blob: 56db50b43ecaea18f48f14f0088563ac850efcb2 [file] [log] [blame]
#!/usr/bin/perl -w
# 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 Computer, 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.
# "unpatch" script for WebKit Open Source Project, used to remove patches.
# Differences from invoking "patch -p0 -R":
#
# Handles added files (does a svn revert with additional logic to handle local changes).
# Handles added directories (does a svn revert and a rmdir).
# Handles removed files (does a svn revert with additional logic to handle local changes).
# Handles removed directories (does a svn revert).
# 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, and the entry date is reset in
# the patch before it is applied (svn-apply sets it when applying a patch).
# 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).
# Use version numbers in the patch file and do a 3-way merge.
# When reversing an addition, check that the file matches what's being removed.
# Notice a patch that's being unapplied 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 changes
use strict;
use warnings;
use Cwd;
use Digest::MD5;
use Fcntl qw(:DEFAULT :seek);
use File::Basename;
use File::Spec;
use File::Temp qw(tempfile);
use Getopt::Long;
use FindBin;
use lib $FindBin::Bin;
use VCSUtils;
sub checksum($);
sub patch($);
sub revertDirectories();
sub unapplyPatch($$;$);
sub unsetChangeLogDate($$);
my $force = 0;
my $showHelp = 0;
my $optionParseSuccess = GetOptions(
"force!" => \$force,
"help!" => \$showHelp
);
if (!$optionParseSuccess || $showHelp) {
print STDERR basename($0) . " [-h|--help] [--force] patch1 [patch2 ...]\n";
exit 1;
}
my $globalExitStatus = 0;
my $repositoryRootPath = determineVCSRoot();
my @copiedFiles;
my %directoriesToCheck;
# 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";
my $preparedPatchHash = prepareParsedPatch($force, @diffHashRefs);
my @copyDiffHashRefs = @{$preparedPatchHash->{copyDiffHashRefs}};
my @nonCopyDiffHashRefs = @{$preparedPatchHash->{nonCopyDiffHashRefs}};
for my $diffHashRef (@nonCopyDiffHashRefs) {
patch($diffHashRef);
}
# Handle copied and moved files last since they may have had post-copy changes that have now been unapplied
for my $diffHashRef (@copyDiffHashRefs) {
patch($diffHashRef);
}
if (isSVN()) {
revertDirectories();
}
exit $globalExitStatus;
sub checksum($)
{
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;
}
# Args:
# $diffHashRef: a diff hash reference of the type returned by parsePatch().
sub patch($)
{
my ($diffHashRef) = @_;
# Make sure $patch is initialized to some value. There is no
# svnConvertedText when reversing an svn copy/move.
my $patch = $diffHashRef->{svnConvertedText} || "";
my $fullPath = $diffHashRef->{indexPath};
my $isSvnBinary = $diffHashRef->{isBinary} && $diffHashRef->{isSvn};
my $hasTextChunks = $patch && $diffHashRef->{numTextChunks};
$directoriesToCheck{dirname($fullPath)} = 1;
my $deletion = 0;
my $addition = 0;
$addition = 1 if ($diffHashRef->{isNew} || $diffHashRef->{copiedFromPath} || $patch =~ /\n@@ -0,0 .* @@/);
$deletion = 1 if ($diffHashRef->{isDeletion} || $patch =~ /\n@@ .* \+0,0 @@/);
if (!$addition && !$deletion && !$isSvnBinary && $hasTextChunks) {
# Standard patch, patch tool can handle this.
if (basename($fullPath) eq "ChangeLog") {
my $changeLogDotOrigExisted = -f "${fullPath}.orig";
my $changeLogHash = fixChangeLogPatch($patch);
unapplyPatch(unsetChangeLogDate($fullPath, $changeLogHash->{patch}), $fullPath, ["--fuzz=3"]);
unlink("${fullPath}.orig") if (! $changeLogDotOrigExisted);
} else {
unapplyPatch($patch, $fullPath);
}
} else {
# Either a deletion, an addition or a binary change.
my $escapedFullPath = escapeSubversionPath($fullPath);
# FIXME: Add support for Git binary files.
if ($isSvnBinary) {
# Reverse binary change
unlink($fullPath) if (-e $fullPath);
system "svn", "revert", $escapedFullPath;
} elsif ($deletion) {
# Reverse deletion
rename($fullPath, "$fullPath.orig") if -e $fullPath;
unapplyPatch($patch, $fullPath);
# If we don't ask for the filehandle here, we always get a warning.
my ($fh, $tempPath) = tempfile(basename($fullPath) . "-XXXXXXXX",
DIR => dirname($fullPath), UNLINK => 1);
close($fh);
# Keep the version from the patch in case it's different from svn.
rename($fullPath, $tempPath);
system "svn", "revert", $escapedFullPath;
rename($tempPath, $fullPath);
# This works around a bug in the svn client.
# [Issue 1960] file modifications get lost due to FAT 2s time resolution
# http://subversion.tigris.org/issues/show_bug.cgi?id=1960
system "touch", $fullPath;
# Remove $fullPath.orig if it is the same as $fullPath
unlink("$fullPath.orig") if -e "$fullPath.orig" && checksum($fullPath) eq checksum("$fullPath.orig");
# Show status if the file is modifed
system "svn", "stat", $escapedFullPath;
} elsif ($addition) {
# Reverse addition
#
# FIXME: This should use the same logic as svn-apply's deletion
# code. In particular, svn-apply's scmRemove() subroutine
# should be used here.
unapplyPatch($patch, $fullPath, ["--force"]) if $patch;
unlink($fullPath) if -z $fullPath;
system "svn", "revert", $escapedFullPath;
}
}
scmToggleExecutableBit($fullPath, -1 * $diffHashRef->{executableBitDelta}) if defined($diffHashRef->{executableBitDelta});
}
sub revertDirectories()
{
chdir $repositoryRootPath;
my %checkedDirectories;
foreach my $path (reverse sort keys %directoriesToCheck) {
my @dirs = File::Spec->splitdir($path);
while (scalar @dirs) {
my $dir = File::Spec->catdir(@dirs);
pop(@dirs);
next if (exists $checkedDirectories{$dir});
if (-d $dir) {
my $svnOutput = svnStatus($dir);
my $escapedDir = escapeSubversionPath($dir);
if ($svnOutput && $svnOutput =~ m#A\s+$dir\n#) {
system "svn", "revert", $escapedDir;
rmdir $dir;
}
elsif ($svnOutput && $svnOutput =~ m#D\s+$dir\n#) {
system "svn", "revert", $escapedDir;
}
else {
# Modification
print $svnOutput if $svnOutput;
}
$checkedDirectories{$dir} = 1;
}
else {
die "'$dir' 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.
# Do not include --reverse in this array.
sub unapplyPatch($$;$)
{
my ($patch, $pathRelativeToRoot, $options) = @_;
my $optionalArgs = {options => $options, ensureForce => $force, shouldReverse => 1};
my $exitStatus = runPatchCommand($patch, $repositoryRootPath, $pathRelativeToRoot, $optionalArgs);
if ($exitStatus) {
$globalExitStatus = $exitStatus;
}
}
sub unsetChangeLogDate($$)
{
my $fullPath = shift;
my $patch = shift;
my $newDate;
sysopen(CHANGELOG, $fullPath, O_RDONLY) or die "Failed to open $fullPath: $!";
sysseek(CHANGELOG, 0, SEEK_SET);
my $byteCount = sysread(CHANGELOG, $newDate, 10);
die "Failed reading $fullPath: $!" if !$byteCount || $byteCount != 10;
close(CHANGELOG);
$patch =~ s/(\n\+)\d{4}-[^-]{2}-[^-]{2}( )/$1$newDate$2/;
return $patch;
}