Initial commit
This commit is contained in:
Fredrik Fornwall
193
app/src/main/java/com/termux/app/TermuxInstaller.java
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193
app/src/main/java/com/termux/app/TermuxInstaller.java
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package com.termux.app;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.InputStreamReader;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipInputStream;
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import android.app.Activity;
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import android.app.AlertDialog;
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import android.app.ProgressDialog;
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import android.content.Context;
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import android.content.DialogInterface;
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import android.content.DialogInterface.OnClickListener;
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import android.content.DialogInterface.OnDismissListener;
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import android.system.Os;
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import android.util.Log;
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import android.util.Pair;
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import com.termux.R;
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import com.termux.terminal.EmulatorDebug;
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/**
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* Install the Termux bootstrap packages if necessary by following the below steps:
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*
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* (1) If $PREFIX already exist, assume that it is correct and be done. Note that this relies on that we do not create a
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* broken $PREFIX folder below.
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*
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* (2) A progress dialog is shown with "Installing..." message and a spinner.
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*
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* (3) A staging folder, $STAGING_PREFIX, is {@link #deleteFolder(File)} if left over from broken installation below.
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*
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* (4) The architecture is determined and an appropriate bootstrap zip url is determined in {@link #determineZipUrl()}.
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*
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* (5) The zip, containing entries relative to the $PREFIX, is is downloaded and extracted by a zip input stream
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* continously encountering zip file entries:
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*
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* (5.1) If the zip entry encountered is SYMLINKS.txt, go through it and remember all symlinks to setup.
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*
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* (5.2) For every other zip entry, extract it into $STAGING_PREFIX and set execute permissions if necessary.
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*/
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final class TermuxInstaller {
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/** Performs setup if necessary. */
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static void setupIfNeeded(final Activity activity, final Runnable whenDone) {
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// Termux can only be run as the primary user (device owner) since only that
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// account has the expected file system paths. Verify that:
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android.os.UserManager um = (android.os.UserManager) activity.getSystemService(Context.USER_SERVICE);
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boolean isPrimaryUser = um.getSerialNumberForUser(android.os.Process.myUserHandle()) == 0;
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if (!isPrimaryUser) {
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new AlertDialog.Builder(activity).setTitle(R.string.bootstrap_error_title).setMessage(R.string.bootstrap_error_not_primary_user_message)
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.setOnDismissListener(new OnDismissListener() {
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@Override
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public void onDismiss(DialogInterface dialog) {
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System.exit(0);
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}
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}).setPositiveButton(android.R.string.ok, null).show();
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return;
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}
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final File PREFIX_FILE = new File(TermuxService.PREFIX_PATH);
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if (PREFIX_FILE.isDirectory()) {
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whenDone.run();
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return;
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}
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final ProgressDialog progress = ProgressDialog.show(activity, null, activity.getString(R.string.bootstrap_installer_body), true, false);
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new Thread() {
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@Override
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public void run() {
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try {
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final String STAGING_PREFIX_PATH = TermuxService.FILES_PATH + "/usr-staging";
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final File STAGING_PREFIX_FILE = new File(STAGING_PREFIX_PATH);
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if (STAGING_PREFIX_FILE.exists()) {
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deleteFolder(STAGING_PREFIX_FILE);
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}
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final byte[] buffer = new byte[8096];
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final List<Pair<String, String>> symlinks = new ArrayList<>(50);
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final URL zipUrl = determineZipUrl();
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try (ZipInputStream zipInput = new ZipInputStream(zipUrl.openStream())) {
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ZipEntry zipEntry;
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while ((zipEntry = zipInput.getNextEntry()) != null) {
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if (zipEntry.getName().equals("SYMLINKS.txt")) {
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BufferedReader symlinksReader = new BufferedReader(new InputStreamReader(zipInput));
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String line;
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while ((line = symlinksReader.readLine()) != null) {
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String[] parts = line.split("←");
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if (parts.length != 2) throw new RuntimeException("Malformed symlink line: " + line);
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String oldPath = parts[0];
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String newPath = STAGING_PREFIX_PATH + "/" + parts[1];
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symlinks.add(Pair.create(oldPath, newPath));
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}
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} else {
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String zipEntryName = zipEntry.getName();
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File targetFile = new File(STAGING_PREFIX_PATH, zipEntryName);
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if (zipEntry.isDirectory()) {
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if (!targetFile.mkdirs()) throw new RuntimeException("Failed to create directory: " + targetFile.getAbsolutePath());
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} else {
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try (FileOutputStream outStream = new FileOutputStream(targetFile)) {
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int readBytes;
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while ((readBytes = zipInput.read(buffer)) != -1)
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outStream.write(buffer, 0, readBytes);
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}
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if (zipEntryName.startsWith("bin/") || zipEntryName.startsWith("libexec") || zipEntryName.startsWith("lib/apt/methods")) {
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Os.chmod(targetFile.getAbsolutePath(), 0700);
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}
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}
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}
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}
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}
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if (symlinks.isEmpty()) throw new RuntimeException("No SYMLINKS.txt encountered");
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for (Pair<String, String> symlink : symlinks) {
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Os.symlink(symlink.first, symlink.second);
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}
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if (!STAGING_PREFIX_FILE.renameTo(PREFIX_FILE)) {
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throw new RuntimeException("Unable to rename staging folder");
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}
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activity.runOnUiThread(new Runnable() {
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@Override
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public void run() {
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whenDone.run();
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}
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});
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} catch (final Exception e) {
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Log.e(EmulatorDebug.LOG_TAG, "Bootstrap error", e);
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activity.runOnUiThread(new Runnable() {
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@Override
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public void run() {
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new AlertDialog.Builder(activity).setTitle(R.string.bootstrap_error_title).setMessage(R.string.bootstrap_error_body)
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.setNegativeButton(R.string.bootstrap_error_abort, new OnClickListener() {
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@Override
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public void onClick(DialogInterface dialog, int which) {
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dialog.dismiss();
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activity.finish();
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}
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}).setPositiveButton(R.string.bootstrap_error_try_again, new OnClickListener() {
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@Override
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public void onClick(DialogInterface dialog, int which) {
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dialog.dismiss();
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TermuxInstaller.setupIfNeeded(activity, whenDone);
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}
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}).show();
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}
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});
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} finally {
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activity.runOnUiThread(new Runnable() {
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@Override
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public void run() {
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progress.dismiss();
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}
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});
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}
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}
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}.start();
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}
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/** Get bootstrap zip url for this systems cpu architecture. */
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static URL determineZipUrl() throws MalformedURLException {
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String arch = System.getProperty("os.arch");
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if (arch.startsWith("arm") || arch.equals("aarch64")) {
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// Handle different arm variants such as armv7l:
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arch = "arm";
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} else if (arch.equals("x86_64")) {
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arch = "i686";
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}
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return new URL("http://apt.termux.com/bootstrap/bootstrap-" + arch + ".zip");
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}
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/** Delete a folder and all its content or throw. */
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static void deleteFolder(File fileOrDirectory) {
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File[] children = fileOrDirectory.listFiles();
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if (children != null) {
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for (File child : children) {
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deleteFolder(child);
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}
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}
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if (!fileOrDirectory.delete()) {
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throw new RuntimeException("Unable to delete " + (fileOrDirectory.isDirectory() ? "directory " : "file ") + fileOrDirectory.getAbsolutePath());
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}
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}
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}
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