Nomad Consul template functions (hasPrefix)

Consul
,
#1

Is there any way I can access or filter for a service tag with a certain prefix?

{{ range .Tags }}{{ if hasPrefix "worker-version" . }}{{ trimPrefix "worker-version-" . }}{{ end }}{{ end }}

hasPrefix or sprig_hasPrefix are not defined…

Any {{ if ...}} would work, but {{ if eq ... }} is the only working example I’ve found.

trimPrefix is explicitly listed in the documentation but is not defined either. What does work?

consul-template/templating-language.md at main · hashicorp/consul-template · GitHub mentions sprig, but it doesn’t seem like any of the following work.

{{ "hello!" | upper | repeat 5 }}

{{ "hello!" | sprig_upper | sprig_repeat 5 }}

Error in Nomad:

Template failed: (dynamic): parse: template: :1: function “sprig_upper” not defined

#2

Using service.meta instead of tags works better for this:

Nomad:

template {
  data = "... {{ range service "worker" }}{{ index .ServiceMeta "worker-version" }}{{ end }} ..."
}

service {
  meta {
    worker-version = "1.0"
  }
}