Allow configuring a name for the archived binary

This will default to the existing behavior: using the name of the currently running executable.

Fixes #42

selfupdate/update.go

@@ -15,9 +15,13 @@ import (
 	"github.com/inconshreveable/go-update"
 )
 
-func uncompressAndUpdate(src io.Reader, assetURL, cmdPath string) error {
-	_, cmd := filepath.Split(cmdPath)
-	asset, err := UncompressCommand(src, assetURL, cmd)
+func uncompressAndUpdate(src io.Reader, assetURL, cmdPath string, binaryName string) error {
+	if binaryName == "" {
+		_, binaryName = filepath.Split(cmdPath)
+	} else if runtime.GOOS == "windows" {
+		binaryName += ".exe"
+	}
+	asset, err := UncompressCommand(src, assetURL, binaryName)
 	if err != nil {
 		return err
 	}
@@ -76,7 +80,7 @@ func (up *Updater) UpdateTo(rel *Release, cmdPath string) error {
 	}
 
 	if up.validator == nil {
-		return uncompressAndUpdate(bytes.NewReader(data), rel.AssetURL, cmdPath)
+		return uncompressAndUpdate(bytes.NewReader(data), rel.AssetURL, cmdPath, up.binaryName)
 	}
 
 	validationSrc, validationRedirectURL, err := up.api.Repositories.DownloadReleaseAsset(up.apiCtx, rel.RepoOwner, rel.RepoName, rel.ValidationAssetID, &client)
@@ -102,7 +106,7 @@ func (up *Updater) UpdateTo(rel *Release, cmdPath string) error {
 		return fmt.Errorf("Failed validating asset content: %v", err)
 	}
 
-	return uncompressAndUpdate(bytes.NewReader(data), rel.AssetURL, cmdPath)
+	return uncompressAndUpdate(bytes.NewReader(data), rel.AssetURL, cmdPath, up.binaryName)
 }
 
 // UpdateCommand updates a given command binary to the latest version.
@@ -165,7 +169,7 @@ func UpdateTo(assetURL, cmdPath string) error {
 		return err
 	}
 	defer src.Close()
-	return uncompressAndUpdate(src, assetURL, cmdPath)
+	return uncompressAndUpdate(src, assetURL, cmdPath, up.binaryName)
 }
 
 // UpdateCommand updates a given command binary to the latest version.

selfupdate/update_test.go

@@ -11,16 +11,34 @@ import (
 	"github.com/blang/semver"
 )
 
-func setupTestBinary() {
-	if err := exec.Command("go", "build", "./testdata/github-release-test/").Run(); err != nil {
+func setupTestBinary(name ...string) {
+	var options []string
+	var output string
+	if len(name) == 0 {
+		options = []string{"build", "./testdata/github-release-test/"}
+	} else {
+		output = name[0]
+		if runtime.GOOS == "windows" {
+			output += ".exe"
+		}
+		options = []string{"build", "-o", output, "./testdata/github-release-test/"}
+	}
+
+	if err := exec.Command("go", options...).Run(); err != nil {
 		panic(err)
 	}
 }
 
-func teardownTestBinary() {
-	bin := "github-release-test"
+func teardownTestBinary(name ...string) {
+	var bin string
+	if len(name) == 0 {
+		bin = "github-release-test"
+	} else {
+		bin = name[0]
+	}
+
 	if runtime.GOOS == "windows" {
-		bin = "github-release-test.exe"
+		bin += ".exe"
 	}
 	if err := os.Remove(bin); err != nil {
 		panic(err)
@@ -64,6 +82,41 @@ func TestUpdateCommand(t *testing.T) {
 	}
 }
 
+func TestUpdateWithDifferentBinaryName(t *testing.T) {
+	setupTestBinary("gh-release-test")
+	defer teardownTestBinary("gh-release-test")
+	latest := semver.MustParse("1.2.3")
+	prev := semver.MustParse("1.2.2")
+
+	_, err := UpdateCommand("gh-release-test", prev, "rhysd-test/test-release-zip")
+	if err == nil {
+		t.Fatal("Error should occur for broken package")
+	}
+	if !strings.Contains(err.Error(), "the command is not found") {
+		t.Fatal("Unexpected error:", err)
+	}
+
+	up, err := NewUpdater(Config{BinaryName: "github-release-test", Filters: []string{"github-release-test"}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	rel, err := up.UpdateCommand("gh-release-test", prev, "rhysd-test/test-release-zip")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if rel.Version.NE(latest) {
+		t.Error("Version is not latest", rel.Version)
+	}
+	bytes, err := exec.Command(filepath.FromSlash("./gh-release-test")).Output()
+	if err != nil {
+		t.Fatal("Failed to run test binary after update:", err)
+	}
+	out := string(bytes)
+	if out != "v1.2.3\n" {
+		t.Error("Output from test binary after update is unexpected:", out)
+	}
+}
+
 func TestUpdateViaSymlink(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skip tests in short mode.")

selfupdate/updater.go

@@ -15,10 +15,11 @@ import (
 // Updater is responsible for managing the context of self-update.
 // It contains GitHub client and its context.
 type Updater struct {
-	api       *github.Client
-	apiCtx    context.Context
-	validator Validator
-	filters   []*regexp.Regexp
+	api        *github.Client
+	apiCtx     context.Context
+	validator  Validator
+	filters    []*regexp.Regexp
+	binaryName string
 }
 
 // Config represents the configuration of self-update.
@@ -37,6 +38,10 @@ type Config struct {
 	// An asset is selected if it matches any of those, in addition to the regular tag, os, arch, extensions.
 	// Please make sure that your filter(s) uniquely match an asset.
 	Filters []string
+
+	// BinaryName represents the name of the binary extracted from the archive downloaded from GitHub.
+	// If unset, the current executable's name will be used to match.
+	BinaryName string
 }
 
 func newHTTPClient(ctx context.Context, token string) *http.Client {
@@ -71,7 +76,7 @@ func NewUpdater(config Config) (*Updater, error) {
 
 	if config.EnterpriseBaseURL == "" {
 		client := github.NewClient(hc)
-		return &Updater{api: client, apiCtx: ctx, validator: config.Validator, filters: filtersRe}, nil
+		return &Updater{api: client, apiCtx: ctx, validator: config.Validator, filters: filtersRe, binaryName: config.BinaryName}, nil
 	}
 
 	u := config.EnterpriseUploadURL
@@ -82,7 +87,8 @@ func NewUpdater(config Config) (*Updater, error) {
 	if err != nil {
 		return nil, err
 	}
-	return &Updater{api: client, apiCtx: ctx, validator: config.Validator, filters: filtersRe}, nil
+
+	return &Updater{api: client, apiCtx: ctx, validator: config.Validator, filters: filtersRe, binaryName: config.BinaryName}, nil
 }
 
 // DefaultUpdater creates a new updater instance with default configuration.