taskd/taskd.pl

   1 #!/usr/bin/perl
   2 #
   3 # taskd - Clone repositories on request
   4 #
   5 # taskd is Girocco mirroring servant; it processes requests for clones
   6 # of given URLs received over its socket.
   7 #
   8 # When a request is received, new process is spawned that sets up
   9 # the repository and reports further progress
  10 # to .clonelog within the repository. In case the clone fails,
  11 # .clone_failed is touched and .clone_in_progress is removed.
  12
  13 # Clone protocol:
  14 # Alice sets up repository and touches .cloning
  15 # Alice opens connection to Bob
  16 # Alice sends project name through the connection
  17 # Bob opens the repository and sends error code if there is a problem
  18 # Bob closes connection
  19 # Alice polls .clonelog in case of success.
  20 # If Alice reads "@OVER@" from .clonelog, it stops polling.
  21
  22 # Ref-change protocol:
  23 # Alice opens connection to Bob
  24 # Alice sends ref-change command for each changed ref
  25 # Alice closes connection
  26 # Bob sends out notifications
  27
  28 # Based on perlipc example.
  29
  30 use strict;
  31 use warnings;
  32
  33 use Girocco::Config;
  34 use Girocco::Notify;
  35 use Girocco::Project;
  36 use Socket;
  37
  38 $| = 1;
  39
  40 sub logmsg { print '['.(scalar localtime)."] $0 $$: @_\n" }
  41
  42 my $NAME = $Girocco::Config::chroot.'/etc/taskd.socket';
  43 my $uaddr = sockaddr_un($NAME);
  44
  45 socket(Server, PF_UNIX, SOCK_STREAM, 0) or die "socket: $!";
  46 unlink($NAME);
  47 bind(Server, $uaddr) or die "bind: $!";
  48 listen(Server, SOMAXCONN) or die "listen: $!";
  49 chmod 0666, $NAME or die "chmod: $!";
  50
  51
  52 use POSIX ":sys_wait_h";
  53 sub REAPER {
  54         my $child;
  55         my $waitedpid;
  56         while (($waitedpid = waitpid(-1, WNOHANG)) > 0) {
  57                 logmsg "reaped $waitedpid" . ($? ? " with exit $?" : '');
  58         }
  59         $SIG{CHLD} = \&REAPER;  # loathe sysV
  60 }
  61
  62 $SIG{CHLD} = \&REAPER;  # Apollo 440
  63
  64 sub spawn {
  65         my $coderef = shift;
  66
  67         my $pid = fork;
  68         if (not defined $pid) {
  69                 logmsg "cannot fork: $!";
  70                 return;
  71         } elsif ($pid) {
  72                 logmsg "begat $pid";
  73                 return; # I'm the parent
  74         }
  75
  76         open STDIN, "<&Client" or die "can't dup client to stdin";
  77         open STDOUT, ">&Client" or die "can't dup client to stdout";
  78         exit &$coderef();
  79 }
  80
  81 sub clone {
  82         my ($name) = @_;
  83         my $proj = Girocco::Project->load($name);
  84         $proj or die "failed to load project $name";
  85         $proj->{clone_in_progress} or die "project $name is not marked for cloning";
  86         $proj->{clone_logged} and die "project $name is already being cloned";
  87         print STDERR "cloning $name\n";
  88         open STDOUT, ">".$Girocco::Config::reporoot."/".$name.".git/.clonelog" or die "cannot open clonelog: $!";
  89         open STDERR, ">&STDOUT";
  90         open STDIN, "</dev/null";
  91         exec $Girocco::Config::basedir.'/taskd/clone.sh', "$name.git" or die "exec failed: $!";
  92 }
  93
  94 sub ref_change {
  95         my ($arg) = @_;
  96         my ($name, $oldrev, $newrev, $ref) = split(/\s+/, $arg);
  97         my $proj = Girocco::Project->load($name);
  98         $proj or die "failed to load project $name";
  99         print STDERR "ref-change $name ($ref: $oldrev -> $newrev)\n";
 100         open STDIN, "</dev/null";
 101         Girocco::Notify::ref_change($proj, $ref, $oldrev, $newrev);
 102 }
 103
 104 while (1) {
 105         unless (accept(Client, Server)) {
 106                 logmsg "accept failed: $!";
 107                 next;
 108         }
 109         logmsg "connection on $NAME";
 110         spawn sub {
 111                 my $inp = <>;
 112                 chomp $inp;
 113                 my ($cmd, $arg) = $inp =~ /^([a-zA-Z0-9-]+)\s+(.*)$/;
 114                 if ($cmd eq 'clone') {
 115                         clone($arg);
 116                 } elsif ($cmd eq 'ref-change') {
 117                         ref_change($arg);
 118                 } else {
 119                         die "unknown command: $cmd";
 120                 }
 121         };
 122         close Client;
 123         sleep 1;
 124 }