265 lines
8 KiB
Perl
265 lines
8 KiB
Perl
package Git::SVN::Migration;
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# these version numbers do NOT correspond to actual version numbers
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# of git or git-svn. They are just relative.
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#
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# v0 layout: .git/$id/info/url, refs/heads/$id-HEAD
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#
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# v1 layout: .git/$id/info/url, refs/remotes/$id
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#
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# v2 layout: .git/svn/$id/info/url, refs/remotes/$id
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#
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# v3 layout: .git/svn/$id, refs/remotes/$id
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# - info/url may remain for backwards compatibility
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# - this is what we migrate up to this layout automatically,
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# - this will be used by git svn init on single branches
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# v3.1 layout (auto migrated):
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# - .rev_db => .rev_db.$UUID, .rev_db will remain as a symlink
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# for backwards compatibility
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#
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# v4 layout: .git/svn/$repo_id/$id, refs/remotes/$repo_id/$id
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# - this is only created for newly multi-init-ed
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# repositories. Similar in spirit to the
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# --use-separate-remotes option in git-clone (now default)
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# - we do not automatically migrate to this (following
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# the example set by core git)
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#
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# v5 layout: .rev_db.$UUID => .rev_map.$UUID
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# - newer, more-efficient format that uses 24-bytes per record
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# with no filler space.
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# - use xxd -c24 < .rev_map.$UUID to view and debug
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# - This is a one-way migration, repositories updated to the
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# new format will not be able to use old git-svn without
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# rebuilding the .rev_db. Rebuilding the rev_db is not
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# possible if noMetadata or useSvmProps are set; but should
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# be no problem for users that use the (sensible) defaults.
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use strict;
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use warnings;
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use Carp qw/croak/;
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use File::Path qw/mkpath/;
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use File::Basename qw/dirname basename/;
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our $_minimize;
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use Git qw(
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command
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command_noisy
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command_output_pipe
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command_close_pipe
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command_oneline
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);
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use Git::SVN;
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sub migrate_from_v0 {
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my $git_dir = $ENV{GIT_DIR};
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return undef unless -d $git_dir;
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my ($fh, $ctx) = command_output_pipe(qw/rev-parse --symbolic --all/);
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my $migrated = 0;
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while (<$fh>) {
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chomp;
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my ($id, $orig_ref) = ($_, $_);
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next unless $id =~ s#^refs/heads/(.+)-HEAD$#$1#;
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my $info_url = command_oneline(qw(rev-parse --git-path),
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"$id/info/url");
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next unless -f $info_url;
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my $new_ref = "refs/remotes/$id";
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if (::verify_ref("$new_ref^0")) {
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print STDERR "W: $orig_ref is probably an old ",
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"branch used by an ancient version of ",
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"git-svn.\n",
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"However, $new_ref also exists.\n",
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"We will not be able ",
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"to use this branch until this ",
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"ambiguity is resolved.\n";
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next;
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}
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print STDERR "Migrating from v0 layout...\n" if !$migrated;
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print STDERR "Renaming ref: $orig_ref => $new_ref\n";
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command_noisy('update-ref', $new_ref, $orig_ref);
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command_noisy('update-ref', '-d', $orig_ref, $orig_ref);
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$migrated++;
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}
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command_close_pipe($fh, $ctx);
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print STDERR "Done migrating from v0 layout...\n" if $migrated;
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$migrated;
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}
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sub migrate_from_v1 {
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my $git_dir = $ENV{GIT_DIR};
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my $migrated = 0;
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return $migrated unless -d $git_dir;
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my $svn_dir = Git::SVN::svn_dir();
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# just in case somebody used 'svn' as their $id at some point...
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return $migrated if -d $svn_dir && ! -f "$svn_dir/info/url";
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print STDERR "Migrating from a git-svn v1 layout...\n";
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mkpath([$svn_dir]);
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print STDERR "Data from a previous version of git-svn exists, but\n\t",
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"$svn_dir\n\t(required for this version ",
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"($::VERSION) of git-svn) does not exist.\n";
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my ($fh, $ctx) = command_output_pipe(qw/rev-parse --symbolic --all/);
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while (<$fh>) {
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my $x = $_;
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next unless $x =~ s#^refs/remotes/##;
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chomp $x;
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my $info_url = command_oneline(qw(rev-parse --git-path),
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"$x/info/url");
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next unless -f $info_url;
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my $u = eval { ::file_to_s($info_url) };
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next unless $u;
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my $dn = dirname("$svn_dir/$x");
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mkpath([$dn]) unless -d $dn;
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if ($x eq 'svn') { # they used 'svn' as GIT_SVN_ID:
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mkpath(["$svn_dir/svn"]);
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print STDERR " - $git_dir/$x/info => ",
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"$svn_dir/$x/info\n";
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rename "$git_dir/$x/info", "$svn_dir/$x/info" or
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croak "$!: $x";
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# don't worry too much about these, they probably
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# don't exist with repos this old (save for index,
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# and we can easily regenerate that)
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foreach my $f (qw/unhandled.log index .rev_db/) {
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rename "$git_dir/$x/$f", "$svn_dir/$x/$f";
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}
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} else {
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print STDERR " - $git_dir/$x => $svn_dir/$x\n";
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rename "$git_dir/$x", "$svn_dir/$x" or croak "$!: $x";
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}
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$migrated++;
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}
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command_close_pipe($fh, $ctx);
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print STDERR "Done migrating from a git-svn v1 layout\n";
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$migrated;
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}
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sub read_old_urls {
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my ($l_map, $pfx, $path) = @_;
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my @dir;
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foreach (<$path/*>) {
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if (-r "$_/info/url") {
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$pfx .= '/' if $pfx && $pfx !~ m!/$!;
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my $ref_id = $pfx . basename $_;
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my $url = ::file_to_s("$_/info/url");
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$l_map->{$ref_id} = $url;
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} elsif (-d $_) {
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push @dir, $_;
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}
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}
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my $svn_dir = Git::SVN::svn_dir();
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foreach (@dir) {
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my $x = $_;
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$x =~ s!^\Q$svn_dir\E/!!o;
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read_old_urls($l_map, $x, $_);
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}
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}
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sub migrate_from_v2 {
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my @cfg = command(qw/config -l/);
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return if grep /^svn-remote\..+\.url=/, @cfg;
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my %l_map;
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read_old_urls(\%l_map, '', Git::SVN::svn_dir());
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my $migrated = 0;
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require Git::SVN;
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foreach my $ref_id (sort keys %l_map) {
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eval { Git::SVN->init($l_map{$ref_id}, '', undef, $ref_id) };
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if ($@) {
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Git::SVN->init($l_map{$ref_id}, '', $ref_id, $ref_id);
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}
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$migrated++;
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}
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$migrated;
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}
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sub minimize_connections {
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require Git::SVN;
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require Git::SVN::Ra;
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my $r = Git::SVN::read_all_remotes();
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my $new_urls = {};
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my $root_repos = {};
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foreach my $repo_id (keys %$r) {
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my $url = $r->{$repo_id}->{url} or next;
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my $fetch = $r->{$repo_id}->{fetch} or next;
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my $ra = Git::SVN::Ra->new($url);
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# skip existing cases where we already connect to the root
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if (($ra->url eq $ra->{repos_root}) ||
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($ra->{repos_root} eq $repo_id)) {
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$root_repos->{$ra->url} = $repo_id;
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next;
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}
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my $root_ra = Git::SVN::Ra->new($ra->{repos_root});
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my $root_path = $ra->url;
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$root_path =~ s#^\Q$ra->{repos_root}\E(/|$)##;
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foreach my $path (keys %$fetch) {
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my $ref_id = $fetch->{$path};
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my $gs = Git::SVN->new($ref_id, $repo_id, $path);
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# make sure we can read when connecting to
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# a higher level of a repository
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my ($last_rev, undef) = $gs->last_rev_commit;
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if (!defined $last_rev) {
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$last_rev = eval {
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$root_ra->get_latest_revnum;
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};
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next if $@;
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}
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my $new = $root_path;
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$new .= length $path ? "/$path" : '';
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eval {
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$root_ra->get_log([$new], $last_rev, $last_rev,
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0, 0, 1, sub { });
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};
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next if $@;
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$new_urls->{$ra->{repos_root}}->{$new} =
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{ ref_id => $ref_id,
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old_repo_id => $repo_id,
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old_path => $path };
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}
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}
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my @emptied;
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foreach my $url (keys %$new_urls) {
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# see if we can re-use an existing [svn-remote "repo_id"]
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# instead of creating a(n ugly) new section:
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my $repo_id = $root_repos->{$url} || $url;
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my $fetch = $new_urls->{$url};
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foreach my $path (keys %$fetch) {
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my $x = $fetch->{$path};
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Git::SVN->init($url, $path, $repo_id, $x->{ref_id});
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my $pfx = "svn-remote.$x->{old_repo_id}";
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my $old_fetch = quotemeta("$x->{old_path}:".
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"$x->{ref_id}");
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command_noisy(qw/config --unset/,
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"$pfx.fetch", '^'. $old_fetch . '$');
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delete $r->{$x->{old_repo_id}}->
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{fetch}->{$x->{old_path}};
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if (!keys %{$r->{$x->{old_repo_id}}->{fetch}}) {
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command_noisy(qw/config --unset/,
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"$pfx.url");
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push @emptied, $x->{old_repo_id}
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}
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}
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}
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if (@emptied) {
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my $file = $ENV{GIT_CONFIG} ||
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command_oneline(qw(rev-parse --git-path config));
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print STDERR <<EOF;
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The following [svn-remote] sections in your config file ($file) are empty
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and can be safely removed:
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EOF
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print STDERR "[svn-remote \"$_\"]\n" foreach @emptied;
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}
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}
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sub migration_check {
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migrate_from_v0();
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migrate_from_v1();
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migrate_from_v2();
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minimize_connections() if $_minimize;
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}
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1;
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