Add kubectl kubernetes client wrapper

Will connect to a running "k3s" or "k8s" instance.

Similar to other wrappers, but uses conf not sock.

Signed-off-by: Anders F Björklund <anders.f.bjorklund@gmail.com>

Makefile

@@ -46,6 +46,7 @@ binaries: clean \
 	_output/bin/apptainer.lima \
 	_output/bin/docker.lima \
 	_output/bin/podman.lima \
+	_output/bin/kubectl.lima \
 	_output/share/lima/lima-guestagent.Linux-x86_64 \
 	_output/share/lima/lima-guestagent.Linux-aarch64 \
 	_output/share/lima/lima-guestagent.Linux-riscv64
@@ -87,6 +88,10 @@ _output/bin/podman.lima: ./cmd/podman.lima
 	@mkdir -p _output/bin
 	cp -a $^ $@
 
+_output/bin/kubectl.lima: ./cmd/kubectl.lima
+	@mkdir -p _output/bin
+	cp -a $^ $@
+
 .PHONY: _output/bin/limactl$(exe)
 _output/bin/limactl$(exe):
 	# The hostagent must be compiled with CGO_ENABLED=1 so that net.LookupIP() in the DNS server
@@ -132,6 +137,7 @@ uninstall:
 		"$(DEST)/bin/apptainer.lima" \
 		"$(DEST)/bin/docker.lima" \
 		"$(DEST)/bin/podman.lima" \
+		"$(DEST)/bin/kubectl.lima" \
 		"$(DEST)/share/lima" "$(DEST)/share/doc/lima"
 	if [ "$$(readlink "$(DEST)/bin/nerdctl")" = "nerdctl.lima" ]; then rm "$(DEST)/bin/nerdctl"; fi
 	if [ "$$(readlink "$(DEST)/bin/apptainer")" = "apptainer.lima" ]; then rm "$(DEST)/bin/apptainer"; fi

cmd/kubectl.lima

@@ -0,0 +1,27 @@
+#!/bin/sh
+set -eu
+: "${LIMA_INSTANCE:=}"
+: "${KUBECTL:=kubectl}"
+
+if [ -z "$LIMA_INSTANCE" ]; then
+  if [ "$(limactl ls -f '{{.Status}}' k3s 2>/dev/null)" = "Running" ]; then
+    LIMA_INSTANCE=k3s
+  elif [ "$(limactl ls -f '{{.Status}}' k8s 2>/dev/null)" = "Running" ]; then
+    LIMA_INSTANCE=k8s
+  else
+    echo "no running instance found, run \`limactl start\` to start an instance" >&2
+    exit 1
+  fi
+elif [ "$(limactl ls -q "$LIMA_INSTANCE" 2>/dev/null)" != "$LIMA_INSTANCE" ]; then
+  echo "instance \"$LIMA_INSTANCE\" does not exist, run \`limactl start --name=$LIMA_INSTANCE\` to create a new instance" >&2
+  exit 1
+fi
+KUBECTL=$(command -v "$KUBECTL" || true)
+if [ -n "$KUBECTL" ]; then
+  KUBECONFIG=$(limactl list "$LIMA_INSTANCE" --format '{{.Dir}}/conf/kubeconfig.yaml')
+  export KUBECONFIG
+  exec "$KUBECTL" "$@"
+else
+  export LIMA_INSTANCE
+  exec lima sudo kubectl "$@"
+fi