Add a rootcheck, stolen from livecd-creator

Changelog

@@ -1,6 +1,7 @@
 * Sun Aug 26 2007 Jesse Keating <jkeating@redhat.com>
 - Add better support for %packages syntax using native pykickstart
 - Add a cache dir for pungi (/var/cache/pungi) and a cli option to override
+- Add root check.
 
 * Sat Aug 25 2007 Jesse Keating <jkeating@redhat.com>
 - Use a kickstart file as input now (for cdsize and package manifest)

ToDo

@@ -50,7 +50,7 @@ DONE ^^
   Drop all stuff but GPL, README, GPG keys, potentially README-BURNING-ISOS ?
 
 * From livecd-creator
-  Steal root check
+  Steal root check *DONE*
   Use same cli syntax if possible (conf -> config, etc..)
 
 * Figure out how to allow use of $releasever and $basearch

pungi

@@ -22,6 +22,12 @@ import pykickstart.version
 from ConfigParser import SafeConfigParser
 
 def main():
+
+    # You must be this high to ride.
+    if os.geteuid () != 0:
+        print >> sys.stderr, "You must run livecd-creator as root"
+        return 1
+
     # Set some default variables, can be overrided in config file
 
     # Turn this into a dict someday, to iterate over when setting defaults