diskimage-builder/elements/local-config/install.d/62-ssh-key

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#!/bin/bash
# Save user SSH public key if available.
# XXX: Obviously not suitable for downloadable images.
set -eu
set -o pipefail
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if [ -e "/tmp/in_target.d/ssh-authorized-keys" ]; then
mkdir -p /root/.ssh
cat /tmp/in_target.d/ssh-authorized-keys >> /root/.ssh/authorized_keys
chmod 0700 /root/.ssh
chmod 0600 /root/.ssh/authorized_keys
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fi