[stgt] PATCH: support shared accounts in targets.conf

[Dax Kelson]

I tried creating a targets.conf with multiple targets, all with the same
outgoing account. 

Snippet from my targets.conf:

<target iqn.1999-07.com.gurulabs:station1>
        backing-store /srv/iscsi-luns/station1
        incominguser station1 letmein
        outgoinguser server1 itsreallyme
</target>

<target iqn.1999-07.com.gurulabs:station2>
        backing-store /srv/iscsi-luns/station2
        incominguser station2 letmein
        outgoinguser server1 itsreallyme
</target>

<target iqn.1999-07.com.gurulabs:station3>
        backing-store /srv/iscsi-luns/station3
        incominguser station3 letmein
        outgoinguser server1 itsreallyme
</target>

The current logic in tgt-admin doesn't having the same account (incoming
or outgoing) defined on multiple targets. The current logic always
deletes an account before adding which removes the account from any
already defined targets.

Attached is a tested patch to support the configuration above:

--- /usr/sbin/tgt-admin.orig	2010-04-28 12:49:49.000000000 -0600
+++ /usr/sbin/tgt-admin	2010-04-28 13:42:16.000000000 -0600
@@ -92,6 +92,7 @@
 my %tgtadm_output_name;
 my @largest_tid;
 my $next_tid;
+my %existing_accounts;
 
 # Look up which targets are configured
 sub process_targets {
@@ -121,6 +122,21 @@
 	$next_tid = $largest_tid[$#largest_tid];
 }
 
+sub process_accounts {
+	# We need to run as root
+	if ( $> ) {
+		die("You must be root to run this program.\n");
+	}
+
+	my @show_account = `tgtadm --op show --mode account`;
+	# Here, we create an array of accounts
+	foreach my $show_account_line (@show_account) {
+		if ( $show_account_line =~ m/^\s+(.*?)$/ ) {
+			$existing_accounts{$1} = 1;
+		}
+	}
+}
+
 # Parse config file(s)
 sub parse_configs {
 	# Parse the config
@@ -599,8 +615,12 @@
 		foreach my $incominguser (@value_arr) {
 			my @userpass = split(/ /, $incominguser);
 			check_value($userpass[1]);
-			execute("tgtadm --lld $driver --mode account --op delete --user=$userpass[0]");
-			execute("tgtadm --lld $driver --mode account --op new --user=$userpass[0] --password=$userpass[1]");
+			# Only delete or create account if it doesn't already exist
+			if (! exists $existing_accounts{$userpass[0]} ) {
+				execute("tgtadm --lld $driver --mode account --op delete --user=$userpass[0]");
+				execute("tgtadm --lld $driver --mode account --op new --user=$userpass[0] --password=$userpass[1]");
+				$existing_accounts{$userpass[0]} = 1;
+			}
 			execute("tgtadm --lld $driver --mode account --op bind --tid=$next_tid --user=$userpass[0]");
 		}
 	}
@@ -613,8 +633,12 @@
 		}
 		my @userpass = split(/ /, @$value[0]);
 		check_value($userpass[1]);
-		execute("tgtadm --lld $driver --mode account --op delete --user=$userpass[0]");
-		execute("tgtadm --lld $driver --mode account --op new --user=$userpass[0] --password=$userpass[1]");
+		# Only delete or create account if it doesn't already exist
+		if (! exists $existing_accounts{$userpass[0]} ) {
+			execute("tgtadm --lld $driver --mode account --op delete --user=$userpass[0]");
+			execute("tgtadm --lld $driver --mode account --op new --user=$userpass[0] --password=$userpass[1]");
+			$existing_accounts{$userpass[0]} = 1;
+		}
 		execute("tgtadm --lld $driver --mode account --op bind --tid=$next_tid --user=$userpass[0] --outgoing");
 	}
 
@@ -1166,12 +1190,14 @@
 
 if ($execute == 1) {
 	process_targets;
+	process_accounts;
 	parse_configs;
 	add_targets;
 	remove_targets;
 } elsif ($delete ne 0) {
 	delete_targets;
 } elsif ($update ne 0) {
+	process_accounts;
 	update_targets;
 } elsif ($dump == 1) {
 	dump_config;


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