x86: make sysupgrade work without partx

[openwrt.git] / target / linux / x86 / base-files / lib / upgrade / platform.sh

diff --git a/target/linux/x86/base-files/lib/upgrade/platform.sh b/target/linux/x86/base-files/lib/upgrade/platform.sh
index c21f1a7..f12deeb 100644 (file)
--- a/target/linux/x86/base-files/lib/upgrade/platform.sh
+++ b/target/linux/x86/base-files/lib/upgrade/platform.sh
@@ -61,7 +61,27 @@ get_partitions() { # <device> <filename>
 
        if [ -b "$disk" -o -f "$disk" ]; then
                echo "Reading partition table from $filename..."
-               partx -r "$disk" -gbo NR,START,SECTORS > "/tmp/partx.$filename"
+
+               local magic="$(hexdump -v -n 2 -s 0x1FE -e '1/2 "0x%04X"' "$disk")"
+               if [ "$magic" != 0xAA55 ]; then
+                       echo "Invalid partition table on $disk"
+                       exit
+               fi
+
+               rm -f "/tmp/partmap.$filename"
+
+               local part
+               for part in 1 2 3 4; do
+                       set -- $(hexdump -v -n 12 -s "$((0x1B2 + $part * 16))" -e '3/4 "0x%08X "' "$disk")
+
+                       local type="$(($1 % 256))"
+                       local lba="$(($2))"
+                       local num="$(($3))"
+
+                       [ $type -gt 0 ] || continue
+
+                       printf "%2d %5d %7d\n" $part $lba $num >> "/tmp/partmap.$filename"
+               done
        fi
 }
 
@@ -76,9 +96,11 @@ platform_do_upgrade() {
 
 
                        #get block size
-                       sectors="$(partx -r $disk -gbo SECTORS --nr 1:1)"
-                       size="$(partx -r $disk -gbo SIZE --nr 1:1)"
-                       ibs="$(($size / $sectors))"
+                       if [ -f "/sys/block/${disk##*/}/queue/physical_block_size" ]; then
+                               ibs="$(cat "/sys/block/${disk##*/}/queue/physical_block_size")"
+                       else
+                               ibs=512
+                       fi
 
                        #extract the boot sector from the image
                        get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
@@ -86,7 +108,7 @@ platform_do_upgrade() {
                        get_partitions /tmp/image.bs image
 
                        #compare tables
-                       diff="$(grep -F -x -v -f /tmp/partx.bootdisk /tmp/partx.image)"
+                       diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
                        if [ -n "$diff" ]; then
                                echo "Partition layout is changed.  Full image will be written."
                                ask_bool 0 "Abort" && exit
@@ -99,7 +121,7 @@ platform_do_upgrade() {
                        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
+                       done < /tmp/partmap.image
 
                        #copy partition uuid
                        echo "Writing new UUID to $disk$part..."