charts: Permit setting hostUsers for deployment

Signed-off-by: Pat Riehecky <riehecky@fnal.gov>

Author: jcpunk

charts/headlamp/README.md

@@ -150,6 +150,7 @@ config:
 | clusterRoleBinding.create | bool | `true` | Create cluster role binding |
 | clusterRoleBinding.clusterRoleName | string | `"cluster-admin"` | Kubernetes ClusterRole name |
 | clusterRoleBinding.annotations | object | `{}` | Cluster role binding annotations |
+| hostUsers | bool | `true` | Run in host uid namespace |
 | podSecurityContext | object | `{}` | Pod security context (e.g., fsGroup: 2000) |
 | securityContext.runAsNonRoot | bool | `true` | Run container as non-root |
 | securityContext.privileged | bool | `false` | Run container in privileged mode |
@@ -158,6 +159,8 @@ config:
 | securityContext.capabilities | object | `{}` | Container capabilities (e.g., drop: [ALL]) |
 | securityContext.readOnlyRootFilesystem | bool | `false` | Mount root filesystem as read-only |
 
+NOTE: for `hostUsers=false` user namespaces must be supported. See: https://kubernetes.io/docs/concepts/workloads/pods/user-namespaces/
+
 ### Storage Configuration
 
 | Key | Type | Default | Description |

charts/headlamp/templates/deployment.yaml

@@ -81,6 +81,7 @@ spec:
       {{- end }}
       serviceAccountName: {{ include "headlamp.serviceAccountName" . }}
       automountServiceAccountToken: {{ .Values.automountServiceAccountToken }}
+      hostUsers: {{ .Values.hostUsers }}
       securityContext:
         {{- toYaml .Values.podSecurityContext | nindent 8 }}
       {{- with .Values.initContainers }}

charts/headlamp/tests/expected_templates/azure-oidc-with-validators.yaml

@@ -85,6 +85,7 @@ spec:
     spec:
       serviceAccountName: headlamp
       automountServiceAccountToken: true
+      hostUsers: true
       securityContext:
         {}
       containers:

charts/headlamp/tests/expected_templates/default.yaml

@@ -94,6 +94,7 @@ spec:
     spec:
       serviceAccountName: headlamp
       automountServiceAccountToken: true
+      hostUsers: true
       securityContext:
         {}
       containers:

charts/headlamp/tests/expected_templates/extra-args.yaml

@@ -94,6 +94,7 @@ spec:
     spec:
       serviceAccountName: headlamp
       automountServiceAccountToken: true
+      hostUsers: true
       securityContext:
         {}
       containers:

charts/headlamp/tests/expected_templates/extra-manifests.yaml

@@ -111,6 +111,7 @@ spec:
     spec:
       serviceAccountName: headlamp
       automountServiceAccountToken: true
+      hostUsers: true
       securityContext:
         {}
       containers:

charts/headlamp/tests/expected_templates/host-users-override.yaml

@@ -0,0 +1,128 @@
+---
+# Source: headlamp/templates/serviceaccount.yaml
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: headlamp
+  namespace: default
+  labels:
+    helm.sh/chart: headlamp-0.39.0
+    app.kubernetes.io/name: headlamp
+    app.kubernetes.io/instance: headlamp
+    app.kubernetes.io/version: "0.39.0"
+    app.kubernetes.io/managed-by: Helm
+---
+# Source: headlamp/templates/secret.yaml
+apiVersion: v1
+kind: Secret
+metadata:
+  name: oidc
+  namespace: default
+type: Opaque
+data:
+---
+# Source: headlamp/templates/clusterrolebinding.yaml
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: headlamp-admin
+  labels:
+    helm.sh/chart: headlamp-0.39.0
+    app.kubernetes.io/name: headlamp
+    app.kubernetes.io/instance: headlamp
+    app.kubernetes.io/version: "0.39.0"
+    app.kubernetes.io/managed-by: Helm
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: cluster-admin
+subjects:
+- kind: ServiceAccount
+  name: headlamp
+  namespace: default
+---
+# Source: headlamp/templates/service.yaml
+apiVersion: v1
+kind: Service
+metadata:
+  name: headlamp
+  namespace: default
+  labels:
+    helm.sh/chart: headlamp-0.39.0
+    app.kubernetes.io/name: headlamp
+    app.kubernetes.io/instance: headlamp
+    app.kubernetes.io/version: "0.39.0"
+    app.kubernetes.io/managed-by: Helm
+spec:
+  type: ClusterIP
+  
+  ports:
+    - port: 80
+      targetPort: http
+      protocol: TCP
+      name: http
+  selector:
+    app.kubernetes.io/name: headlamp
+    app.kubernetes.io/instance: headlamp
+---
+# Source: headlamp/templates/deployment.yaml
+# This block of code is used to extract the values from the env.
+# This is done to check if the values are non-empty and if they are, they are used in the deployment.yaml.
+
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: headlamp
+  namespace: default
+  labels:
+    helm.sh/chart: headlamp-0.39.0
+    app.kubernetes.io/name: headlamp
+    app.kubernetes.io/instance: headlamp
+    app.kubernetes.io/version: "0.39.0"
+    app.kubernetes.io/managed-by: Helm
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: headlamp
+      app.kubernetes.io/instance: headlamp
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: headlamp
+        app.kubernetes.io/instance: headlamp
+    spec:
+      serviceAccountName: headlamp
+      automountServiceAccountToken: true
+      hostUsers: false
+      securityContext:
+        {}
+      containers:
+        - name: headlamp
+          securityContext:
+            privileged: false
+            runAsGroup: 101
+            runAsNonRoot: true
+            runAsUser: 100
+          image: "ghcr.io/headlamp-k8s/headlamp:v0.39.0"
+          imagePullPolicy: IfNotPresent
+          
+          env:
+          args:
+            - "-in-cluster"
+            - "-plugins-dir=/headlamp/plugins"
+            # Check if externalSecret is disabled
+          ports:
+            - name: http
+              containerPort: 4466
+              protocol: TCP
+          livenessProbe:
+            httpGet:
+              path: "/"
+              port: http
+          readinessProbe:
+            httpGet:
+              path: "/"
+              port: http
+          resources:
+            {}

charts/headlamp/tests/expected_templates/me-user-info-url-directly.yaml

@@ -94,6 +94,7 @@ spec:
     spec:
       serviceAccountName: headlamp
       automountServiceAccountToken: true
+      hostUsers: true
       securityContext:
         {}
       containers:

charts/headlamp/tests/expected_templates/me-user-info-url.yaml

@@ -94,6 +94,7 @@ spec:
     spec:
       serviceAccountName: headlamp
       automountServiceAccountToken: true
+      hostUsers: true
       securityContext:
         {}
       containers:

charts/headlamp/tests/expected_templates/namespace-override-oidc-create-secret.yaml

@@ -98,6 +98,7 @@ spec:
     spec:
       serviceAccountName: headlamp
       automountServiceAccountToken: true
+      hostUsers: true
       securityContext:
         {}
       containers: