systemd[1]: [/usr/lib/systemd/system/sssd-ifp.service:9]
    Path '-@environment_file@' is not absolute, ignoring.

sh-4.2# systemctl cat sssd-ifp.service
 # /usr/lib/systemd/system/sssd-ifp.service
[Unit]
Description=SSSD IFP Service responder
Documentation=man:sssd-ifp(5)
After=sssd.service
BindsTo=sssd.service

[Service]
Environment=DEBUG_LOGGER=--logger=files
EnvironmentFile=-@environment_file@
Type=dbus
BusName=org.freedesktop.sssd.infopipe
ExecStart=/usr/libexec/sssd/sssd_ifp --uid 0 --gid 0 --dbus-activated ${DEBUG_LOGGER}

Resolves:
https://pagure.io/SSSD/sssd/issue/3433

SSSD can cleanup pid file in case of standard stopping of daemon.
It's done in function monitor_cleanup. However monitor does not have a
change to cleanup file in case of OOM or sending SIGKILL to monitor.

Even though PIDFile is not necessary for services with Type notify
we should let systemd to clean this file in unexpected situations.

Resolves:
https://pagure.io/SSSD/sssd/issue/3528

Variables debug_to_file or debug_to_stderr were not set
because back-end already user parameter --logger=%s.
And therefore logs were not sent to files.

It could only work in case of direct usage of --debug-to-files in back-end via
command configuration option.

Resolves:
https://pagure.io/SSSD/sssd/issue/3433