.replace('/', os.sep)
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def find_gclient_root():
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"""Find the directory containing the .gclient file."""
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cwd = posix_path(os.getcwd())
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result = ''
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for _ in xrange(len(cwd.split('/'))):
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if os.path.exists(os.path.join(result, '.gclient')):
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return result
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result = os.path.join(result, os.pardir)
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assert False, 'Could not find root of your gclient checkout.'
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def get_solution(gclient_root, dep_path):
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"""Find the solution in .gclient containing the dep being rolled."""
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dep_path = os.path.relpath(dep_path, gclient_root)
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cwd = os.getcwd().rstrip(os.sep) + os.sep
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gclient_root = os.path.realpath(gclient_root)
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gclient_path = os.path.join(gclient_root, '.gclient')
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gclient_locals = {}
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execfile(gclient_path, {}, gclient_locals)
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for soln in gclient_locals['solutions']:
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soln_relpath = platform_path(soln['name'].rstrip('/')) + os.sep
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if (dep_path.startswith(soln_relpath) or
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cwd.startswith(os.path.join(gclient_root, soln_relpath))):
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return soln
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assert False, 'Could not determine the parent project for %s' % dep_path
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def is_git_hash(revision):
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"""Determines if a given revision is a git hash."""
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return SHA1_RE.match(revision)
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def verify_git_revision(dep_path, revision):
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"""Verify that a git revision exists in a repository."""
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p = Popen(['git', 'rev-list', '-n', '1', revision],
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cwd=dep_path, stdout=PIPE, stderr=PIPE)
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result = p.communicate()[0].strip()
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if p.returncode != 0 or not is_git_hash(result):
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result = None
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return result
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def get_svn_revision(dep_path, git_revision):
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"""Given a git revision, return the corresponding svn revision."""
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p = Popen(['git', 'log', '-n', '1', '--pretty=format:%B', git_revision],
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stdout=PIPE, cwd=dep_path)
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(log, _) = p.communicate()
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assert p.returncode == 0, 'git log %s failed.' % git_revision
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for line in reversed(log.splitlines()):
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m = GIT_SVN_ID_RE.match(line.strip())
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if m:
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return m.group(1)
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return None
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def convert_svn_revision(dep_path, revision):
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"""Find the git revision corresponding to an svn revision."""
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err_msg = 'Unknown error'
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revision = int(revision)
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latest_svn_rev = None
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with open(os.devnull, 'w') as devnull:
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for ref in ('HEAD', 'origin/master'):
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try:
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log_p = Popen(['git', 'log', ref],
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cwd=dep_path, stdout=PIPE, stderr=devnull)
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grep_p = Popen(['grep', '-e', '^commit ', '-e', '^ *git-svn-id: '],
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stdin=log_p.stdout, stdout=PIPE, stderr=devnull)
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git_rev = None
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prev_svn_rev = None
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for line in grep_p.stdout:
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if line.startswith('commit '):
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git_rev = line.split()[1]
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continue
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try:
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svn_rev = int(line.split()[1].partition('@')[2])
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except (IndexError, ValueError):
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print >> sys.stderr, (
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'WARNING: Could not parse svn revision out of "%s"' % line)
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continue
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if not latest_svn_rev or int(svn_rev) > int(latest_svn_rev):
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latest_svn_rev = svn_rev
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if svn_rev == revision:
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return git_rev
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if svn_rev > revision:
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prev_svn_rev = svn_rev
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continue
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if prev_svn_rev:
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err_msg = 'git history skips from revision %d to revision %d.' % (
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svn_rev, prev_svn_rev)
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else:
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err_msg = (
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'latest available revision is %d; you may need to '
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'"git fetch origin" to get the latest commits.' %
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latest_svn_rev)
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finally:
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log_p.terminate()
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grep_p.terminate()
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raise RuntimeError('No match for revision %d; %s' % (revision, err_msg))
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def get_git_revision(dep_path, revision):
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"""Convert the revision argument passed to the script to a git revision."""
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svn_revision = None
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if revision.startswith('r'):
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git_revision = convert_svn_revision(dep_path, revision[1:])
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svn_revision = revision[1:]
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elif re.search('[a-fA-F]', revision):
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git_revision = verify_git_revision(dep_path, revision)
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if not git_revision:
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raise RuntimeError('Please \'git fetch origin\' in %s' % dep_path)
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svn_revision = get_svn_revision(dep_path, git_revision)
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elif len(revision) > 6:
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git_revision = verify_git_revision(dep_path, revision)
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if git_revision:
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svn_revision = get_svn_revision(dep_path, git_revision)
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else:
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git_revision = convert_svn_revision(dep_path, revision)
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svn_revision = revision
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else:
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try:
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git_revision = convert_svn_revision(dep_path, revision)
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svn_revision = revision
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except RuntimeError:
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git_revision = verify_git_revision(dep_path, revision)
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if not git_revision:
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raise
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svn_revision = get_svn_revision(dep_path, git_revision)
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return git_revision, svn_revision
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def ast_err_msg(node):
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return 'ERROR: Undexpected DEPS file AST structure at line %d column %d' % (
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node.lineno, node.col_offset)
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def find_deps_section(deps_ast, section):
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"""Find a top-level section of the DEPS file in the AST."""
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try:
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result = [n.value for n in deps_ast.body if
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n.__class__ is ast.Assign and
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n.targets[0].__class__ is ast.Name and
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n.targets[0].id == section][0]
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return result
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except IndexError:
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return None
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def find_dict_index(dict_node, key):
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"""Given a key, find the index of the corresponding dict entry."""
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assert dict_node.__class__ is ast.Dict, ast_err_msg(dict_node)
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indices = [i for i, n in enumerate(dict_node.keys) if
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n.__class__ is ast.Str and n.s == key]
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assert len(indices) < 2, (
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'Found redundant dict entries for key "%s"' % key)
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return indices[0] if indices else None
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def update_node(deps_lines, deps_ast, node, git_revision):
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"""Update an AST node with the new git revision."""
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if node.__class__ is ast.Str:
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return update_string(deps_lines, node, git_revision)
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elif node.__class__ is ast.BinOp:
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return update_binop(deps_lines, deps_ast, node, git_revision)
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elif node.__class__ is ast.Call:
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return update_call(deps_lines, deps_ast, node, git_revision)
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elif node.__class__ is ast.Dict:
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return update_dict(deps_lines, deps_ast, node, git_revision)
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else:
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assert False, ast_err_msg(node)
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def update_string(deps_lines, string_node, git_revision):
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"""Update a string node in the AST with the new git revision."""
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line_idx = string_node.lineno - 1
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start_idx = string_node.col_offset - 1
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line = deps_lines[line_idx]
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(prefix, sep, old_rev) = string_node.s.partition('@')
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if sep:
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start_idx = line.find(prefix + sep, start_idx) + len(prefix + sep)
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tail_idx = start_idx + len(old_rev)
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else:
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start_idx = line.find(prefix, start_idx)
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tail_idx = start_idx + len(prefix)
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old_rev = prefix
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deps_lines[line_idx] = line[:start_idx] + git_revision + line[tail_idx:]
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return line_idx
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def update_binop(deps_lines, deps_ast, binop_node, git_revision):
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"""Update a binary operation node in the AST with the new git revision."""
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# Since the revision part is always last, assume that it's the right-hand
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# operand that needs to be updated.
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return update_node(deps_lines, deps_ast, binop_node.right, git_revision)
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def update_call(deps_lines, deps_ast, call_node, git_revision):
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"""Update a function call node in the AST with the new git revision."""
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# The only call we know how to handle is Var()
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assert call_node.func.id == 'Var', ast_err_msg(call_node)
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assert call_node.args and call_node.args[0].__class__ is ast.Str, (
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ast_err_msg(call_node))
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return update_var(deps_lines, deps_ast, call_node.args[0].s, git_revision)
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def update_dict(deps_lines, deps_ast, dict_node, git_revision):
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"""Update a dict node in the AST with the new git revision."""
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for key, value in zip(dict_node.keys, dict_node.values):
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if key.__class__ is ast.Str and key.s == 'url':
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return update_node(deps_lines, deps_ast, value, git_revision)
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def update_var(deps_lines, deps_ast, var_name, git_revision):
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"""Update an entry in the vars section of the DEPS file with the new
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git revision."""
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vars_node = find_deps_section(deps_ast, 'vars')
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assert vars_node, 'Could not find "vars" section of DEPS file.'
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var_idx = find_dict_index(vars_node, var_name)
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assert var_idx is not None, (
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'Could not find definition of "%s" var in DEPS file.' % var_name)
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val_node = vars_node.values[var_idx]
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return update_node(deps_lines, deps_ast, val_node, git_revision)
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def short_rev(rev, dep_path):
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return check_output(['git', 'rev-parse', '--short', rev],
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cwd=dep_path).rstrip()
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def generate_commit_message(deps_section, dep_path, dep_name, new_rev):
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dep_url = deps_section[dep_name]
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if isinstance(dep_url, dict):
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dep_url = dep_url['url']
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(url, _, old_rev) = dep_url.partition('@')
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if url.endswith('.git'):
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url = url[:-4]
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old_rev_short = short_rev(old_rev, dep_path)
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new_rev_short = short_rev(new_rev, dep_path)
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url += '/+log/%s..%s' % (old_rev_short, new_rev_short)
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try:
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old_svn_rev = get_svn_revision(dep_path, old_rev)
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new_svn_rev = get_svn_revision(dep_path, new_rev)
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except Exception:
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# Ignore failures that might arise from the repo not being checked out.
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old_svn_rev = new_svn_rev = None
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svn_range_str = ''
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if old_svn_rev and new_svn_rev:
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svn_range_str = ' (svn %s:%s)' % (old_svn_rev, new_svn_rev)
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return dedent(ROLL_DESCRIPTION_STR % {
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'dep_path': shorten_dep_path(dep_name),
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'before_rev': old_rev_short,
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'after_rev': new_rev_short,
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'svn_range': svn_range_str,
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'revlog_url': url,
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})
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def update_deps_entry(deps_lines, deps_ast, value_node, new_rev, comment):
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line_idx = update_node(deps_lines, deps_ast, value_node, new_rev)
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(content, _, _) = deps_lines[line_idx].partition('#')
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if comment:
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deps_lines[line_idx] = '%s # %s' % (content.rstrip(), comment)
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else:
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deps_lines[line_idx] = content.rstrip()
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def update_deps(deps_file, dep_path, dep_name, new_rev, comment):
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"""Update the DEPS file with the new git revision."""
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commit_msg = ''
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with open(deps_file) as fh:
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deps_content = fh.read()
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deps_locals = {}
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def _Var(key):
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return deps_locals['vars'][key]
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deps_locals['Var'] = _Var
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exec deps_content in {}, deps_locals
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deps_lines = deps_content.splitlines()
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deps_ast = ast.parse(deps_content, deps_file)
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deps_node = find_deps_section(deps_ast, 'deps')
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assert deps_node, 'Could not find "deps" section of DEPS file'
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dep_idx = find_dict_index(deps_node, dep_name)
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if dep_idx is not None:
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value_node = deps_node.values[dep_idx]
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update_deps_entry(deps_lines, deps_ast, value_node, new_rev, comment)
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commit_msg = generate_commit_message(deps_locals['deps'], dep_path,
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dep_name, new_rev)
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deps_os_node = find_deps_section(deps_ast, 'deps_os')
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if deps_os_node:
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for (os_name, os_node) in izip(deps_os_node.keys, deps_os_node.values):
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dep_idx = find_dict_index(os_node, dep_name)
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if dep_idx is not None:
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value_node = os_node.values[dep_idx]
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if value_node.__class__ is ast.Name and value_node.id == 'None':
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pass
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else:
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update_deps_entry(deps_lines, deps_ast, value_node, new_rev, comment)
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commit_msg = generate_commit_message(
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deps_locals['deps_os'][os_name.s], dep_path, dep_name, new_rev)
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if not commit_msg:
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print 'Could not find an entry in %s to update.' % deps_file
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return 1
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print 'Pinning %s' % dep_name
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print 'to revision %s' % new_rev
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print 'in %s' % deps_file
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with open(deps_file, 'w') as fh:
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for line in deps_lines:
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print >> fh, line
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deps_file_dir = os.path.normpath(os.path.dirname(deps_file))
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deps_file_root = Popen(
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['git', 'rev-parse', '--show-toplevel'],
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cwd=deps_file_dir, stdout=PIPE).communicate()[0].strip()
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with open(os.path.join(deps_file_root, '.git', 'MERGE_MSG'), 'w') as fh:
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fh.write(commit_msg)
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return 0
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def main(argv):
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usage = 'Usage: roll-dep-svn [options] <dep path> <rev> [ <DEPS file> ]'
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parser = optparse.OptionParser(usage=usage, description=__doc__)
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parser.add_option('--no-verify-revision',
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help='Don\'t verify the revision passed in. This '
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'also skips adding an svn revision comment '
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'for git dependencies and requires the passed '
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'revision to be a git hash.',
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default=False, action='store_true')
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options, args = parser.parse_args(argv)
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if len(args) not in (2, 3):
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parser.error('Expected either 2 or 3 positional parameters.')
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arg_dep_path, revision = args[:2]
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gclient_root = find_gclient_root()
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dep_path = platform_path(arg_dep_path)
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if not os.path.exists(dep_path):
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dep_path = os.path.join(gclient_root, dep_path)
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if not options.no_verify_revision:
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# Only require the path to exist if the revision should be verified. A path
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# to e.g. os deps might not be checked out.
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if not os.path.isdir(dep_path):
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print >> sys.stderr, 'No such directory: %s' % arg_dep_path
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return 1
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if len(args) > 2:
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deps_file = args[2]
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else:
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soln = get_solution(gclient_root, dep_path)
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soln_path = os.path.relpath(os.path.join(gclient_root, soln['name']))
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deps_file = os.path.join(soln_path, 'DEPS')
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dep_name = posix_path(os.path.relpath(dep_path, gclient_root))
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if options.no_verify_revision:
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if not is_git_hash(revision):
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print >> sys.stderr, (
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'The passed revision %s must be a git hash when skipping revision '
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'verification.' % revision)
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return 1
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git_rev = revision
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comment = None
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else:
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git_rev, svn_rev = get_git_revision(dep_path, revision)
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comment = ('from svn revision %s' % svn_rev) if svn_rev else None
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if not git_rev:
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print >> sys.stderr, 'Could not find git revision matching %s.' % revision
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return 1
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return update_deps(deps_file, dep_path, dep_name, git_rev, comment)
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if __name__ == '__main__':
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try:
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sys.exit(main(sys.argv[1:]))
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except KeyboardInterrupt:
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sys.stderr.write('interrupted\n')
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sys.exit(1)
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