blob: c3c972f56178fae92b68742370e79d4a5b24b3ed [file] [log] [blame]
#!/usr/bin/env perl
# Copyright (C) 2005, 2006, 2007 Apple Inc. All rights reserved.
# Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
# Copyright (C) 2010 Chris Jerdonek (chris.jerdonek@gmail.com)
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. Neither the name of Apple Inc. ("Apple") nor the names of
# its contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# "patch" script for WebKit Open Source Project, used to apply patches.
# Differences from invoking "patch -p0":
#
# Handles added files (does a svn add with logic to handle local changes).
# Handles added directories (does a svn add).
# Handles removed files (does a svn rm with logic to handle local changes).
# Handles removed directories--those with no more files or directories left in them
# (does a svn rm).
# Has mode where it will roll back to svn version numbers in the patch file so svn
# can do a 3-way merge.
# Paths from Index: lines are used rather than the paths on the patch lines, which
# makes patches generated by "cvs diff" work (increasingly unimportant since we
# use Subversion now).
# ChangeLog patches use --fuzz=3 to prevent rejects.
# Handles binary files (requires patches made by svn-create-patch).
# Handles copied and moved files (requires patches made by svn-create-patch).
# Handles git-diff patches (without binary changes) created at the top-level directory
#
# Missing features:
#
# Handle property changes.
# Handle copied and moved directories (would require patches made by svn-create-patch).
# When doing a removal, check that old file matches what's being removed.
# Notice a patch that's being applied at the "wrong level" and make it work anyway.
# Do a dry run on the whole patch and don't do anything if part of the patch is
# going to fail (probably too strict unless we exclude ChangeLog).
# Handle git-diff patches with binary delta
use strict;
use warnings;
use Digest::MD5;
use File::Basename;
use File::Copy qw(copy);
use File::Spec;
use Getopt::Long;
use MIME::Base64;
use POSIX qw(strftime);
use FindBin;
use lib $FindBin::Bin;
use VCSUtils;
sub addDirectoriesIfNeeded($);
sub applyPatch($$;$);
sub checksum($);
sub handleBinaryChange($$);
sub handleGitBinaryChange($$);
sub isDirectoryEmptyForRemoval($);
sub patch($);
sub removeDirectoriesIfNeeded();
# These should be replaced by an scm class/module:
sub scmKnowsOfFile($);
sub scmCopy($$);
sub scmAdd($);
sub scmRemove($);
my $merge = 0;
my $showHelp = 0;
my $reviewer;
my $force = 0;
my $skipChangeLogs = 0;
my $optionParseSuccess = GetOptions(
"merge!" => \$merge,
"help!" => \$showHelp,
"reviewer=s" => \$reviewer,
"force!" => \$force,
"skip-changelogs" => \$skipChangeLogs
);
if (!$optionParseSuccess || $showHelp) {
print STDERR basename($0) . " [-h|--help] [--force] [-m|--merge] [-r|--reviewer name] [--skip-changelogs] patch1 [patch2 ...]\n";
exit 1;
}
my %removeDirectoryIgnoreList = (
'.' => 1,
'..' => 1,
'.git' => 1,
'.svn' => 1,
'_svn' => 1,
);
my $epochTime = time(); # This is used to set the date in ChangeLog files.
my $globalExitStatus = 0;
my $repositoryRootPath = determineVCSRoot();
my %checkedDirectories;
# Need to use a typeglob to pass the file handle as a parameter,
# otherwise get a bareword error.
my @diffHashRefs = parsePatch(*ARGV);
print "Parsed " . @diffHashRefs . " diffs from patch file(s).\n";
die "No diff found." unless @diffHashRefs;
my $preparedPatchHash = prepareParsedPatch($force, @diffHashRefs);
my @copyDiffHashRefs = @{$preparedPatchHash->{copyDiffHashRefs}};
my @nonCopyDiffHashRefs = @{$preparedPatchHash->{nonCopyDiffHashRefs}};
my %sourceRevisions = %{$preparedPatchHash->{sourceRevisionHash}};
if ($merge) {
die "--merge is currently only supported for SVN" unless isSVN();
# How do we handle Git patches applied to an SVN checkout here?
for my $file (sort keys %sourceRevisions) {
my $version = $sourceRevisions{$file};
print "Getting version $version of $file\n";
my $escapedFile = escapeSubversionPath($file);
system("svn", "update", "-r", $version, $escapedFile) == 0 or die "Failed to run svn update -r $version $escapedFile.";
}
}
# Handle copied and moved files first since moved files may have their
# source deleted before the move.
for my $copyDiffHashRef (@copyDiffHashRefs) {
my $indexPath = $copyDiffHashRef->{indexPath};
my $copiedFromPath = $copyDiffHashRef->{copiedFromPath};
addDirectoriesIfNeeded(dirname($indexPath));
scmCopy($copiedFromPath, $indexPath);
}
for my $diffHashRef (@nonCopyDiffHashRefs) {
patch($diffHashRef);
}
removeDirectoriesIfNeeded();
exit $globalExitStatus;
sub addDirectoriesIfNeeded($)
{
# Git removes a directory once the last file in it is removed. We need
# explicitly check for the existence of each directory along the path
# (and create it if it doesn't) so as to support patches that move all files in
# directory A to A/B. That is, we cannot depend on %checkedDirectories.
my ($path) = @_;
my @dirs = File::Spec->splitdir($path);
my $dir = ".";
while (scalar @dirs) {
$dir = File::Spec->catdir($dir, shift @dirs);
next if !isGit() && exists $checkedDirectories{$dir};
if (! -e $dir) {
mkdir $dir or die "Failed to create required directory '$dir' for path '$path'\n";
scmAdd($dir);
$checkedDirectories{$dir} = 1;
}
elsif (-d $dir) {
# SVN prints "svn: warning: 'directory' is already under version control"
# if you try and add a directory which is already in the repository.
# Git will ignore the add, but re-adding large directories can be sloooow.
# So we check first to see if the directory is under version control first.
if (!scmKnowsOfFile($dir)) {
scmAdd($dir);
}
$checkedDirectories{$dir} = 1;
}
else {
die "'$dir' exists, but is not a directory";
}
}
}
# Args:
# $patch: a patch string.
# $pathRelativeToRoot: the path of the file to be patched, relative to the
# repository root. This should normally be the path
# found in the patch's "Index:" line.
# $options: a reference to an array of options to pass to the patch command.
sub applyPatch($$;$)
{
my ($patch, $pathRelativeToRoot, $options) = @_;
my $optionalArgs = {options => $options, ensureForce => $force};
my $exitStatus = runPatchCommand($patch, $repositoryRootPath, $pathRelativeToRoot, $optionalArgs);
if ($exitStatus) {
$globalExitStatus = $exitStatus;
}
}
sub checksum($)
{
my $file = shift;
open(FILE, $file) or die "Can't open '$file': $!";
binmode(FILE);
my $checksum = Digest::MD5->new->addfile(*FILE)->hexdigest();
close(FILE);
return $checksum;
}
sub handleBinaryChange($$)
{
my ($fullPath, $contents) = @_;
# [A-Za-z0-9+/] is the class of allowed base64 characters.
# One or more lines, at most 76 characters in length.
# The last line is allowed to have up to two '=' characters at the end (to signify padding).
if ($contents =~ m#((\n[A-Za-z0-9+/]{76})*\n[A-Za-z0-9+/]{2,74}?[A-Za-z0-9+/=]{2}\n)#) {
# Addition or Modification
open FILE, ">", $fullPath or die "Failed to open $fullPath.";
print FILE decode_base64($1);
close FILE;
if (!scmKnowsOfFile($fullPath)) {
# Addition
scmAdd($fullPath);
}
} else {
# Deletion
scmRemove($fullPath);
}
}
sub handleGitBinaryChange($$)
{
my ($fullPath, $diffHashRef) = @_;
my $contents = $diffHashRef->{svnConvertedText};
my ($binaryChunkType, $binaryChunk, $reverseBinaryChunkType, $reverseBinaryChunk) = decodeGitBinaryPatch($contents, $fullPath);
if (!$binaryChunkType) {
die "$fullPath: unknown git binary patch format";
}
my $isFileAddition = $diffHashRef->{isNew};
my $isFileDeletion = $diffHashRef->{isDeletion};
my $originalContents = "";
if (open FILE, $fullPath) {
die "$fullPath already exists" if $isFileAddition;
$originalContents = join("", <FILE>);
close FILE;
}
if ($reverseBinaryChunkType eq "literal") {
die "Original content of $fullPath mismatches" if $originalContents ne $reverseBinaryChunk;
}
if ($isFileDeletion) {
scmRemove($fullPath);
} else {
# Addition or Modification
my $out = "";
if ($binaryChunkType eq "delta") {
$out = applyGitBinaryPatchDelta($binaryChunk, $originalContents);
} else {
$out = $binaryChunk;
}
if ($reverseBinaryChunkType eq "delta") {
die "Original content of $fullPath mismatches" if $originalContents ne applyGitBinaryPatchDelta($reverseBinaryChunk, $out);
}
open FILE, ">", $fullPath or die "Failed to open $fullPath.";
print FILE $out;
close FILE;
if ($isFileAddition) {
scmAdd($fullPath);
}
}
}
sub isDirectoryEmptyForRemoval($)
{
my ($dir) = @_;
return 1 unless -d $dir;
my $directoryIsEmpty = 1;
opendir DIR, $dir or die "Could not open '$dir' to list files: $?";
for (my $item = readdir DIR; $item && $directoryIsEmpty; $item = readdir DIR) {
next if exists $removeDirectoryIgnoreList{$item};
if (-d File::Spec->catdir($dir, $item)) {
$directoryIsEmpty = 0;
} else {
next if (scmWillDeleteFile(File::Spec->catdir($dir, $item)));
$directoryIsEmpty = 0;
}
}
closedir DIR;
return $directoryIsEmpty;
}
# Args:
# $diffHashRef: a diff hash reference of the type returned by parsePatch().
sub patch($)
{
my ($diffHashRef) = @_;
# Make sure $patch is initialized to some value. A deletion can have no
# svnConvertedText property in the case of a deletion resulting from a
# Git rename.
my $patch = $diffHashRef->{svnConvertedText} || "";
my $fullPath = $diffHashRef->{indexPath};
my $isBinary = $diffHashRef->{isBinary};
my $isGit = $diffHashRef->{isGit};
my $hasTextChunks = $patch && $diffHashRef->{numTextChunks};
my $deletion = 0;
my $addition = 0;
$addition = 1 if ($diffHashRef->{isNew} || $patch =~ /\n@@ -0,0 .* @@/);
$deletion = 1 if ($diffHashRef->{isDeletion} || $patch =~ /\n@@ .* \+0,0 @@/);
if (basename($fullPath) eq "ChangeLog" && $skipChangeLogs) {
print "Skipping '$fullPath' since --skip-changelogs was passed on the command line.";
return;
}
if (!$addition && !$deletion && !$isBinary && $hasTextChunks) {
# Standard patch, patch tool can handle this.
if (basename($fullPath) eq "ChangeLog") {
my $changeLogDotOrigExisted = -f "${fullPath}.orig";
my $changeLogHash = fixChangeLogPatch($patch);
my $newPatch = setChangeLogDateAndReviewer($changeLogHash->{patch}, $reviewer, $epochTime);
applyPatch($newPatch, $fullPath, ["--fuzz=3"]);
unlink("${fullPath}.orig") if (! $changeLogDotOrigExisted);
} else {
applyPatch($patch, $fullPath);
}
} else {
# Either a deletion, an addition or a binary change.
addDirectoriesIfNeeded(dirname($fullPath));
if ($isBinary) {
if ($isGit) {
handleGitBinaryChange($fullPath, $diffHashRef);
} else {
handleBinaryChange($fullPath, $patch) if $patch;
}
} elsif ($deletion) {
applyPatch($patch, $fullPath, ["--force"]) if $patch;
scmRemove($fullPath);
} elsif ($addition && $hasTextChunks) {
# Addition
rename($fullPath, "$fullPath.orig") if -e $fullPath;
applyPatch($patch, $fullPath);
unlink("$fullPath.orig") if -e "$fullPath.orig" && checksum($fullPath) eq checksum("$fullPath.orig");
scmAdd($fullPath);
my $escapedFullPath = escapeSubversionPath("$fullPath.orig");
# What is this for?
system("svn", "stat", "$escapedFullPath") if isSVN() && -e "$fullPath.orig";
}
}
scmToggleExecutableBit($fullPath, $diffHashRef->{executableBitDelta}) if defined($diffHashRef->{executableBitDelta});
}
sub removeDirectoriesIfNeeded()
{
foreach my $dir (reverse sort keys %checkedDirectories) {
if (isDirectoryEmptyForRemoval($dir)) {
scmRemove($dir);
}
}
}
# This could be made into a more general "status" call, except svn and git
# have different ideas about "moving" files which might get confusing.
sub scmWillDeleteFile($)
{
my ($path) = @_;
if (isSVN()) {
my $svnOutput = svnStatus($path);
return 1 if $svnOutput && substr($svnOutput, 0, 1) eq "D";
} elsif (isGit()) {
my $command = runCommand("git", "diff-index", "--name-status", "HEAD", "--", $path);
return 1 if $command->{stdout} && substr($command->{stdout}, 0, 1) eq "D";
}
return 0;
}
# Return whether the file at the given path is known to Git.
#
# This method outputs a message like the following to STDERR when
# returning false:
#
# "error: pathspec 'test.png' did not match any file(s) known to git.
# Did you forget to 'git add'?"
sub gitKnowsOfFile($)
{
my $path = shift;
`git ls-files --error-unmatch -- $path`;
my $exitStatus = exitStatus($?);
return $exitStatus == 0;
}
sub scmKnowsOfFile($)
{
my ($path) = @_;
if (isSVN()) {
my $svnOutput = svnStatus($path);
# This will match more than intended. ? might not be the first field in the status
if ($svnOutput && $svnOutput =~ m#\?\s+$path\n#) {
return 0;
}
# This does not handle errors well.
return 1;
} elsif (isGit()) {
my @result = callSilently(\&gitKnowsOfFile, $path);
return $result[0];
}
}
sub scmCopy($$)
{
my ($source, $destination) = @_;
if (isSVN()) {
my $escapedSource = escapeSubversionPath($source);
my $escapedDestination = escapeSubversionPath($destination);
system("svn", "copy", $escapedSource, $escapedDestination) == 0 or die "Failed to svn copy $escapedSource $escapedDestination.";
} elsif (isGit()) {
copy($source, $destination) or die "Failed to copy $source $destination.";
system("git", "add", $destination) == 0 or die "Failed to git add $destination.";
}
}
sub scmAdd($)
{
my ($path) = @_;
if (isSVN()) {
my $escapedPath = escapeSubversionPath($path);
system("svn", "add", $escapedPath) == 0 or die "Failed to svn add $escapedPath.";
} elsif (isGit()) {
system("git", "add", $path) == 0 or die "Failed to git add $path.";
}
}
sub scmRemove($)
{
my ($path) = @_;
if (isSVN()) {
# SVN is very verbose when removing directories. Squelch all output except the last line.
my $svnOutput;
my $escapedPath = escapeSubversionPath($path);
open SVN, "svn rm --force '$escapedPath' |" or die "svn rm --force '$escapedPath' failed!";
# Only print the last line. Subversion outputs all changed statuses below $dir
while (<SVN>) {
$svnOutput = $_;
}
close SVN;
print $svnOutput if $svnOutput;
} elsif (isGit()) {
# Git removes a directory if it becomes empty when the last file it contains is
# removed by `git rm`. In svn-apply this can happen when a directory is being
# removed in a patch, and all of the files inside of the directory are removed
# before attemping to remove the directory itself. In this case, Git will have
# already deleted the directory and `git rm` would exit with an error claiming
# there was no file. The --ignore-unmatch switch gracefully handles this case.
system("git", "rm", "--force", "--ignore-unmatch", $path) == 0 or die "Failed to git rm --force --ignore-unmatch $path.";
}
}