Support custom steps entrypoint (#2985)

Closes https://github.com/woodpecker-ci/woodpecker/issues/278

---------

Co-authored-by: Anbraten <anton@ju60.de>
Co-authored-by: 6543 <6543@obermui.de>

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

@@ -156,6 +156,10 @@ docker run --entrypoint=build.sh golang
 Only build steps can define commands. You cannot use commands with plugins or services.
 :::
 
+### `entrypoint`
+
+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"]`).
+
 ### `environment`
 
 Woodpecker provides the ability to pass environment variables to individual steps.

pipeline/backend/common/script.go

@@ -18,20 +18,20 @@ import (
 	"encoding/base64"
 )
 
-func GenerateContainerConf(commands []string, goos string) (env map[string]string, entry, cmd []string) {
+func GenerateContainerConf(commands []string, goos string) (env map[string]string, entry []string, cmd 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 = []string{"[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($Env:CI_SCRIPT)) | iex"}
+		cmd = "[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($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 = []string{"echo $CI_SCRIPT | base64 -d | /bin/sh -e"}
+		cmd = "echo $CI_SCRIPT | base64 -d | /bin/sh -e"
 	}
 
 	return env, entry, cmd

pipeline/backend/common/script_test.go

@@ -17,11 +17,11 @@ func TestGenerateContainerConf(t *testing.T) {
 	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, []string{"[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($Env:CI_SCRIPT)) | iex"}, gotCmd)
+	assert.Equal(t, "[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($Env:CI_SCRIPT)) | iex", gotCmd)
 	gotEnv, gotEntry, gotCmd = GenerateContainerConf([]string{"echo hello world"}, "linux")
 	assert.Equal(t, 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, []string{"echo $CI_SCRIPT | base64 -d | /bin/sh -e"}, gotCmd)
+	assert.Equal(t, "echo $CI_SCRIPT | base64 -d | /bin/sh -e", gotCmd)
 }

pipeline/backend/docker/convert.go

@@ -47,8 +47,11 @@ func (e *docker) toConfig(step *types.Step) *container.Config {
 		for k, v := range env {
 			configEnv[k] = v
 		}
+		if len(step.Entrypoint) > 0 {
+			entry = step.Entrypoint
+		}
 		config.Entrypoint = entry
-		config.Cmd = cmd
+		config.Cmd = []string{cmd}
 	}
 
 	if len(configEnv) != 0 {

pipeline/backend/kubernetes/pod.go

@@ -129,8 +129,11 @@ func podContainer(step *types.Step, podName, goos string) (v1.Container, error)
 
 	if len(step.Commands) != 0 {
 		scriptEnv, command, args := common.GenerateContainerConf(step.Commands, goos)
+		if len(step.Entrypoint) > 0 {
+			command = step.Entrypoint
+		}
 		container.Command = command
-		container.Args = args
+		container.Args = []string{args}
 		maps.Copy(step.Environment, scriptEnv)
 	}
 

pipeline/backend/kubernetes/pod_test.go

@@ -310,6 +310,7 @@ func TestFullPod(t *testing.T) {
 		Pull:        true,
 		Privileged:  true,
 		Commands:    []string{"go get", "go test"},
+		Entrypoint:  []string{"/bin/sh", "-c"},
 		Volumes:     []string{"woodpecker-cache:/woodpecker/src/cache"},
 		Environment: map[string]string{"CGO": "0"},
 		ExtraHosts:  hostAliases,

pipeline/backend/local/local.go

@@ -146,6 +146,7 @@ func (e *local) StartStep(ctx context.Context, step *types.Step, taskUUID string
 // execCommands use step.Image as shell and run the commands in it
 func (e *local) execCommands(ctx context.Context, step *types.Step, state *workflowState, env []string) error {
 	// Prepare commands
+	// TODO support `entrypoint` from pipeline config
 	args, err := e.genCmdByShell(step.Image, step.Commands)
 	if err != nil {
 		return fmt.Errorf("could not convert commands into args: %w", err)

pipeline/frontend/metadata/const.go

@@ -14,7 +14,7 @@
 
 package metadata
 
-// Event types corresponding to scm hooks.
+// Event types corresponding to forge hooks.
 const (
 	EventPush       = "push"
 	EventPull       = "pull_request"

pipeline/frontend/yaml/compiler/convert.go

@@ -185,6 +185,7 @@ func (c *Compiler) createProcess(container *yaml_types.Container, stepType backe
 		WorkingDir:     workingdir,
 		Environment:    environment,
 		Commands:       container.Commands,
+		Entrypoint:     container.Entrypoint,
 		ExtraHosts:     extraHosts,
 		Volumes:        volumes,
 		Tmpfs:          container.Tmpfs,

pipeline/frontend/yaml/types/container.go

@@ -35,6 +35,7 @@ type (
 	Container struct {
 		BackendOptions BackendOptions     `yaml:"backend_options,omitempty"`
 		Commands       base.StringOrSlice `yaml:"commands,omitempty"`
+		Entrypoint     base.StringOrSlice `yaml:"entrypoint,omitempty"`
 		Detached       bool               `yaml:"detach,omitempty"`
 		Directory      string             `yaml:"directory,omitempty"`
 		Environment    base.SliceOrMap    `yaml:"environment,omitempty"`
@@ -50,7 +51,7 @@ type (
 		Ports          []string           `yaml:"ports,omitempty"`
 		DependsOn      base.StringOrSlice `yaml:"depends_on,omitempty"`
 
-		// Docker Specific
+		// Docker and Kubernetes Specific
 		Privileged bool `yaml:"privileged,omitempty"`
 
 		// Undocumented
@@ -119,7 +120,7 @@ func (c *ContainerList) UnmarshalYAML(value *yaml.Node) error {
 }
 
 func (c *Container) IsPlugin() bool {
-	return len(c.Commands) == 0
+	return len(c.Commands) == 0 && len(c.Entrypoint) == 0
 }
 
 func (c *Container) IsTrustedCloneImage() bool {

pipeline/frontend/yaml/types/container_test.go

@@ -39,6 +39,7 @@ devices:
 directory: example/
 dns: 8.8.8.8
 dns_search: example.com
+entrypoint: [/bin/sh, -c]
 environment:
   - RACK_ENV=development
   - SHOW=true
@@ -86,6 +87,7 @@ func TestUnmarshalContainer(t *testing.T) {
 		Directory:    "example/",
 		DNS:          base.StringOrSlice{"8.8.8.8"},
 		DNSSearch:    base.StringOrSlice{"example.com"},
+		Entrypoint:   []string{"/bin/sh", "-c"},
 		Environment:  base.SliceOrMap{"RACK_ENV": "development", "SHOW": "true"},
 		ExtraHosts:   []string{"somehost:162.242.195.82", "otherhost:50.31.209.229", "ipv6:2001:db8::10"},
 		Image:        "golang:latest",
@@ -308,4 +310,10 @@ func TestIsPlugin(t *testing.T) {
 	assert.False(t, (&Container{
 		Commands: base.StringOrSlice(strslice.StrSlice{"echo 'this is not a plugin'"}),
 	}).IsPlugin())
+	assert.True(t, (&Container{
+		Entrypoint: base.StringOrSlice(strslice.StrSlice{}),
+	}).IsPlugin())
+	assert.False(t, (&Container{
+		Entrypoint: base.StringOrSlice(strslice.StrSlice{"echo 'this is not a plugin'"}),
+	}).IsPlugin())
 }