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authorMatthias Urlichs <smurf@smurf.noris.de>2005-10-10 09:40:43 (GMT)
committerMatthias Urlichs <smurf@smurf.noris.de>2005-10-10 09:40:43 (GMT)
commiteaf718f3ece277462de4e47391e5a965bbbaa297 (patch)
tree5b68436a0951be41262fe9a9b0426edaa25b5853 /git-svnimport.perl
parent89764f5d8b0ca8600e3a200e9f863c3c7a3ff5e8 (diff)
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New: git-svnimport.
As the name suggests, this script imports from SVN. Only "normal" SVN repositories (with single trunk/, branches/, and tags/ subdrectories) are supported. Incremental imports require preserving the file .git/svn2git. Signed-Off-by: Matthias Urlichs <smurf@smurf.noris.de>
Diffstat (limited to 'git-svnimport.perl')
-rwxr-xr-xgit-svnimport.perl671
1 files changed, 671 insertions, 0 deletions
diff --git a/git-svnimport.perl b/git-svnimport.perl
new file mode 100755
index 0000000..08645f7
--- /dev/null
+++ b/git-svnimport.perl
@@ -0,0 +1,671 @@
+#!/usr/bin/perl -w
+
+# This tool is copyright (c) 2005, Matthias Urlichs.
+# It is released under the Gnu Public License, version 2.
+#
+# The basic idea is to pull and analyze SVN changes.
+#
+# Checking out the files is done by a single long-running CVS connection
+# / server process.
+#
+# The head revision is on branch "origin" by default.
+# You can change that with the '-o' option.
+
+require v5.8.0; # for shell-safe open("-|",LIST)
+use strict;
+use warnings;
+use Getopt::Std;
+use File::Spec;
+use File::Temp qw(tempfile);
+use File::Path qw(mkpath);
+use File::Basename qw(basename dirname);
+use Time::Local;
+use IO::Pipe;
+use POSIX qw(strftime dup2);
+use IPC::Open2;
+use SVN::Core;
+use SVN::Ra;
+
+$SIG{'PIPE'}="IGNORE";
+$ENV{'TZ'}="UTC";
+
+our($opt_h,$opt_o,$opt_v,$opt_u,$opt_C,$opt_i,$opt_m,$opt_M,$opt_t,$opt_T,$opt_b);
+
+sub usage() {
+ print STDERR <<END;
+Usage: ${\basename $0} # fetch/update GIT from CVS
+ [-o branch-for-HEAD] [-h] [-v]
+ [-C GIT_repository] [-t tagname] [-T trunkname] [-b branchname]
+ [-i] [-u] [-s subst] [-m] [-M regex] [SVN_URL]
+END
+ exit(1);
+}
+
+getopts("b:C:hivmM:o:t:T:u") or usage();
+usage if $opt_h;
+
+my $tag_name = $opt_t || "tags";
+my $trunk_name = $opt_T || "trunk";
+my $branch_name = $opt_b || "branches";
+
+@ARGV <= 1 or usage();
+
+$opt_o ||= "origin";
+my $git_tree = $opt_C;
+$git_tree ||= ".";
+
+my $cvs_tree;
+if ($#ARGV == 0) {
+ $cvs_tree = $ARGV[0];
+} elsif (-f 'CVS/Repository') {
+ open my $f, '<', 'CVS/Repository' or
+ die 'Failed to open CVS/Repository';
+ $cvs_tree = <$f>;
+ chomp $cvs_tree;
+ close $f;
+} else {
+ usage();
+}
+
+our @mergerx = ();
+if ($opt_m) {
+ @mergerx = ( qr/\W(?:from|of|merge|merging|merged) (\w+)/i );
+}
+if ($opt_M) {
+ push (@mergerx, qr/$opt_M/);
+}
+
+select(STDERR); $|=1; select(STDOUT);
+
+
+package SVNconn;
+# Basic SVN connection.
+# We're only interested in connecting and downloading, so ...
+
+use File::Spec;
+use File::Temp qw(tempfile);
+use POSIX qw(strftime dup2);
+
+sub new {
+ my($what,$repo) = @_;
+ $what=ref($what) if ref($what);
+
+ my $self = {};
+ $self->{'buffer'} = "";
+ bless($self,$what);
+
+ $repo =~ s#/+$##;
+ $self->{'fullrep'} = $repo;
+ $self->conn();
+
+ $self->{'lines'} = undef;
+
+ return $self;
+}
+
+sub conn {
+ my $self = shift;
+ my $repo = $self->{'fullrep'};
+ my $s = SVN::Ra->new($repo);
+
+ die "SVN connection to $repo: $!\n" unless defined $s;
+ $self->{'svn'} = $s;
+ $self->{'repo'} = $repo;
+ $self->{'maxrev'} = $s->get_latest_revnum();
+}
+
+sub file {
+ my($self,$path,$rev) = @_;
+ my $res;
+
+ my ($fh, $name) = tempfile('gitsvn.XXXXXX',
+ DIR => File::Spec->tmpdir(), UNLINK => 1);
+
+ $self->{'svn'}->get_file($path,$rev,$fh) or do {
+ # retry
+ $self->conn();
+ $self->{'svn'}->get_file($path,$rev,$fh)
+ or die "$rev: No file $path at $rev\n";
+ };
+ close ($fh);
+
+ return ($name, $res);
+}
+
+
+package main;
+
+my $svn = SVNconn->new($cvs_tree);
+
+
+sub pdate($) {
+ my($d) = @_;
+ $d =~ m#(\d\d\d\d)-(\d\d)-(\d\d)T(\d\d):(\d\d):(\d\d)#
+ or die "Unparseable date: $d\n";
+ my $y=$1; $y-=1900 if $y>1900;
+ return timegm($6||0,$5,$4,$3,$2-1,$y);
+}
+
+sub pmode($) {
+ my($mode) = @_;
+ my $m = 0;
+ my $mm = 0;
+ my $um = 0;
+ for my $x(split(//,$mode)) {
+ if($x eq ",") {
+ $m |= $mm&$um;
+ $mm = 0;
+ $um = 0;
+ } elsif($x eq "u") { $um |= 0700;
+ } elsif($x eq "g") { $um |= 0070;
+ } elsif($x eq "o") { $um |= 0007;
+ } elsif($x eq "r") { $mm |= 0444;
+ } elsif($x eq "w") { $mm |= 0222;
+ } elsif($x eq "x") { $mm |= 0111;
+ } elsif($x eq "=") { # do nothing
+ } else { die "Unknown mode: $mode\n";
+ }
+ }
+ $m |= $mm&$um;
+ return $m;
+}
+
+sub getwd() {
+ my $pwd = `pwd`;
+ chomp $pwd;
+ return $pwd;
+}
+
+
+sub get_headref($$) {
+ my $name = shift;
+ my $git_dir = shift;
+ my $sha;
+
+ if (open(C,"$git_dir/refs/heads/$name")) {
+ chomp($sha = <C>);
+ close(C);
+ length($sha) == 40
+ or die "Cannot get head id for $name ($sha): $!\n";
+ }
+ return $sha;
+}
+
+
+-d $git_tree
+ or mkdir($git_tree,0777)
+ or die "Could not create $git_tree: $!";
+chdir($git_tree);
+
+my $orig_branch = "";
+my $forward_master = 0;
+my %branches;
+
+my $git_dir = $ENV{"GIT_DIR"} || ".git";
+$git_dir = getwd()."/".$git_dir unless $git_dir =~ m#^/#;
+$ENV{"GIT_DIR"} = $git_dir;
+my $orig_git_index;
+$orig_git_index = $ENV{GIT_INDEX_FILE} if exists $ENV{GIT_INDEX_FILE};
+my ($git_ih, $git_index) = tempfile('gitXXXXXX', SUFFIX => '.idx',
+ DIR => File::Spec->tmpdir());
+close ($git_ih);
+$ENV{GIT_INDEX_FILE} = $git_index;
+my $maxnum = 0;
+my $last_rev = "";
+my $last_branch;
+my $current_rev = 0;
+unless(-d $git_dir) {
+ system("git-init-db");
+ die "Cannot init the GIT db at $git_tree: $?\n" if $?;
+ system("git-read-tree");
+ die "Cannot init an empty tree: $?\n" if $?;
+
+ $last_branch = $opt_o;
+ $orig_branch = "";
+} else {
+ -f "$git_dir/refs/heads/$opt_o"
+ or die "Branch '$opt_o' does not exist.\n".
+ "Either use the correct '-o branch' option,\n".
+ "or import to a new repository.\n";
+
+ -f "$git_dir/svn2git"
+ or die "'$git_dir/svn2git' does not exist.\n".
+ "You need that file for incremental imports.\n";
+ $last_branch = basename(readlink("$git_dir/HEAD"));
+ unless($last_branch) {
+ warn "Cannot read the last branch name: $! -- assuming 'master'\n";
+ $last_branch = "master";
+ }
+ $orig_branch = $last_branch;
+ $last_rev = get_headref($orig_branch, $git_dir);
+ if (-f "$git_dir/SVN2GIT_HEAD") {
+ die <<EOM;
+SVN2GIT_HEAD exists.
+Make sure your working directory corresponds to HEAD and remove SVN2GIT_HEAD.
+You may need to run
+
+ git-read-tree -m -u SVN2GIT_HEAD HEAD
+EOM
+ }
+ system('cp', "$git_dir/HEAD", "$git_dir/SVN2GIT_HEAD");
+
+ $forward_master =
+ $opt_o ne 'master' && -f "$git_dir/refs/heads/master" &&
+ system('cmp', '-s', "$git_dir/refs/heads/master",
+ "$git_dir/refs/heads/$opt_o") == 0;
+
+ # populate index
+ system('git-read-tree', $last_rev);
+ die "read-tree failed: $?\n" if $?;
+
+ # Get the last import timestamps
+ open my $B,"<", "$git_dir/svn2git";
+ while(<$B>) {
+ chomp;
+ my($num,$branch,$ref) = split;
+ $branches{$branch}{$num} = $ref;
+ $branches{$branch}{"LAST"} = $ref;
+ $current_rev = $num+1 if $current_rev < $num+1;
+ }
+ close($B);
+}
+-d $git_dir
+ or die "Could not create git subdir ($git_dir).\n";
+
+open BRANCHES,">>", "$git_dir/svn2git";
+
+
+## cvsps output:
+#---------------------
+#PatchSet 314
+#Date: 1999/09/18 13:03:59
+#Author: wkoch
+#Branch: STABLE-BRANCH-1-0
+#Ancestor branch: HEAD
+#Tag: (none)
+#Log:
+# See ChangeLog: Sat Sep 18 13:03:28 CEST 1999 Werner Koch
+#Members:
+# README:1.57->1.57.2.1
+# VERSION:1.96->1.96.2.1
+#
+#---------------------
+
+my $state = 0;
+
+sub get_file($$$) {
+ my($rev,$branch,$path) = @_;
+
+ # revert split_path(), below
+ my $svnpath;
+ $path = "" if $path eq "/"; # this should not happen, but ...
+ if($branch eq "/") {
+ $svnpath = "/$trunk_name/$path";
+ } elsif($branch =~ m#^/#) {
+ $svnpath = "/$tag_name$branch/$path";
+ } else {
+ $svnpath = "/$branch_name/$branch/$path";
+ }
+
+ # now get it
+ my ($name, $res) = $svn->file($svnpath,$rev);
+
+ open my $F, '-|', "git-hash-object -w $name"
+ or die "Cannot create object: $!\n";
+ my $sha = <$F>;
+ chomp $sha;
+ close $F;
+ # my $mode = pmode($cvs->{'mode'});
+ my $mode = "0644"; # SV does not seem to store any file modes
+ return [$mode, $sha, $path];
+}
+
+sub split_path($$) {
+ my($rev,$path) = @_;
+ my $branch;
+
+ if($path =~ s#^/\Q$tag_name\E/([^/]+)/?##) {
+ $branch = "/$1";
+ } elsif($path =~ s#^/\Q$trunk_name\E/?##) {
+ $branch = "/";
+ } elsif($path =~ s#^/\Q$branch_name\E/([^/]+)/?##) {
+ $branch = $1;
+ } else {
+ print STDERR "$rev: Unrecognized path: $path\n";
+ return ()
+ }
+ $path = "/" if $path eq "";
+ return ($branch,$path);
+}
+
+sub commit {
+ my($branch, $changed_paths, $revision, $author, $date, $message) = @_;
+ my($author_name,$author_email,$dest);
+ my(@old,@new);
+
+ if ($author =~ /^(.*?)\s+<(.*)>$/) {
+ ($author_name, $author_email) = ($1, $2);
+ } else {
+ $author =~ s/^<(.*)>$/$1/;
+ $author_name = $author_email = $author;
+ }
+ $date = pdate($date);
+
+ my $tag;
+ my $parent;
+ if($branch eq "/") { # trunk
+ $parent = $opt_o;
+ } elsif($branch =~ m#^/(.+)#) { # tag
+ $tag = 1;
+ $parent = $1;
+ } else { # "normal" branch
+ # nothing to do
+ $parent = $branch;
+ }
+ $dest = $parent;
+
+ my $prev = $changed_paths->{"/"};
+ if($prev and $prev->action eq "A") {
+ delete $changed_paths->{"/"};
+ my $oldpath = $prev->copyfrom_path;
+ my $rev;
+ if(defined $oldpath) {
+ my $p;
+ ($parent,$p) = split_path($revision,$oldpath);
+ if($parent eq "/") {
+ $parent = $opt_o;
+ } else {
+ $parent =~ s#^/##; # if it's a tag
+ }
+ } else {
+ $parent = undef;
+ }
+ }
+
+ my $rev;
+ if(defined $parent) {
+ open(H,"git-rev-parse --verify $parent |");
+ $rev = <H>;
+ close(H) or do {
+ print STDERR "$revision: cannot find commit '$parent'!\n";
+ return;
+ };
+ chop $rev;
+ if(length($rev) != 40) {
+ print STDERR "$revision: cannot find commit '$parent'!\n";
+ return;
+ }
+ $rev = $branches{($parent eq $opt_o) ? "/" : $parent}{"LAST"};
+ if($revision != 1 and not $rev) {
+ print STDERR "$revision: do not know ancestor for '$parent'!\n";
+ return;
+ }
+ } else {
+ $rev = undef;
+ }
+
+# if($prev and $prev->action eq "A") {
+# if(not $tag) {
+# unless(open(H,"> $git_dir/refs/heads/$branch")) {
+# print STDERR "$revision: Could not create branch $branch: $!\n";
+# $state=11;
+# next;
+# }
+# print H "$rev\n"
+# or die "Could not write branch $branch: $!";
+# close(H)
+# or die "Could not write branch $branch: $!";
+# }
+# }
+ if(not defined $rev) {
+ unlink($git_index);
+ } elsif ($rev ne $last_rev) {
+ print "Switching from $last_rev to $rev ($branch)\n" if $opt_v;
+ system("git-read-tree", $rev);
+ die "read-tree failed for $rev: $?\n" if $?;
+ $last_rev = $rev;
+ }
+
+ while(my($path,$action) = each %$changed_paths) {
+ if ($action->action eq "A") {
+ my $f = get_file($revision,$branch,$path);
+ push(@new,$f) if $f;
+ } elsif ($action->action eq "D") {
+ push(@old,$path);
+ } elsif ($action->action eq "M") {
+ my $f = get_file($revision,$branch,$path);
+ push(@new,$f) if $f;
+ } elsif ($action->action eq "R") {
+ # refer to a file/tree in an earlier commit
+ push(@old,$path); # remove any old stuff
+
+ # ... and add any new stuff
+ my($b,$p) = split_path($revision,$action->oldpath);
+ open my $F,"-|","git-ls-tree","-r","-z", $branches{$b}{$action->oldrev}, $p;
+ local $/ = '\0';
+ while(<$F>) {
+ chomp;
+ my($m,$p) = split(/\t/,$_,2);
+ my($mode,$type,$sha1) = split(/ /,$m);
+ next if $type ne "blob";
+ push(@new,[$mode,$sha1,$p]);
+ }
+ } else {
+ die "$revision: unknown action '".$action->action."' for $path\n";
+ }
+ }
+
+ if(@old) {
+ open F, "-│", "git-ls-files", "-z", @old or die $!;
+ @old = ();
+ local $/ = '\0';
+ while(<F>) {
+ chomp;
+ push(@old,$_);
+ }
+ close(F);
+
+ while(@old) {
+ my @o2;
+ if(@old > 55) {
+ @o2 = splice(@old,0,50);
+ } else {
+ @o2 = @old;
+ @old = ();
+ }
+ system("git-update-index","--force-remove","--",@o2);
+ die "Cannot remove files: $?\n" if $?;
+ }
+ }
+ while(@new) {
+ my @n2;
+ if(@new > 12) {
+ @n2 = splice(@new,0,10);
+ } else {
+ @n2 = @new;
+ @new = ();
+ }
+ system("git-update-index","--add",
+ (map { ('--cacheinfo', @$_) } @n2));
+ die "Cannot add files: $?\n" if $?;
+ }
+
+ my $pid = open(C,"-|");
+ die "Cannot fork: $!" unless defined $pid;
+ unless($pid) {
+ exec("git-write-tree");
+ die "Cannot exec git-write-tree: $!\n";
+ }
+ chomp(my $tree = <C>);
+ length($tree) == 40
+ or die "Cannot get tree id ($tree): $!\n";
+ close(C)
+ or die "Error running git-write-tree: $?\n";
+ print "Tree ID $tree\n" if $opt_v;
+
+ my $pr = IO::Pipe->new() or die "Cannot open pipe: $!\n";
+ my $pw = IO::Pipe->new() or die "Cannot open pipe: $!\n";
+ $pid = fork();
+ die "Fork: $!\n" unless defined $pid;
+ unless($pid) {
+ $pr->writer();
+ $pw->reader();
+ open(OUT,">&STDOUT");
+ dup2($pw->fileno(),0);
+ dup2($pr->fileno(),1);
+ $pr->close();
+ $pw->close();
+
+ my @par = ();
+ @par = ("-p",$rev) if defined $rev;
+
+ # loose detection of merges
+ # based on the commit msg
+ foreach my $rx (@mergerx) {
+ if ($message =~ $rx) {
+ my $mparent = $1;
+ if ($mparent eq 'HEAD') { $mparent = $opt_o };
+ if ( -e "$git_dir/refs/heads/$mparent") {
+ $mparent = get_headref($mparent, $git_dir);
+ push @par, '-p', $mparent;
+ print OUT "Merge parent branch: $mparent\n" if $opt_v;
+ }
+ }
+ }
+
+ exec("env",
+ "GIT_AUTHOR_NAME=$author_name",
+ "GIT_AUTHOR_EMAIL=$author_email",
+ "GIT_AUTHOR_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
+ "GIT_COMMITTER_NAME=$author_name",
+ "GIT_COMMITTER_EMAIL=$author_email",
+ "GIT_COMMITTER_DATE=".strftime("+0000 %Y-%m-%d %H:%M:%S",gmtime($date)),
+ "git-commit-tree", $tree,@par);
+ die "Cannot exec git-commit-tree: $!\n";
+ }
+ $pw->writer();
+ $pr->reader();
+
+ $message =~ s/[\s\n]+\z//;
+
+ print $pw "$message\n"
+ or die "Error writing to git-commit-tree: $!\n";
+ $pw->close();
+
+ print "Committed change $revision:$branch ".strftime("%Y-%m-%d %H:%M:%S",gmtime($date)).")\n" if $opt_v;
+ chomp(my $cid = <$pr>);
+ length($cid) == 40
+ or die "Cannot get commit id ($cid): $!\n";
+ print "Commit ID $cid\n" if $opt_v;
+ $pr->close();
+
+ waitpid($pid,0);
+ die "Error running git-commit-tree: $?\n" if $?;
+
+ if(defined $dest) {
+ print "Writing to refs/heads/$dest\n" if $opt_v;
+ open(C,">$git_dir/refs/heads/$dest") and
+ print C ("$cid\n") and
+ close(C)
+ or die "Cannot write branch $dest for update: $!\n";
+ } else {
+ print "... no known parent\n" if $opt_v;
+ }
+ $branches{$branch}{"LAST"} = $cid;
+ $branches{$branch}{$revision} = $cid;
+ $last_rev = $cid;
+ print BRANCHES "$revision $branch $cid\n";
+ print "DONE: $revision $dest $cid\n" if $opt_v;
+
+ if($tag) {
+ my($in, $out) = ('','');
+ $last_rev = "-" if %$changed_paths;
+ # the tag was 'complex', i.e. did not refer to a "real" revision
+
+ $tag =~ tr/_/\./ if $opt_u;
+
+ my $pid = open2($in, $out, 'git-mktag');
+ print $out ("object $cid\n".
+ "type commit\n".
+ "tag $tag\n".
+ "tagger $author_name <$author_email>\n") and
+ close($out)
+ or die "Cannot create tag object $tag: $!\n";
+
+ my $tagobj = <$in>;
+ chomp $tagobj;
+
+ if ( !close($in) or waitpid($pid, 0) != $pid or
+ $? != 0 or $tagobj !~ /^[0123456789abcdef]{40}$/ ) {
+ die "Cannot create tag object $tag: $!\n";
+ }
+
+
+ open(C,">$git_dir/refs/tags/$tag")
+ or die "Cannot create tag $tag: $!\n";
+ print C "$tagobj\n"
+ or die "Cannot write tag $tag: $!\n";
+ close(C)
+ or die "Cannot write tag $tag: $!\n";
+
+ print "Created tag '$tag' on '$branch'\n" if $opt_v;
+ }
+}
+
+my ($changed_paths, $revision, $author, $date, $message, $pool) = @_;
+sub _commit_all {
+ ($changed_paths, $revision, $author, $date, $message, $pool) = @_;
+}
+sub commit_all {
+ my %done;
+ my @col;
+ my $pref;
+ my $branch;
+
+ while(my($path,$action) = each %$changed_paths) {
+ ($branch,$path) = split_path($revision,$path);
+ next if not defined $branch;
+ $done{$branch}{$path} = $action;
+ }
+ while(($branch,$changed_paths) = each %done) {
+ commit($branch, $changed_paths, $revision, $author, $date, $message);
+ }
+}
+
+while(++$current_rev < $svn->{'maxrev'}) {
+ $svn->{'svn'}->get_log("/",$current_rev,$current_rev,$current_rev,1,1,\&_commit_all,"");
+ commit_all();
+}
+
+
+unlink($git_index);
+
+if (defined $orig_git_index) {
+ $ENV{GIT_INDEX_FILE} = $orig_git_index;
+} else {
+ delete $ENV{GIT_INDEX_FILE};
+}
+
+# Now switch back to the branch we were in before all of this happened
+if($orig_branch) {
+ print "DONE\n" if $opt_v;
+ system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
+ if $forward_master;
+ unless ($opt_i) {
+ system('git-read-tree', '-m', '-u', 'SVN2GIT_HEAD', 'HEAD');
+ die "read-tree failed: $?\n" if $?;
+ }
+} else {
+ $orig_branch = "master";
+ print "DONE; creating $orig_branch branch\n" if $opt_v;
+ system("cp","$git_dir/refs/heads/$opt_o","$git_dir/refs/heads/master")
+ unless -f "$git_dir/refs/heads/master";
+ unlink("$git_dir/HEAD");
+ symlink("refs/heads/$orig_branch","$git_dir/HEAD");
+ unless ($opt_i) {
+ system('git checkout');
+ die "checkout failed: $?\n" if $?;
+ }
+}
+unlink("$git_dir/SVN2GIT_HEAD");
+close(BRANCHES);