5 Simple tracking of remote files in central git repository
6 with only shell, netcat, rsync and ssh on client
8 Start server, install on remote-host or upgrade with:
10 ./bak-git-server.pl /path/to/backup 192.168.42.42
11 [--install remote-host]
14 C<rsync> traffic is always transfered over ssh, but C<diff> or C<ch> can
15 still leak sensitive information if C<bak> shell client connects directly
18 Add following line to C<~/.ssh/config> under C<Host> for which you want encrypted
19 controll channel (or to pass through server ssh hops using C<ProxyCommand>)
21 RemoteForward 9001 192.168.42.42:9001
26 bak commit [/path [message]]
27 bak diff [host:][/path]
33 bak revert [host:]/path
38 bak - push all changed files to server
40 See L<http://blog.rot13.org/bak-git> for more information
55 'upgrade!' => \$upgrade,
56 'install=s' => \$install,
59 my ( $dir, $server_ip ) = @ARGV;
60 die "usage: $0 /backup/directory 127.0.0.1\n" unless $dir;
61 $server_ip ||= '127.0.0.1';
65 open(my $ssh_fd, '<', "$ENV{HOME}/.ssh/config");
69 next unless length($_) > 0;
72 if ( /^Host\s+(.+)/i ) {
74 } elsif ( /^\s+(\S+)\s+(.+)/ ) {
75 $ssh_tunnel->{$host}++ if lc($1) eq 'remoteforward' && $2 =~ m/9001/;
82 my ( $hostname ) = @_;
83 my $path = '/tmp/bak';
84 my $server = $server_ip;
85 $server = '127.0.0.1' if $ssh_tunnel->{$hostname};
86 warn "# ssh_client $hostname $server";
87 open(my $fh, '>', $path);
88 print $fh "#!/bin/sh\n";
89 print $fh "echo \$USER/\$SUDO_USER $hostname `pwd` \$* | nc $server 9001\n";
96 while ( my($host,$pid) = each %$ssh_tunnel ) {
97 warn "$host kill TERM $pid";
103 $SIG{TERM} = &_kill_ssh;
106 system 'git init' unless -e '.git';
108 if ( $upgrade || $install ) {
110 my @hosts = grep { -d $_ } glob '*';
111 @hosts = ( $install ) if $install;
113 foreach my $hostname ( @hosts ) {
114 warn "install on $hostname\n";
115 system 'ssh-copy-id', "root\@$hostname" if ! -d $hostname;
116 my $path = shell_client( $hostname );
117 system "scp $path root\@$hostname:/usr/local/bin/";
118 system "ssh root\@$hostname apt-get install -y netcat rsync";
121 my $ssh = $ENV{SSH} || 'ssh';
122 warn "# start $ssh tunnels...";
123 foreach my $host ( keys %$ssh_tunnel ) {
126 if ( ! defined $pid ) {
130 warn "FIXME: waitpid $pid";
132 warn "EXEC $ssh $host";
133 exec "$ssh -N root\@$host";
136 $ssh_tunnel->{$host} = $pid;
140 warn "dir: $dir listen: $server_ip:9001\n";
142 my $server = IO::Socket::INET->new(
144 # LocalAddr => $server_ip,
152 warn "# rsync ",join(' ', @_), "\n";
157 my $hostname = shift;
158 system "find $hostname -type f | sed 's,$hostname,,' > /tmp/$hostname.list";
160 open(my $files, '>>', "/tmp/$hostname.list");
161 print $files "$_\n" foreach @_;
164 rsync split / /, "-avv --files-from /tmp/$hostname.list root\@$hostname:/ $hostname/";
167 while (my $client = $server->accept()) {
168 my $line = <$client>;
171 my ($user,$hostname,$pwd,$command,$rel_path,$message) = split(/\s+/,$line,6);
172 $hostname =~ s/\..+$//;
175 if ( $rel_path =~ s/^([^:]+):(.+)$/$2/ ) {
179 print $client "host $1 doesn't exist in backup\n";
183 my $path = $rel_path =~ m{^/} ? $rel_path : "$pwd/$rel_path";
185 warn "$hostname [$command] $on_host:$path | $message\n";
187 my $args_message = $message;
189 $message ||= "$path [$command]";
190 $message = "$hostname: $message";
193 $dir =~ s{/[^/]+$}{};
195 my $backup_path = -e "$hostname/$path" ? "$hostname/$path" : $hostname;
198 my $args = join(' ',@_);
199 warn "# git $args\n";
200 my $out = `git $args`;
201 warn "$out\n# [", length($out), " bytes]\n" if defined $out;
206 pull_changes $hostname;
207 } elsif ( $command eq 'add' ) {
208 mkpath "$hostname/$dir" unless -e "$hostname/$dir";
210 rsync( '-avv', "root\@$hostname:$path", "$hostname/$path" );
211 print $client git 'add', "$hostname/$path";
213 $args_message =~ s/^(.+)\b// || last;
217 } elsif ( $command eq 'commit' ) {
218 pull_changes $hostname;
219 $message =~ s/'/\\'/g;
221 print $client git( "commit -m '$message' --author '$user <$hostname>' $backup_path" );
222 } elsif ( $command =~ m{(diff|status|log|ch)} ) {
223 $command .= ' --stat' if $command eq 'log';
224 $command = 'log --patch-with-stat' if $command =~ m/^ch/;
225 pull_changes( $hostname ) if $command eq 'diff';
227 mkpath $_ foreach grep { ! -e $_ } ( "$hostname/$dir", "$on_host/$dir" );
228 rsync( '-avv', "root\@$hostname:$path", "$hostname/$path" );
229 rsync( '-avv', "root\@$on_host:$path", "$on_host/$path" );
230 open(my $diff, '-|', "diff -Nuw $hostname$path $on_host$path");
235 # commands without path will show host-wide status/changes
236 my $backup_path = $path ? "$hostname/$path" : "$hostname/";
237 # hostname must end with / to prevent error from git:
238 # ambiguous argument 'arh-hw': both revision and filename
239 # to support branches named as hosts
240 print $client git($command, $backup_path);
242 } elsif ( $command eq 'revert' ) {
244 rsync( '-avv', "$on_host/$path", "root\@$hostname:$path" );
246 print $client git "checkout -- $hostname/$path";
247 rsync( '-avv', "$hostname/$path", "root\@$hostname:$path" );
249 } elsif ( $command eq 'cat' ) {
250 my $file_path = ( $on_host ? $on_host : $hostname ) . "/$path";
251 open(my $file, '<', $file_path) || warn "ERROR $file_path: $!";
256 } elsif ( $command eq 'ls' ) {
257 print $client `ls $backup_path`;
258 } elsif ( $command eq 'show' ) {
259 print $client `git show $rel_path`;
260 } elsif ( $command eq 'grep' ) {
261 print $client `git log -g --grep=$rel_path`;
263 print $client "Unknown command: $command\n";