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authorJo-Philipp Wich <jow@openwrt.org>2016-02-09 12:33:17 +0000
committerJo-Philipp Wich <jow@openwrt.org>2016-02-09 12:33:17 +0000
commit4aeeead303cda2a85895fde9d3983eae323a30e1 (patch)
tree30856f12366d0b265eb6a8b04825ad8449c52672 /target/linux/x86/base-files
parent6b73b7a8ec744f557200f1b7be0c3018244996d6 (diff)
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x86: preserve partition table on sysupgrade
With this patch sysupgrade will write directly to the partitions instead of to the main disk. The UUID is copied from the image to the MBR as well. This prevents the mbr from being completely overwritten and losing the partition table. The -p option has been added to maintain the original behavior and overwite the entire disk with the new image. Tests have been added to ensure that the image partitions match up with the active partitions. Signed-off-by: Rob Mosher <nyt-openwrt@countercultured.net> SVN-Revision: 48682
Diffstat (limited to 'target/linux/x86/base-files')
-rw-r--r--target/linux/x86/base-files/lib/upgrade/platform.sh51
1 files changed, 49 insertions, 2 deletions
diff --git a/target/linux/x86/base-files/lib/upgrade/platform.sh b/target/linux/x86/base-files/lib/upgrade/platform.sh
index 73ab5ef079..86696aec04 100644
--- a/target/linux/x86/base-files/lib/upgrade/platform.sh
+++ b/target/linux/x86/base-files/lib/upgrade/platform.sh
@@ -55,12 +55,59 @@ platform_copy_config() {
fi
}
+get_partitions() { # <device> <filename>
+ local disk="$1"
+ local filename="$2"
+
+ if [ -b "$disk" -o -f "$disk" ]; then
+ echo "Reading partition table from $filename..."
+ partx -r "$disk" -gbo NR,START,SECTORS > "/tmp/partx.$filename"
+ fi
+}
+
platform_do_upgrade() {
platform_export_bootpart
+ disk="${BOOTPART%[0-9]}"
- if [ -b "${BOOTPART%[0-9]}" ]; then
+ if [ -b "$disk" ]; then
sync
- get_image "$@" | dd of="${BOOTPART%[0-9]}" bs=4096 conv=fsync
+ if [ "$SAVE_PARTITIONS" = "1" ]; then
+ get_partitions "$disk" bootdisk
+
+
+ #get block size
+ sectors="$(partx -r $disk -gbo SECTORS --nr 1:1)"
+ size="$(partx -r $disk -gbo SIZE --nr 1:1)"
+ ibs="$(($size / $sectors))"
+
+ #extract the boot sector from the image
+ get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
+
+ get_partitions /tmp/image.bs image
+
+ #compare tables
+ diff="$(grep -F -x -v -f /tmp/partx.bootdisk /tmp/partx.image)"
+ if [ -n "$diff" ]; then
+ echo "Partition layout is changed. Full image will be written."
+ ask_bool 0 "Abort" && exit
+
+ get_image "$@" | dd of="$disk" 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
+ done < /tmp/partx.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
+ else
+ get_image "$@" | dd of="$disk" bs=4096 conv=fsync
+ fi
+
sleep 1
fi
}