Systemd env.conf generation using profile.d

example.sh

sudo mkdir -p /etc/systemd/system/user@${UID}.service.d/
./generate-systemd-envconf-from-profile.sh | sudo tee /etc/systemd/system/user@${UID}.service.d/env.conf

generate-systemd-envconf-from-profile.sh

#!/bin/sh
if [ -z "$EXPORTING" ]
then
	# This hack is used to clear the environment to bare minimum.
	env -i EXPORTING=1 HOME=$HOME $0
	exit
fi

BEFORE=$(mktemp)
AFTER=$(mktemp)

# Store the environment variables before we load profile
env > $BEFORE
export DISPLAY=:0
source /etc/profile
source $HOME/.profile

# Store the environment variables after we have loaded profile
env > $AFTER


#echo .include /usr/lib/systemd/system/user@.service
echo [Service]

# Use the difference of the 2 stored environment variables
# Extract the added (or modified) lines: the ones that are only in $AFTER
# Put it in the Systemd-form: Environment="NAME=VALUE"
diff $BEFORE $AFTER | grep '^>' | sed 's/^> \(.*\)=\(.*\)$/Environment="\1=\2"/g'