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package Gitolite::Triggers::Alias;
use Gitolite::Rc;
use Gitolite::Common;
use Gitolite::Conf::Load;
use strict;
use warnings;
# aliasing a repo to another
# ----------------------------------------------------------------------
=for usage
Why:
We had an existing repo "foo" that lots of people use. We wanted to
rename it to "foo/code", so that related repos "foo/upstream" and
"foo/docs" (both containing stuff we did not want to put in "foo") could
also be made and then the whole thing would be structured nicely.
At the same time we did not want to *force* all the users to change the
name. At least git operations should still work with the old name,
although it is OK for "info" and other "commands" to display/require the
proper name (i.e., the new name).
How:
* uncomment the line "Alias" in the "user-visible behaviour" section in the
rc file
* add a new variable REPO_ALIASES to the rc file, with entries like:
REPO_ALIASES =>
{
# if you need a more aggressive warning message than the default
WARNING => "Please change your URLs to use '%new'; '%old' will not work after XXXX-XX-XX",
# prefix mapping section
PREFIX_MAPS => {
# note: NO leading slash in keys or values below
'var/lib/git/' => '',
'var/opt/git/' => 'opt/',
},
# individual repo mapping section
'foo' => 'foo/code',
# force users to change their URLs
'bar' => '301/bar/code',
# a target repo starting with "301/" won't actually work;
# it will just produce an error message pointing the user
# to the new name. This allows admins to force users to
# fix their URLs.
},
If a prefix map is supplied, each key is checked (in *undefined* order),
and the *first* key which matches the prefix of the repo will be applied.
If more than one key matches (for example if you specify '/abc/def' as one
key, and '/abc' as another), it is undefined which will get picked up.
The result of this, (or the original repo name if no map was found), will
then be subject to the individual repo mappings. Since these are full
repo names, there is no possibility of multiple matches.
Notes:
* only git operations (clone/fetch/push) are alias aware. Nothing else in
gitolite, such as all the gitolite commands etc., are alias-aware and will
always use/require the proper repo name.
* http mode has not been tested and will not be. If someone has the time to
test it and make it work please let me know.
* funnily enough, this even works with mirroring! That is, a master can
push a repo "foo" to a slave per its configuration, while the slave thinks
it is getting repo "bar" from the master per its configuration.
Just make sure to put the Alias::input line *before* the Mirroring::input
line in the rc file on the slave.
However, it will probably not work with redirected pushes unless you setup
the opposite alias ("bar" -> "foo") on master.
=cut
sub input {
my $git_commands = "git-upload-pack|git-receive-pack|git-upload-archive";
my $user = $ARGV[0] || '@all'; # user name is undocumented for now
if ( $ENV{SSH_ORIGINAL_COMMAND} =~ /(?:$git_commands) '\/?(\S+)'$/ ) {
my $repo = $1;
( my $norm = $repo ) =~ s/\.git$//; # normalised repo name
my $target = $norm;
# prefix maps first
my $pm = $rc{REPO_ALIASES}{PREFIX_MAPS} || {};
while (my($k, $v) = each %$pm) {
last if $target =~ s/^$k/$v/;
# no /i, /g, etc. by design
}
# individual repo map next
$target = $rc{REPO_ALIASES}{$target} || $target;
# undocumented; don't use without discussing on mailing list
$target = $target->{$user} if ref($target) eq 'HASH';
# if the repo name finally maps to empty, we bail, with no changes
return unless $target;
# we're done. Did we actually change anything?
return if $norm eq $target;
# if the new name starts with "301/", inform and abort
_die "please use '$target' instead of '$norm'" if $target =~ s(^301/)();
# otherwise print a warning and continue with the new name
my $wm = $rc{REPO_ALIASES}{WARNING} || "'%old' is an alias for '%new'";
$wm =~ s/%new/$target/g;
$wm =~ s/%old/$norm/g;
_warn $wm;
$ENV{SSH_ORIGINAL_COMMAND} =~ s/'\/?$repo'/'$target'/;
}
}
1;
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