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os-helpers-fs: add function to erase disks #3574

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Dec 5, 2024
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os-helpers-fs: add function to erase disks #3574

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19 changes: 19 additions & 0 deletions meta-balena-common/recipes-support/os-helpers/os-helpers/os-helpers-fs
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Original file line number Diff line number Diff line change
Expand Up @@ -467,3 +467,22 @@ split_bootpartition() {

# Do not umount - flasher script will still copy configuration files
}

erase_disk() {
tdisk="${1}"
info "Erasing disk ${tdisk}"
_sector_size=$(lsblk -nlbo NAME,PHY-SEC,TYPE "/dev/${tdisk}" | grep disk | awk '{print $2}')
_size=$(lsblk -nlbo NAME,SIZE,TYPE "/dev/${tdisk}" | grep disk | awk '{print $2}')
_size_in_sectors=$( expr ${_size} / ${_sector_size} )
# Overwrite default LUKS2 header size of 16 MiB
_erased_sectors=$( expr 16 \* 1024 \* 1024 / ${_sector_size} )
# Erase the first sectors in each partition
for _ss in $(parted "/dev/${tdisk}" unit s print | awk '/^[ 0-9]/ {sub("s", ""); print $2}'); do
dd if=/dev/urandom of="/dev/${tdisk}" bs="${_sector_size}" count="${_erased_sectors}" seek="${_ss}" conv=sync
done
# Erase partition table
# GPT reserves 34 sector at the start of disk and end of disk as backup
GPT_RESERVED_LBA=34
dd if=/dev/urandom of="/dev/${tdisk}" bs="${_sector_size}" count="${GPT_RESERVED_LBA}" conv=sync
dd if=/dev/urandom of="/dev/${tdisk}" bs="${_sector_size}" seek="$(expr "${_size_in_sectors}" - "${GPT_RESERVED_LBA}" )" count="${GPT_RESERVED_LBA}" conv=sync
}
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