wrong systemd location on atomic hosts

[sgohl]

I am using Fedora CoreOS where /usr/lib/systemd is a readonly filesystem.

Hence, the install script fails

curl -o- http://192.168.55.191:12345/serverStatus/clnzoxcy10001vy2ohi4obbi0/install.sh?url=http://192.168.55.191:12345 | sudo bash
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  4185  100  4185    0     0   371k      0 --:--:-- --:--:-- --:--:--  408k
main: line 40: yum: command not found
[Info] Please input server url, press enter use default value(default: http://192.168.55.191:12345)
[Info] Please input workspaceId, press enter use default value(default: clnzoxcy10001vy2ohi4obbi0)
[Info] Downloading amd64 binary file...
WARNING: The certificate is NOT trusted. The certificate issuer is unknown. 
WARNING: The certificate is NOT trusted. The certificate issuer is unknown. 
tianji-reporter-linu 100% [=========================================================================================================================>]   12.06M   59.46MB/s
                          [Files: 1  Bytes: 12.06M [10.04MB/s] Redirects: 2  Todo: 0  Errors: 0                                                      ]
[Info] Write to systemd configuration
main: line 71: /usr/lib/systemd/system/tianji-reporter.service: Read-only file system
Failed to enable unit: Unit file tianji-reporter.service does not exist.
Failed to start tianji-reporter.service: Unit tianji-reporter.service not found.
[Error] Tianji Reporter Start Failed!

If I change line 67 to

service_conf=/etc/systemd/system/tianji-reporter.service

it works and I see the server and metrics in tianji.

I'd like to suggest adding a check whether /usr/lib/systemd is writeable and in case it's not, use /etc/systemd

if [[ -w /usr/lib/systemd ]]
then
  service_conf=/usr/lib/systemd/system/tianji-reporter.service
else
  service_conf=/etc/systemd/system/tianji-reporter.service
fi