job env changes dots to underscores

[TheCase]

Nomad version

Nomad v0.7.1 (0b295d3)

Nomad.hcl

job "envtest" {
  datacenters = [ "tec1" ]
  type = "service"

  group "test" {
    count = 1
    task "test" {
      driver = "docker"
      config {
        image = "nginx"
      }
      env {
        foo.bar = "foobar"
      }
      resources {
        cpu    = 100 # MHz
        memory = 100 # MB
        network { mbits = 100 }
      }
    }
  }
}

Issue

dot character in environment variable name is replaced with an underscore

Reproduction steps

inside docker container, note that dot has been replace with underscore:

# export
export foo_bar='foobar'

Use case; Elasticsearch container images can use environment variables with dots in the (ie. discovery.zen.ping.unicast.hosts)

Not a blocker, as I can use a template for configuration, but I would like to be able to use env values instead.

[shantanugadgil]

Possibly fixed as part of:
#3760

Also mentioned in the CHANGELOG.md

HTH,
Shantanu

[chelseakomlo]

Thanks for reporting this issue- as mentioned, see #3760. This fix will be included in our next release.

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