explaining why -type l is needed instead of -P, which is the default

debian/debian/hudson.postinst

@@ -37,6 +37,8 @@ case "$1" in
         find /var/lib/hudson -path "*jobs" -prune -o -type l -prune -o -exec chown hudson:adm {} + || true
     	chown -R hudson:adm /var/run/hudson /var/log/hudson
     	# change mode to 750 - exclude jobs and .ssh directories. See HUDSON-4047
+        # we prune symlinks instead of -P to avoid chmod/chown getting symlinks as arguments
+        # (which ends up changing the target of the symlink, even though it's not recursive)
         find /var/lib/hudson -path "*jobs" -prune -o -path "*.ssh" -prune -o -type l -prune -o -exec chmod 750 {} + || true
     	chmod -R 750 /var/run/hudson
     	chmod 750 /var/log/hudson