41 lines
1.8 KiB
Bash
41 lines
1.8 KiB
Bash
#!/bin/bash
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boot_dir='/boot/syslinux'
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boot_dir="${boot_dir%/}"
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# Returns e.g. '/dev/sda1'
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boot_fs="$(findmnt --noheadings --target "${boot_dir}" --output 'SOURCE')" || {
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printf -- '%s\n' \
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'Unable to identify boot drive for '"'${boot_dir}'"' boot dir.' \
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'Cowardly exiting. No syslinux files nor MBR were overwritten.'
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exit 1
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}
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if [[ "$(<<<"${boot_fs}" wc -l)" -gt '1' ]]; then
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printf -- '%s\n' \
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'More than one drive mounted at '"'${boot_dir}'"' boot dir.' \
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'Cowardly exiting. No syslinux files nor MBR were overwritten.'
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exit 1
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fi
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# Returns e.g. 'sda1'. This is the format used when traversing through lsblk
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# JSON output.
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boot_fs_name="$(basename "${boot_fs}")"
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# May return e.g. 'sda' if "${boot_fs}" has a parent.
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boot_disk="$(lsblk --output 'NAME' --json --tree | jq --raw-output '.[][] | select(.children | length > 0) | select(.children[].name=="'"${boot_fs_name}"'") | .name')"
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if [[ ! "${boot_disk}" ]]; then
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# There's no parent drive over "${boot_fs}" meaning "${boot_fs}" itself
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# already is the parent. This is a file system on a drive and not on a
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# partition. We stick to the long-form device name, e.g. '/dev/sda1'.
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boot_disk="${boot_fs}"
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else
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# We found a parent, e.g. 'sda'. In order to work with commands below
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# we'll prefix it with '/dev/'.
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boot_disk='/dev/'"${boot_disk}"
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fi
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find "${boot_dir}" -type f -iname '*.c32' -delete && echo 'Delete old COMBOOT files from boot drive'
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rsync -a '/usr/lib/syslinux/bios/'*'.c32' "${boot_dir}"'/' && echo 'Put new COMBOOT files onto boot drive'
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extlinux --install "${boot_dir}" &>/dev/null && echo 'Install new extlinux boot loader'
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dd bs=440 count=1 conv=notrunc if='/usr/lib/syslinux/bios/mbr.bin' of="${boot_disk}" 2>/dev/null && echo 'Overwrite MBR with newest version'
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