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-rwxr-xr-xgit-cvsexportcommit.perl467
1 files changed, 467 insertions, 0 deletions
diff --git a/git-cvsexportcommit.perl b/git-cvsexportcommit.perl
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index 0000000..289d4bc
--- /dev/null
+++ b/git-cvsexportcommit.perl
@@ -0,0 +1,467 @@
+#!/usr/bin/perl
+
+use 5.008;
+use strict;
+use warnings;
+use Getopt::Std;
+use File::Temp qw(tempdir);
+use Data::Dumper;
+use File::Basename qw(basename dirname);
+use File::Spec;
+use Git;
+
+our ($opt_h, $opt_P, $opt_p, $opt_v, $opt_c, $opt_f, $opt_a, $opt_m, $opt_d, $opt_u, $opt_w, $opt_W, $opt_k);
+
+getopts('uhPpvcfkam:d:w:W');
+
+$opt_h && usage();
+
+die "Need at least one commit identifier!" unless @ARGV;
+
+# Get git-config settings
+my $repo = Git->repository();
+$opt_w = $repo->config('cvsexportcommit.cvsdir') unless defined $opt_w;
+
+my $tmpdir = File::Temp::tempdir(CLEANUP => 1);
+my $hash_algo = $repo->config('extensions.objectformat') || 'sha1';
+my $hexsz = $hash_algo eq 'sha256' ? 64 : 40;
+
+if ($opt_w || $opt_W) {
+ # Remember where GIT_DIR is before changing to CVS checkout
+ unless ($ENV{GIT_DIR}) {
+ # No GIT_DIR set. Figure it out for ourselves
+ my $gd =`git rev-parse --git-dir`;
+ chomp($gd);
+ $ENV{GIT_DIR} = $gd;
+ }
+
+ # On MSYS, convert a Windows-style path to an MSYS-style path
+ # so that rel2abs() below works correctly.
+ if ($^O eq 'msys') {
+ $ENV{GIT_DIR} =~ s#^([[:alpha:]]):/#/$1/#;
+ }
+
+ # Make sure GIT_DIR is absolute
+ $ENV{GIT_DIR} = File::Spec->rel2abs($ENV{GIT_DIR});
+}
+
+if ($opt_w) {
+ if (! -d $opt_w."/CVS" ) {
+ die "$opt_w is not a CVS checkout";
+ }
+ chdir $opt_w or die "Cannot change to CVS checkout at $opt_w";
+}
+unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){
+ die "GIT_DIR is not defined or is unreadable";
+}
+
+
+my @cvs;
+if ($opt_d) {
+ @cvs = ('cvs', '-d', $opt_d);
+} else {
+ @cvs = ('cvs');
+}
+
+# resolve target commit
+my $commit;
+$commit = pop @ARGV;
+$commit = safe_pipe_capture('git', 'rev-parse', '--verify', "$commit^0");
+chomp $commit;
+if ($?) {
+ die "The commit reference $commit did not resolve!";
+}
+
+# resolve what parent we want
+my $parent;
+if (@ARGV) {
+ $parent = pop @ARGV;
+ $parent = safe_pipe_capture('git', 'rev-parse', '--verify', "$parent^0");
+ chomp $parent;
+ if ($?) {
+ die "The parent reference did not resolve!";
+ }
+}
+
+# find parents from the commit itself
+my @commit = safe_pipe_capture('git', 'cat-file', 'commit', $commit);
+my @parents;
+my $committer;
+my $author;
+my $stage = 'headers'; # headers, msg
+my $title;
+my $msg = '';
+
+foreach my $line (@commit) {
+ chomp $line;
+ if ($stage eq 'headers' && $line eq '') {
+ $stage = 'msg';
+ next;
+ }
+
+ if ($stage eq 'headers') {
+ if ($line =~ m/^parent ([0-9a-f]{$hexsz})$/) { # found a parent
+ push @parents, $1;
+ } elsif ($line =~ m/^author (.+) \d+ [-+]\d+$/) {
+ $author = $1;
+ } elsif ($line =~ m/^committer (.+) \d+ [-+]\d+$/) {
+ $committer = $1;
+ }
+ } else {
+ $msg .= $line . "\n";
+ unless ($title) {
+ $title = $line;
+ }
+ }
+}
+
+my $noparent = "0" x $hexsz;
+if ($parent) {
+ my $found;
+ # double check that it's a valid parent
+ foreach my $p (@parents) {
+ if ($p eq $parent) {
+ $found = 1;
+ last;
+ }; # found it
+ }
+ die "Did not find $parent in the parents for this commit!" if !$found and !$opt_P;
+} else { # we don't have a parent from the cmdline...
+ if (@parents == 1) { # it's safe to get it from the commit
+ $parent = $parents[0];
+ } elsif (@parents == 0) { # there is no parent
+ $parent = $noparent;
+ } else { # cannot choose automatically from multiple parents
+ die "This commit has more than one parent -- please name the parent you want to use explicitly";
+ }
+}
+
+my $go_back_to = 0;
+
+if ($opt_W) {
+ $opt_v && print "Resetting to $parent\n";
+ $go_back_to = `git symbolic-ref HEAD 2> /dev/null ||
+ git rev-parse HEAD` || die "Could not determine current branch";
+ system("git checkout -q $parent^0") && die "Could not check out $parent^0";
+}
+
+$opt_v && print "Applying to CVS commit $commit from parent $parent\n";
+
+# grab the commit message
+open(MSG, ">.msg") or die "Cannot open .msg for writing";
+if ($opt_m) {
+ print MSG $opt_m;
+}
+print MSG $msg;
+if ($opt_a) {
+ print MSG "\n\nAuthor: $author\n";
+ if ($author ne $committer) {
+ print MSG "Committer: $committer\n";
+ }
+}
+close MSG;
+
+if ($parent eq $noparent) {
+ `git diff-tree --binary -p --root $commit >.cvsexportcommit.diff`;# || die "Cannot diff";
+} else {
+ `git diff-tree --binary -p $parent $commit >.cvsexportcommit.diff`;# || die "Cannot diff";
+}
+
+## apply non-binary changes
+
+# In pedantic mode require all lines of context to match. In normal
+# mode, be compatible with diff/patch: assume 3 lines of context and
+# require at least one line match, i.e. ignore at most 2 lines of
+# context, like diff/patch do by default.
+my $context = $opt_p ? '' : '-C1';
+
+print "Checking if patch will apply\n";
+
+my @stat;
+open APPLY, "GIT_INDEX_FILE=$tmpdir/index git apply $context --summary --numstat<.cvsexportcommit.diff|" || die "cannot patch";
+@stat=<APPLY>;
+close APPLY || die "Cannot patch";
+my (@bfiles,@files,@afiles,@dfiles);
+chomp @stat;
+foreach (@stat) {
+ push (@bfiles,$1) if m/^-\t-\t(.*)$/;
+ push (@files, $1) if m/^-\t-\t(.*)$/;
+ push (@files, $1) if m/^\d+\t\d+\t(.*)$/;
+ push (@afiles,$1) if m/^ create mode [0-7]+ (.*)$/;
+ push (@dfiles,$1) if m/^ delete mode [0-7]+ (.*)$/;
+}
+map { s/^"(.*)"$/$1/g } @bfiles,@files;
+map { s/\\([0-7]{3})/sprintf('%c',oct $1)/eg } @bfiles,@files;
+
+# check that the files are clean and up to date according to cvs
+my $dirty;
+my @dirs;
+foreach my $p (@afiles) {
+ my $path = dirname $p;
+ while (!-d $path and ! grep { $_ eq $path } @dirs) {
+ unshift @dirs, $path;
+ $path = dirname $path;
+ }
+}
+
+# ... check dirs,
+foreach my $d (@dirs) {
+ if (-e $d) {
+ $dirty = 1;
+ warn "$d exists and is not a directory!\n";
+ }
+}
+
+# ... query status of all files that we have a directory for and parse output of 'cvs status' to %cvsstat.
+my @canstatusfiles;
+foreach my $f (@files) {
+ my $path = dirname $f;
+ next if (grep { $_ eq $path } @dirs);
+ push @canstatusfiles, $f;
+}
+
+my %cvsstat;
+if (@canstatusfiles) {
+ if ($opt_u) {
+ my @updated = xargs_safe_pipe_capture([@cvs, 'update'], @canstatusfiles);
+ print @updated;
+ }
+ # "cvs status" reorders the parameters, notably when there are multiple
+ # arguments with the same basename. So be precise here.
+
+ my %added = map { $_ => 1 } @afiles;
+ my %todo = map { $_ => 1 } @canstatusfiles;
+
+ while (%todo) {
+ my @canstatusfiles2 = ();
+ my %fullname = ();
+ foreach my $name (keys %todo) {
+ my $basename = basename($name);
+
+ # CVS reports files that don't exist in the current revision as
+ # "no file $basename" in its "status" output, so we should
+ # anticipate that. Totally unknown files will have a status
+ # "Unknown". However, if they exist in the Attic, their status
+ # will be "Up-to-date" (this means they were added once but have
+ # been removed).
+ $basename = "no file $basename" if $added{$basename};
+
+ $basename =~ s/^\s+//;
+ $basename =~ s/\s+$//;
+
+ if (!exists($fullname{$basename})) {
+ $fullname{$basename} = $name;
+ push (@canstatusfiles2, $name);
+ delete($todo{$name});
+ }
+ }
+ my @cvsoutput;
+ @cvsoutput = xargs_safe_pipe_capture([@cvs, 'status'], @canstatusfiles2);
+ foreach my $l (@cvsoutput) {
+ chomp $l;
+ next unless
+ my ($file, $status) = $l =~ /^File:\s+(.*\S)\s+Status: (.*)$/;
+
+ my $fullname = $fullname{$file};
+ print STDERR "Huh? Status '$status' reported for unexpected file '$file'\n"
+ unless defined $fullname;
+
+ # This response means the file does not exist except in
+ # CVS's attic, so set the status accordingly
+ $status = "In-attic"
+ if $file =~ /^no file /
+ && $status eq 'Up-to-date';
+
+ $cvsstat{$fullname{$file}} = $status
+ if defined $fullname{$file};
+ }
+ }
+}
+
+# ... Validate that new files have the correct status
+foreach my $f (@afiles) {
+ next unless defined(my $stat = $cvsstat{$f});
+
+ # This means the file has never been seen before
+ next if $stat eq 'Unknown';
+
+ # This means the file has been seen before but was removed
+ next if $stat eq 'In-attic';
+
+ $dirty = 1;
+ 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";
+ warn "Status was: $cvsstat{$f}\n";
+}
+
+# ... validate known files.
+foreach my $f (@files) {
+ next if grep { $_ eq $f } @afiles;
+ # TODO:we need to handle removed in cvs
+ unless (defined ($cvsstat{$f}) and $cvsstat{$f} eq "Up-to-date") {
+ $dirty = 1;
+ warn "File $f not up to date but has status '$cvsstat{$f}' in your CVS checkout!\n";
+ }
+
+ # Depending on how your GIT tree got imported from CVS you may
+ # have a conflict between expanded keywords in your CVS tree and
+ # unexpanded keywords in the patch about to be applied.
+ if ($opt_k) {
+ my $orig_file ="$f.orig";
+ rename $f, $orig_file;
+ open(FILTER_IN, "<$orig_file") or die "Cannot open $orig_file\n";
+ open(FILTER_OUT, ">$f") or die "Cannot open $f\n";
+ while (<FILTER_IN>)
+ {
+ my $line = $_;
+ $line =~ s/\$([A-Z][a-z]+):[^\$]+\$/\$$1\$/g;
+ print FILTER_OUT $line;
+ }
+ close FILTER_IN;
+ close FILTER_OUT;
+ }
+}
+
+if ($dirty) {
+ if ($opt_f) { warn "The tree is not clean -- forced merge\n";
+ $dirty = 0;
+ } else {
+ die "Exiting: your CVS tree is not clean for this merge.";
+ }
+}
+
+print "Applying\n";
+if ($opt_W) {
+ system("git checkout -q $commit^0") && die "cannot patch";
+} else {
+ `GIT_INDEX_FILE=$tmpdir/index git apply $context --summary --numstat --apply <.cvsexportcommit.diff` || die "cannot patch";
+}
+
+print "Patch applied successfully. Adding new files and directories to CVS\n";
+my $dirtypatch = 0;
+
+#
+# We have to add the directories in order otherwise we will have
+# problems when we try and add the sub-directory of a directory we
+# have not added yet.
+#
+# Luckily this is easy to deal with by sorting the directories and
+# dealing with the shortest ones first.
+#
+@dirs = sort { length $a <=> length $b} @dirs;
+
+foreach my $d (@dirs) {
+ if (system(@cvs,'add',$d)) {
+ $dirtypatch = 1;
+ warn "Failed to cvs add directory $d -- you may need to do it manually";
+ }
+}
+
+foreach my $f (@afiles) {
+ if (grep { $_ eq $f } @bfiles) {
+ system(@cvs, 'add','-kb',$f);
+ } else {
+ system(@cvs, 'add', $f);
+ }
+ if ($?) {
+ $dirtypatch = 1;
+ warn "Failed to cvs add $f -- you may need to do it manually";
+ }
+}
+
+foreach my $f (@dfiles) {
+ system(@cvs, 'rm', '-f', $f);
+ if ($?) {
+ $dirtypatch = 1;
+ warn "Failed to cvs rm -f $f -- you may need to do it manually";
+ }
+}
+
+print "Commit to CVS\n";
+print "Patch title (first comment line): $title\n";
+my @commitfiles = map { unless (m/\s/) { '\''.$_.'\''; } else { $_; }; } (@files);
+my $cmd = join(' ', @cvs)." commit -F .msg @commitfiles";
+
+if ($dirtypatch) {
+ print "NOTE: One or more hunks failed to apply cleanly.\n";
+ print "You'll need to apply the patch in .cvsexportcommit.diff manually\n";
+ print "using a patch program. After applying the patch and resolving the\n";
+ print "problems you may commit using:";
+ print "\n cd \"$opt_w\"" if $opt_w;
+ print "\n $cmd\n";
+ print "\n git checkout $go_back_to\n" if $go_back_to;
+ print "\n";
+ exit(1);
+}
+
+if ($opt_c) {
+ print "Autocommit\n $cmd\n";
+ print xargs_safe_pipe_capture([@cvs, 'commit', '-F', '.msg'], @files);
+ if ($?) {
+ die "Exiting: The commit did not succeed";
+ }
+ print "Committed successfully to CVS\n";
+ # clean up
+ unlink(".msg");
+} else {
+ print "Ready for you to commit, just run:\n\n $cmd\n";
+}
+
+# clean up
+unlink(".cvsexportcommit.diff");
+
+if ($opt_W) {
+ system("git checkout $go_back_to") && die "cannot move back to $go_back_to";
+ if (!($go_back_to =~ /^[0-9a-fA-F]{$hexsz}$/)) {
+ system("git symbolic-ref HEAD $go_back_to") &&
+ die "cannot move back to $go_back_to";
+ }
+}
+
+# CVS version 1.11.x and 1.12.x sleeps the wrong way to ensure the timestamp
+# used by CVS and the one set by subsequence file modifications are different.
+# If they are not different CVS will not detect changes.
+sleep(1);
+
+sub usage {
+ print STDERR <<END;
+usage: GIT_DIR=/path/to/.git git cvsexportcommit [-h] [-p] [-v] [-c] [-f] [-u] [-k] [-w cvsworkdir] [-m msgprefix] [ parent ] commit
+END
+ exit(1);
+}
+
+# An alternative to `command` that allows input to be passed as an array
+# to work around shell problems with weird characters in arguments
+# if the exec returns non-zero we die
+sub safe_pipe_capture {
+ my @output;
+ if (my $pid = open my $child, '-|') {
+ binmode($child, ":crlf");
+ @output = (<$child>);
+ close $child or die join(' ',@_).": $! $?";
+ } else {
+ exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
+ }
+ return wantarray ? @output : join('',@output);
+}
+
+sub xargs_safe_pipe_capture {
+ my $MAX_ARG_LENGTH = 65536;
+ my $cmd = shift;
+ my @output;
+ my $output;
+ while(@_) {
+ my @args;
+ my $length = 0;
+ while(@_ && $length < $MAX_ARG_LENGTH) {
+ push @args, shift;
+ $length += length($args[$#args]);
+ }
+ if (wantarray) {
+ push @output, safe_pipe_capture(@$cmd, @args);
+ }
+ else {
+ $output .= safe_pipe_capture(@$cmd, @args);
+ }
+ }
+ return wantarray ? @output : $output;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 01:46:28 +0000