Rework entrypoints (woodpecker-ci#3269)

Co-authored-by: Thomas Anderson <127358482+zc-devs@users.noreply.github.com>
Co-authored-by: 6543 <m.huber@kithara.com>

docs/docs/20-usage/20-workflow-syntax.md

@@ -161,6 +161,9 @@ Only build steps can define commands. You cannot use commands with plugins or se
 
 Allows you to specify the entrypoint for containers. Note that this must be a list of the command and its arguments (e.g. `["/bin/sh", "-c"]`).
 
+If you define [`commands`](#commands), the default entrypoint will be `["/bin/sh", "-c", "echo $CI_SCRIPT | base64 -d | /bin/sh -e"]`.
+You can also use a custom shell with `CI_SCRIPT` (Base64-encoded) if you set `commands`.
+
 ### `environment`
 
 Woodpecker provides the ability to pass environment variables to individual steps.

pipeline/backend/common/script.go

@@ -18,21 +18,19 @@ import (
 	"encoding/base64"
 )
 
-func GenerateContainerConf(commands []string, goos string) (env map[string]string, entry []string, cmd string) {
+func GenerateContainerConf(commands []string, goos string) (env map[string]string, entry []string) {
 	env = make(map[string]string)
 	if goos == "windows" {
 		env["CI_SCRIPT"] = base64.StdEncoding.EncodeToString([]byte(generateScriptWindows(commands)))
 		env["HOME"] = "c:\\root"
 		env["SHELL"] = "powershell.exe"
-		entry = []string{"powershell", "-noprofile", "-noninteractive", "-command"}
-		cmd = "[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($Env:CI_SCRIPT)) | iex"
+		entry = []string{"powershell", "-noprofile", "-noninteractive", "-command", "[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($Env:CI_SCRIPT)) | iex"}
 	} else {
 		env["CI_SCRIPT"] = base64.StdEncoding.EncodeToString([]byte(generateScriptPosix(commands)))
 		env["HOME"] = "/root"
 		env["SHELL"] = "/bin/sh"
-		entry = []string{"/bin/sh", "-c"}
-		cmd = "echo $CI_SCRIPT | base64 -d | /bin/sh -e"
+		entry = []string{"/bin/sh", "-c", "echo $CI_SCRIPT | base64 -d | /bin/sh -e"}
 	}
 
-	return env, entry, cmd
+	return env, entry
 }

pipeline/backend/common/script_test.go

@@ -12,16 +12,14 @@ const (
 )
 
 func TestGenerateContainerConf(t *testing.T) {
-	gotEnv, gotEntry, gotCmd := GenerateContainerConf([]string{"echo hello world"}, "windows")
+	gotEnv, gotEntry := GenerateContainerConf([]string{"echo hello world"}, "windows")
 	assert.Equal(t, windowsScriptBase64, gotEnv["CI_SCRIPT"])
 	assert.Equal(t, "c:\\root", gotEnv["HOME"])
 	assert.Equal(t, "powershell.exe", gotEnv["SHELL"])
-	assert.Equal(t, []string{"powershell", "-noprofile", "-noninteractive", "-command"}, gotEntry)
-	assert.Equal(t, "[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($Env:CI_SCRIPT)) | iex", gotCmd)
-	gotEnv, gotEntry, gotCmd = GenerateContainerConf([]string{"echo hello world"}, "linux")
+	assert.Equal(t, []string{"powershell", "-noprofile", "-noninteractive", "-command", "[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($Env:CI_SCRIPT)) | iex"}, gotEntry)
+	gotEnv, gotEntry = GenerateContainerConf([]string{"echo hello world"}, "linux")
 	assert.Equal(t, posixScriptBase64, gotEnv["CI_SCRIPT"])
 	assert.Equal(t, "/root", gotEnv["HOME"])
 	assert.Equal(t, "/bin/sh", gotEnv["SHELL"])
-	assert.Equal(t, []string{"/bin/sh", "-c"}, gotEntry)
-	assert.Equal(t, "echo $CI_SCRIPT | base64 -d | /bin/sh -e", gotCmd)
+	assert.Equal(t, []string{"/bin/sh", "-c", "echo $CI_SCRIPT | base64 -d | /bin/sh -e"}, gotEntry)
 }

pipeline/backend/docker/convert.go

@@ -45,16 +45,15 @@ func (e *docker) toConfig(step *types.Step) *container.Config {
 	configEnv := make(map[string]string)
 	maps.Copy(configEnv, step.Environment)
 
-	if len(step.Commands) != 0 {
-		env, entry, cmd := common.GenerateContainerConf(step.Commands, e.info.OSType)
+	if len(step.Commands) > 0 {
+		env, entry := common.GenerateContainerConf(step.Commands, e.info.OSType)
 		for k, v := range env {
 			configEnv[k] = v
 		}
-		if len(step.Entrypoint) > 0 {
-			entry = step.Entrypoint
-		}
 		config.Entrypoint = entry
-		config.Cmd = []string{cmd}
+	}
+	if len(step.Entrypoint) > 0 {
+		config.Entrypoint = step.Entrypoint
 	}
 
 	if len(configEnv) != 0 {

pipeline/backend/docker/convert_test.go

@@ -105,8 +105,7 @@ func TestToConfigSmall(t *testing.T) {
 	assert.EqualValues(t, &container.Config{
 		AttachStdout: true,
 		AttachStderr: true,
-		Cmd:          []string{"echo $CI_SCRIPT | base64 -d | /bin/sh -e"},
-		Entrypoint:   []string{"/bin/sh", "-c"},
+		Entrypoint:   []string{"/bin/sh", "-c", "echo $CI_SCRIPT | base64 -d | /bin/sh -e"},
 		Labels: map[string]string{
 			"wp_step": "test",
 			"wp_uuid": "09238932",
@@ -163,8 +162,7 @@ func TestToConfigFull(t *testing.T) {
 		WorkingDir:   "/src/abc",
 		AttachStdout: true,
 		AttachStderr: true,
-		Cmd:          []string{"echo $CI_SCRIPT | base64 -d | /bin/sh -e"},
-		Entrypoint:   []string{"/bin/sh", "-c"},
+		Entrypoint:   []string{"/bin/sh", "-c", "echo $CI_SCRIPT | base64 -d | /bin/sh -e"},
 		Labels: map[string]string{
 			"wp_step": "test",
 			"wp_uuid": "09238932",

pipeline/backend/kubernetes/pod.go

@@ -147,15 +147,14 @@ func podContainer(step *types.Step, podName, goos string, options BackendOptions
 		container.ImagePullPolicy = v1.PullAlways
 	}
 
-	if len(step.Commands) != 0 {
-		scriptEnv, command, args := common.GenerateContainerConf(step.Commands, goos)
-		if len(step.Entrypoint) > 0 {
-			command = step.Entrypoint
-		}
+	if len(step.Commands) > 0 {
+		scriptEnv, command := common.GenerateContainerConf(step.Commands, goos)
 		container.Command = command
-		container.Args = []string{args}
 		maps.Copy(step.Environment, scriptEnv)
 	}
+	if len(step.Entrypoint) > 0 {
+		container.Command = step.Entrypoint
+	}
 
 	container.Env = mapToEnvVars(step.Environment)
 

pipeline/backend/kubernetes/pod_test.go

@@ -90,9 +90,7 @@ func TestTinyPod(t *testing.T) {
 					"image": "gradle:8.4.0-jdk21",
 					"command": [
 						"/bin/sh",
-						"-c"
-					],
-					"args": [
+						"-c",
 						"echo $CI_SCRIPT | base64 -d | /bin/sh -e"
 					],
 					"workingDir": "/woodpecker/src",
@@ -183,9 +181,6 @@ func TestFullPod(t *testing.T) {
 						"/bin/sh",
 						"-c"
 					],
-					"args": [
-						"echo $CI_SCRIPT | base64 -d | /bin/sh -e"
-					],
 					"workingDir": "/woodpecker/src",
 					"ports": [
 						{
@@ -415,3 +410,49 @@ func TestPodPrivilege(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, true, *pod.Spec.SecurityContext.RunAsNonRoot)
 }
+
+func TestScratchPod(t *testing.T) {
+	expected := `
+	{
+		"metadata": {
+			"name": "wp-01he8bebctabr3kgk0qj36d2me-0",
+			"namespace": "woodpecker",
+			"creationTimestamp": null,
+			"labels": {
+				"step": "curl-google"
+			}
+		},
+		"spec": {
+			"containers": [
+				{
+					"name": "wp-01he8bebctabr3kgk0qj36d2me-0",
+					"image": "quay.io/curl/curl",
+					"command": [
+						"/usr/bin/curl",
+						"-v",
+						"google.com"
+					],
+					"resources": {}
+				}
+			],
+			"restartPolicy": "Never"
+		},
+		"status": {}
+	}`
+
+	pod, err := mkPod(&types.Step{
+		Name:       "curl-google",
+		Image:      "quay.io/curl/curl",
+		Entrypoint: []string{"/usr/bin/curl", "-v", "google.com"},
+	}, &config{
+		Namespace: "woodpecker",
+	}, "wp-01he8bebctabr3kgk0qj36d2me-0", "linux/amd64", BackendOptions{})
+	assert.NoError(t, err)
+
+	podJSON, err := json.Marshal(pod)
+	assert.NoError(t, err)
+
+	ja := jsonassert.New(t)
+	t.Log(string(podJSON))
+	ja.Assertf(string(podJSON), expected)
+}

pipeline/frontend/yaml/linter/schema/.woodpecker/test-step.yaml

@@ -14,6 +14,14 @@ steps:
     image: golang
     commands: go test
 
+  entrypoint:
+    image: alpine
+    entrypoint: ['some_entry', '--some-flag']
+
+  singla-entrypoint:
+    image: alpine
+    entrypoint: some_entry
+
   commands:
     privileged: true
     image: golang

pipeline/frontend/yaml/linter/schema/schema.json

@@ -371,6 +371,21 @@
         },
         "backend_options": {
           "$ref": "#/definitions/step_backend_options"
+        },
+        "entrypoint": {
+          "description": "Defines container entrypoint.",
+          "oneOf": [
+            {
+              "type": "array",
+              "minLength": 1,
+              "items": {
+                "type": "string"
+              }
+            },
+            {
+              "type": "string"
+            }
+          ]
         }
       }
     },