implement rescue mode installation via -r

if you have an alix board and like to have a fallback safemode
system, you can use adkinstall with -r and install a kernel with
initramfs as a read-only never changing rescue image.
Grub will then installed on the same rescue partition on the
compact flash card, to avoid a broken system after grub upgrade.

System should always come up with the rescue system without any
dependency to the live system.

1 files changed, 90 insertions, 22 deletions

diff --git a/package/adkinstall/src/adkinstall b/package/adkinstall/src/adkinstall
index 2ea991928..9faab9391 100644
--- a/package/adkinstall/src/adkinstall
+++ b/package/adkinstall/src/adkinstall
@@ -1,38 +1,88 @@
 #!/bin/sh
 # installs a rootfs tar archive from OpenADK onto a Compact Flash disk
 
+check_exit() {
+        if [ $? -ne 0 ];then
+                echo "Installation failed."
+                exit 1
+        fi
+}
+
+rescue=0
+while getopts "r" option
+do
+	case $option in
+		r)
+			rescue=1
+			;;
+		*)
+			printf "Option not recognized\n"
+			exit 1
+			;;
+	esac
+done
+shift $(($OPTIND - 1))
+
 if [ -z $1 ];then
         printf "Please give your root tar archive as parameter\n"
         exit 1
 fi
-# create empty partition table
+
+if [ $rescue -eq 1 ];then
+	if [ -z $2 ];then
+		printf "Please give your rescue kernel image as second parameter\n"
+		exit 2
+	fi
+	if [ ! -f $2 ];then
+		printf "$2 is not a file, Exiting.\n"
+		exit 1
+	fi
+fi
+
+printf "Creating partitions ...\n"
 parted -s /dev/sda mklabel msdos
+check_exit
 sleep 2
 maxsize=$(env LC_ALL=C parted /dev/sda -s unit cyl print |awk '/^Disk/ { print $3 }'|sed -e 's/cyl//')
 rootsize=$(($maxsize-2))
-parted -s /dev/sda unit cyl mkpartfs primary ext2 0 $rootsize
-parted -s /dev/sda unit cyl mkpart primary fat32 $rootsize $maxsize
-parted -s /dev/sda set 1 boot on
-sfdisk --change-id /dev/sda 2 88 >/dev/null 2>&1
-if [ $? -eq 0 ];then
-        printf "Successfully created partition ${rootpart}\n"
-else
-        printf "Partition creation failed, Exiting.\n"
-        exit 1
+start=0
+rootp=1
+cfgfsp=2
+if [ $rescue -eq 1 ];then
+	rootp=2
+	cfgfsp=3
+	start=2
+	parted -s /dev/sda unit cyl mkpartfs primary ext2 0 $start
+	check_exit
 fi
-mount -t ext2 /dev/sda1 /mnt
-printf "Extracting install archive\n"
+parted -s /dev/sda unit cyl mkpartfs primary ext2 $start $rootsize
+check_exit
+parted -s /dev/sda unit cyl mkpart primary fat32 $rootsize $maxsize
+check_exit
+parted -s /dev/sda set $rootp boot on
+check_exit
+sfdisk --change-id /dev/sda $cfgfsp 88 >/dev/null 2>&1
+check_exit
+# settle down
+sleep 2
+mount -t ext2 /dev/sda$rootp /mnt
+check_exit
+printf "Extracting install archive ...\n"
 tar -C /mnt -xzpf $1
+check_exit
 chmod 1777 /mnt/tmp
 chmod 4755 /mnt/bin/busybox
 
 speed=$(awk -F \, '/console=ttyS0/ { print $2 }' /proc/cmdline|sed -e "s/ .*$//")
 
-printf "Install bootloader\n"
+if [ $rescue -eq 1 ];then
+	umount /mnt
+	mount /dev/sda1 /mnt
+	cp $2 /mnt/rescue
+fi
+printf "Installing bootloader ...\n"
 mkdir -p /mnt/boot/grub
-mount -o bind /dev /mnt/dev
-chroot /mnt mount -t proc /proc /proc
-chroot /mnt mount -t sysfs /sys /sys
+if [ $rescue -eq 1 ];then
 cat << EOF > /mnt/boot/grub/grub.cfg
 set default=0
 set timeout=1
@@ -42,15 +92,33 @@ terminal_input serial
 
 menuentry "GNU/Linux (OpenADK)" {
         insmod ext2
+        set root=(hd0,2)
+        linux /boot/vmlinuz-adk root=/dev/sda$rootp ro init=/init panic=10
+}
+
+menuentry "GNU/Linux (OpenADK) Rescue Mode" {
+        insmod ext2
         set root=(hd0,1)
-        linux /boot/vmlinuz-adk root=/dev/sda1 ro init=/init panic=10
+        linux /rescue ro init=/init panic=10
 }
 EOF
-chroot /mnt grub-install /dev/sda >/dev/null 2>&1
-umount /mnt/proc
-umount /mnt/sys
-umount /mnt/dev
+else
+cat << EOF > /mnt/boot/grub/grub.cfg
+set default=0
+set timeout=1
+serial --unit=0 --speed=$speed
+terminal_output serial 
+terminal_input serial 
 
+menuentry "GNU/Linux (OpenADK)" {
+        insmod ext2
+        set root=(hd0,1)
+        linux /boot/vmlinuz-adk root=/dev/sda$rootp ro init=/init panic=10
+}
+EOF
+fi
+grub-install --root-directory=/mnt /dev/sda 
+check_exit
 umount /mnt
-printf "Successfully installed.\n"
+printf "Successfully installed. You can reboot now.\n"
 exit 0