add utility to run temporary pod with pvc mounted

utils/kubectl-run-with-pvc.sh

@@ -0,0 +1,146 @@
+#!/usr/bin/env bash
+
+# A utility script to run a kubectl pod with one or more PVCs mounted.
+# Original: https://gist.github.com/yuanying/3aa7d59dcce65470804ab43def646ab6
+# Modified to add help message, -n and -x options, and other improvements.
+
+IMAGE="gcr.io/google-containers/ubuntu-slim:0.14"
+COMMAND="/bin/bash"
+NAMESPACE=""
+CONTEXT=""
+SUFFIX=$(date +%s | shasum | base64 | fold -w 10 | head -1 | tr '[:upper:]' '[:lower:]')
+
+usage_exit() {
+    cat <<EOF
+kubectl-run-with-pvc - Run a temporary pod with PersistentVolumeClaims mounted
+
+USAGE:
+    $0 [-c command] [-i image] [-n namespace] [-x context] [-h] PVC [PVC ...]
+
+DESCRIPTION:
+    Creates an ephemeral Kubernetes pod that mounts one or more PersistentVolumeClaims (PVCs).
+    Each PVC is mounted at /pvcs/<claimName>. The pod is automatically removed when you exit.
+    
+    Useful for inspecting, debugging, or manipulating data in PVCs without having to deploy
+    a persistent pod or job.
+
+OPTIONS:
+    -i IMAGE
+        Container image to use in the pod.
+        Default: gcr.io/google-containers/ubuntu-slim:0.14
+
+    -c COMMAND
+        Command to execute in the container.
+        Default: /bin/bash
+
+    -n NAMESPACE
+        Kubernetes namespace where the pod will be created.
+        Default: current namespace (from kubectl config)
+
+    -x CONTEXT
+        kubectl context to use for this operation.
+        Default: current context (from kubectl config)
+
+    -h
+        Display this help message and exit.
+
+EXAMPLES:
+    # Mount a single PVC and get an interactive shell
+    $0 my-pvc
+
+    # Mount multiple PVCs
+    $0 data-pvc logs-pvc config-pvc
+
+    # Use a specific namespace
+    $0 -n my-namespace my-pvc
+
+    # Use a different context and namespace
+    $0 -x prod-cluster -n production my-pvc
+
+    # Use Alpine Linux instead of Ubuntu
+    $0 -i alpine:latest -c sh my-pvc
+
+    # Run a command non-interactively
+    $0 -c "ls -lh /pvcs/my-pvc" my-pvc
+
+MOUNT PATHS:
+    Each PVC is mounted to: /pvcs/<claimName>
+    
+    Example: If you mount 'database-pvc', it will be at /pvcs/database-pvc
+
+NOTES:
+    - Pod name is auto-generated: pvc-mounter-<random-suffix>
+    - Pod is removed when you exit (--rm flag)
+    - Uses hostNetwork: true for networking access
+    - Requires kubectl configured and permissions to create pods
+
+PREREQUISITES:
+    - kubectl installed and configured
+    - PVCs must already exist in the target namespace
+    - User must have permission to create pods in the target namespace
+
+EOF
+    exit 1
+}
+
+while getopts i:c:n:x:h OPT
+do
+    case $OPT in
+        i)  IMAGE=$OPTARG
+            ;;
+        c)  COMMAND=$OPTARG
+            ;;
+        n)  NAMESPACE=$OPTARG
+            ;;
+        x)  CONTEXT=$OPTARG
+            ;;
+        h)  usage_exit
+            ;;
+        \?) usage_exit
+            ;;
+    esac
+done
+shift $(($OPTIND - 1))
+
+# Require at least one PVC
+if [ $# -eq 0 ]; then
+    echo "Error: At least one PVC name is required" 1>&2
+    usage_exit
+fi
+
+VOL_MOUNTS=""
+VOLS=""
+COMMA=""
+
+for i in $@
+do
+  VOL_MOUNTS="${VOL_MOUNTS}${COMMA}{\"name\": \"${i}\",\"mountPath\": \"/pvcs/${i}\"}"
+  VOLS="${VOLS}${COMMA}{\"name\": \"${i}\",\"persistentVolumeClaim\": {\"claimName\": \"${i}\"}}"
+  COMMA=","
+done
+
+KUBECTL_CMD="kubectl"
+[ -n "$CONTEXT" ] && KUBECTL_CMD="$KUBECTL_CMD --context=$CONTEXT"
+[ -n "$NAMESPACE" ] && KUBECTL_CMD="$KUBECTL_CMD --namespace=$NAMESPACE"
+
+$KUBECTL_CMD run -it --rm --restart=Never --image=${IMAGE} pvc-mounter-${SUFFIX} --overrides "
+{
+  \"spec\": {
+    \"containers\":[
+      {
+        \"args\": [\"${COMMAND}\"],
+        \"stdin\": true,
+        \"tty\": true,
+        \"name\": \"pvc\",
+        \"image\": \"${IMAGE}\",
+        \"volumeMounts\": [
+          ${VOL_MOUNTS}
+        ]
+      }
+    ],
+    \"volumes\": [
+      ${VOLS}
+    ]
+  }
+}
+" -- ${COMMAND}