Variable expansion not working with mutations

[ygersie]

Nomad v0.3.2
Consul v0.6.4
Description: Ubuntu 14.04.4 LTS

I have a simple test job specification running a python web server. The service gets registered in Consul including a script health check. This works flawless except for variable expansion during "updates".
When I change the group count and perform nomad run web.nomad I get a service health check in Consul looking like this:

{
    "a4dfbee8062f8fc7be3fe2200c2c23810671b5e5": {
        "Node": "nomad",
        "CheckID": "a4dfbee8062f8fc7be3fe2200c2c23810671b5e5",
        "Name": "check_http_800${NOMAD_ALLOC_INDEX}",
        "ServiceName": "webservice",
        "Notes": "",
        "ModifyIndex": 0,
        "Status": "critical",
        "ServiceID": "nomad-registered-service-cd0c8730-75fa-3f3d-7aff-8f0a039cc3d1-web001-b5457a5a7acdb01c65b3afa23ffa66d0891b691b",
        "Output": "FAIL\n",
        "CreateIndex": 0
    }
}

The expansion of ${NOMAD_ALLOC_INDEX} (and probably other variables) doesn't happen for either the service name in consul and the actual command + args of that service (again, only during updates, the initial job run is doing it correctly).

Job file:

job "web" {
    region = "global"
    datacenters = ["dc1"]
    type = "service"
    priority = 50

    constraint {
        attribute = "${attr.kernel.name}"
        value = "linux"
    }

    update {
        # Stagger updates every 30 seconds
        stagger = "30s"

        # Update a single task at a time
        max_parallel = 1
    }

    group "webservers" {
        count = 1

        restart {
            attempts = 10
            interval = "1m"
            delay = "5s"
            mode = "fail"
        }

        task "web001" {
            driver = "exec"

            config {
                command = "/usr/bin/python"
                args = ["-m", "SimpleHTTPServer", "800${NOMAD_ALLOC_INDEX}"]
            }

            service {
                name = "webservice"
                tags = ["http", "python", "master"]
                check {
                    type = "script"
                    name = "check_http_800${NOMAD_ALLOC_INDEX}"
                    command = "/usr/local/bin/health.sh"
                    args = ["800${NOMAD_ALLOC_INDEX}"]
                    interval = "5s"
                    timeout = "1s"
                }
            }

            resources {
                cpu = 500
                memory = 64
                network {
                    mbits = 10
                }
            }
        }
    }
}

[dadgar]

Nice find! Will get this fixed! Thanks

[diptanu]

@sean- Can you please verify whether your PR fixes this?

[diptanu]

I can see the codepath of updating the task is interpolating the service tags as well, so closing it. Fixed by #1201

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