kbuild, deb-pkg: improve maintainer identification

Try harder to find email and maintainer name.
Debian's own devscripts all use DEBEMAIL or DEBFULLNAME prior to an
eventual EMAIL or NAME environment variable. Match their logic.

"Anonymous" sounds nicer then "Kernel Compiler" if no name is found.
Signed-off-by: maximilian attems <max@stro.at>
Signed-off-by: Frans Pop <elendil@planet.nl>
Cc: Andres Salomon <dilinger@debian.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

scripts/package/builddeb

@@ -95,14 +95,30 @@ EOF
 	chmod 755 "$tmpdir/DEBIAN/$script"
 done
 
-name="Kernel Compiler <$(id -nu)@$(hostname -f)>"
+# Try to determine maintainer and email values
+if [ -n "$DEBEMAIL" ]; then
+       email=$DEBEMAIL
+elif [ -n "$EMAIL" ]; then
+       email=$EMAIL
+else
+       email=$(id -nu)@$(hostname -f)
+fi
+if [ -n "$DEBFULLNAME" ]; then
+       name=$DEBFULLNAME
+elif [ -n "$NAME" ]; then
+       name=$NAME
+else
+       name="Anonymous"
+fi
+maintainer="$name <$email>"
+
 # Generate a simple changelog template
 cat <<EOF > debian/changelog
 linux ($packageversion) unstable; urgency=low
 
   * Custom built Linux kernel.
 
- -- $name  $(date -R)
+ -- $maintainer  $(date -R)
 EOF
 
 # Generate copyright file
@@ -130,7 +146,7 @@ cat <<EOF > debian/control
 Source: linux
 Section: base
 Priority: optional
-Maintainer: $name
+Maintainer: $maintainer
 Standards-Version: 3.6.1
 EOF