From af4abf85a0f06568e1bed0cd2e3b36363b0b37ed Mon Sep 17 00:00:00 2001
From: Michael Gernoth <michael@gernoth.net>
Date: Thu, 17 Dec 2009 16:34:21 +0100
Subject: [PATCH] change uid when invoked as root

---
 upsgraph.pl | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/upsgraph.pl b/upsgraph.pl
index aa77721..bef10a5 100755
--- a/upsgraph.pl
+++ b/upsgraph.pl
@@ -1,7 +1,7 @@
 #!/usr/bin/perl -w
 
-if (@ARGV != 3) {
-	print STDERR "Syntax: ${0} host /path/to/file.rrd /output/directory/\n";
+if ((@ARGV != 3) && (@ARGV != 4)) {
+	print STDERR "Syntax: ${0} host /path/to/file.rrd /output/directory/ [uid]\n";
 	exit(1);
 }
 
@@ -97,6 +97,16 @@ my $vars = {
 
 use Net::SNMP;
 
+if ($> == 0) {
+	if (@ARGV != 4) {
+		print STDERR "Running as root, please provide UID as 4th argument!\n";
+		exit(1);
+	}
+
+	print "Running as root, switching to ".$ARGV[3]."\n";
+	$< = $> = $ARGV[3];
+}
+
 if (! -e "${rrdfile}") {
 	my $cmd = "rrdtool create \"${rrdfile}\" ";
 	foreach my $var (@fields) {
-- 
2.39.2