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}

sub recover_headrev {
    my ($self, $target, $m) = @_;

    my $fs = $target->repos->fs;
    my ($props, $headrev, $rev, $firstrev, $skipped, $uuid, $rrev);

    traverse_history (
        root        => $fs->revision_root ($fs->youngest_rev),
        path        => $m->{target_path},
        cross       => 1,
        callback    => sub {
            $rev = $_[1];
            $firstrev ||= $rev;
            $logger->info(loc("Analyzing revision %1...\n", $rev),
                  ('-' x 70),"\n",
                  $fs->revision_prop ($rev, 'svn:log'));

            if ( $headrev = $fs->revision_prop ($rev, 'svm:headrev') ) {
                ($uuid, $rrev) = split(/[:\n]/, $headrev);
                $props = $fs->revision_proplist($rev);
                get_prompt(loc(
                    "Found merge ticket at revision %1 (remote %2); use it? (y/n) ",
                    $rev, $rrev
                ), qr/^[YyNn]/) =~ /^[Nn]/ or return 0; # last
                undef $headrev;
            }
            $skipped++;
            return 1;
        },
    );

    if (!$headrev) {
        die loc("No mirror history found; cannot recover.\n");
    }

    if (!$skipped) {
        $logger->warn(loc("No need to revert; it is already the head revision."));
        return;
    }

    get_prompt(
        loc("Revert to revision %1 and discard %*(%2,revision)? (y/n) ", $rev, $skipped),
        qr/^[YyNn]/,
    ) =~ /^[Yy]/ or die loc("Aborted.\n");

    $self->command(
        delete => { direct => 1, message => '' }
    )->run($target);

    $target->refresh_revision;
    $self->command(
        copy => { direct  => 1, message => '' },
    )->run($target->new(revision => $rev) => $target->new);

    # XXX - race condition? should get the last committed rev instead
    $target->refresh_revision;

    $self->command(
        propset => { direct  => 1, revprop => 1 },
    )->run($_ => $props->{$_}, $target) for sort grep {m/^sv[nm]/} keys %$props;

    $logger->info( loc("Mirror state successfully recovered."));
    return;
}

sub recover_list_entry {
    my ($self, $target, $m) = @_;

    my %mirrors = map { ($_ => 1) } SVN::Mirror::list_mirror ($target->repos);

    return if $mirrors{$m->{target_path}}++;

    $self->command ( propset => { direct => 1, message => 'foo' } )->run (
        'svm:mirror' => join ("\n", (grep length, sort keys %mirrors), ''),
        $self->arg_depotpath ('/'.$target->depotname.'/'),
    );

    $logger->info( loc("%1 added back to the list of mirrored paths.\n", $target->report));
    return;
}

1;

__DATA__

=head1 NAME

SVK::Command::Mirror - Initialize a mirrored depotpath

=head1 SYNOPSIS

 mirror [http|svn]://host/path DEPOTPATH

 # You may also list the target part first:
 mirror DEPOTPATH [http|svn]://host/path

 mirror --bootstrap=DUMPFILE DEPOTPATH [http|svn]://host/path 
 mirror --list [DEPOTNAME...]
 mirror --relocate DEPOTPATH [http|svn]://host/path 
 mirror --detach DEPOTPATH
 mirror --recover DEPOTPATH

 mirror --upgrade //
 mirror --upgrade /DEPOTNAME/

=head1 OPTIONS

 -b [--bootstrap]       : mirror from a dump file
 -l [--list]            : list mirrored paths
 -d [--detach]          : mark a depotpath as no longer mirrored
 --relocate             : change the upstream URI for the mirrored depotpath
 --recover              : recover the state of a mirror path
 --unlock               : forcibly remove stalled locks on a mirror
 --upgrade              : upgrade mirror state to the latest version