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: 48682v19.07.3_mercusys_ac12_duma
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