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#!/bin/bash
set -eu -o pipefail
die() {
echo "ERROR: $*" 1>&2
exit 1
}
cleanup() {
umount "$drive" || true
rmdir "$mnt"
}
trap cleanup EXIT
drive="$1"
pubkey="$2"
[ -e "$drive" ] || die "$drive does not exist"
[ -e "$pubkey" ] || die "$pubkey does not exist"
mnt="$(mktemp -d)"
mount "$drive" "$mnt"
if [ ! -e "$mnt/root/.ssh" ]; then
install -d "$mnt/root/.ssh"
fi
authz="$mnt/root/.ssh/authorized_keys"
[ ! -e "$authz" ] || die "$authz already exists"
install -m 0600 "$pubkey" "$authz"
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