Fix up problem with symlinks getting left behind from /proj to /groups.

db/libdb.pm.in

@@ -25,6 +25,7 @@ use Exporter;
 	 PROJMEMBERTRUST_ROOT PROJMEMBERTRUST_GROUPROOT
 	 PROJMEMBERTRUST_PROJROOT
 
+	 PROJROOT GROUPROOT USERROOT
 	 PLABMOND_PID PLABMOND_EID PLABHOLDING_PID PLABHOLDING_EID
 
 	 TBTrustConvert TBMinTrust TBGrpTrust TBProjTrust
@@ -193,6 +194,9 @@ my $BOSSNODE    = "@BOSSNODE@";
 my $TESTMODE    = @TESTMODE@;
 my $TBOPSPID	= "emulab-ops";
 my $SCRIPTNAME  = "Unknown";
+my $PROJROOT    = "/proj";
+my $GROUPROOT   = "/groups";
+my $USERROOT    = "/users";
 
 if ($EVENTSYS) {
     require event;
@@ -277,6 +281,9 @@ sub PLABMOND_PID()		{ $TBOPSPID; }
 sub PLABMOND_EID()		{ "plab-monitor"; }
 sub PLABHOLDING_PID()		{ $TBOPSPID; }
 sub PLABHOLDING_EID()		{ "plabnodes"; }
+sub PROJROOT()			{ $PROJROOT; }
+sub GROUPROOT()			{ $GROUPROOT; }
+sub USERROOT()			{ $USERROOT; }
 
 sub NODEBOOTSTATUS_OKAY()	{ "okay" ; }
 sub NODEBOOTSTATUS_FAILED()	{ "failed"; }
@@ -2527,6 +2534,7 @@ sub TBExptDestroy($$)
 
     my $workdir = TBExptWorkDir($pid, $eid);
     my $userdir = TBExptUserDir($pid, $eid);
+    my $gid     = ExpGroup($pid, $eid);
 
     #
     # Try to remove experiment directory. We allow for it not being there
@@ -2544,6 +2552,12 @@ sub TBExptDestroy($$)
 	print "*** WARNING: Not able to remove $workdir\n";
 	print "             Someone will need to do this by hand.\n";
     }
+    # Yuck.
+    if ($pid ne $gid) {
+	my $eidlink = "$PROJROOT/$pid/exp/$eid";
+	unlink($eidlink)
+	    if (-l $eidlink);
+    }
 
     #
     # Remove all trace from the DB.

tbsetup/mkexpdir.in

@@ -28,8 +28,8 @@ my $TBOPS    = "@TBOPSEMAIL@";
 #
 # Should be configured.
 # 
-my $projroot = "/proj";
-my $grouproot= "/groups";
+my $projroot = PROJROOT();
+my $grouproot= GROUPROOT();
 
 #
 # Testbed Support libraries
@@ -172,7 +172,7 @@ if (! chown($UID, $unix_gid, "$workdir")) {
 if ($pid ne $gid) {
     # XXX Bad. This link should be removed when the experiment is removed.
     unlink($eidlink)
-	if (-e $eidlink);
+	if (-l $eidlink);
     symlink($eiddir, $eidlink) or
 	fatal("Could not symlink($eiddir, $eidlink): $!");
 }