Added option detach and unit tests

Makefile

@@ -15,12 +15,15 @@ else
     OS_UNAME := $(shell uname -s)
 endif
 
-.PHONY: build sign checksum clean mk-output-dir
+.PHONY: build sign checksum clean mk-output-dir test
 
-all: $(RELEASE_FILE_PATH) $(CHECKSUM_FILE_PATH)
+all: test $(RELEASE_FILE_PATH) $(CHECKSUM_FILE_PATH)
 
 build: $(RELEASE_FILE_PATH)
 
+test:
+	bats test/
+
 checksum: $(CHECKSUM_FILE_PATH)
 
 sign: $(SIG_FILE_PATH)

bin/kubectl-tmux_exec

@@ -76,6 +76,7 @@ Options:
   -t, --tty=true: Stdin is a TTY (deprecated, since it's enabled by default)
   -l, --selector: Selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2)
   -f, --file: Read pod names line-by-line from a file
+  -d, --detach=false: Make the Tmux session detached
   --remain-on-exit=false: Remain Tmux window on exit
   --select-layout=tiled: One of the five Tmux preset layouts: even-horizontal, even-vertical, main-horizontal,
                          main-vertical, or tiled.
@@ -136,8 +137,8 @@ function array_contains() {
 
 function main() {
     local opts
-    opts=$(ggetopt -o hitc:l:f:"$(printf '%s:' "${KUBECTL_SHORT_OPTS[@]}")" --long \
-        help,stdin,tty,container:,selector:,remain-on-exit,select-layout:,file:,"$(printf '%s:,' "${KUBECTL_LONG_OPTS[@]}")","$(printf '%s,' "${KUBECTL_NOARG_LONG_OPTS[@]}")" -- "$@")
+    opts=$(ggetopt -o hitdc:l:f:"$(printf '%s:' "${KUBECTL_SHORT_OPTS[@]}")" --long \
+        help,stdin,tty,detach,container:,selector:,remain-on-exit,select-layout:,file:,"$(printf '%s:,' "${KUBECTL_LONG_OPTS[@]}")","$(printf '%s,' "${KUBECTL_NOARG_LONG_OPTS[@]}")" -- "$@")
     eval set -- $opts
 
     local selector
@@ -146,6 +147,7 @@ function main() {
     local remain_on_exit=0
     local tmux_layout='tiled'
     local pod_list_file
+    local tmux_detach=0
     while [[ $# -gt 0 ]]; do
         local opt="$1"
         case "${opt}" in
@@ -167,6 +169,9 @@ function main() {
                 shift
                 selector="$1"
                 ;;
+            -d|--detach)
+                tmux_detach=1
+                ;;
             --remain-on-exit)
                 remain_on_exit=1
                 ;;
@@ -268,7 +273,11 @@ function main() {
     for pod in "${pods[@]}"; do
         local cmd="kubectl ${kubectl_opts[@]:-} exec ${kubectl_exec_opts} ${pod} -- ${exec_cmd_str}"
         if [[ "${#tmux_commands[@]}" -eq 0 ]]; then
-            tmux_commands+=('new-session' "${cmd}" ';')
+            if [[ "${tmux_detach}" -eq 0 ]]; then
+                tmux_commands+=('new-session' "${cmd}" ';')
+            else
+                tmux_commands+=('new-session' '-d' "${cmd}" ';')
+            fi
         else
             tmux_commands+=('split-window' "${cmd}" ';')
         fi

test/basic.bats

@@ -0,0 +1,11 @@
+#!/usr/bin/env bats
+
+@test "Print usage" {
+    bin/kubectl-tmux_exec --help
+    [ $? -eq 0 ]
+}
+
+@test "Use as a plugin" {
+    kubectl tmux-exec --help
+    [ $? -eq 0 ]
+}

test/exec-one-pod.bats

@@ -0,0 +1,65 @@
+#!/usr/bin/env bats
+
+load test-helper
+
+readonly POD_NAME='alpine'
+readonly POD_APP_LABEL='alpine'
+
+function setup() {
+    kubectl apply -f - << EOF
+apiVersion: v1
+kind: Pod
+metadata:
+  name: ${POD_NAME}
+  labels:
+    app: ${POD_APP_LABEL}
+spec:
+  containers:
+  - name: alpine
+    image: alpine
+    command:
+    - sleep
+    - infinite
+EOF
+    local pod_status=''
+    local retries=30
+    while [[ "${pod_status}" != 'Running' ]]; do
+        sleep 1
+        pod_status="$(kubectl get pods "${POD_NAME}" -o custom-columns=':status.phase' --no-headers)"
+        echo "The pod status is ${pod_status}."
+        (( --retries )) || {
+            echo 'Timed out.'
+            exit 1
+        }
+    done
+}
+
+function teardown() {
+    kubectl delete pod "${POD_NAME}"
+    sleep 1
+}
+
+@test "Exec one pod by label" {
+    local written='foobar-label'
+    bin/kubectl-tmux_exec -d -l app="${POD_APP_LABEL}" -- sh -c "echo ${written} > /tmp/foobar"
+
+    wait_until_no_sessions
+
+    local file_content=
+    file_content="$(kubectl exec "${POD_NAME}" cat /tmp/foobar)"
+
+    [ "${file_content}" == "${written}" ]
+}
+
+@test "Exec one pod by file" {
+    # set -x
+    local written='foobar-file'
+    bin/kubectl-tmux_exec -d -f - -- sh -c "echo ${written} > /tmp/foobar" <<< "${POD_NAME}"
+
+    wait_until_no_sessions
+
+    local file_content
+    file_content="$(kubectl exec "${POD_NAME}" cat /tmp/foobar)"
+
+    [ "${file_content}" == "${written}" ]
+}

test/test-helper.bash

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+function wait_until_no_sessions() {
+    local retries=30
+    while tmux ls 2>&1 >/dev/null; do
+        (( --retries )) || {
+            echo 'Timed out.'
+            return 1
+        }
+        sleep 1
+    done
+}