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: / etc / needrestart / restart.d /
Filename : systemd-user
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#!/bin/sh

# needrestart - Restart daemons after library updates.
#
# Restarting `systemd --user` by signaling it with SIGRTMIN+25.
# (documented in systemd(1) as equivalent to `systemctl --user daemon-reexec`,
#  but easier to do outside of a user session)
#

# enable xtrace if we should be verbose
if [ "$NR_VERBOSE" = '1' ]; then
    set -x
fi

# also possible to use `--value` (systemd 230+)
systemctl show --state=active --property=MainPID 'user@*.service' | while IFS='=' read -r _ pid; do
    # skip empty lines produced by `systemctl show` if the property
    # did not exist or could not be queried
    if [ -z "$pid" ]; then continue; fi

    # use `env` to suppress the `kill` builtin, which might not know about
    # RT signals (or about _enough_ RT signals, e.g., dash)
    # also possible as: `systemctl kill --kill-whom=main --signal='SIGRTMIN+25' "$unit"` (systemd 252+)
    # also possible as: `systemctl -M "$uid@.host" --user daemon-reexec` (systemd 248+)
    env kill -SIGRTMIN+25 "$pid"
done