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authorJo-Philipp Wich <jo@mein.io>2016-05-24 12:07:02 +0200
committerJo-Philipp Wich <jo@mein.io>2016-05-24 13:30:58 +0200
commit1012701014bd944197031a3c0023527861b521b4 (patch)
tree6ef4087afd0ce664dba35e75376526152075b4e1 /target/linux/x86/base-files/lib/upgrade
parent3193053df7d27bde82fbcc310e4404cc43f39313 (diff)
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x86: generalize partition discovery for sysupgrade
Generalize the partition discovery in sysupgrade in order to fix sysupgrade and config backup/recovery on MMC block devices which use a different naming scheme compared to mtdblock or sd* devices. The change also adds the find applet to the ramdisk utilities so that upgrade code can rely on it. The commit is based on the initial submission by Russell Senior at http://patchwork.ozlabs.org/patch/625440/ . Signed-off-by: Russell Senior <russell@personaltelco.net> Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Diffstat (limited to 'target/linux/x86/base-files/lib/upgrade')
-rw-r--r--target/linux/x86/base-files/lib/upgrade/platform.sh73
1 files changed, 50 insertions, 23 deletions
diff --git a/target/linux/x86/base-files/lib/upgrade/platform.sh b/target/linux/x86/base-files/lib/upgrade/platform.sh
index 29eac77dfb..c8bc3f7f60 100644
--- a/target/linux/x86/base-files/lib/upgrade/platform.sh
+++ b/target/linux/x86/base-files/lib/upgrade/platform.sh
@@ -1,5 +1,21 @@
-platform_export_bootpart() {
- local cmdline uuid disk
+platform_export_partdevice() {
+ local var="$1" offset="$2"
+ local uevent MAJOR MINOR DEVNAME DEVTYPE
+
+ for uevent in /sys/class/block/*/uevent; do
+ . "$uevent"
+ if [ $BOOTDEV_MAJOR = $MAJOR -a $(($BOOTDEV_MINOR + $offset)) = $MINOR -a -b "/dev/$DEVNAME" ]; then
+ export "$var=$DEVNAME"
+ return 0
+ fi
+ done
+
+ return 1
+}
+
+platform_export_bootdevice() {
+ local cmdline uuid disk uevent
+ local MAJOR MINOR DEVNAME DEVTYPE
if read cmdline < /proc/cmdline; then
case "$cmdline" in
@@ -17,20 +33,27 @@ platform_export_bootpart() {
PARTUUID=[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-02)
uuid="${disk#PARTUUID=}"
uuid="${uuid%-02}"
- for disk in /dev/*; do
- [ -b "$disk" ] || continue
+ for disk in $(find /dev -type b); do
set -- $(dd if=$disk bs=1 skip=440 count=4 2>/dev/null | hexdump -v -e '4/1 "%02x "')
if [ "$4$3$2$1" = "$uuid" ]; then
- export BOOTPART="${disk}1"
- return 0
+ uevent="/sys/class/block/${disk##*/}/uevent"
+ break
fi
done
;;
/dev/*)
- export BOOTPART="${disk%[0-9]}1"
- return 0
+ uevent="/sys/class/block/${disk##*/}/uevent"
;;
esac
+
+ if [ -e "$uevent" ]; then
+ . "$uevent"
+
+ export BOOTDEV_MAJOR=$MAJOR
+ export BOOTDEV_MINOR=$MINOR
+
+ return 0
+ fi
fi
return 1
@@ -49,8 +72,10 @@ platform_check_image() {
}
platform_copy_config() {
- if [ -b "$BOOTPART" ]; then
- mount -t ext4 -o rw,noatime "$BOOTPART" /mnt
+ local partdev
+
+ if platform_export_partdevice partdev 1; then
+ mount -t ext4 -o rw,noatime "/dev/$partdev" /mnt
cp -af "$CONF_TAR" /mnt/
umount /mnt
fi
@@ -87,18 +112,16 @@ get_partitions() { # <device> <filename>
}
platform_do_upgrade() {
- platform_export_bootpart
- disk="${BOOTPART%[0-9]}"
+ local diskdev partdev ibs diff
- if [ -b "$disk" ]; then
+ if platform_export_bootdevice && platform_export_partdevice diskdev 0; then
sync
if [ "$SAVE_PARTITIONS" = "1" ]; then
- get_partitions "$disk" bootdisk
-
+ get_partitions "/dev/$diskdev" bootdisk
#get block size
- if [ -f "/sys/block/${disk##*/}/queue/physical_block_size" ]; then
- ibs="$(cat "/sys/block/${disk##*/}/queue/physical_block_size")"
+ if [ -f "/sys/block/$diskdev/queue/physical_block_size" ]; then
+ ibs="$(cat "/sys/block/$diskdev/queue/physical_block_size")"
else
ibs=512
fi
@@ -114,21 +137,25 @@ platform_do_upgrade() {
echo "Partition layout is changed. Full image will be written."
ask_bool 0 "Abort" && exit
- get_image "$@" | dd of="$disk" bs=4096 conv=fsync
+ get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
return 0
fi
#iterate over each partition from the image and write it to the boot disk
while read part start size; do
- echo "Writing image to $disk$part..."
- get_image "$@" | dd of="$disk$part" ibs="$ibs" obs=1M skip="$start" count="$size" conv=fsync
+ if platform_export_partdevice partdev $part; then
+ echo "Writing image to /dev/$partdev..."
+ get_image "$@" | dd of="/dev/$partdev" ibs="$ibs" obs=1M skip="$start" count="$size" conv=fsync
+ else
+ echo "Unable to find partition $part device, skipped."
+ fi
done < /tmp/partmap.image
#copy partition uuid
- echo "Writing new UUID to $disk$part..."
- get_image "$@" | dd of="$disk" bs=1 skip=440 count=4 seek=440 conv=fsync
+ echo "Writing new UUID to /dev/$diskdev..."
+ get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
else
- get_image "$@" | dd of="$disk" bs=4096 conv=fsync
+ get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
fi
sleep 1