Linux systemd user service | head | fresh synthetic T3 home
$ t3 service install --base-dir $PROOF/account/head
Service installed · t3@0.1.8
Log: $PROOF/account/head/userdata/logs/boot-service.log
Run `t3 up` to choose how your other devices reach it.
Runtime A (0.1.8) is serving HTTP.
$ client RPC server.updateServer targetVersion=0.1.9
{"_tag":"Exit","requestId":"1","exit":{"_tag":"Success","value":{"targetVersion":"0.1.9","method":"boot-service","updateId":"f032ddce-4257-4e23-a75e-ef66a57b780d"}}}
Selected runtime is serving HTTP: 0.1.9
{
  "protocol": 4,
  "activeVersion": "0.1.9",
  "update": {
    "id": "f032ddce-4257-4e23-a75e-ef66a57b780d",
    "fromVersion": "0.1.8",
    "targetVersion": "0.1.9",
    "status": "committed"
  }
}
$ systemctl --user cat t3code.service | select ExecStart
ExecStart=$PROOF/account/head/runtime/versions/0.1.9/t3 __service-launcher
$ client RPC server.updateServer targetVersion=0.1.10
{"_tag":"Exit","requestId":"1","exit":{"_tag":"Success","value":{"targetVersion":"0.1.10","method":"boot-service","updateId":"18867465-fb6d-4bb1-9bed-6dba8807bf49"}}}
Selected runtime is serving HTTP: 0.1.10
{
  "protocol": 4,
  "activeVersion": "0.1.10",
  "update": {
    "id": "18867465-fb6d-4bb1-9bed-6dba8807bf49",
    "fromVersion": "0.1.9",
    "targetVersion": "0.1.10",
    "status": "committed"
  }
}
$ systemctl --user cat t3code.service | select ExecStart
ExecStart=$PROOF/account/head/runtime/versions/0.1.10/t3 __service-launcher
$ remove only runtime A (0.1.8), then systemctl --user restart t3code.service
Removed runtime A.

$ systemctl --user show t3code.service --property=ActiveState,SubState,ExecMainStatus,Result
Result=success
ExecMainStatus=0
ActiveState=active
SubState=running
Restart result: runtime C (0.1.10) serves HTTP successfully.

Removed "$PROOF/account/.config/systemd/user/default.target.wants/t3code.service".
Stopped and disabled disposable service.