${NOMAD_TASK_DIR} value not rendered in template body

[sssilver]

Nomad version

Nomad v1.4.3 (f464aca)

Operating system and Environment details

Ubuntu 22.04.1 LTS
Linux ironforge 5.15.0-56-generic #62-Ubuntu SMP Tue Nov 22 19:54:14 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

Issue

It looks like ${NOMAD_TASK_DIR} is not being rendered in my job template:

...
      template {
        destination = "${NOMAD_TASK_DIR}/config.yaml"
        change_mode = "restart"
        data = <<EOH
tunnel: f562a054-f138-4667-8799-3f5f9e996eae
credentials-file: ${NOMAD_TASK_DIR}/ironforge-credentials.json  # <------ Referencing the variable, expecting it to be substituted

metrics: :5000
no-autoupdate: true
warp-routing:
  enabled: true
ingress:
{{- range nomadService "hello" }}
- service: http://{{ .Address }}:{{ .Port }}
  hostname: ironforge.x17.space
{{- end }}

- service: http_status:404
EOH
      }

Here's the rendered template:

λ ~/projects/ironforge/ nomad alloc fs be37f4e6 cloudflared/local/config.yaml
tunnel: f562a054-f138-4667-8799-3f5f9e996eae
credentials-file: ${NOMAD_TASK_DIR}/ironforge-credentials.json  <-------- NOTICE: Templated value not rendered!!

metrics: :5000
no-autoupdate: true
warp-routing:
  enabled: true
ingress:
- service: http://192.168.86.36:26308
  hostname: ironforge.x17.space

- service: http_status:404

Am I missing something, or is this a bug?

Reproduction steps

• Create a job with a template stanza that references ${NOMAD_TASK_DIR} in data
• Run the job
• Observe that the rendered template does not substitute the ${NOMAD_TASK_DIR} value

Expected Result

• ${NOMAD_TASK_DIR} value is properly rendered from the template into the final file

[krundru]

template follows {{ env "NOMAD_TASK_DIR" }} syntax.

For example, this is how we are rendering part of envoy yaml file

  - name: xds_cluster
    type: STATIC
    connect_timeout: 10s
    http2_protocol_options: {}
    load_assignment:
      cluster_name: xds_cluster
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: {{ env "attr.unique.network.ip-address" }}
                port_value: 5678

[sssilver]

Thanks @krundru!

I'll close the issue, with the caveat that the docs could have been more clear on this.

[github-actions]

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