mirror of
https://github.com/gensokyo-zone/infrastructure.git
synced 2026-02-09 12:29:19 -08:00
46 lines
1.2 KiB
Nix
46 lines
1.2 KiB
Nix
{ pkgs, writeShellScriptBin }:
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writeShellScriptBin "disk-mapper-part" ''
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set -x
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DISK=$1
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DM_NAME=$(basename $DISK)
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if [[ ! -e /dev/mapper/$DM_NAME ]]; then
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DISK_ID=''${2-$(printf %s "$DM_NAME" | sha256sum)}
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DISK_TYPE=7 # NTFS
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MBR_FILE=$(mktemp -t vm-$DM_NAME-XXXXXXXX.mbr)
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BLOCK=$(basename $(readlink $DISK))
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BLOCK_START=$(cat /sys/class/block/$BLOCK/start)
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BLOCK_SIZE=$(cat /sys/class/block/$BLOCK/size)
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DISK_SIZE=$(((BLOCK_SIZE + 2048 + 2047) / 2048 * 2048))
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dd if=/dev/zero of=$MBR_FILE bs=512 count=2048 status=none
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LDEV=$(losetup --show -f $MBR_FILE)
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END_GUARD=$((DISK_SIZE - 2048 - BLOCK_SIZE))
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if [[ $END_GUARD -ne 0 ]]; then
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END_GUARD="$((BLOCK_SIZE + 2048)) $END_GUARD zero"
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else
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END_GUARD=
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fi
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dmsetup create $DM_NAME <<EOF
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0 2048 linear $LDEV 0
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2048 $BLOCK_SIZE linear $DISK 0
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$END_GUARD
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EOF
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CYL=$((DISK_SIZE / 2048))
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if [[ $CYL -gt 65535 ]]; then
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CYL=65535
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fi
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dmsetup setgeometry $DM_NAME $CYL 64 32 0
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chown "$USER" /dev/mapper/$DM_NAME
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sfdisk --quiet --no-tell-kernel --no-reread /dev/mapper/$DM_NAME <<EOF
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label: dos
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label-id: 0x''${DISK_ID:8}
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device: $DM_NAME
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unit: sectors
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grain: 512
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sector-size: 512
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1 : start=2048, size=$BLOCK_SIZE, type=$DISK_TYPE
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EOF
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fi
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''
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