package com.termux.app;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.DialogInterface.OnDismissListener;
import android.os.Build;
import android.os.Environment;
import android.os.UserManager;
import android.system.Os;
import android.util.Log;
import android.util.Pair;
import android.view.WindowManager;
import com.termux.R;
import com.termux.terminal.EmulatorDebug;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
/**
* Install the Termux bootstrap packages if necessary by following the below steps:
* <p/>
* (1) If $PREFIX already exist, assume that it is correct and be done. Note that this relies on that we do not create a
* broken $PREFIX folder below.
* <p/>
* (2) A progress dialog is shown with "Installing..." message and a spinner.
* <p/>
* (3) A staging folder, $STAGING_PREFIX, is {@link #deleteFolder(File)} if left over from broken installation below.
* <p/>
* (4) The architecture is determined and an appropriate bootstrap zip url is determined in {@link #determineZipUrl()}.
* <p/>
* (5) The zip, containing entries relative to the $PREFIX, is is downloaded and extracted by a zip input stream
* continously encountering zip file entries:
* <p/>
* (5.1) If the zip entry encountered is SYMLINKS.txt, go through it and remember all symlinks to setup.
* <p/>
* (5.2) For every other zip entry, extract it into $STAGING_PREFIX and set execute permissions if necessary.
*/
final class TermuxInstaller {
/** Performs setup if necessary. */
static void setupIfNeeded(final Activity activity, final Runnable whenDone) {
// Termux can only be run as the primary user (device owner) since only that
// account has the expected file system paths. Verify that:
UserManager um = (UserManager) activity.getSystemService(Context.USER_SERVICE);
boolean isPrimaryUser = um.getSerialNumberForUser(android.os.Process.myUserHandle()) == 0;
if (!isPrimaryUser) {
new AlertDialog.Builder(activity).setTitle(R.string.bootstrap_error_title).setMessage(R.string.bootstrap_error_not_primary_user_message)
.setOnDismissListener(new OnDismissListener() {
@Override
public void onDismiss(DialogInterface dialog) {
System.exit(0);
}
}).setPositiveButton(android.R.string.ok, null).show();
return;
}
final File PREFIX_FILE = new File(TermuxService.PREFIX_PATH);
if (PREFIX_FILE.isDirectory()) {
whenDone.run();
return;
}
final ProgressDialog progress = ProgressDialog.show(activity, null, activity.getString(R.string.bootstrap_installer_body), true, false);
new Thread() {
@Override
public void run() {
try {
final String STAGING_PREFIX_PATH = TermuxService.FILES_PATH + "/usr-staging";
final File STAGING_PREFIX_FILE = new File(STAGING_PREFIX_PATH);
if (STAGING_PREFIX_FILE.exists()) {
deleteFolder(STAGING_PREFIX_FILE);
}
final byte[] buffer = new byte[8096];
final List<Pair<String, String>> symlinks = new ArrayList<>(50);
final URL zipUrl = determineZipUrl();
try (ZipInputStream zipInput = new ZipInputStream(zipUrl.openStream())) {
ZipEntry zipEntry;
while ((zipEntry = zipInput.getNextEntry()) != null) {
if (zipEntry.getName().equals("SYMLINKS.txt")) {
BufferedReader symlinksReader = new BufferedReader(new InputStreamReader(zipInput));
String line;
while ((line = symlinksReader.readLine()) != null) {
String[] parts = line.split("←");
if (parts.length != 2)
throw new RuntimeException("Malformed symlink line: " + line);
String oldPath = parts[0];
String newPath = STAGING_PREFIX_PATH + "/" + parts[1];
symlinks.add(Pair.create(oldPath, newPath));
}
} else {
String zipEntryName = zipEntry.getName();
File targetFile = new File(STAGING_PREFIX_PATH, zipEntryName);
if (zipEntry.isDirectory()) {
if (!targetFile.mkdirs())
throw new RuntimeException("Failed to create directory: " + targetFile.getAbsolutePath());
} else {
try (FileOutputStream outStream = new FileOutputStream(targetFile)) {
int readBytes;
while ((readBytes = zipInput.read(buffer)) != -1)
outStream.write(buffer, 0, readBytes);
}
if (zipEntryName.startsWith("bin/") || zipEntryName.startsWith("libexec") || zipEntryName.startsWith("lib/apt/methods")) {
//noinspection OctalInteger
Os.chmod(targetFile.getAbsolutePath(), 0700);
}
}
}
}
}
if (symlinks.isEmpty())
throw new RuntimeException("No SYMLINKS.txt encountered");
for (Pair<String, String> symlink : symlinks) {
Os.symlink(symlink.first, symlink.second);
}
if (!STAGING_PREFIX_FILE.renameTo(PREFIX_FILE)) {
throw new RuntimeException("Unable to rename staging folder");
}
activity.runOnUiThread(new Runnable() {
@Override
public void run() {
whenDone.run();
}
});
} catch (final Exception e) {
Log.e(EmulatorDebug.LOG_TAG, "Bootstrap error", e);
activity.runOnUiThread(new Runnable() {
@Override
public void run() {
try {
new AlertDialog.Builder(activity).setTitle(R.string.bootstrap_error_title).setMessage(R.string.bootstrap_error_body)
.setNegativeButton(R.string.bootstrap_error_abort, new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
activity.finish();
}
}).setPositiveButton(R.string.bootstrap_error_try_again, new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
TermuxInstaller.setupIfNeeded(activity, whenDone);
}
}).show();
} catch (WindowManager.BadTokenException e) {
// Activity already dismissed - ignore.
}
}
});
} finally {
activity.runOnUiThread(new Runnable() {
@Override
public void run() {
try {
progress.dismiss();
} catch (RuntimeException e) {
// Activity already dismissed - ignore.
}
}
});
}
}
}.start();
}
/** Get bootstrap zip url for this systems cpu architecture. */
static URL determineZipUrl() throws MalformedURLException {
String archName = determineTermuxArchName();
return new URL("https://termux.net/bootstrap/bootstrap-" + archName + ".zip");
}
private static String determineTermuxArchName() {
// Note that we cannot use System.getProperty("os.arch") since that may give e.g. "aarch64"
// while a 64-bit runtime may not be installed (like on the Samsung Galaxy S5 Neo).
// Instead we search through the supported abi:s on the device, see:
// http://developer.android.com/ndk/guides/abis.html
// Note that we search for abi:s in preferred order (the ordering of the
// Build.SUPPORTED_ABIS list) to avoid e.g. installing arm on an x86 system where arm
// emulation is available.
for (String androidArch : Build.SUPPORTED_ABIS) {
switch (androidArch) {
case "arm64-v8a": return "aarch64";
case "armeabi-v7a": return "arm";
case "x86_64": return "x86_64";
case "x86": return "i686";
}
}
throw new RuntimeException("Unable to determine arch from Build.SUPPORTED_ABIS = " +
Arrays.toString(Build.SUPPORTED_ABIS));
}
/** Delete a folder and all its content or throw. */
static void deleteFolder(File fileOrDirectory) {
File[] children = fileOrDirectory.listFiles();
if (children != null) {
for (File child : children) {
deleteFolder(child);
}
}
if (!fileOrDirectory.delete()) {
throw new RuntimeException("Unable to delete " + (fileOrDirectory.isDirectory() ? "directory " : "file ") + fileOrDirectory.getAbsolutePath());
}
}
public static void setupStorageSymlinks(final Context context) {
final String LOG_TAG = "termux-storage";
new Thread() {
public void run() {
try {
File storageDir = new File(TermuxService.HOME_PATH, "storage");
if (storageDir.exists() && !storageDir.delete()) {
Log.e(LOG_TAG, "Could not delete old $HOME/storage");
return;
}
if (!storageDir.mkdirs()) {
Log.e(LOG_TAG, "Unable to mkdirs() for $HOME/storage");
return;
}
File sharedDir = Environment.getExternalStorageDirectory();
Os.symlink(sharedDir.getAbsolutePath(), new File(storageDir, "shared").getAbsolutePath());
File downloadsDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
Os.symlink(downloadsDir.getAbsolutePath(), new File(storageDir, "downloads").getAbsolutePath());
File dcimDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
Os.symlink(dcimDir.getAbsolutePath(), new File(storageDir, "dcim").getAbsolutePath());
File picturesDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
Os.symlink(picturesDir.getAbsolutePath(), new File(storageDir, "pictures").getAbsolutePath());
File musicDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC);
Os.symlink(musicDir.getAbsolutePath(), new File(storageDir, "music").getAbsolutePath());
File moviesDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES);
Os.symlink(moviesDir.getAbsolutePath(), new File(storageDir, "movies").getAbsolutePath());
final File[] dirs = context.getExternalFilesDirs(null);
if (dirs != null && dirs.length > 1) {
for (int i = 1; i < dirs.length; i++) {
File dir = dirs[i];
if (dir == null) continue;
String symlinkName = "external-" + i;
Os.symlink(dir.getAbsolutePath(), new File(storageDir, symlinkName).getAbsolutePath());
}
}
} catch (Exception e) {
Log.e(LOG_TAG, "Error setting up link", e);
}
}
}.start();
}
}