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31 lines
764 B
31 lines
764 B
#!/usr/bin/env bash
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set -e
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# This assumes that /proc/cmdline contains a cryptdevice with a UUID identifier,
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# like:
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#
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# cryptdevice=UUID=1ff1d6f7-7540-4500-8011-1abe1e9ac00d:cryptroot
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uuid=$(cat /proc/cmdline | \
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tr ' ' '\n' | \
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grep cryptdevice | \
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cut -d= -f3 | \
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cut -d: -f1)
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device=$(lsblk -o PATH,UUID | grep "$uuid" | awk '{print $1}')
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echo "Root device is $device"
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echo -n "Enter root key: "
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read -s pw
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echo ""
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# This will check if the key is right, and cause the process to exit if not due
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# to the "set -e"
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echo "Checking key..."
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echo "$pw" | sudo cryptsetup open --test-passphrase "$device"
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echo "Good job, writing /boot/keyfile..."
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echo -n "$pw" | sudo tee /boot/keyfile >/dev/null
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echo "Shutting down..."
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sudo systemctl poweroff
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