compile

#!/usr/bin/perl -w
# -*- perl -*-

# Cricket: a configuration, polling and data display wrapper for RRD files
#
#    Copyright (C) 1998 Jeff R. Allen and WebTV Networks, Inc.
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

BEGIN {
	my $programdir = (($0 =~ m:^(.*/):)[0] || "./") . ".";
	eval "require '$programdir/cricket-conf.pl'";
	eval "require '/usr/local/etc/cricket-conf.pl'"
					unless $Common::global::gInstallRoot;
	$Common::global::gInstallRoot ||= $programdir;
}

use lib "$Common::global::gInstallRoot/lib";

use Common::Version;
use Common::global;
use Common::Log;
use Common::Options;
use Common::Util;
use Common::Map;
use Common::HandleTarget;
use ConfigTree::Node;

my $starttime = time();

Common::Options::commonOptions();

Info("Starting compile: $Common::global::gVersion");
my($nodeCt, $fileCt) = (0, 0);

$gCT = new ConfigTree::Node;
$gCT->info(\&Common::Log::Info);
$gCT->warn(\&Common::Log::Warn);
$gCT->debug(\&Common::Log::Debug);
$gCT->Base($Common::global::gConfigRoot);

if (&check_and_set_lock) {
	exit;
}
$gCT->init();
$gCT->processTree();

($nodeCt, $fileCt) = $gCT->compile();

# log summary info before exiting
$time = runTime($starttime);
Info("Processed $nodeCt nodes (in $fileCt files) in $time.");
&unlock;

exit;

sub check_and_set_lock {
    my $lockfile = $gCT->Base() . "/config.db.lock";
    my $tries = 0;
    while (-f $lockfile) {
        my $now      = time();
        my $db_mtime = (stat $lockfile)[9];
        # Do not recompile if another process already is busy compiling
        if (($now - $db_mtime) < 900) {
            $tries++;
            if ($tries >= 5) {
                Warn("Skipping recompile; already in progress");
                return 1;
            }
            Warn("Lockfile found, sleeping 5 secs.");
            sleep 5;
        } else {
            # But warn if that other process is dead
            Warn("Forcing recompile; previous compile aborted?");
            unlink $lockfile
                or die "Failed to release lock; unlink($lockfile) returned: $!\n";
        }
    }
    open LOCK, ">$lockfile"
        or die "Can't create lockfile; open($lockfile) returned: $!\n";
    print LOCK "$$\n";
    close LOCK;
    return 0;
}

sub unlock {
    my $lockfile = $gCT->Base() . "/config.db.lock";
    unlink $lockfile;
}