grub2-signing-extension/sbin/grub2-unsign

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#!/bin/bash
# grub2-unsign
# Unsigns every file in /boot. Depends on grub2-verify
# Author: Bandie
# Licence: GNU-GPLv3
# Check if something is wrong
if ! grub2-verify; then
printf '%s\n' "grub2-verify has detected a one or more bad signatures." "Please check for malicious software before you're unsigning everything!" >&2
exit 1
fi
# Then remove the signatures.
find /boot -name '*.sig' -exec rm -- '{}' +
echo "GRUB2 unsigned. WARNING: If you want to deactivate GRUB2's signature feature, change the check_signatures variable in the headers file!"
exit 0