Add merge-group.pl

merge-group.pl

@@ -0,0 +1,42 @@
+#! /usr/bin/perl
+use strict;
+use warnings;
+
+if (scalar @ARGV < 1) {
+        die "Usage: $0 <lowest_gid>";
+}
+
+my $LOWEST_PVV_GID = int($ARGV[0]);
+
+my @lines = ();
+
+# Read old group file
+open(IN, "/etc/group") || die "Unable to open /etc/group: $!";
+while(<IN>) {
+        my @parts = split(":");
+        if ($parts[2] < $LOWEST_PVV_GID || $parts[0] eq "nogroup") {
+                push @lines, $_;
+        }
+}
+close IN || die "Unable to close /etc/group: $!";
+
+# Read pvv group file
+my $groupcount = 0;
+open(PVV, "/etc/group.pvv") || die "Unable to open /etc/group.pvv: $!";
+while(<PVV>) {
+        ++$groupcount;
+        push @lines, $_;
+}
+close PVV || die "Unable to close /etc/group.pvv: $!";
+
+if ($groupcount < 200) {
+        die "/etc/group.pvv has less than 200 groups, something went wrong";
+}
+
+open(OUT, ">/etc/group.tmp") || die "Unable to open /etc/group.tmp for writing: $!";
+foreach (@lines) {
+        print OUT $_ || die "Can't write to /etc/group.tmp: $!";
+}
+close OUT || die "Unable to close /etc/group.tmp: $!";
+
+rename "/etc/group.tmp", "/etc/group" || die "Unable to move /etc/group.tmp to /etc/group: $!";