Rename executor to execd

Signed-off-by: Sambhav Kothari <skothari44@bloomberg.net>

exec_d.go

@@ -24,17 +24,17 @@ import (
 	"github.com/buildpacks/libcnb/internal"
 )
 
-//go:generate mockery --name Executor --case=underscore
+//go:generate mockery --name ExecD --case=underscore
 
-// Executor describes an interface for types that follow the Exec.d specification.
+// ExecD describes an interface for types that follow the Exec.d specification.
 // It should return a map of environment variables and their values as output.
-type Executor interface {
+type ExecD interface {
 	Execute() (map[string]string, error)
 }
 
-// ExecD is called by the main function of a buildpack's execd binary, encompassing multiple execd
+// RunExecD is called by the main function of a buildpack's execd binary, encompassing multiple execd
 // executors in one binary.
-func ExecD(executors map[string]Executor, options ...Option) {
+func RunExecD(execDMap map[string]ExecD, options ...Option) {
 	config := Config{
 		arguments:   os.Args,
 		execdWriter: internal.NewExecDWriter(),
@@ -52,7 +52,7 @@ func ExecD(executors map[string]Executor, options ...Option) {
 	}
 
 	c := filepath.Base(config.arguments[0])
-	e, ok := executors[c]
+	e, ok := execDMap[c]
 	if !ok {
 		config.exitHandler.Error(fmt.Errorf("unsupported command %s", c))
 		return

exec_d_test.go

@@ -46,7 +46,7 @@ func testExecD(t *testing.T, context spec.G, it spec.S) {
 	})
 
 	it("encounters the wrong number of arguments", func() {
-		libcnb.ExecD(map[string]libcnb.Executor{},
+		libcnb.RunExecD(map[string]libcnb.ExecD{},
 			libcnb.WithArguments([]string{}),
 			libcnb.WithExitHandler(exitHandler),
 		)
@@ -55,35 +55,35 @@ func testExecD(t *testing.T, context spec.G, it spec.S) {
 	})
 
 	it("encounters an unsupported execd binary name", func() {
-		libcnb.ExecD(map[string]libcnb.Executor{},
+		libcnb.RunExecD(map[string]libcnb.ExecD{},
 			libcnb.WithArguments([]string{"/dne"}),
 			libcnb.WithExitHandler(exitHandler),
 		)
 
 		Expect(exitHandler.Calls[0].Arguments.Get(0)).To(MatchError("unsupported command dne"))
 	})
 
-	it("calls the appropriate executor for a given execd binary", func() {
-		executor1 := &mocks.Executor{}
-		executor2 := &mocks.Executor{}
-		executor1.On("Execute", mock.Anything).Return(map[string]string{}, nil)
+	it("calls the appropriate execd for a given execd invoker binary", func() {
+		execd1 := &mocks.ExecD{}
+		execd2 := &mocks.ExecD{}
+		execd1.On("Execute", mock.Anything).Return(map[string]string{}, nil)
 
-		libcnb.ExecD(map[string]libcnb.Executor{"executor1": executor1, "executor2": executor2},
-			libcnb.WithArguments([]string{"executor1"}),
+		libcnb.RunExecD(map[string]libcnb.ExecD{"execd1": execd1, "execd2": execd2},
+			libcnb.WithArguments([]string{"execd1"}),
 			libcnb.WithExitHandler(exitHandler),
 			libcnb.WithExecDWriter(execdWriter),
 		)
 
-		Expect(executor1.Calls).To(HaveLen(1))
-		Expect(executor2.Calls).To(BeEmpty())
+		Expect(execd1.Calls).To(HaveLen(1))
+		Expect(execd2.Calls).To(BeEmpty())
 	})
 
-	it("calls exitHandler with the error from the executor", func() {
-		e := &mocks.Executor{}
+	it("calls exitHandler with the error from the execd", func() {
+		e := &mocks.ExecD{}
 		err := fmt.Errorf("example error")
 		e.On("Execute", mock.Anything).Return(nil, err)
 
-		libcnb.ExecD(map[string]libcnb.Executor{"e": e},
+		libcnb.RunExecD(map[string]libcnb.ExecD{"e": e},
 			libcnb.WithArguments([]string{"/bin/e"}),
 			libcnb.WithExitHandler(exitHandler),
 			libcnb.WithExecDWriter(execdWriter),
@@ -95,11 +95,11 @@ func testExecD(t *testing.T, context spec.G, it spec.S) {
 	})
 
 	it("calls execdWriter.write with the appropriate input", func() {
-		e := &mocks.Executor{}
+		e := &mocks.ExecD{}
 		o := map[string]string{"test": "test"}
 		e.On("Execute", mock.Anything).Return(o, nil)
 
-		libcnb.ExecD(map[string]libcnb.Executor{"e": e},
+		libcnb.RunExecD(map[string]libcnb.ExecD{"e": e},
 			libcnb.WithArguments([]string{"/bin/e"}),
 			libcnb.WithExitHandler(exitHandler),
 			libcnb.WithExecDWriter(execdWriter),
@@ -112,12 +112,12 @@ func testExecD(t *testing.T, context spec.G, it spec.S) {
 		Expect(execdWriter.Calls[0].Arguments[0]).To(Equal(o))
 	})
 
-	it("calls exitHandler with the error from the executor", func() {
-		e := &mocks.Executor{}
+	it("calls exitHandler with the error from the execd", func() {
+		e := &mocks.ExecD{}
 		err := fmt.Errorf("example error")
 		e.On("Execute", mock.Anything).Return(nil, err)
 
-		libcnb.ExecD(map[string]libcnb.Executor{"e": e},
+		libcnb.RunExecD(map[string]libcnb.ExecD{"e": e},
 			libcnb.WithArguments([]string{"/bin/e"}),
 			libcnb.WithExitHandler(exitHandler),
 			libcnb.WithExecDWriter(execdWriter),