If running as root, only switch the effective uid and gid back if we have

actually switched them before.

CHANGELOG

@@ -15,6 +15,8 @@ Version 0.7.1   - UNRELEASED
   * New option --copy: archive mail, but don't delete it from the mailbox. 
     This is mainly useful for testing purposes, and complements --delete.
     Closes: #981865, #988803, #1764851, Debian bug #434798
+  * If running as root, only switch the effective uid and gid back if we have
+    actually switched them before. Closes: #1762907
 
 Version 0.7.0   - 2 November 2006
   * Fixed long options --filter-append and --pwfile to accept their arguments.

archivemail.py

@@ -1173,7 +1173,7 @@ def archive(mailbox_name):
         clean_up()
 
         # if we are running as root, revert the seteuid()/setegid() above
-        if (os.getuid() == 0):
+        if former_gid != None:
             vprint("changing effective groupid and userid back to root")
             os.setegid(former_gid)
             os.seteuid(0)