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[devices]: Zero out 1st MB before repartitioning #5220

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Aug 23, 2020
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[devices]: Zero out 1st MB before repartitioning #5220

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3 changes: 3 additions & 0 deletions files/initramfs-tools/arista-convertfs.j2
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Original file line number Diff line number Diff line change
Expand Up @@ -213,6 +213,9 @@ umount "$root_mnt"

if [ $(echo -n "$root_dev" | tail -c 1) == "1" ]; then
# Create a new partition table (content in flash_dev will be deleted)
err_msg="Error: Failed to zero out first MB"
cmd="dd if=/dev/zero of=$flash_dev bs=512 count=2048"
run_cmd "$cmd" "$err_msg"
err_msg="Error: repartitioning $flash_dev failed"
cmd="echo '2048' | sfdisk $flash_dev || (sleep 3; blockdev --rereadpt $flash_dev && fdisk -l $flash_dev | grep -q ${root_dev}.*Linux)"
run_cmd "$cmd" "$err_msg"
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