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git/git-remote.perl
Junio C Hamano b6f5da1e0f Teach git-remote add to fetch and track
This adds three options to 'git-remote add'.

 * -f (or --fetch) option tells it to also run the initial "git
    fetch" using the newly created remote shorthand.

 * -t (or --track) option tells it not to use the default
    wildcard to track all branches.

 * -m (or --master) option tells it to make the
    remote/$name/HEAD point at a remote tracking branch other
    than master.

For example, with this I can say:

  $ git remote add -f -t master -t quick-start -m master \
    jbf-um git://linux-nfs.org/~bfields/git.git/

to

 (1) create remote.jbf-um.url;

 (2) track master and quick-start branches (and no other); the
     two -t options create these two lines:

       fetch = +refs/heads/master:refs/remotes/jbf-um/master
       fetch = +refs/heads/quick-start:refs/remotes/jbf-um/quick-start

 (3) set up remotes/jbf-um/HEAD to point at jbf-um/master so
     that later I can say "git log jbf-um"

Or I could do

  $ git remote add -t 'ap/*' andy /home/andy/git.git

to make Andy's topic branches kept track of under refs/remotes/andy/ap/.

Other possible improvements I considered but haven't implemented
(hint, hint) are:

 * reject wildcard letters other than a trailing '*' to the -t
   parameter;

 * make -m optional and when the first -t parameter does not
   have the trailing '*' default to that value (so the above
   example does not need to say "-m master");

 * if -m is not given, and -t parameter ends with '*' (i.e. the
   above defaulting did not tell us where to point HEAD at), and
   if we did the fetch with -f, check if 'master' was fetched
   and make HEAD point at it.

Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-02-05 15:41:59 -08:00

364 lines
7.8 KiB
Perl
Executable file

#!/usr/bin/perl -w
use Git;
my $git = Git->repository();
sub add_remote_config {
my ($hash, $name, $what, $value) = @_;
if ($what eq 'url') {
if (exists $hash->{$name}{'URL'}) {
print STDERR "Warning: more than one remote.$name.url\n";
}
$hash->{$name}{'URL'} = $value;
}
elsif ($what eq 'fetch') {
$hash->{$name}{'FETCH'} ||= [];
push @{$hash->{$name}{'FETCH'}}, $value;
}
if (!exists $hash->{$name}{'SOURCE'}) {
$hash->{$name}{'SOURCE'} = 'config';
}
}
sub add_remote_remotes {
my ($hash, $file, $name) = @_;
if (exists $hash->{$name}) {
$hash->{$name}{'WARNING'} = 'ignored due to config';
return;
}
my $fh;
if (!open($fh, '<', $file)) {
print STDERR "Warning: cannot open $file\n";
return;
}
my $it = { 'SOURCE' => 'remotes' };
$hash->{$name} = $it;
while (<$fh>) {
chomp;
if (/^URL:\s*(.*)$/) {
# Having more than one is Ok -- it is used for push.
if (! exists $it->{'URL'}) {
$it->{'URL'} = $1;
}
}
elsif (/^Push:\s*(.*)$/) {
; # later
}
elsif (/^Pull:\s*(.*)$/) {
$it->{'FETCH'} ||= [];
push @{$it->{'FETCH'}}, $1;
}
elsif (/^\#/) {
; # ignore
}
else {
print STDERR "Warning: funny line in $file: $_\n";
}
}
close($fh);
}
sub list_remote {
my ($git) = @_;
my %seen = ();
my @remotes = eval {
$git->command(qw(config --get-regexp), '^remote\.');
};
for (@remotes) {
if (/^remote\.([^.]*)\.(\S*)\s+(.*)$/) {
add_remote_config(\%seen, $1, $2, $3);
}
}
my $dir = $git->repo_path() . "/remotes";
if (opendir(my $dh, $dir)) {
local $_;
while ($_ = readdir($dh)) {
chomp;
next if (! -f "$dir/$_" || ! -r _);
add_remote_remotes(\%seen, "$dir/$_", $_);
}
}
return \%seen;
}
sub add_branch_config {
my ($hash, $name, $what, $value) = @_;
if ($what eq 'remote') {
if (exists $hash->{$name}{'REMOTE'}) {
print STDERR "Warning: more than one branch.$name.remote\n";
}
$hash->{$name}{'REMOTE'} = $value;
}
elsif ($what eq 'merge') {
$hash->{$name}{'MERGE'} ||= [];
push @{$hash->{$name}{'MERGE'}}, $value;
}
}
sub list_branch {
my ($git) = @_;
my %seen = ();
my @branches = eval {
$git->command(qw(config --get-regexp), '^branch\.');
};
for (@branches) {
if (/^branch\.([^.]*)\.(\S*)\s+(.*)$/) {
add_branch_config(\%seen, $1, $2, $3);
}
}
return \%seen;
}
my $remote = list_remote($git);
my $branch = list_branch($git);
sub update_ls_remote {
my ($harder, $info) = @_;
return if (($harder == 0) ||
(($harder == 1) && exists $info->{'LS_REMOTE'}));
my @ref = map {
s|^[0-9a-f]{40}\s+refs/heads/||;
$_;
} $git->command(qw(ls-remote --heads), $info->{'URL'});
$info->{'LS_REMOTE'} = \@ref;
}
sub list_wildcard_mapping {
my ($forced, $ours, $ls) = @_;
my %refs;
for (@$ls) {
$refs{$_} = 01; # bit #0 to say "they have"
}
for ($git->command('for-each-ref', "refs/remotes/$ours")) {
chomp;
next unless (s|^[0-9a-f]{40}\s[a-z]+\srefs/remotes/$ours/||);
next if ($_ eq 'HEAD');
$refs{$_} ||= 0;
$refs{$_} |= 02; # bit #1 to say "we have"
}
my (@new, @stale, @tracked);
for (sort keys %refs) {
my $have = $refs{$_};
if ($have == 1) {
push @new, $_;
}
elsif ($have == 2) {
push @stale, $_;
}
elsif ($have == 3) {
push @tracked, $_;
}
}
return \@new, \@stale, \@tracked;
}
sub list_mapping {
my ($name, $info) = @_;
my $fetch = $info->{'FETCH'};
my $ls = $info->{'LS_REMOTE'};
my (@new, @stale, @tracked);
for (@$fetch) {
next unless (/(\+)?([^:]+):(.*)/);
my ($forced, $theirs, $ours) = ($1, $2, $3);
if ($theirs eq 'refs/heads/*' &&
$ours =~ /^refs\/remotes\/(.*)\/\*$/) {
# wildcard mapping
my ($w_new, $w_stale, $w_tracked)
= list_wildcard_mapping($forced, $1, $ls);
push @new, @$w_new;
push @stale, @$w_stale;
push @tracked, @$w_tracked;
}
elsif ($theirs =~ /\*/ || $ours =~ /\*/) {
print STDERR "Warning: unrecognized mapping in remotes.$name.fetch: $_\n";
}
elsif ($theirs =~ s|^refs/heads/||) {
if (!grep { $_ eq $theirs } @$ls) {
push @stale, $theirs;
}
elsif ($ours ne '') {
push @tracked, $theirs;
}
}
}
return \@new, \@stale, \@tracked;
}
sub show_mapping {
my ($name, $info) = @_;
my ($new, $stale, $tracked) = list_mapping($name, $info);
if (@$new) {
print " New remote branches (next fetch will store in remotes/$name)\n";
print " @$new\n";
}
if (@$stale) {
print " Stale tracking branches in remotes/$name (use 'git remote prune')\n";
print " @$stale\n";
}
if (@$tracked) {
print " Tracked remote branches\n";
print " @$tracked\n";
}
}
sub prune_remote {
my ($name, $ls_remote) = @_;
if (!exists $remote->{$name}) {
print STDERR "No such remote $name\n";
return;
}
my $info = $remote->{$name};
update_ls_remote($ls_remote, $info);
my ($new, $stale, $tracked) = list_mapping($name, $info);
my $prefix = "refs/remotes/$name";
foreach my $to_prune (@$stale) {
my @v = $git->command(qw(rev-parse --verify), "$prefix/$to_prune");
$git->command(qw(update-ref -d), "$prefix/$to_prune", $v[0]);
}
}
sub show_remote {
my ($name, $ls_remote) = @_;
if (!exists $remote->{$name}) {
print STDERR "No such remote $name\n";
return;
}
my $info = $remote->{$name};
update_ls_remote($ls_remote, $info);
print "* remote $name\n";
print " URL: $info->{'URL'}\n";
for my $branchname (sort keys %$branch) {
next if ($branch->{$branchname}{'REMOTE'} ne $name);
my @merged = map {
s|^refs/heads/||;
$_;
} split(' ',"@{$branch->{$branchname}{'MERGE'}}");
next unless (@merged);
print " Remote branch(es) merged with 'git pull' while on branch $branchname\n";
print " @merged\n";
}
if ($info->{'LS_REMOTE'}) {
show_mapping($name, $info);
}
}
sub add_remote {
my ($name, $url, $opts) = @_;
if (exists $remote->{$name}) {
print STDERR "remote $name already exists.\n";
exit(1);
}
$git->command('config', "remote.$name.url", $url);
my $track = $opts->{'track'} || ["*"];
for (@$track) {
$git->command('config', '--add', "remote.$name.fetch",
"+refs/heads/$_:refs/remotes/$name/$_");
}
if ($opts->{'fetch'}) {
$git->command('fetch', $name);
}
if (exists $opts->{'master'}) {
$git->command('symbolic-ref', "refs/remotes/$name/HEAD",
"refs/remotes/$name/$opts->{'master'}");
}
}
sub add_usage {
print STDERR "Usage: git remote add [-f] [-t track]* [-m master] <name> <url>\n";
exit(1);
}
if (!@ARGV) {
for (sort keys %$remote) {
print "$_\n";
}
}
elsif ($ARGV[0] eq 'show') {
my $ls_remote = 1;
my $i;
for ($i = 1; $i < @ARGV; $i++) {
if ($ARGV[$i] eq '-n') {
$ls_remote = 0;
}
else {
last;
}
}
if ($i >= @ARGV) {
print STDERR "Usage: git remote show <remote>\n";
exit(1);
}
for (; $i < @ARGV; $i++) {
show_remote($ARGV[$i], $ls_remote);
}
}
elsif ($ARGV[0] eq 'prune') {
my $ls_remote = 1;
my $i;
for ($i = 1; $i < @ARGV; $i++) {
if ($ARGV[$i] eq '-n') {
$ls_remote = 0;
}
else {
last;
}
}
if ($i >= @ARGV) {
print STDERR "Usage: git remote prune <remote>\n";
exit(1);
}
for (; $i < @ARGV; $i++) {
prune_remote($ARGV[$i], $ls_remote);
}
}
elsif ($ARGV[0] eq 'add') {
my %opts = ();
while (1 < @ARGV && $ARGV[1] =~ /^-/) {
my $opt = $ARGV[1];
shift @ARGV;
if ($opt eq '-f' || $opt eq '--fetch') {
$opts{'fetch'} = 1;
next;
}
if ($opt eq '-t' || $opt eq '--track') {
if (@ARGV < 1) {
add_usage();
}
$opts{'track'} ||= [];
push @{$opts{'track'}}, $ARGV[1];
shift @ARGV;
next;
}
if ($opt eq '-m' || $opt eq '--master') {
if ((@ARGV < 1) || exists $opts{'master'}) {
add_usage();
}
$opts{'master'} = $ARGV[1];
shift @ARGV;
next;
}
add_usage();
}
if (@ARGV != 3) {
add_usage();
}
add_remote($ARGV[1], $ARGV[2], \%opts);
}
else {
print STDERR "Usage: git remote\n";
print STDERR " git remote add <name> <url>\n";
print STDERR " git remote show <name>\n";
print STDERR " git remote prune <name>\n";
exit(1);
}