diff options
Diffstat (limited to 'git-cvsexportcommit.perl')
| -rwxr-xr-x | git-cvsexportcommit.perl | 265 |
1 files changed, 213 insertions, 52 deletions
diff --git a/git-cvsexportcommit.perl b/git-cvsexportcommit.perl index 67224b444..59b672213 100755 --- a/git-cvsexportcommit.perl +++ b/git-cvsexportcommit.perl @@ -1,28 +1,48 @@ #!/usr/bin/perl -w -# Known limitations: -# - does not propagate permissions -# - error handling has not been extensively tested -# - use strict; use Getopt::Std; use File::Temp qw(tempdir); use Data::Dumper; use File::Basename qw(basename dirname); +use File::Spec; +use Git; -unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){ - die "GIT_DIR is not defined or is unreadable"; -} - -our ($opt_h, $opt_P, $opt_p, $opt_v, $opt_c, $opt_f, $opt_a, $opt_m, $opt_d); +our ($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('hPpvcfam:d:'); +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 $opt_w; + +if ($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; + } + # 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', $opt_d); @@ -30,11 +50,6 @@ if ($opt_d) { @cvs = ('cvs'); } -# setup a tempdir -our ($tmpdir, $tmpdirname) = tempdir('git-cvsapplycommit-XXXXXX', - TMPDIR => 1, - CLEANUP => 1); - # resolve target commit my $commit; $commit = pop @ARGV; @@ -87,6 +102,7 @@ foreach my $line (@commit) { } } +my $noparent = "0000000000000000000000000000000000000000"; if ($parent) { my $found; # double check that it's a valid parent @@ -100,11 +116,22 @@ if ($parent) { } 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]; - } else { # or perhaps not! - die "This commit has more than one parent -- please name the parent you want to use explicitly"; + } 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 $parent\n"; # grab the commit message @@ -121,15 +148,24 @@ if ($opt_a) { } close MSG; -`git-diff-tree --binary -p $parent $commit >.cvsexportcommit.diff`;# || die "Cannot diff"; +if ($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 -my $fuzz = $opt_p ? 0 : 2; + +# 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 = $opt_p ? '' : '-C1'; print "Checking if patch will apply\n"; my @stat; -open APPLY, "GIT_DIR= git-apply -C$fuzz --binary --summary --numstat<.cvsexportcommit.diff|" || die "cannot patch"; +open APPLY, "GIT_DIR= git-apply $context --summary --numstat<.cvsexportcommit.diff|" || die "cannot patch"; @stat=<APPLY>; close APPLY || die "Cannot patch"; my (@bfiles,@files,@afiles,@dfiles); @@ -155,38 +191,123 @@ foreach my $p (@afiles) { } } +# ... check dirs, foreach my $d (@dirs) { if (-e $d) { $dirty = 1; warn "$d exists and is not a directory!\n"; } } -foreach my $f (@afiles) { - # This should return only one value - if ($f =~ m,(.*)/[^/]*$,) { - my $p = $1; - next if (grep { $_ eq $p } @dirs); + +# ... 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; } - my @status = grep(m/^File/, safe_pipe_capture(@cvs, '-q', 'status' ,$f)); - if (@status > 1) { warn 'Strange! cvs status returned more than one line?'}; - if (-d dirname $f and $status[0] !~ m/Status: Unknown$/ - and $status[0] !~ m/^File: no file /) { - $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: $status[0]\n"; + # "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 $f } @afiles; # TODO:we need to handle removed in cvs - my @status = grep(m/^File/, safe_pipe_capture(@cvs, '-q', 'status' ,$f)); - if (@status > 1) { warn 'Strange! cvs status returned more than one line?'}; - unless ($status[0] =~ m/Status: Up-to-date$/) { + unless (defined ($cvsstat{$f}) and $cvsstat{$f} eq "Up-to-date") { $dirty = 1; - warn "File $f not up to date in your CVS checkout!\n"; + 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"; $dirty = 0; @@ -196,10 +317,25 @@ if ($dirty) { } print "Applying\n"; -`GIT_DIR= git-apply -C$fuzz --binary --summary --numstat --apply <.cvsexportcommit.diff` || die "cannot patch"; +if ($opt_W) { + system("git checkout -q $commit^0") && die "cannot patch"; +} else { + `GIT_DIR= 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)) { $dirtypatch = 1; @@ -237,13 +373,16 @@ if ($dirtypatch) { 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 $cmd\n\n"; + print "\n cd \"$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 $cmd\n"; - print safe_pipe_capture(@cvs, 'commit', '-F', '.msg', @files); + print xargs_safe_pipe_capture([@cvs, 'commit', '-F', '.msg'], @files); if ($?) { die "Exiting: The commit did not succeed"; } @@ -257,9 +396,22 @@ if ($opt_c) { # clean up unlink(".cvsexportcommit.diff"); +if ($opt_W) { + system("git checkout $go_back_to") && die "cannot move back to $go_back_to"; + if (!($go_back_to =~ /^[0-9a-fA-F]{40}$/)) { + 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 ${\basename $0} [-h] [-p] [-v] [-c] [-f] [-m msgprefix] [ parent ] commit +Usage: GIT_DIR=/path/to/.git git cvsexportcommit [-h] [-p] [-v] [-c] [-f] [-u] [-k] [-w cvsworkdir] [-m msgprefix] [ parent ] commit END exit(1); } @@ -278,15 +430,24 @@ sub safe_pipe_capture { return wantarray ? @output : join('',@output); } -sub safe_pipe_capture_blob { - my $output; - if (my $pid = open my $child, '-|') { - local $/; - undef $/; - $output = (<$child>); - close $child or die join(' ',@_).": $! $?"; - } else { - exec(@_) or die "$! $?"; # exec() can fail the executable can't be found - } - return $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; } |