By returning early when no upgrade device can be found and handling the
SAVE_PARTITIONS=0 case differently, we can get rid of two levels of if.
Signed-off-by: Matthias Schiffer <mschif...@universe-factory.net>
---
.../linux/x86/base-files/lib/upgrade/platform.sh | 69 +++++++++++-----------
1 file changed, 36 insertions(+), 33 deletions(-)
diff --git a/target/linux/x86/base-files/lib/upgrade/platform.sh
b/target/linux/x86/base-files/lib/upgrade/platform.sh
index 81b349a818..4fa71999be 100644
--- a/target/linux/x86/base-files/lib/upgrade/platform.sh
+++ b/target/linux/x86/base-files/lib/upgrade/platform.sh
@@ -47,40 +47,43 @@ platform_copy_config() {
platform_do_upgrade() {
local diskdev partdev diff
- if export_bootdevice && export_partdevice diskdev 0; then
- sync
- if [ "$SAVE_PARTITIONS" = "1" ]; then
- get_partitions "/dev/$diskdev" bootdisk
-
- #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/partmap.bootdisk
/tmp/partmap.image)"
- if [ -n "$diff" ]; then
- get_image "$@" | 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
- if export_partdevice partdev $part; then
- echo "Writing image to /dev/$partdev..."
- get_image "$@" | dd of="/dev/$partdev"
ibs="512" obs=1M skip="$start" count="$size" conv=fsync
- else
- echo "Unable to find partition $part
device, skipped."
- fi
- done < /tmp/partmap.image
-
- #copy partition uuid
- echo "Writing new UUID to /dev/$diskdev..."
- get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440
count=4 seek=440 conv=fsync
+ export_bootdevice && export_partdevice diskdev 0 || {
+ echo "Unable to determine upgrade device"
+ return 1
+ }
+
+ sync
+
+ if [ "$SAVE_PARTITIONS" = "1" ]; then
+ get_partitions "/dev/$diskdev" bootdisk
+
+ #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/partmap.bootdisk
/tmp/partmap.image)"
+ else
+ diff=1
+ fi
+
+ if [ -n "$diff" ]; then
+ get_image "$@" | 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
+ if export_partdevice partdev $part; then
+ echo "Writing image to /dev/$partdev..."
+ get_image "$@" | dd of="/dev/$partdev" ibs="512" obs=1M
skip="$start" count="$size" conv=fsync
else
- get_image "$@" | dd of="/dev/$diskdev" bs=4096
conv=fsync
+ echo "Unable to find partition $part device, skipped."
fi
+ done < /tmp/partmap.image
- sleep 1
- fi
+ #copy partition uuid
+ echo "Writing new UUID to /dev/$diskdev..."
+ get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440
conv=fsync
}
--
2.13.0
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