From c527fd1f14c27855a37f2e8ac5346ce8d940ced2 Mon Sep 17 00:00:00 2001
From: Tudor Florea <tudor.florea@enea.com>
Date: Thu, 16 Oct 2014 03:05:19 +0200
Subject: initial commit for Enea Linux 4.0-140929

Migrated from the internal git server on the daisy-enea-point-release branch

Signed-off-by: Tudor Florea <tudor.florea@enea.com>
---
 meta/classes/kernel-grub.bbclass | 91 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 meta/classes/kernel-grub.bbclass

(limited to 'meta/classes/kernel-grub.bbclass')

diff --git a/meta/classes/kernel-grub.bbclass b/meta/classes/kernel-grub.bbclass
new file mode 100644
index 0000000000..85721ffd70
--- /dev/null
+++ b/meta/classes/kernel-grub.bbclass
@@ -0,0 +1,91 @@
+#
+# While installing a rpm to update kernel on a deployed target, it will update
+# the boot area and the boot menu with the kernel as the priority but allow
+# you to fall back to the original kernel as well.
+#
+# - In kernel-image's preinstall scriptlet, it backs up original kernel to avoid
+#   probable confliction with the new one.
+#
+# - In kernel-image's postinstall scriptlet, it modifies grub's config file to
+#   updates the new kernel as the boot priority.
+#
+
+pkg_preinst_kernel-image_append () {
+	# Parsing confliction
+	[ -f "$D/boot/grub/menu.list" ] && grubcfg="$D/boot/grub/menu.list"
+	[ -f "$D/boot/grub/grub.cfg" ] && grubcfg="$D/boot/grub/grub.cfg"
+	if [ -n "$grubcfg" ]; then
+		# Dereference symlink to avoid confliction with new kernel name.
+		if grep -q "/${KERNEL_IMAGETYPE} \+root=" $grubcfg; then
+			if [ -L "$D/boot/${KERNEL_IMAGETYPE}" ]; then
+				kimage=`realpath $D/boot/${KERNEL_IMAGETYPE} 2>/dev/null`
+				if [ -f "$D$kimage" ]; then
+					sed -i "s:${KERNEL_IMAGETYPE} \+root=:${kimage##*/} root=:" $grubcfg
+				fi
+			fi
+		fi
+
+		# Rename old kernel if it conflicts with new kernel name.
+		if grep -q "/${KERNEL_IMAGETYPE}-${KERNEL_VERSION} \+root=" $grubcfg; then
+			if [ -f "$D/boot/${KERNEL_IMAGETYPE}-${KERNEL_VERSION}" ]; then
+				timestamp=`date +%s`
+				kimage="$D/boot/${KERNEL_IMAGETYPE}-${KERNEL_VERSION}-$timestamp-back"
+				sed -i "s:${KERNEL_IMAGETYPE}-${KERNEL_VERSION} \+root=:${kimage##*/} root=:" $grubcfg
+				mv "$D/boot/${KERNEL_IMAGETYPE}-${KERNEL_VERSION}" "$kimage"
+			fi
+		fi
+	fi
+}
+
+pkg_postinst_kernel-image_prepend () {
+	get_new_grub_cfg() {
+		grubcfg="$1"
+		old_image="$2"
+		title="Update ${KERNEL_IMAGETYPE}-${KERNEL_VERSION}-${PV}"
+		if [ "${grubcfg##*/}" = "grub.cfg" ]; then
+			rootfs=`grep " *linux \+[^ ]\+ \+root=" $grubcfg -m 1 | \
+				 sed "s#${old_image}#${old_image%/*}/${KERNEL_IMAGETYPE}-${KERNEL_VERSION}#"`
+
+			echo "menuentry \"$title\" {"
+			echo "    set root=(hd0,1)"
+			echo "$rootfs"
+			echo "}"
+		elif [ "${grubcfg##*/}" = "menu.list" ]; then
+			rootfs=`grep "kernel \+[^ ]\+ \+root=" $grubcfg -m 1 | \
+				 sed "s#${old_image}#${old_image%/*}/${KERNEL_IMAGETYPE}-${KERNEL_VERSION}#"`
+
+			echo "default 0"
+			echo "timeout 30"
+			echo "title $title"
+			echo "root  (hd0,0)"
+			echo "$rootfs"
+		fi
+	}
+
+	get_old_grub_cfg() {
+		grubcfg="$1"
+		if [ "${grubcfg##*/}" = "grub.cfg" ]; then
+			cat "$grubcfg"
+		elif [ "${grubcfg##*/}" = "menu.list" ]; then
+			cat "$grubcfg" | sed -e '/^default/d' -e '/^timeout/d'
+		fi
+	}
+
+	if [ -f "$D/boot/grub/grub.cfg" ]; then
+		grubcfg="$D/boot/grub/grub.cfg"
+		old_image=`grep ' *linux \+[^ ]\+ \+root=' -m 1 "$grubcfg" | awk '{print $2}'`
+	elif [ -f "$D/boot/grub/menu.list" ]; then
+		grubcfg="$D/boot/grub/menu.list"
+		old_image=`grep '^kernel \+[^ ]\+ \+root=' -m 1 "$grubcfg" | awk '{print $2}'`
+	fi
+
+	# Don't update grubcfg at first install while old bzImage doesn't exist.
+	if [ -f "$D/boot/${old_image##*/}" ]; then
+		grubcfgtmp="$grubcfg.tmp"
+		get_new_grub_cfg "$grubcfg" "$old_image"  > $grubcfgtmp
+		get_old_grub_cfg "$grubcfg" >> $grubcfgtmp
+		mv $grubcfgtmp $grubcfg
+		echo "Caution! Update kernel may affect kernel-module!"
+	fi
+}
+
-- 
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