releases/portage/isos: add genkernel patch for ppc64

since it's still not fixed in genkernel, we can carry a
local patch.

patch is conditional for ppc64 only, it will affect only ppc64le
iso for now. ppc64 installcd is ppc, not ppc64.

Bug: https://bugs.gentoo.org/796272
Signed-off-by: Georgy Yakovlev <gyakovlev@gentoo.org>

releases/portage/isos/env/sys-kernel/genkernel

@@ -0,0 +1,35 @@
+post_src_unpack() {
+	if use ppc64; then
+		einfo "hooked by ${BASH_SOURCE[0]} in ${FUNCNAME[0]}"
+		local patchfile
+		patchfile="${PORTAGE_CONFIGROOT%/}/etc/portage/patches/genkernel-ppc64-iso.patch"
+		if [[ -f ${patchfile} ]]; then
+			einfo "found genkernel patch for bug https://bugs.gentoo.org/796272"
+			cd "${S}" || die
+			eapply "${patchfile}"
+		else
+			ewarn "no genkernel patch found, skipping hook"
+		fi
+	fi
+}
+
+post_pkg_postinst() {
+	einfo "hooked by ${BASH_SOURCE[0]} in ${FUNCNAME[0]}"
+	einfo "cleaning up bug https://bugs.gentoo.org/796272 workarounds"
+	# cleanup after ourselves, we don't want workarounds shipped to users
+	# and don't want updating all the spec files with new removal directives.
+	local envfile patchfile
+	envfile="${PORTAGE_CONFIGROOT%/}/etc/portage/env/sys-kernel/genkernel"
+	patchfile="${PORTAGE_CONFIGROOT%/}/etc/portage/patches/genkernel-ppc64-iso.patch"
+	
+	local _x
+	for _x in "${envfile}" "${patchfile}"; do
+		if [[ -f ${_x} ]]; then
+			rm -vf "${_x}"
+		fi
+	done
+	rmdir -v --ignore-fail-on-non-empty "${PORTAGE_CONFIGROOT%/}/etc/portage/env/sys-kernel"
+	rmdir -v --ignore-fail-on-non-empty "${PORTAGE_CONFIGROOT%/}/etc/portage/env"
+	rmdir -v --ignore-fail-on-non-empty "${PORTAGE_CONFIGROOT%/}/etc/portage/patches"
+}
+	

releases/portage/isos/patches/genkernel-ppc64-iso.patch

@@ -0,0 +1,47 @@
+From 628e1a30b384a900cf7095cf86441fed7a0300dc Mon Sep 17 00:00:00 2001
+From: Georgy Yakovlev <gyakovlev@gentoo.org>
+Date: Fri, 14 May 2021 22:05:33 -0700
+Subject: [PATCH] defaults/initrd.scripts: don't skip top level devices with
+ partitions
+
+ppc64 media should be mounted as /dev/sdX, not as /dev/sdX1
+this loop was skipping /dev/sdX if /dev/sdX1 is present.
+
+Bug: https://bugs.gentoo.org/796272
+Signed-off-by: Georgy Yakovlev <gyakovlev@gentoo.org>
+---
+ defaults/initrd.scripts | 18 ------------------
+ 1 file changed, 18 deletions(-)
+
+diff --git a/defaults/initrd.scripts b/defaults/initrd.scripts
+index 5ec8adb..bfc36cf 100644
+--- a/defaults/initrd.scripts
++++ b/defaults/initrd.scripts
+@@ -178,24 +178,6 @@ findmediamount() {
+ 			# Check for a block device to mount
+ 			if [ -b "${x}" ]
+ 			then
+-				skip=0
+-				bsn=$(basename "${x}")
+-				#
+-				# If disk and it has at least one partition, skip.
+-				# We use /sys/block/${bsn}/${bsn}[0-9]* to make sure that we
+-				# don't skip device mapper devices. Even the craziest scenario
+-				# deserves a fair chance.
+-				#
+-				# shellcheck disable=SC2045
+-				for part in $(ls /sys/block/${bsn}/${bsn}*[0-9]* 2>/dev/null)
+-				do
+-					skip=1
+-					break;
+-				done
+-				if [ ${skip} -eq 1 ]
+-				then
+-					continue
+-				fi
+ 				good_msg "Attempting to mount media: ${x}" ${CRYPT_SILENT}
+ 
+ 				CDROOT_TYPE=$(determine_fs "${x}" "${CDROOT_TYPE}")
+-- 
+2.31.1
+