fix(sys-kernel/coreos-kernel): Don't install firmware to root filesystem

In preparation for moving to using firmware provided by the
linux-firmware repository instead of linux the kernel ebuild needs to
stop installing the files to avoid conflicts. Also to better ensure that
the firmware package gets rebuilt every time the kernel does bump to
EAPI=5 and set the subslot to the ebuild version/revision. The firmware
package can then depend on the kernel w/ a special slot operator to make
sure it gets rebuilt when the kernel version changes. The firmware
package can then scan the installed modules and only install the
firmware that is required.

(Portage automatic rebuild behavior often makes this sort of rebuild
happen anyway but using subslots makes it a strict requirement.)

sdk_container/src/third_party/coreos-overlay/eclass/cros-kernel2.eclass

@@ -1,13 +1,13 @@
 # Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
 # Distributed under the terms of the GNU General Public License v2
 
-[[ ${EAPI} != "4" ]] && die "Only EAPI=4 is supported"
+[[ ${EAPI} != "5" ]] && die "Only EAPI=5 is supported"
 
 inherit cros-workon toolchain-funcs
 
 HOMEPAGE="http://www.chromium.org/"
 LICENSE="GPL-2"
-SLOT="0"
+SLOT="0/${PVR}"
 
 DEPEND="sys-apps/debianutils
 		sys-devel/bc
@@ -195,7 +195,9 @@ cros-kernel2_src_compile() {
 cros-kernel2_src_install() {
 	dodir /boot
 	kmake INSTALL_PATH="${D}/boot" install
-	kmake INSTALL_MOD_PATH="${D}" modules_install
+	# Install firmware to a temporary (bogus) location.
+	# The linux-firmware package will be used instead.
+	kmake INSTALL_MOD_PATH="${D}" INSTALL_FW_PATH="${T}/fw" modules_install
 
 	local version=$(kernelversion)
 	if [ ! -e "${D}/boot/vmlinuz" ]; then

sdk_container/src/third_party/coreos-overlay/sys-kernel/coreos-kernel/coreos-kernel-3.11.7-r6.ebuild

@@ -2,7 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 # $Header: /var/cvsroot/gentoo-x86/sys-kernel/vanilla-sources/vanilla-sources-3.7.5.ebuild,v 1.1 2013/01/28 13:18:54 ago Exp $
 
-EAPI=4
+EAPI=5
 CROS_WORKON_COMMIT="0507eb5ef5a83ab746677b7f19d6e3a19906c995"
 CROS_WORKON_REPO="git://github.com"
 CROS_WORKON_PROJECT="coreos/linux"

sdk_container/src/third_party/coreos-overlay/sys-kernel/coreos-kernel/coreos-kernel-3.12.6-r1.ebuild

@@ -2,7 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 # $Header: /var/cvsroot/gentoo-x86/sys-kernel/vanilla-sources/vanilla-sources-3.7.5.ebuild,v 1.1 2013/01/28 13:18:54 ago Exp $
 
-EAPI=4
+EAPI=5
 CROS_WORKON_COMMIT="2e8b6ebe08210cda2967c63320fc0052de903efa"
 CROS_WORKON_REPO="git://github.com"
 CROS_WORKON_PROJECT="coreos/linux"