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Add ShellUtils to define shell related utils since they don't belong …
…in BackgroundJob
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| package com.termux.app.utils; | ||
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| import com.termux.BuildConfig; | ||
| import com.termux.app.TermuxConstants; | ||
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| import java.io.File; | ||
| import java.io.FileInputStream; | ||
| import java.io.IOException; | ||
| import java.lang.reflect.Field; | ||
| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
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| public class ShellUtils { | ||
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| public static String[] buildEnvironment(boolean isFailSafe, String workingDirectory) { | ||
| TermuxConstants.TERMUX_HOME_DIR.mkdirs(); | ||
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| if (workingDirectory == null || workingDirectory.isEmpty()) workingDirectory = TermuxConstants.TERMUX_HOME_DIR_PATH; | ||
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| List<String> environment = new ArrayList<>(); | ||
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| environment.add("TERMUX_VERSION=" + BuildConfig.VERSION_NAME); | ||
| environment.add("TERM=xterm-256color"); | ||
| environment.add("COLORTERM=truecolor"); | ||
| environment.add("HOME=" + TermuxConstants.TERMUX_HOME_DIR_PATH); | ||
| environment.add("PREFIX=" + TermuxConstants.TERMUX_PREFIX_DIR_PATH); | ||
| environment.add("BOOTCLASSPATH=" + System.getenv("BOOTCLASSPATH")); | ||
| environment.add("ANDROID_ROOT=" + System.getenv("ANDROID_ROOT")); | ||
| environment.add("ANDROID_DATA=" + System.getenv("ANDROID_DATA")); | ||
| // EXTERNAL_STORAGE is needed for /system/bin/am to work on at least | ||
| // Samsung S7 - see https://plus.google.com/110070148244138185604/posts/gp8Lk3aCGp3. | ||
| environment.add("EXTERNAL_STORAGE=" + System.getenv("EXTERNAL_STORAGE")); | ||
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| // These variables are needed if running on Android 10 and higher. | ||
| addToEnvIfPresent(environment, "ANDROID_ART_ROOT"); | ||
| addToEnvIfPresent(environment, "DEX2OATBOOTCLASSPATH"); | ||
| addToEnvIfPresent(environment, "ANDROID_I18N_ROOT"); | ||
| addToEnvIfPresent(environment, "ANDROID_RUNTIME_ROOT"); | ||
| addToEnvIfPresent(environment, "ANDROID_TZDATA_ROOT"); | ||
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| if (isFailSafe) { | ||
| // Keep the default path so that system binaries can be used in the failsafe session. | ||
| environment.add("PATH= " + System.getenv("PATH")); | ||
| } else { | ||
| environment.add("LANG=en_US.UTF-8"); | ||
| environment.add("PATH=" + TermuxConstants.TERMUX_BIN_PREFIX_DIR_PATH); | ||
| environment.add("PWD=" + workingDirectory); | ||
| environment.add("TMPDIR=" + TermuxConstants.TERMUX_TMP_PREFIX_DIR_PATH); | ||
| } | ||
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| return environment.toArray(new String[0]); | ||
| } | ||
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| public static void addToEnvIfPresent(List<String> environment, String name) { | ||
| String value = System.getenv(name); | ||
| if (value != null) { | ||
| environment.add(name + "=" + value); | ||
| } | ||
| } | ||
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| public static int getPid(Process p) { | ||
| try { | ||
| Field f = p.getClass().getDeclaredField("pid"); | ||
| f.setAccessible(true); | ||
| try { | ||
| return f.getInt(p); | ||
| } finally { | ||
| f.setAccessible(false); | ||
| } | ||
| } catch (Throwable e) { | ||
| return -1; | ||
| } | ||
| } | ||
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| public static String[] setupProcessArgs(String fileToExecute, String[] arguments) { | ||
| // The file to execute may either be: | ||
| // - An elf file, in which we execute it directly. | ||
| // - A script file without shebang, which we execute with our standard shell $PREFIX/bin/sh instead of the | ||
| // system /system/bin/sh. The system shell may vary and may not work at all due to LD_LIBRARY_PATH. | ||
| // - A file with shebang, which we try to handle with e.g. /bin/foo -> $PREFIX/bin/foo. | ||
| String interpreter = null; | ||
| try { | ||
| File file = new File(fileToExecute); | ||
| try (FileInputStream in = new FileInputStream(file)) { | ||
| byte[] buffer = new byte[256]; | ||
| int bytesRead = in.read(buffer); | ||
| if (bytesRead > 4) { | ||
| if (buffer[0] == 0x7F && buffer[1] == 'E' && buffer[2] == 'L' && buffer[3] == 'F') { | ||
| // Elf file, do nothing. | ||
| } else if (buffer[0] == '#' && buffer[1] == '!') { | ||
| // Try to parse shebang. | ||
| StringBuilder builder = new StringBuilder(); | ||
| for (int i = 2; i < bytesRead; i++) { | ||
| char c = (char) buffer[i]; | ||
| if (c == ' ' || c == '\n') { | ||
| if (builder.length() == 0) { | ||
| // Skip whitespace after shebang. | ||
| } else { | ||
| // End of shebang. | ||
| String executable = builder.toString(); | ||
| if (executable.startsWith("/usr") || executable.startsWith("/bin")) { | ||
| String[] parts = executable.split("/"); | ||
| String binary = parts[parts.length - 1]; | ||
| interpreter = TermuxConstants.TERMUX_BIN_PREFIX_DIR_PATH + "/" + binary; | ||
| } | ||
| break; | ||
| } | ||
| } else { | ||
| builder.append(c); | ||
| } | ||
| } | ||
| } else { | ||
| // No shebang and no ELF, use standard shell. | ||
| interpreter = TermuxConstants.TERMUX_BIN_PREFIX_DIR_PATH + "/sh"; | ||
| } | ||
| } | ||
| } | ||
| } catch (IOException e) { | ||
| // Ignore. | ||
| } | ||
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| List<String> result = new ArrayList<>(); | ||
| if (interpreter != null) result.add(interpreter); | ||
| result.add(fileToExecute); | ||
| if (arguments != null) Collections.addAll(result, arguments); | ||
| return result.toArray(new String[0]); | ||
| } | ||
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| public static String getExecutableBasename(String executable) { | ||
| if(executable == null) return null; | ||
| int lastSlash = executable.lastIndexOf('/'); | ||
| return (lastSlash == -1) ? executable : executable.substring(lastSlash + 1); | ||
| } | ||
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| } |