#!/usr/bin/perl

# gitolite shell, invoked from ~/.ssh/authorized_keys
# ----------------------------------------------------------------------

use FindBin;

BEGIN { $ENV{GL_BINDIR} = $FindBin::RealBin; }
use lib $ENV{GL_BINDIR};
use Gitolite::Rc;
use Gitolite::Common;
use Gitolite::Conf::Load;

use strict;
use warnings;

# the main() sub expects ssh-ish things; set them up...
if ( exists $ENV{G3T_USER} ) {
    in_local();    # file:// masquerading as ssh:// for easy testing
} elsif ( exists $ENV{SSH_CONNECTION} ) {
    in_ssh();
} elsif ( exists $ENV{REQUEST_URI} ) {
    in_http();
} else {
    _die "who the *heck* are you?";
}

main();

exit 0;

# ----------------------------------------------------------------------

# XXX lots of stuff from gl-auth-command is missing for now...

sub in_local {
    print STDERR "TRACE: gsh(", join( ")(", @ARGV ), ")\n";
    print STDERR "TRACE: gsh(SOC=$ENV{SSH_ORIGINAL_COMMAND})\n";
}

sub in_http {
    _die 'http not yet implemented...';
}

sub in_ssh {
}

# ----------------------------------------------------------------------

# call this once you are sure arg-1 is the username and SSH_ORIGINAL_COMMAND
# has been setup (even if it's not actually coming via ssh).
sub main {
    # set up the user
    my $user = $ENV{GL_USER} = shift @ARGV;

    # set up the repo and the attempted access
    my ( $verb, $repo ) = parse_soc();    # returns only for git commands
    sanity($repo);
    $ENV{GL_REPO} = $repo;
    my $aa = ( $verb =~ 'upload' ? 'R' : 'W' );

    # a ref of 'any' signifies that this is a pre-git check, where we don't
    # yet know the ref that will be eventually pushed (and even that won't
    # apply if it's a read operation).  See the matching code in access() for
    # more information.
    my $ret = access( $repo, $user, $aa, 'any' );
    trace( 1, "access($repo, $user, $aa, 'any')", "-> $ret" );
    _die $ret if $ret =~ /DENIED/;

    $repo = "'$rc{GL_REPO_BASE}/$repo.git'";
    exec( "git", "shell", "-c", "$verb $repo" );
}

# ----------------------------------------------------------------------

sub parse_soc {
    my $soc = $ENV{SSH_ORIGINAL_COMMAND};
    $soc ||= 'info';

    if ( $soc =~ m(^(git-(?:upload|receive)-pack) '/?(.*?)(?:\.git)?'$) ) {
        # TODO git archive
        my ( $verb, $repo ) = ( $1, $2 );
        _die "invalid repo name: '$repo'" if $repo !~ $REPONAME_PATT;
        trace( 2, "git command", $soc );
        return ( $verb, $repo );
    }

    # after this we should not return; caller expects us to handle it all here
    # and exit out

    _die "suspicious characters loitering about '$soc'" if $soc !~ $REMOTE_COMMAND_PATT;

    my @words = split ' ', $soc;
    if ( $rc{COMMANDS}{ $words[0] } ) {
        trace( 2, "gitolite command", $soc );
        _system( "gitolite", @words );
        exit 0;
    }

    _die "unknown git/gitolite command: $soc";
}

sub sanity {
    my $repo = shift;
    _die "'$repo' contains bad characters" if $repo !~ $REPONAME_PATT;
    _die "'$repo' ends with a '/'"         if $repo =~ m(/$);
    _die "'$repo' contains '..'"           if $repo =~ m(\.\.$);
}