cmd/gogio: [android] allow custom signature-key

That change makes possible to provide custom PKCS#12 (JKS/PFX) using `-signkey` and the password with `-signpass`.

By default the gogio will use the `debug.keystore`, if no key is provided.

Signed-off-by: Inkeliz <inkeliz@inkeliz.com>

cmd/gogio/androidbuild.go

@@ -548,37 +548,18 @@ func signAPK(tmpDir string, tools *androidTools, bi *buildInfo) error {
 	if err != nil {
 		return err
 	}
-	home, err := os.UserHomeDir()
-	if err != nil {
-		return err
-	}
-	keystore := filepath.Join(home, ".android", "debug.keystore")
-	if _, err := os.Stat(keystore); err != nil {
-		keystore = filepath.Join(tmpDir, "sign.keystore")
-		keytool, err := findKeytool()
-		if err != nil {
-			return err
-		}
-		_, err = runCmd(exec.Command(
-			keytool,
-			"-genkey",
-			"-keystore", keystore,
-			"-storepass", "android",
-			"-alias", "android",
-			"-keyalg", "RSA", "-keysize", "2048",
-			"-validity", "10000",
-			"-noprompt",
-			"-dname", "CN=android",
-		))
-		if err != nil {
+
+	if bi.key == "" {
+		if err := defaultAndroidKeystore(tmpDir, bi); err != nil {
 			return err
 		}
 	}
+
 	_, err = runCmd(exec.Command(
 		filepath.Join(tools.buildtools, "apksigner"),
 		"sign",
-		"--ks-pass", "pass:android",
-		"--ks", keystore,
+		"--ks-pass", "pass:"+bi.password,
+		"--ks", bi.key,
 		apkFile,
 	))
 	if err != nil {
@@ -587,6 +568,39 @@ func signAPK(tmpDir string, tools *androidTools, bi *buildInfo) error {
 	return nil
 }
 
+func defaultAndroidKeystore(tmpDir string, bi *buildInfo) error {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return err
+	}
+
+	// Use debug.keystore, if exists.
+	bi.key = filepath.Join(home, ".android", "debug.keystore")
+	bi.password = "android"
+	if _, err := os.Stat(bi.key); err == nil {
+		return nil
+	}
+
+	// Generate new key.
+	bi.key = filepath.Join(tmpDir, "sign.keystore")
+	keytool, err := findKeytool()
+	if err != nil {
+		return err
+	}
+	_, err = runCmd(exec.Command(
+		keytool,
+		"-genkey",
+		"-keystore", bi.key,
+		"-storepass", bi.password,
+		"-alias", "android",
+		"-keyalg", "RSA", "-keysize", "2048",
+		"-validity", "10000",
+		"-noprompt",
+		"-dname", "CN=android",
+	))
+	return err
+}
+
 func findNDK(androidHome string) (string, error) {
 	ndks, err := filepath.Glob(filepath.Join(androidHome, "ndk", "*"))
 	if err != nil {

cmd/gogio/build_info.go

@@ -23,6 +23,8 @@ type buildInfo struct {
 	tags     string
 	target   string
 	version  int
+	key      string
+	password string
 }
 
 func newBuildInfo(pkgPath string) (*buildInfo, error) {
@@ -47,6 +49,8 @@ func newBuildInfo(pkgPath string) (*buildInfo, error) {
 		tags:     *extraTags,
 		target:   *target,
 		version:  *version,
+		key:      *signKey,
+		password: *signPass,
 	}
 	return bi, nil
 }

cmd/gogio/help.go

@@ -59,4 +59,8 @@ The -work flag prints the path to the working directory and suppress
 its deletion.
 
 The -x flag will print all the external commands executed by the gogio tool.
+
+The -signkey flag specifies the path of the keystore, used for signing Android apk files.
+
+The -signpass flag specifies the password of the keystore, ignored if -signkey is not provided.
 `

cmd/gogio/main.go

@@ -34,7 +34,9 @@ var (
 	linkMode      = flag.String("linkmode", "", "set the -linkmode flag of the go tool")
 	extraLdflags  = flag.String("ldflags", "", "extra flags to the Go linker")
 	extraTags     = flag.String("tags", "", "extra tags to the Go tool")
-	iconPath      = flag.String("icon", "", "Specify an icon for iOS and Android")
+	iconPath      = flag.String("icon", "", "specify an icon for iOS and Android")
+	signKey       = flag.String("signkey", "", "specify the path of the keystore to be used to sign Android apk files.")
+	signPass      = flag.String("signpass", "", "specify the password to decrypt the signkey.")
 )
 
 func main() {