1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
|
package Git::SVN::Migration;
# these version numbers do NOT correspond to actual version numbers
# of git nor git-svn. They are just relative.
#
# v0 layout: .git/$id/info/url, refs/heads/$id-HEAD
#
# v1 layout: .git/$id/info/url, refs/remotes/$id
#
# v2 layout: .git/svn/$id/info/url, refs/remotes/$id
#
# v3 layout: .git/svn/$id, refs/remotes/$id
# - info/url may remain for backwards compatibility
# - this is what we migrate up to this layout automatically,
# - this will be used by git svn init on single branches
# v3.1 layout (auto migrated):
# - .rev_db => .rev_db.$UUID, .rev_db will remain as a symlink
# for backwards compatibility
#
# v4 layout: .git/svn/$repo_id/$id, refs/remotes/$repo_id/$id
# - this is only created for newly multi-init-ed
# repositories. Similar in spirit to the
# --use-separate-remotes option in git-clone (now default)
# - we do not automatically migrate to this (following
# the example set by core git)
#
# v5 layout: .rev_db.$UUID => .rev_map.$UUID
# - newer, more-efficient format that uses 24-bytes per record
# with no filler space.
# - use xxd -c24 < .rev_map.$UUID to view and debug
# - This is a one-way migration, repositories updated to the
# new format will not be able to use old git-svn without
# rebuilding the .rev_db. Rebuilding the rev_db is not
# possible if noMetadata or useSvmProps are set; but should
# be no problem for users that use the (sensible) defaults.
use strict;
use warnings;
use Carp qw/croak/;
use File::Path qw/mkpath/;
use File::Basename qw/dirname basename/;
our $_minimize;
use Git qw(
command
command_noisy
command_output_pipe
command_close_pipe
);
sub migrate_from_v0 {
my $git_dir = $ENV{GIT_DIR};
return undef unless -d $git_dir;
my ($fh, $ctx) = command_output_pipe(qw/rev-parse --symbolic --all/);
my $migrated = 0;
while (<$fh>) {
chomp;
my ($id, $orig_ref) = ($_, $_);
next unless $id =~ s#^refs/heads/(.+)-HEAD$#$1#;
next unless -f "$git_dir/$id/info/url";
my $new_ref = "refs/remotes/$id";
if (::verify_ref("$new_ref^0")) {
print STDERR "W: $orig_ref is probably an old ",
"branch used by an ancient version of ",
"git-svn.\n",
"However, $new_ref also exists.\n",
"We will not be able ",
"to use this branch until this ",
"ambiguity is resolved.\n";
next;
}
print STDERR "Migrating from v0 layout...\n" if !$migrated;
print STDERR "Renaming ref: $orig_ref => $new_ref\n";
command_noisy('update-ref', $new_ref, $orig_ref);
command_noisy('update-ref', '-d', $orig_ref, $orig_ref);
$migrated++;
}
command_close_pipe($fh, $ctx);
print STDERR "Done migrating from v0 layout...\n" if $migrated;
$migrated;
}
sub migrate_from_v1 {
my $git_dir = $ENV{GIT_DIR};
my $migrated = 0;
return $migrated unless -d $git_dir;
my $svn_dir = "$git_dir/svn";
# just in case somebody used 'svn' as their $id at some point...
return $migrated if -d $svn_dir && ! -f "$svn_dir/info/url";
print STDERR "Migrating from a git-svn v1 layout...\n";
mkpath([$svn_dir]);
print STDERR "Data from a previous version of git-svn exists, but\n\t",
"$svn_dir\n\t(required for this version ",
"($::VERSION) of git-svn) does not exist.\n";
my ($fh, $ctx) = command_output_pipe(qw/rev-parse --symbolic --all/);
while (<$fh>) {
my $x = $_;
next unless $x =~ s#^refs/remotes/##;
chomp $x;
next unless -f "$git_dir/$x/info/url";
my $u = eval { ::file_to_s("$git_dir/$x/info/url") };
next unless $u;
my $dn = dirname("$git_dir/svn/$x");
mkpath([$dn]) unless -d $dn;
if ($x eq 'svn') { # they used 'svn' as GIT_SVN_ID:
mkpath(["$git_dir/svn/svn"]);
print STDERR " - $git_dir/$x/info => ",
"$git_dir/svn/$x/info\n";
rename "$git_dir/$x/info", "$git_dir/svn/$x/info" or
croak "$!: $x";
# don't worry too much about these, they probably
# don't exist with repos this old (save for index,
# and we can easily regenerate that)
foreach my $f (qw/unhandled.log index .rev_db/) {
rename "$git_dir/$x/$f", "$git_dir/svn/$x/$f";
}
} else {
print STDERR " - $git_dir/$x => $git_dir/svn/$x\n";
rename "$git_dir/$x", "$git_dir/svn/$x" or
croak "$!: $x";
}
$migrated++;
}
command_close_pipe($fh, $ctx);
print STDERR "Done migrating from a git-svn v1 layout\n";
$migrated;
}
sub read_old_urls {
my ($l_map, $pfx, $path) = @_;
my @dir;
foreach (<$path/*>) {
if (-r "$_/info/url") {
$pfx .= '/' if $pfx && $pfx !~ m!/$!;
my $ref_id = $pfx . basename $_;
my $url = ::file_to_s("$_/info/url");
$l_map->{$ref_id} = $url;
} elsif (-d $_) {
push @dir, $_;
}
}
foreach (@dir) {
my $x = $_;
$x =~ s!^\Q$ENV{GIT_DIR}\E/svn/!!o;
read_old_urls($l_map, $x, $_);
}
}
sub migrate_from_v2 {
my @cfg = command(qw/config -l/);
return if grep /^svn-remote\..+\.url=/, @cfg;
my %l_map;
read_old_urls(\%l_map, '', "$ENV{GIT_DIR}/svn");
my $migrated = 0;
require Git::SVN;
foreach my $ref_id (sort keys %l_map) {
eval { Git::SVN->init($l_map{$ref_id}, '', undef, $ref_id) };
if ($@) {
Git::SVN->init($l_map{$ref_id}, '', $ref_id, $ref_id);
}
$migrated++;
}
$migrated;
}
sub minimize_connections {
require Git::SVN;
require Git::SVN::Ra;
my $r = Git::SVN::read_all_remotes();
my $new_urls = {};
my $root_repos = {};
foreach my $repo_id (keys %$r) {
my $url = $r->{$repo_id}->{url} or next;
my $fetch = $r->{$repo_id}->{fetch} or next;
my $ra = Git::SVN::Ra->new($url);
# skip existing cases where we already connect to the root
if (($ra->url eq $ra->{repos_root}) ||
($ra->{repos_root} eq $repo_id)) {
$root_repos->{$ra->url} = $repo_id;
next;
}
my $root_ra = Git::SVN::Ra->new($ra->{repos_root});
my $root_path = $ra->url;
$root_path =~ s#^\Q$ra->{repos_root}\E(/|$)##;
foreach my $path (keys %$fetch) {
my $ref_id = $fetch->{$path};
my $gs = Git::SVN->new($ref_id, $repo_id, $path);
# make sure we can read when connecting to
# a higher level of a repository
my ($last_rev, undef) = $gs->last_rev_commit;
if (!defined $last_rev) {
$last_rev = eval {
$root_ra->get_latest_revnum;
};
next if $@;
}
my $new = $root_path;
$new .= length $path ? "/$path" : '';
eval {
$root_ra->get_log([$new], $last_rev, $last_rev,
0, 0, 1, sub { });
};
next if $@;
$new_urls->{$ra->{repos_root}}->{$new} =
{ ref_id => $ref_id,
old_repo_id => $repo_id,
old_path => $path };
}
}
my @emptied;
foreach my $url (keys %$new_urls) {
# see if we can re-use an existing [svn-remote "repo_id"]
# instead of creating a(n ugly) new section:
my $repo_id = $root_repos->{$url} || $url;
my $fetch = $new_urls->{$url};
foreach my $path (keys %$fetch) {
my $x = $fetch->{$path};
Git::SVN->init($url, $path, $repo_id, $x->{ref_id});
my $pfx = "svn-remote.$x->{old_repo_id}";
my $old_fetch = quotemeta("$x->{old_path}:".
"$x->{ref_id}");
command_noisy(qw/config --unset/,
"$pfx.fetch", '^'. $old_fetch . '$');
delete $r->{$x->{old_repo_id}}->
{fetch}->{$x->{old_path}};
if (!keys %{$r->{$x->{old_repo_id}}->{fetch}}) {
command_noisy(qw/config --unset/,
"$pfx.url");
push @emptied, $x->{old_repo_id}
}
}
}
if (@emptied) {
my $file = $ENV{GIT_CONFIG} || "$ENV{GIT_DIR}/config";
print STDERR <<EOF;
The following [svn-remote] sections in your config file ($file) are empty
and can be safely removed:
EOF
print STDERR "[svn-remote \"$_\"]\n" foreach @emptied;
}
}
sub migration_check {
migrate_from_v0();
migrate_from_v1();
migrate_from_v2();
minimize_connections() if $_minimize;
}
1;
|
