如何将变量值传递给 Helm 图表中的 .Files.Glob？

在Golang实战开发的过程中，我们经常会遇到一些这样那样的问题，然后要卡好半天，等问题解决了才发现原来一些细节知识点还是没有掌握好。今天golang学习网就整理分享《如何将变量值传递给 Helm 图表中的 .Files.Glob？》，聊聊，希望可以帮助到正在努力赚钱的你。

下面对 .files.glob 的调用需要来自作为 .values.initdbfilesglob 的值提供的变量。该值已正确设置，但 if 条件未计算为真，即使 .values.initdbconfigmap 为空。

如何将变量参数传递给 .files.glob？

有问题的模板（来自我的 wip 图表的 templates/initdb-configmap.yaml https://github.com/northscaler/charts/tree/support-env-specific-init/bitnami/cassandra，我将提交到 https修复此问题后，将://github.com/bitnami/charts/tree/master/bitnami/cassandra 作为 pr）：

{{- $initdbfilesglob := .values.initdbfilesglob -}}
# "{{ $initdbfilesglob }}" "{{ .values.initdbconfigmap }}"
# there should be content below this
{{- if and (.files.glob $initdbfilesglob) (not .values.initdbconfigmap) }}
apiversion: v1
kind: configmap
metadata:
  name: {{ include "cassandra.fullname" . }}-init-scripts
  labels: {{- include "cassandra.labels" . | nindent 4 }}
data:
{{ (.files.glob $initdbfilesglob).asconfig | indent 2 }}
{{- end }}

文件 values.yaml：

dbuser:
  forcepassword: true
  password: cassandra
initdbfilesglob: 'files/devops/docker-entrypoint-initdb.d/*'

命令：helm template -f value.yaml foobar /users/matthewadams/dev/bitnami/charts/bitnami/cassandra

相对于我调用命令的目录，files/devops/docker-entrypoint-initdb.d 中有 个文件。

输出：

---
# source: cassandra/templates/pdb.yaml
apiversion: policy/v1beta1
kind: poddisruptionbudget
metadata:
  name: foobar-cassandra-headless
  labels:
    app: cassandra
    chart: cassandra-5.1.2
    release: foobar
    heritage: helm
spec:
  selector:
    matchlabels:
      app: cassandra
      release: foobar
  maxunavailable: 1
---
# source: cassandra/templates/cassandra-secret.yaml
apiversion: v1
kind: secret
metadata:
  name: foobar-cassandra
  labels:
    app: cassandra
    chart: cassandra-5.1.2
    release: foobar
    heritage: helm
type: opaque
data:
  cassandra-password: "y2fzc2fuzhjh"
---
# source: cassandra/templates/configuration-cm.yaml
# files/conf/*

apiversion: v1
kind: configmap
# files/conf/*
metadata:
  name: foobar-cassandra-configuration
  labels:
    app: cassandra
    chart: cassandra-5.1.2
    release: foobar
    heritage: helm
data:
  readme.md: |
    place your cassandra configuration files here. this will override the values set in any configuration environment variable. this will not be used in case the value *existingconfiguration* is used.

    more information [here](https://github.com/bitnami/bitnami-docker-cassandra#configuration)
---
# source: cassandra/templates/headless-svc.yaml
apiversion: v1
kind: service
metadata:
  name: foobar-cassandra-headless
  labels:
    app: cassandra
    chart: cassandra-5.1.2
    release: foobar
    heritage: helm
spec:
  clusterip: none
  publishnotreadyaddresses: true
  ports:
    - name: intra
      port: 7000
      targetport: intra
    - name: tls
      port: 7001
      targetport: tls
    - name: jmx
      port: 7199
      targetport: jmx
    - name: cql
      port: 9042
      targetport: cql
    - name: thrift
      port: 9160
      targetport: thrift
  selector:
    app: cassandra
    release: foobar
---
# source: cassandra/templates/service.yaml
apiversion: v1
kind: service
metadata:
  name: foobar-cassandra
  labels:
    app: cassandra
    chart: cassandra-5.1.2
    release: foobar
    heritage: helm
  annotations: 
    {}
spec:
  type: clusterip
  ports:
    - name: cql
      port: 9042
      targetport: cql
      nodeport: null
    - name: thrift
      port: 9160
      targetport: thrift
      nodeport: null
  selector:
    app: cassandra
    release: foobar
---
# source: cassandra/templates/statefulset.yaml
apiversion: apps/v1
kind: statefulset
metadata:
  name: foobar-cassandra
  labels:
    app: cassandra
    chart: cassandra-5.1.2
    release: foobar
    heritage: helm
spec:
  selector:
    matchlabels:
      app: cassandra
      release: foobar
  servicename: foobar-cassandra-headless
  replicas: 1
  updatestrategy:
    type: ondelete
  template:
    metadata:
      labels:
        app: cassandra
        chart: cassandra-5.1.2
        release: foobar
        heritage: helm
    spec:

      securitycontext:
        fsgroup: 1001
        runasuser: 1001
      containers:
        - name: cassandra
          command:
            - bash
            - -ec
            # node 0 is the password seeder
            - |
              if [[ $hostname =~ (.*)-0$ ]]; then
                echo "setting node as password seeder"
                export cassandra_password_seeder=yes
              else
                # only node 0 will execute the startup initdb scripts
                export cassandra_ignore_initdb_scripts=1
              fi
              /entrypoint.sh /run.sh
          image: docker.io/bitnami/cassandra:3.11.6-debian-10-r26
          imagepullpolicy: "ifnotpresent"
          env:
            - name: bitnami_debug
              value: "false"
            - name: cassandra_cluster_name
              value: cassandra
            - name: cassandra_seeds
              value: "foobar-cassandra-0.foobar-cassandra-headless.default.svc.cluster.local"
            - name: cassandra_password
              valuefrom:
                secretkeyref:
                  name: foobar-cassandra
                  key: cassandra-password
            - name: pod_ip
              valuefrom:
                fieldref:
                  fieldpath: status.podip
            - name: cassandra_user
              value: "cassandra"
            - name: cassandra_num_tokens
              value: "256"
            - name: cassandra_datacenter
              value: dc1
            - name: cassandra_endpoint_snitch
              value: simplesnitch
            - name: cassandra_endpoint_snitch
              value: simplesnitch
            - name: cassandra_rack
              value: rack1
            - name: cassandra_enable_rpc
              value: "true"
          livenessprobe:
            exec:
              command: ["/bin/sh", "-c", "nodetool status"]
            initialdelayseconds: 60
            periodseconds: 30
            timeoutseconds: 5
            successthreshold: 1
            failurethreshold: 5
          readinessprobe:
            exec:
              command: ["/bin/sh", "-c", "nodetool status | grep -e \"^un\\s+${pod_ip}\""]
            initialdelayseconds: 60
            periodseconds: 10
            timeoutseconds: 5
            successthreshold: 1
            failurethreshold: 5
          ports:
            - name: intra
              containerport: 7000
            - name: tls
              containerport: 7001
            - name: jmx
              containerport: 7199
            - name: cql
              containerport: 9042
            - name: thrift
              containerport: 9160
          resources: 
            limits: {}
            requests: {}
          volumemounts:
            - name: data
              mountpath: /bitnami/cassandra
            - name: init-db
              mountpath: /docker-entrypoint-initdb.d

            - name: configurations
              mountpath: /bitnami/cassandra/conf
      volumes:
        - name: configurations
          configmap:
            name: foobar-cassandra-configuration
        - name: init-db
          configmap:
            name: foobar-cassandra-init-scripts
  volumeclaimtemplates:
    - metadata:
        name: data
        labels:
          app: cassandra
          release: foobar
      spec:
        accessmodes:
          - "readwriteonce"
        resources:
          requests:
            storage: "8gi"
---
# source: cassandra/templates/initdb-configmap.yaml
# "files/devops/docker-entrypoint-initdb.d/*" ""
# there should be content below this

如果我注释掉 values.yaml 中设置 initdbfilesglob 的行，模板将正确呈现：

...
---
# Source: cassandra/templates/initdb-configmap.yaml
# "files/docker-entrypoint-initdb.d/*" ""
# There should be content below this
apiVersion: v1
kind: ConfigMap
metadata:
  name: foobar-cassandra-init-scripts
  labels:
    app: cassandra
    chart: cassandra-5.1.2
    release: foobar
    heritage: Helm
data:
  README.md: |
    You can copy here your custom `.sh` or `.cql` file so they are executed during the first boot of the image.

    More info in the [bitnami-docker-cassandra](https://github.com/bitnami/bitnami-docker-cassandra#initializing-a-new-instance) repository.

解决方案

我可以通过使用 printf 函数初始化变量来完成此操作，如下所示：

{{- $initDBFilesGlob := printf "%s" .Values.initDBFilesGlob -}}

以上就是《如何将变量值传递给 Helm 图表中的 .Files.Glob？》的详细内容，更多关于的资料请关注golang学习网公众号！