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#!/usr/bin/perl -w |
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|
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# This script will transfer changes from Subversion repository |
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# to CVS repository (e.g. SourceForge) while preserving commit |
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# logs. |
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# |
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# Based on original shell version by Tollef Fog Heen available at |
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# http://raw.no/personal/blog |
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# |
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# 2004-03-09 Dobrica Pavlinusic <dpavlin@rot13.org> |
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# |
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# documentation is after __END__ |
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|
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use strict; |
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use File::Temp qw/ tempdir /; |
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use Data::Dumper; |
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use XML::Simple; |
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|
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if (@ARGV < 2) { |
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print "usage: $0 SVN_URL CVSROOT CVSREPOSITORY\n"; |
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exit 1; |
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} |
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|
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my ($SVNROOT,$CVSROOT, $CVSREP) = @ARGV; |
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|
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if ($SVNROOT !~ m,^[\w+]+:///*\w+,) { |
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print "ERROR: invalid svn root $SVNROOT\n"; |
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exit 1; |
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} |
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|
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my $TMPDIR=tempdir( "/tmp/checkoutXXXXX", CLEANUP => 1 ); |
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|
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chdir($TMPDIR) || die "can't cd to $TMPDIR: $!"; |
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|
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# cvs command with root |
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my $cvs="cvs -d $CVSROOT"; |
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|
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# |
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# sub to do logging and system calls |
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# |
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sub log_system($$) { |
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my ($cmd,$errmsg) = @_; |
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print STDERR "## $cmd\n"; |
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system($cmd) == 0 || die "$errmsg: $!"; |
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} |
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|
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# |
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# sub to commit .svn rev file later |
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# |
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sub commit_svnrev { |
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my $rev = shift @_; |
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my $add_new = shift @_; |
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|
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die "commit_svnrev needs revision" if (! defined($rev)); |
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|
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open(SVNREV,"> .svnrev") || die "can't open $TMPDIR/$CVSREP/.svnrev: $!"; |
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print SVNREV $rev; |
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close(SVNREV); |
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|
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my $path=".svnrev"; |
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|
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if ($add_new) { |
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system "$cvs add $path" || die "cvs add of $path failed: $!"; |
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} else { |
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my $msg="subversion revision $rev commited to CVS"; |
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print "$msg\n"; |
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system "$cvs commit -m '$msg' $path" || die "cvs commit of $path failed: $!"; |
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} |
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} |
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|
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# ok, now do the checkout |
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|
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log_system("$cvs -q checkout $CVSREP", "cvs checkout failed"); |
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|
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chdir($CVSREP) || die "can't cd to $TMPDIR/$CVSREP: $!"; |
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|
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|
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my $rev; |
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|
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# check if svnrev exists |
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if (! -e ".svnrev") { |
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print <<_USAGE_; |
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|
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Your CVS repository doesn't have .svnrev file! |
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|
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This file is used to keep CVS repository and Subversion in sync, so |
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that only newer changes will be commited. |
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|
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It's quote possible that this is first svn2cvs run for this repository. |
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If so, you will have to identify correct svn revision which |
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corresponds to current version of CVS repository that has just |
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been checkouted. |
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|
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If you migrated your cvs repository to svn using cvs2svn, this will be |
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last Subversion revision. If this is initial run of conversion of |
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Subversion repository to CVS, correct revision is 0. |
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|
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_USAGE_ |
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|
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print "svn revision corresponding to CVS [abort]: "; |
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my $in = <STDIN>; |
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chomp($in); |
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if ($in !~ /^\d+$/) { |
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print "Aborting: revision not a number\n"; |
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exit 1; |
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} else { |
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$rev = $in; |
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commit_svnrev($rev,1); # create new |
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} |
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} else { |
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open(SVNREV,".svnrev") || die "can't open $TMPDIR/$CVSREP/.svnrev: $!"; |
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$rev = <SVNREV>; |
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chomp($rev); |
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close(SVNREV); |
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} |
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|
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print "Starting after revision $rev\n"; |
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$rev++; |
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|
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|
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# |
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# FIXME!! HEAD should really be next verison and loop because this way we |
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# loose multiple edits of same file and corresponding messages. On the |
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# other hand, if you want to compress your traffic to CVS server and don't |
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# case much about accuracy and completnes of logs there, this might |
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# be good. YMMV |
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# |
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open(LOG, "svn log -r $rev:HEAD -v --xml $SVNROOT |") || die "svn log for repository $SVNROOT failed: $!"; |
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my $log; |
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while(<LOG>) { |
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$log .= $_; |
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} |
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close(LOG); |
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|
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my $xml = XMLin($log, ForceArray => [ 'logentry', 'path' ]); |
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|
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|
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#=begin log_example |
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# |
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#------------------------------------------------------------------------ |
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#r256 | dpavlin | 2004-03-09 13:18:17 +0100 (Tue, 09 Mar 2004) | 2 lines |
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# |
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#ported r254 from hidra branch |
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# |
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#=cut |
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|
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my $fmt = "\n" . "-" x 79 . "\nr%5s| %8s | %s\n\n%s\n"; |
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|
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if (! $xml->{'logentry'}) { |
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print "no newer log entries in Subversion repostory. CVS is current\n"; |
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exit 0; |
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} |
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|
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# check if file exists in CVS/Entries |
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sub in_entries($) { |
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my $path = shift; |
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if ($path !~ m,^(.*?/*)([^/]+)$,) { |
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die "can't split '$path' to dir and file!"; |
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} else { |
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my ($d,$f) = ($1,$2); |
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if ($d !~ m,/$,) { |
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$d .= "/"; |
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} |
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open(E, $d."CVS/Entries") || die "can't open ${d}CVS/Entries: $!"; |
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while(<E>) { |
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return(1) if (m,^/$f/,); |
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} |
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close(E); |
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return 0; |
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} |
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} |
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|
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foreach my $e (@{$xml->{'logentry'}}) { |
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die "BUG: revision from .svnrev ($rev) greater than from subversion (".$e->{'revision'}.")" if ($rev > $e->{'revision'}); |
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$rev = $e->{'revision'}; |
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log_system("svn export --force -q -r $rev $SVNROOT $TMPDIR/$CVSREP", "svn export of revision $rev failed"); |
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|
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# deduce name of svn directory |
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my $SVNREP = ""; |
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my $tmpsvn = $SVNROOT || die "BUG: SVNROOT empty!"; |
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my $tmppath = $e->{'paths'}->{'path'}->[0]->{'content'} || die "BUG: tmppath empty!"; |
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do { |
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print "## tmppath: $tmppath tmpsvn: $tmpsvn SVNREP: $SVNREP\n"; |
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if ($tmpsvn =~ s,(/\w+/*)$,,) { |
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$SVNREP .= $1; |
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} else { |
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die "ERROR: can't deduce svn dir from $SVNROOT.\nUsing root of snv repository for current version instead of /trunk/ is not supported.\n"; |
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} |
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} until ($tmppath =~ m/^$SVNREP/); |
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|
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print "NOTICE: using $SVNREP as directory for svn\n"; |
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|
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printf($fmt, $e->{'revision'}, $e->{'author'}, $e->{'date'}, $e->{'msg'}); |
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foreach my $p (@{$e->{'paths'}->{'path'}}) { |
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my ($action,$path) = ($p->{'action'},$p->{'content'}); |
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|
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print "svn2cvs: $action $path\n"; |
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|
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# prepare path and message |
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my $file = $path; |
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$path =~ s,^$SVNREP/*,, || die "BUG: can't strip SVNREP from path"; |
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|
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if (! $path) { |
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print "NOTICE: skipped this operation. Probably trunk creation\n"; |
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next; |
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} |
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|
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my $msg = $e->{'msg'}; |
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$msg =~ s/'/'\\''/g; # quote " |
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|
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if ($action =~ /M/) { |
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print "svn2cvs: modify $path -- nop\n"; |
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} elsif ($action =~ /A/) { |
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if (-d $path) { |
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chdir($path) || die "can't cd into dir $path for import: $!"; |
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log_system("$cvs import -d -m '$msg' $CVSREP/$path svn r$rev", "cvs import of $path failed"); |
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chdir("$TMPDIR") || die "can't cd to $TMPDIR/$CVSREP: $!"; |
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log_system("$cvs checkout $CVSREP/$path", "cvs checkout of imported dir $path failed"); |
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chdir("$TMPDIR/$CVSREP") || die "can't cd back to $TMPDIR/$CVSREP: $!"; |
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} elsif ($path =~ m,^(.+)/[^/]+$, && ! -e "$1/CVS/Root") { |
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my $dir = $1; |
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in_entries($dir) || log_system("$cvs add $dir", "cvs add of dir $dir failed"); |
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in_entries($path) || log_system("$cvs add $path", "cvs add of $path failed"); |
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} else { |
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in_entries($path) || log_system("$cvs add $path", "cvs add of $path failed"); |
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} |
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} elsif ($action =~ /D/) { |
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unlink $path || die "can't delete $path: $!"; |
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log_system("$cvs delete $path", "cvs delete of $path failed"); |
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} else { |
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print "WARNING: action $action not implemented on $path. Bug or missing feature of $0\n"; |
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} |
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|
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# now commit changes |
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log_system("$cvs commit -m '$msg' $path", "cvs commit of $path failed"); |
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|
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} |
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|
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commit_svnrev($rev); |
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} |
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|
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__END__ |
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|
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=pod |
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|
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=head1 NAME |
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|
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svn2cvs - save subversion commits to (read-only) cvs repository |
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|
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=head1 SYNOPSIS |
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|
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./svn2cvs.pl SVN_URL CVSROOT CVSREPOSITORY |
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|
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Usage example (used to self-host this script): |
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|
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./svn2cvs.pl file:///home/dpavlin/private/svn/svn2cvs/trunk/ \ |
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:pserver:dpavlin@cvs.tigris.org:/cvs svn2cvs/src |
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|
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=head1 DESCRIPTION |
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|
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This script will allow you to commit changes made to Subversion repository also to (read-only) CVS repository manually or from Subversion's C<post-commit> hook. |
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|
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It's using F<.svnrev> file (which will be created on first run) in |
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B<CVSROOT/CVSREPOSITORY> to store last Subversion revision which was |
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committed into CVS. |
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|
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One run will do following things: |
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|
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=over 4 |
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|
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=item * |
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checkout B<CVSREPOSITORY> from B<CVSROOT> to temporary directory |
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|
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=item * |
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check if F<.svnrev> file exists and create it if it doesn't |
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|
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=item * |
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loop through all revisions from current in B<CVSROOT/CVSREPOSITORY> (using |
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F<.svnrev>) up to B<HEAD> (current one) |
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|
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=over 5 |
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|
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=item * |
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checkout next Subversion revision from B<SVN_URL> over CVS checkout |
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temporary directory |
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|
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=item * |
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make modification (add and/or delete) done in that revision |
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|
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=item * |
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commit modification (added, deleted or modified files/dirs) while |
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preserving original message from CVS |
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|
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=item * |
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update F<.svnrev> to match current revision |
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|
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=back |
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|
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=item * |
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cleanup temporary directory |
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|
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=back |
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|
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If checkout fails for some reason (e.g. flaky ssh connection), you will |
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still have valid CVS repository, so all you have to do is run B<svn2cvs.pl> |
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again. |
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|
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=head1 WARNINGS |
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|
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"Cheap" copy operations in Subversion are not at all cheap in CVS. They will |
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create multiple copies of files in CVS repository! |
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|
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=head1 RELATED PROJECTS |
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|
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B<Subversion> L<http://subversion.tigris.org/> version control system that is a |
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compelling replacement for CVS in the open source community. |
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|
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B<cvs2svn> L<http://cvs2svn.tigris.org/> converts a CVS repository to a |
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Subversion repository. It is designed for one-time conversions, not for |
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repeated synchronizations between CVS and Subversion. |
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|
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=head1 AUTHOR |
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|
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Dobrica Pavlinusic <dpavlin@rot13.org> |
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|
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L<https://www.rot13.org/~dpavlin/> |
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|
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=head1 LICENSE |
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|
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This product is licensed under GNU Public License (GPL) v2 or later. |
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|
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=cut |
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