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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package sdkpath provides functions for locating the Android SDK.
// These functions respect the ANDROID_HOME environment variable, and
// otherwise use the default SDK location.
package sdkpath
import (
"fmt"
"os"
"path/filepath"
"runtime"
"strconv"
"strings"
)
// AndroidHome returns the absolute path of the selected Android SDK,
// if one can be found.
func AndroidHome() (string, error) {
androidHome := os.Getenv("ANDROID_HOME")
if androidHome == "" {
home, err := os.UserHomeDir()
if err != nil {
return "", err
}
switch runtime.GOOS {
case "windows":
// See https://android.googlesource.com/platform/tools/adt/idea/+/85b4bfb7a10ad858a30ffa4003085b54f9424087/native/installer/win/setup_android_studio.nsi#100
androidHome = filepath.Join(home, "AppData", "Local", "Android", "sdk")
case "darwin":
// See https://android.googlesource.com/platform/tools/asuite/+/67e0cd9604379e9663df57f16a318d76423c0aa8/aidegen/lib/ide_util.py#88
androidHome = filepath.Join(home, "Library", "Android", "sdk")
default: // Linux, BSDs, etc.
// See LINUX_ANDROID_SDK_PATH in ide_util.py above.
androidHome = filepath.Join(home, "Android", "Sdk")
}
}
if info, err := os.Stat(androidHome); err != nil {
return "", fmt.Errorf("%w; Android SDK was not found at %s", err, androidHome)
} else if !info.IsDir() {
return "", fmt.Errorf("%s is not a directory", androidHome)
}
return androidHome, nil
}
// AndroidAPIPath returns an android SDK platform directory within the configured SDK.
// If there are multiple platforms that satisfy the minimum version requirement,
// AndroidAPIPath returns the latest one among them.
func AndroidAPIPath(api int) (string, error) {
sdk, err := AndroidHome()
if err != nil {
return "", err
}
sdkDir, err := os.Open(filepath.Join(sdk, "platforms"))
if err != nil {
return "", fmt.Errorf("failed to find android SDK platform: %w", err)
}
defer sdkDir.Close()
fis, err := sdkDir.Readdir(-1)
if err != nil {
return "", fmt.Errorf("failed to find android SDK platform (API level: %d): %w", api, err)
}
var apiPath string
var apiVer int
for _, fi := range fis {
name := fi.Name()
if !strings.HasPrefix(name, "android-") {
continue
}
n, err := strconv.Atoi(name[len("android-"):])
if err != nil || n < api {
continue
}
p := filepath.Join(sdkDir.Name(), name)
_, err = os.Stat(filepath.Join(p, "android.jar"))
if err == nil && apiVer < n {
apiPath = p
apiVer = n
}
}
if apiVer == 0 {
return "", fmt.Errorf("failed to find android SDK platform (API level: %d) in %s",
api, sdkDir.Name())
}
return apiPath, nil
}
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