Index: /trunk/packages/invirt-dev/debian/changelog
===================================================================
--- /trunk/packages/invirt-dev/debian/changelog	(revision 2555)
+++ /trunk/packages/invirt-dev/debian/changelog	(revision 2556)
@@ -4,6 +4,9 @@
   * Generate the apt repository configuration using gen-files instead of
     rolling our own.
-
- -- Evan Broder <broder@mit.edu>  Sun, 22 Nov 2009 15:57:59 -0500
+  * Since the prerm code to remove the repo group from sudoers runs on
+    upgrades, make sure the postinst code to add it back runs on all
+    upgrades, too.
+
+ -- Evan Broder <broder@mit.edu>  Sun, 22 Nov 2009 17:57:21 -0500
 
 invirt-dev (0.0.14) unstable; urgency=low
Index: /trunk/packages/invirt-dev/debian/invirt-dev.postinst
===================================================================
--- /trunk/packages/invirt-dev/debian/invirt-dev.postinst	(revision 2555)
+++ /trunk/packages/invirt-dev/debian/invirt-dev.postinst	(revision 2556)
@@ -6,21 +6,23 @@
 case "$1" in
     configure)
-        if [ -z "$2" ]; then
+	if ! getent passwd repository >/dev/null 2>&1; then
             adduser --system repository
+	fi
+	if ! getent group repo >/dev/null 2>&1; then
             addgroup --system repo
+	fi
             
-            cat >>/etc/sudoers <<EOF
+        cat >>/etc/sudoers <<EOF
 ### BEGIN invirt-dev
 %repo   ALL=(repository)        ALWAYS_SET_HOME,NOPASSWD: /usr/bin/reprepro
 ### END invirt-dev
 EOF
-            echo "-----"
-            echo "invirt-dev: run"
-            echo "  adduser --disabled-password \$user"
-            echo "  adduser \$user repo"
-            echo "  adduser \$user sbuild"
-            echo "to make individual users that will build packages."
-            echo "-----"
-        fi
+        echo "-----"
+        echo "invirt-dev: run"
+        echo "  adduser --disabled-password \$user"
+        echo "  adduser \$user repo"
+        echo "  adduser \$user sbuild"
+        echo "to make individual users that will build packages."
+        echo "-----"
     ;;