Is it possible to use a template inside a template with go template












0















Using https://golang.org/pkg/text/template/, I sometimes need to use variables in the accessed path (for kubernetes deployments).



I end up writing something like :



{{ if (eq .Values.cluster "aws" }}{{ .Values.redis.aws.masterHost | quote }}{{else}}{{ .Values.redis.gcp.masterHost | quote }}{{end}}


What I'd really like to write is pretty much {{ .Values.redis.{{.Values.cluster}}.masterHost | quote }} , which doesn't compile.



Is there a way to write something similar ? (so having a kind of variable in the accessed path).






go kubernetes-helm







share|improve this question























  • Is .Values.redis a map or a struct? Or something else?

    – icza
    Nov 16 '18 at 15:21











  • I believe it's a struct

    – C4stor
    Nov 16 '18 at 16:35











  • I'm asking because if it's a map, you may use {{index}}. If it's a struct, you may add methods to it.

    – icza
    Nov 16 '18 at 16:47











  • It's a map and index is the right answer.

    – David Maze
    Nov 16 '18 at 19:20
















0















Using https://golang.org/pkg/text/template/, I sometimes need to use variables in the accessed path (for kubernetes deployments).



I end up writing something like :



{{ if (eq .Values.cluster "aws" }}{{ .Values.redis.aws.masterHost | quote }}{{else}}{{ .Values.redis.gcp.masterHost | quote }}{{end}}


What I'd really like to write is pretty much {{ .Values.redis.{{.Values.cluster}}.masterHost | quote }} , which doesn't compile.



Is there a way to write something similar ? (so having a kind of variable in the accessed path).






go kubernetes-helm







share|improve this question























  • Is .Values.redis a map or a struct? Or something else?

    – icza
    Nov 16 '18 at 15:21











  • I believe it's a struct

    – C4stor
    Nov 16 '18 at 16:35











  • I'm asking because if it's a map, you may use {{index}}. If it's a struct, you may add methods to it.

    – icza
    Nov 16 '18 at 16:47











  • It's a map and index is the right answer.

    – David Maze
    Nov 16 '18 at 19:20














0












0








0








Using https://golang.org/pkg/text/template/, I sometimes need to use variables in the accessed path (for kubernetes deployments).



I end up writing something like :



{{ if (eq .Values.cluster "aws" }}{{ .Values.redis.aws.masterHost | quote }}{{else}}{{ .Values.redis.gcp.masterHost | quote }}{{end}}


What I'd really like to write is pretty much {{ .Values.redis.{{.Values.cluster}}.masterHost | quote }} , which doesn't compile.



Is there a way to write something similar ? (so having a kind of variable in the accessed path).






go kubernetes-helm







share|improve this question














Using https://golang.org/pkg/text/template/, I sometimes need to use variables in the accessed path (for kubernetes deployments).



I end up writing something like :



{{ if (eq .Values.cluster "aws" }}{{ .Values.redis.aws.masterHost | quote }}{{else}}{{ .Values.redis.gcp.masterHost | quote }}{{end}}


What I'd really like to write is pretty much {{ .Values.redis.{{.Values.cluster}}.masterHost | quote }} , which doesn't compile.



Is there a way to write something similar ? (so having a kind of variable in the accessed path).






go kubernetes-helm




go kubernetes-helm






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 16 '18 at 15:09









C4storC4stor

6,12032138




6,12032138













  • Is .Values.redis a map or a struct? Or something else?

    – icza
    Nov 16 '18 at 15:21











  • I believe it's a struct

    – C4stor
    Nov 16 '18 at 16:35











  • I'm asking because if it's a map, you may use {{index}}. If it's a struct, you may add methods to it.

    – icza
    Nov 16 '18 at 16:47











  • It's a map and index is the right answer.

    – David Maze
    Nov 16 '18 at 19:20



















  • Is .Values.redis a map or a struct? Or something else?

    – icza
    Nov 16 '18 at 15:21











  • I believe it's a struct

    – C4stor
    Nov 16 '18 at 16:35











  • I'm asking because if it's a map, you may use {{index}}. If it's a struct, you may add methods to it.

    – icza
    Nov 16 '18 at 16:47











  • It's a map and index is the right answer.

    – David Maze
    Nov 16 '18 at 19:20

















Is .Values.redis a map or a struct? Or something else?

– icza
Nov 16 '18 at 15:21





Is .Values.redis a map or a struct? Or something else?

– icza
Nov 16 '18 at 15:21













I believe it's a struct

– C4stor
Nov 16 '18 at 16:35





I believe it's a struct

– C4stor
Nov 16 '18 at 16:35













I'm asking because if it's a map, you may use {{index}}. If it's a struct, you may add methods to it.

– icza
Nov 16 '18 at 16:47





I'm asking because if it's a map, you may use {{index}}. If it's a struct, you may add methods to it.

– icza
Nov 16 '18 at 16:47













It's a map and index is the right answer.

– David Maze
Nov 16 '18 at 19:20





It's a map and index is the right answer.

– David Maze
Nov 16 '18 at 19:20












1 Answer
1






active

oldest

votes


















1














You can use _helpers.tpl file to define logic and operate with values.



_helpers.tpl



{{/*

Get redis host based on cluster.

*/}}

{{- define "chart.getRedis" -}}

{{- if eq .Values.cluster "aws" -}}

{{- .Values.redis.aws.masterHost | quote -}}

{{- else -}}

{{- .Values.redis.gcp.masterHost | quote -}}

{{- end -}}

{{- end -}}


values.yaml



cluster: local

redis:

  aws:

    masterHost: "my-aws-host"

  gcp:

    masterHost: "my-gcp-host"


And use it in your Deployment (here's a ConfigMap example to keep it shorter)



configmap.yaml



apiVersion: v1

kind: ConfigMap

metadata:

  name: Configmap

data:

  redis: {{ template "chart.getRedis" . }}


Output:



helm install --dry-run --debug mychart



[debug] Created tunnel using local port: '64712'



...



COMPUTED VALUES:

cluster: local

redis:

  aws:

    masterHost: my-aws-host

  gcp:

    masterHost: my-gcp-host



HOOKS:

MANIFEST:



---

# Source: mychart/templates/configmap.yaml

apiVersion: v1

kind: ConfigMap

metadata:

  name: Configmap

data:

  redis: "my-gcp-host"


Set cluster value to aws:



helm install --dry-run --debug mychart --set-string=cluster=aws



[debug] Created tunnel using local port: '64712'



...



COMPUTED VALUES:

cluster: local

redis:

  aws:

    masterHost: my-aws-host

  gcp:

    masterHost: my-gcp-host



HOOKS:

MANIFEST:



---

# Source: mychart/templates/configmap.yaml

apiVersion: v1

kind: ConfigMap

metadata:

  name: Configmap

data:

  redis: "my-aws-host"





share|improve this answer
























  • Great solution, thanks !

    – C4stor
    Dec 10 '18 at 10:25











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1 Answer
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1 Answer
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active

oldest

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active

oldest

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active

oldest

votes









1














You can use _helpers.tpl file to define logic and operate with values.



_helpers.tpl



{{/*

Get redis host based on cluster.

*/}}

{{- define "chart.getRedis" -}}

{{- if eq .Values.cluster "aws" -}}

{{- .Values.redis.aws.masterHost | quote -}}

{{- else -}}

{{- .Values.redis.gcp.masterHost | quote -}}

{{- end -}}

{{- end -}}


values.yaml



cluster: local

redis:

  aws:

    masterHost: "my-aws-host"

  gcp:

    masterHost: "my-gcp-host"


And use it in your Deployment (here's a ConfigMap example to keep it shorter)



configmap.yaml



apiVersion: v1

kind: ConfigMap

metadata:

  name: Configmap

data:

  redis: {{ template "chart.getRedis" . }}


Output:



helm install --dry-run --debug mychart



[debug] Created tunnel using local port: '64712'



...



COMPUTED VALUES:

cluster: local

redis:

  aws:

    masterHost: my-aws-host

  gcp:

    masterHost: my-gcp-host



HOOKS:

MANIFEST:



---

# Source: mychart/templates/configmap.yaml

apiVersion: v1

kind: ConfigMap

metadata:

  name: Configmap

data:

  redis: "my-gcp-host"


Set cluster value to aws:



helm install --dry-run --debug mychart --set-string=cluster=aws



[debug] Created tunnel using local port: '64712'



...



COMPUTED VALUES:

cluster: local

redis:

  aws:

    masterHost: my-aws-host

  gcp:

    masterHost: my-gcp-host



HOOKS:

MANIFEST:



---

# Source: mychart/templates/configmap.yaml

apiVersion: v1

kind: ConfigMap

metadata:

  name: Configmap

data:

  redis: "my-aws-host"





share|improve this answer
























  • Great solution, thanks !

    – C4stor
    Dec 10 '18 at 10:25
















1














You can use _helpers.tpl file to define logic and operate with values.



_helpers.tpl



{{/*

Get redis host based on cluster.

*/}}

{{- define "chart.getRedis" -}}

{{- if eq .Values.cluster "aws" -}}

{{- .Values.redis.aws.masterHost | quote -}}

{{- else -}}

{{- .Values.redis.gcp.masterHost | quote -}}

{{- end -}}

{{- end -}}


values.yaml



cluster: local

redis:

  aws:

    masterHost: "my-aws-host"

  gcp:

    masterHost: "my-gcp-host"


And use it in your Deployment (here's a ConfigMap example to keep it shorter)



configmap.yaml



apiVersion: v1

kind: ConfigMap

metadata:

  name: Configmap

data:

  redis: {{ template "chart.getRedis" . }}


Output:



helm install --dry-run --debug mychart



[debug] Created tunnel using local port: '64712'



...



COMPUTED VALUES:

cluster: local

redis:

  aws:

    masterHost: my-aws-host

  gcp:

    masterHost: my-gcp-host



HOOKS:

MANIFEST:



---

# Source: mychart/templates/configmap.yaml

apiVersion: v1

kind: ConfigMap

metadata:

  name: Configmap

data:

  redis: "my-gcp-host"


Set cluster value to aws:



helm install --dry-run --debug mychart --set-string=cluster=aws



[debug] Created tunnel using local port: '64712'



...



COMPUTED VALUES:

cluster: local

redis:

  aws:

    masterHost: my-aws-host

  gcp:

    masterHost: my-gcp-host



HOOKS:

MANIFEST:



---

# Source: mychart/templates/configmap.yaml

apiVersion: v1

kind: ConfigMap

metadata:

  name: Configmap

data:

  redis: "my-aws-host"





share|improve this answer
























  • Great solution, thanks !

    – C4stor
    Dec 10 '18 at 10:25














1












1








1







You can use _helpers.tpl file to define logic and operate with values.



_helpers.tpl



{{/*

Get redis host based on cluster.

*/}}

{{- define "chart.getRedis" -}}

{{- if eq .Values.cluster "aws" -}}

{{- .Values.redis.aws.masterHost | quote -}}

{{- else -}}

{{- .Values.redis.gcp.masterHost | quote -}}

{{- end -}}

{{- end -}}


values.yaml



cluster: local

redis:

  aws:

    masterHost: "my-aws-host"

  gcp:

    masterHost: "my-gcp-host"


And use it in your Deployment (here's a ConfigMap example to keep it shorter)



configmap.yaml



apiVersion: v1

kind: ConfigMap

metadata:

  name: Configmap

data:

  redis: {{ template "chart.getRedis" . }}


Output:



helm install --dry-run --debug mychart



[debug] Created tunnel using local port: '64712'



...



COMPUTED VALUES:

cluster: local

redis:

  aws:

    masterHost: my-aws-host

  gcp:

    masterHost: my-gcp-host



HOOKS:

MANIFEST:



---

# Source: mychart/templates/configmap.yaml

apiVersion: v1

kind: ConfigMap

metadata:

  name: Configmap

data:

  redis: "my-gcp-host"


Set cluster value to aws:



helm install --dry-run --debug mychart --set-string=cluster=aws



[debug] Created tunnel using local port: '64712'



...



COMPUTED VALUES:

cluster: local

redis:

  aws:

    masterHost: my-aws-host

  gcp:

    masterHost: my-gcp-host



HOOKS:

MANIFEST:



---

# Source: mychart/templates/configmap.yaml

apiVersion: v1

kind: ConfigMap

metadata:

  name: Configmap

data:

  redis: "my-aws-host"





share|improve this answer













You can use _helpers.tpl file to define logic and operate with values.



_helpers.tpl



{{/*

Get redis host based on cluster.

*/}}

{{- define "chart.getRedis" -}}

{{- if eq .Values.cluster "aws" -}}

{{- .Values.redis.aws.masterHost | quote -}}

{{- else -}}

{{- .Values.redis.gcp.masterHost | quote -}}

{{- end -}}

{{- end -}}


values.yaml



cluster: local

redis:

  aws:

    masterHost: "my-aws-host"

  gcp:

    masterHost: "my-gcp-host"


And use it in your Deployment (here's a ConfigMap example to keep it shorter)



configmap.yaml



apiVersion: v1

kind: ConfigMap

metadata:

  name: Configmap

data:

  redis: {{ template "chart.getRedis" . }}


Output:



helm install --dry-run --debug mychart



[debug] Created tunnel using local port: '64712'



...



COMPUTED VALUES:

cluster: local

redis:

  aws:

    masterHost: my-aws-host

  gcp:

    masterHost: my-gcp-host



HOOKS:

MANIFEST:



---

# Source: mychart/templates/configmap.yaml

apiVersion: v1

kind: ConfigMap

metadata:

  name: Configmap

data:

  redis: "my-gcp-host"


Set cluster value to aws:



helm install --dry-run --debug mychart --set-string=cluster=aws



[debug] Created tunnel using local port: '64712'



...



COMPUTED VALUES:

cluster: local

redis:

  aws:

    masterHost: my-aws-host

  gcp:

    masterHost: my-gcp-host



HOOKS:

MANIFEST:



---

# Source: mychart/templates/configmap.yaml

apiVersion: v1

kind: ConfigMap

metadata:

  name: Configmap

data:

  redis: "my-aws-host"






share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 23 '18 at 12:39









edbigheadedbighead

600212




600212













  • Great solution, thanks !

    – C4stor
    Dec 10 '18 at 10:25



















  • Great solution, thanks !

    – C4stor
    Dec 10 '18 at 10:25

















Great solution, thanks !

– C4stor
Dec 10 '18 at 10:25





Great solution, thanks !

– C4stor
Dec 10 '18 at 10:25




















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