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![Steffen Prohaska](/assets/img/avatar_default.png)
Runtime is now independent of the number of modified files. The old implementation executed 'cvs status' for each file touched by the patch to be applied. The new code calls 'cvs status' only once with all touched files and parses cvs's output to collect all available status information. Signed-off-by: Steffen Prohaska <prohaska@zib.de> Signed-off-by: Junio C Hamano <junkio@cox.net>
313 lines
8.1 KiB
Perl
Executable file
313 lines
8.1 KiB
Perl
Executable file
#!/usr/bin/perl -w
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# Known limitations:
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# - does not propagate permissions
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# - error handling has not been extensively tested
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#
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use strict;
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use Getopt::Std;
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use File::Temp qw(tempdir);
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use Data::Dumper;
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use File::Basename qw(basename dirname);
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unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){
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die "GIT_DIR is not defined or is unreadable";
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}
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our ($opt_h, $opt_P, $opt_p, $opt_v, $opt_c, $opt_f, $opt_a, $opt_m, $opt_d);
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getopts('hPpvcfam:d:');
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$opt_h && usage();
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die "Need at least one commit identifier!" unless @ARGV;
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my @cvs;
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if ($opt_d) {
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@cvs = ('cvs', '-d', $opt_d);
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} else {
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@cvs = ('cvs');
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}
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# setup a tempdir
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our ($tmpdir, $tmpdirname) = tempdir('git-cvsapplycommit-XXXXXX',
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TMPDIR => 1,
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CLEANUP => 1);
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# resolve target commit
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my $commit;
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$commit = pop @ARGV;
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$commit = safe_pipe_capture('git-rev-parse', '--verify', "$commit^0");
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chomp $commit;
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if ($?) {
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die "The commit reference $commit did not resolve!";
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}
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# resolve what parent we want
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my $parent;
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if (@ARGV) {
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$parent = pop @ARGV;
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$parent = safe_pipe_capture('git-rev-parse', '--verify', "$parent^0");
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chomp $parent;
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if ($?) {
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die "The parent reference did not resolve!";
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}
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}
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# find parents from the commit itself
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my @commit = safe_pipe_capture('git-cat-file', 'commit', $commit);
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my @parents;
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my $committer;
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my $author;
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my $stage = 'headers'; # headers, msg
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my $title;
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my $msg = '';
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foreach my $line (@commit) {
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chomp $line;
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if ($stage eq 'headers' && $line eq '') {
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$stage = 'msg';
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next;
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}
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if ($stage eq 'headers') {
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if ($line =~ m/^parent (\w{40})$/) { # found a parent
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push @parents, $1;
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} elsif ($line =~ m/^author (.+) \d+ [-+]\d+$/) {
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$author = $1;
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} elsif ($line =~ m/^committer (.+) \d+ [-+]\d+$/) {
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$committer = $1;
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}
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} else {
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$msg .= $line . "\n";
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unless ($title) {
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$title = $line;
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}
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}
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}
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if ($parent) {
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my $found;
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# double check that it's a valid parent
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foreach my $p (@parents) {
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if ($p eq $parent) {
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$found = 1;
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last;
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}; # found it
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}
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die "Did not find $parent in the parents for this commit!" if !$found and !$opt_P;
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} else { # we don't have a parent from the cmdline...
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if (@parents == 1) { # it's safe to get it from the commit
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$parent = $parents[0];
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} else { # or perhaps not!
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die "This commit has more than one parent -- please name the parent you want to use explicitly";
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}
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}
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$opt_v && print "Applying to CVS commit $commit from parent $parent\n";
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# grab the commit message
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open(MSG, ">.msg") or die "Cannot open .msg for writing";
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if ($opt_m) {
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print MSG $opt_m;
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}
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print MSG $msg;
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if ($opt_a) {
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print MSG "\n\nAuthor: $author\n";
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if ($author ne $committer) {
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print MSG "Committer: $committer\n";
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}
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}
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close MSG;
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`git-diff-tree --binary -p $parent $commit >.cvsexportcommit.diff`;# || die "Cannot diff";
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## apply non-binary changes
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# In pedantic mode require all lines of context to match. In normal
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# mode, be compatible with diff/patch: assume 3 lines of context and
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# require at least one line match, i.e. ignore at most 2 lines of
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# context, like diff/patch do by default.
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my $context = $opt_p ? '' : '-C1';
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print "Checking if patch will apply\n";
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my @stat;
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open APPLY, "GIT_DIR= git-apply $context --binary --summary --numstat<.cvsexportcommit.diff|" || die "cannot patch";
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@stat=<APPLY>;
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close APPLY || die "Cannot patch";
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my (@bfiles,@files,@afiles,@dfiles);
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chomp @stat;
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foreach (@stat) {
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push (@bfiles,$1) if m/^-\t-\t(.*)$/;
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push (@files, $1) if m/^-\t-\t(.*)$/;
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push (@files, $1) if m/^\d+\t\d+\t(.*)$/;
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push (@afiles,$1) if m/^ create mode [0-7]+ (.*)$/;
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push (@dfiles,$1) if m/^ delete mode [0-7]+ (.*)$/;
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}
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map { s/^"(.*)"$/$1/g } @bfiles,@files;
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map { s/\\([0-7]{3})/sprintf('%c',oct $1)/eg } @bfiles,@files;
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# check that the files are clean and up to date according to cvs
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my $dirty;
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my @dirs;
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foreach my $p (@afiles) {
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my $path = dirname $p;
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while (!-d $path and ! grep { $_ eq $path } @dirs) {
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unshift @dirs, $path;
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$path = dirname $path;
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}
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}
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# ... check dirs,
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foreach my $d (@dirs) {
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if (-e $d) {
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$dirty = 1;
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warn "$d exists and is not a directory!\n";
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}
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}
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# ... query status of all files that we have a directory for and parse output of 'cvs status' to %cvsstat.
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my @canstatusfiles;
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foreach my $f (@files) {
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my $path = dirname $f;
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next if (grep { $_ eq $path } @dirs);
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push @canstatusfiles, $f;
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}
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my %cvsstat;
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if (@canstatusfiles) {
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my @cvsoutput;
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@cvsoutput= safe_pipe_capture(@cvs, 'status', @canstatusfiles);
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my $matchcount = 0;
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foreach my $l (@cvsoutput) {
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chomp $l;
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if ( $l =~ /^File:/ and $l =~ /Status: (.*)$/ ) {
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$cvsstat{$canstatusfiles[$matchcount]} = $1;
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$matchcount++;
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}
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}
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}
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# ... validate new files,
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foreach my $f (@afiles) {
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if (defined ($cvsstat{$f}) and $cvsstat{$f} ne "Unknown") {
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$dirty = 1;
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warn "File $f is already known in your CVS checkout -- perhaps it has been added by another user. Or this may indicate that it exists on a different branch. If this is the case, use -f to force the merge.\n";
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warn "Status was: $cvsstat{$f}\n";
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}
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}
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# ... validate known files.
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foreach my $f (@files) {
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next if grep { $_ eq $f } @afiles;
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# TODO:we need to handle removed in cvs
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unless (defined ($cvsstat{$f}) and $cvsstat{$f} eq "Up-to-date") {
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$dirty = 1;
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warn "File $f not up to date but has status '$cvsstat{$f}' in your CVS checkout!\n";
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}
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}
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if ($dirty) {
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if ($opt_f) { warn "The tree is not clean -- forced merge\n";
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$dirty = 0;
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} else {
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die "Exiting: your CVS tree is not clean for this merge.";
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}
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}
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print "Applying\n";
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`GIT_DIR= git-apply $context --binary --summary --numstat --apply <.cvsexportcommit.diff` || die "cannot patch";
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print "Patch applied successfully. Adding new files and directories to CVS\n";
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my $dirtypatch = 0;
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foreach my $d (@dirs) {
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if (system(@cvs,'add',$d)) {
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$dirtypatch = 1;
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warn "Failed to cvs add directory $d -- you may need to do it manually";
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}
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}
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foreach my $f (@afiles) {
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if (grep { $_ eq $f } @bfiles) {
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system(@cvs, 'add','-kb',$f);
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} else {
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system(@cvs, 'add', $f);
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}
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if ($?) {
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$dirtypatch = 1;
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warn "Failed to cvs add $f -- you may need to do it manually";
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}
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}
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foreach my $f (@dfiles) {
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system(@cvs, 'rm', '-f', $f);
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if ($?) {
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$dirtypatch = 1;
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warn "Failed to cvs rm -f $f -- you may need to do it manually";
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}
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}
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print "Commit to CVS\n";
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print "Patch title (first comment line): $title\n";
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my @commitfiles = map { unless (m/\s/) { '\''.$_.'\''; } else { $_; }; } (@files);
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my $cmd = join(' ', @cvs)." commit -F .msg @commitfiles";
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if ($dirtypatch) {
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print "NOTE: One or more hunks failed to apply cleanly.\n";
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print "You'll need to apply the patch in .cvsexportcommit.diff manually\n";
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print "using a patch program. After applying the patch and resolving the\n";
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print "problems you may commit using:";
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print "\n $cmd\n\n";
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exit(1);
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}
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if ($opt_c) {
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print "Autocommit\n $cmd\n";
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print safe_pipe_capture(@cvs, 'commit', '-F', '.msg', @files);
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if ($?) {
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die "Exiting: The commit did not succeed";
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}
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print "Committed successfully to CVS\n";
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# clean up
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unlink(".msg");
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} else {
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print "Ready for you to commit, just run:\n\n $cmd\n";
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}
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# clean up
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unlink(".cvsexportcommit.diff");
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sub usage {
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print STDERR <<END;
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Usage: GIT_DIR=/path/to/.git ${\basename $0} [-h] [-p] [-v] [-c] [-f] [-m msgprefix] [ parent ] commit
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END
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exit(1);
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}
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# An alternative to `command` that allows input to be passed as an array
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# to work around shell problems with weird characters in arguments
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# if the exec returns non-zero we die
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sub safe_pipe_capture {
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my @output;
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if (my $pid = open my $child, '-|') {
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@output = (<$child>);
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close $child or die join(' ',@_).": $! $?";
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} else {
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exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
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}
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return wantarray ? @output : join('',@output);
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}
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sub safe_pipe_capture_blob {
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my $output;
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if (my $pid = open my $child, '-|') {
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local $/;
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undef $/;
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$output = (<$child>);
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close $child or die join(' ',@_).": $! $?";
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} else {
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exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
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}
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return $output;
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}
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