systemd prepending /bin to Environment PATH

Question

I'm trying to setup my Bamboo agents as a systemd service. The service file looks like this:

[Unit]
Description=Atlassian Bamboo Agent
After=syslog.target network.target

[Service]
Type=forking
User=bamboo
Group=bamboo
ExecStart=/opt/bamboo-1/bin/bamboo-agent.sh start
ExecStop=/opt/bamboo-1/bin/bamboo-agent.sh stop
Environment="PATH=/opt/rh/devtoolset-3/root/bin/:/usr/local/bin:/usr/bin"

[Install]
WantedBy=multi-user.target

When I check the process environment, the PATH is correctly set to what I expect, with with the only exception that my PATH is prepended with /bin.

cat /proc/12345/environ <--- 12345 is my Bamboo PID
...
PATH=/bin:/opt/rh/devtoolset-3/root/bin/:/usr/local/bin:/usr/bin
...

That means my builds will use the wrong gcc, cmake, etc.

Is there any way to prevent /bin to be prepended to the PATH?

Answer 1

I created a test service that just printed out the path after setting Environment= with a new path, and found it worked as expected on Ubuntu 16.04 with systemd 229.

I conclude that something in your script is pre-pending /bin to your environment.

Nothing in the systemd.exec man page suggests that systemd is designed to behave the way you observe.