savelogs.proxy.in 3.14 KB
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#!/usr/bin/perl -w

#
# EMULAB-COPYRIGHT
# Copyright (c) 2000-2004 University of Utah and the Flux Group.
# All rights reserved.
#

use English;
use Getopt::Std;
use BSD::Resource;
use POSIX qw(:signal_h);
    
#
# Save off console log files.
# 
# The first argument option is the user to run this script as, since we
# gets invoked by a root ssh from boss.
#
sub usage()
{
    print STDOUT
	"Usage: savelogs.proxy -u user -s savedir nodeid vname [...]\n";
    exit(-1);
}

#
# Configure variables
#
my $TB       = "@prefix@";
my $TBOPS    = "@TBOPSEMAIL@";
my $logdir   = "/var/log/tiplogs";
my $errors   = 0;

#
# Turn off line buffering on output
#
$| = 1;

#
# Untaint the path
# 
$ENV{'PATH'} = "/bin:/usr/bin:/sbin:/usr/sbin";
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

#
# Testbed Support libraries
#
use lib "@prefix@/lib";
use libtestbed;

#
# First option has to be the -u option, the user to run this script as.
#
if ($UID != 0 || $EUID != 0) {
    die("*** $0:\n".
	"    Must be root to run this script!\n");
}
if ($ARGV[0] ne "-u" ||
    $ARGV[2] ne "-s" ||
    scalar(@ARGV) < 6 ||
    scalar(@ARGV) & 0x1) {
    usage();
}

my $user    = $ARGV[1];
my $savedir = $ARGV[3];
shift(@ARGV);
shift(@ARGV);
shift(@ARGV);
shift(@ARGV);

(undef,undef,$unix_uid) = getpwnam($user) or
    die("*** $0:\n".
	"    No such user $user\n");

#
# Need the entire group list for the user, cause of subgroups, and
# cause thats the correct thing to do. Too bad perl does not have a
# getgrouplist function like the C library.
#
my $glist = `/usr/bin/id -G $user`;
if ($glist =~ /^([\d ]*)$/) {
    $glist = $1;
}
else {
    die("*** $0:\n".
	"    Unexpected results from 'id -G $user': $glist\n");
}

# Need to split off the first group and create a proper list for $GUID.
my @gglist   = split(" ", $glist);
my $unix_gid = $gglist[0];
$glist       = "$unix_gid $glist";

# Flip to user and never go back!
$GID            = $unix_gid;
$EGID           = $glist;
$EUID = $UID    = $unix_uid;
$ENV{'USER'}    = $user;
$ENV{'LOGNAME'} = $user;

#
# Okay, now we can save logs for each console.
# 
print "Saving tiplogs to $savedir\n";

if (! -e $savedir) {
    # We do not want directory creation to be modified by the user's umask, 
    # because the tiplogs directory needs to be kept group-writable.
    my $savemask = umask 000;
    
    print "Making directory $savedir ...\n";
    system("/bin/mkdir -m 0770 -p $savedir") == 0
	or die("*** $0:\n".
	       "    Unable to make directory $savedir!\n");

    # Restore the saved umask
    umask $savemask;
}

# Make sure the user can write to it
if (! -w $savedir) {
    die("*** $0:\n".
	"    Unable to write to directory $savedir\n");
}

while (@ARGV) {
    my $nodeid   = shift(@ARGV);
    my $vname    = shift(@ARGV);
    my $runfile  = "$logdir/$nodeid.run";
    my $savefile = "$savedir/$vname.log";
    
    print "Copying $runfile to $savefile ...\n";
    # Test to make sure the .run file exists
    if (! (-e $runfile && -r $runfile) ) {
	print "*** WARNING:\n".
	      "Console log for $nodeid does not exist or is not readable. ".
	      "Skipping.\n";
	$errors++;
	next;
    }
    system("/bin/cp $runfile $savefile") == 0
	or $errors++;
}
exit($errors);