[Solved] Overriding systemd Unit Files Isn't Working

I'm trying to set up some custom dependencies for various services, some of which are supported packages, some are custom packages I've developed. I am running into problems following the procedure described here - specifically, service files in /etc/systemd/system are ignored, and the only way to override them is to edit the files in /usr/lib/systemd/system. I have verified this issue on both a VPS instance and my desktop. Both systems were originally built well before systemd and have been converted to pure systemd systems. Does anyone else see these issues, or know of any reason this would be happening and/or how to resolve it?
Steps to reproduce. This example uses httpd and mysql, but I've tested it with several other services, always with the same results:
Enable the service unit and create a new override:
systemctl enable httpd.service
rm /etc/systemd/system/multi-user.target.wants/httpd.service
cp /usr/lib/systemd/system/httpd.service /etc/systemd/system/multi-user.target.wants/httpd.service
Edit /etc/systemd/system/multi-user.target.wants/httpd.service, adding a line 'Wants=mysqld.service' to the [Unit] section.
Make systemd changes effective, and verify them. The first command results in an error that says "Failed to issue method call: Invalid argument". The final command will show an empty list ("Wants="), when it should list mysqld. Running systemd-delta also shows no override.
systemctl reenable httpd
systemctl daemon-reload
systemctl show -p "Wants" httpd.service
Change the replacement unit file to .include the packaged unit file:
cat > /etc/systemd/system/multi-user.target.wants/httpd.service << __EOF
.include /usr/lib/systemd/system/httpd.service
[Unit]
Wants=mysqld.service
__EOF
Repeat step #3, with the same results
Reenable the package's unit:
rm /etc/systemd/system/multi-user.target.wants/httpd.service
systemctl enable httpd.service
Edit the original unit file in /usr/lib/systemd/system/httpd.service, adding the 'Wants=myslqd.service' to the Unit section
Repeat step 3
Result is the correct and expected one this time ("Wants=myslqd.service")
Last edited by dwheeler (2012-11-14 19:53:10)

Well...
I'm still having problems with .service custom files!
I want to customize the ExecStart from original cronie.service file, like this:
# cat /etc/systemd/system/cronie.service
.include /usr/lib/systemd/system/cronie.service
[Service]
ExecStart=/usr/sbin/crond -n -s -m off
==============================
# systemctl restart cronie.service
Failed to issue method call: Unit cronie.service failed to load: Invalid argument. See system logs and 'systemctl status cronie.service' for details.
==============================
# systemd-delta
[OVERRIDDEN] /etc/systemd/system/cronie.service → /usr/lib/systemd/system/cronie.service
--- /usr/lib/systemd/system/cronie.service 2012-11-22 20:04:00.000000000 -0200
+++ /etc/systemd/system/cronie.service 2012-11-27 16:09:49.944085437 -0200
@@ -1,10 +1,3 @@
-[Unit]
-Description=Periodic Command Scheduler
+.include /usr/lib/systemd/system/cronie.service
[Service]
-ExecStart=/usr/sbin/crond -n
-ExecReload=/bin/kill -HUP $MAINPID
-Restart=always
-[Install]
-WantedBy=multi-user.target
+ExecStart=/usr/sbin/crond -n -s -m off
==============================
# systemctl status cronie.service
cronie.service - Periodic Command Scheduler
Loaded: error (Reason: Invalid argument)
Active: inactive (dead)
CGroup: name=systemd:/system/cronie.service
Nov 27 13:52:59 xpto systemd[1]: Starting Periodic Command Scheduler...
Nov 27 13:52:59 xpto systemd[1]: Started Periodic Command Scheduler.
Nov 27 13:52:59 xpto /usr/sbin/crond[309]: (CRON) INFO (running with inotify support)
Nov 27 14:01:01 xpto /usr/sbin/crond[8216]: pam_unix(crond:session): session opened for user root by (uid=0)
Nov 27 14:01:01 xpto /USR/SBIN/CROND[8217]: (root) CMD (run-parts /etc/cron.hourly)
==============================
What am I doing wrong?
Thanks in advance.

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