From 23e20007a9966258a11ff9943376eb73862ff987 Mon Sep 17 00:00:00 2001
From: Albert Hopkins <marduk@python.net>
Date: Tue, 28 Jun 2011 08:20:05 -0400
Subject: [PATCH] Make it so no kernel is compiled if a kernel is installed in
 /boot and an emerge will only install the same kernel.

This (and other) logic really needs to be moved out of Makefile and into a
shell script where it can be better maintained and not look so ugly.
---
 Makefile | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/Makefile b/Makefile
index c9ee5bf..21f011f 100644
--- a/Makefile
+++ b/Makefile
@@ -168,18 +168,23 @@ kernel: base_system $(KERNEL_CONFIG)
 	$(inroot) cp /usr/share/zoneinfo/$(TIMEZONE) /etc/localtime
 	echo $(TIMEZONE) > "$(CHROOT)"/etc/timezone
 ifneq ($(EXTERNAL_KERNEL),YES)
-	$(inroot) $(EMERGE) $(USEPKG) sys-kernel/$(KERNEL)
-	cp $(KERNEL_CONFIG) $(CHROOT)/usr/src/linux/.config
-	$(gcc_config)
-	$(inroot) make $(MAKEOPTS) -C /usr/src/linux oldconfig
-	$(inroot) make $(MAKEOPTS) -C /usr/src/linux
-	$(inroot) rm -rf /lib/modules/*
-	$(inroot) make $(MAKEOPTS) -C /usr/src/linux modules_install
-	$(inroot) rm -f /boot/vmlinuz*
-	$(inroot) make $(MAKEOPTS) -C /usr/src/linux install
+	if [ -e "$(CHROOT)/boot/vmlinuz" ] && $(inroot) emerge -pq sys-kernel/$(KERNEL)|grep '^\[.*R.*\]' >/dev/null ; \
+	then \
+	/bin/true ; \
+	else \
+	$(inroot) $(EMERGE) $(USEPKG) sys-kernel/$(KERNEL) ; \
+	cp $(KERNEL_CONFIG) $(CHROOT)/usr/src/linux/.config ; \
+	$(gcc_config) ; \
+	$(inroot) make $(MAKEOPTS) -C /usr/src/linux oldconfig ; \
+	$(inroot) make $(MAKEOPTS) -C /usr/src/linux ; \
+	$(inroot) rm -rf /lib/modules/* ; \
+	$(inroot) make $(MAKEOPTS) -C /usr/src/linux modules_install ; \
+	$(inroot) rm -f /boot/vmlinuz* ; \
+	$(inroot) make $(MAKEOPTS) -C /usr/src/linux install ; \
 	cd $(CHROOT)/boot ; \
 		k=`/bin/ls -1 --sort=time vmlinuz-*|head -n 1` ; \
-		ln -nsf $$k vmlinuz
+		ln -nsf $$k vmlinuz ; \
+	fi
 endif
 	touch kernel