Automatic eCryptFS Mounting for systemd.

mountecryptfs.service

[Unit]
After = etc-ecryptfs.mount
Description = Mount eCryptFS Directories

[Service]
ExecStart = /usr/local/bin/mountecryptfs.sh
KeyringMode = shared
Type = oneshot
User = root

[Install]
WantedBy = local-fs.target

mountecryptfs.sh

#! /usr/bin/env bash

for fekKey in "/etc/ecryptfs/"*".key"; do
	if [[ $fekKey != *.fnek.key ]]; then
		cat "$fekKey" | ecryptfs-add-passphrase -
		fnekKey="$(dirname "$fekKey")/$(basename "$fekKey" .key).fnek.key"
		if [[ -f $fnekKey ]]; then
			cat "$fnekKey" | ecryptfs-add-passphrase -
		fi
		mount -i "/$(systemd-escape -u "$(basename "$fekKey" .key)")"
	fi
done