From 1149d4291f984d57159a73c4f48bf31d0a726614 Mon Sep 17 00:00:00 2001
From: agnostic-apollo <agnosticapollo@gmail.com>
Date: Fri, 28 Mar 2025 11:30:08 +0500
Subject: [PATCH] Added: Export additional primary `TERMUX_*` scoped shell
 environment variables

- TERMUX__APPS_DIR
- TERMUX__ROOTFS
- TERMUX__HOME
- TERMUX__PREFIX
- TERMUX_APP__LEGACY_DATA_DIR (Expected legacy app data directory path for the `com.termux` app, mainly accessible on primary user `0` and is a symlink/bind mount to/from `TERMUX_APP__DATA_DIR`)
- TERMUX_APP__BUILD_DATA_DIR (App data directory path used by `termux-packages` `properties.sh` while building packages and `TermuxConstants.java` while building Termux app)

`TERMUX_APP__DATA_DIR` variable already exported is for the actual app data directory path assigned by Android for the `com.termux` app returned by `ApplicationInfo`.

This is also required for `libtermux-exec-*-ld-preload.so` `$LD_PRELOAD` library as well for `termux-exec` version `>= 2.0.0`.

- https://github.com/termux/termux-exec-package/commit/db738a11

See also https://github.com/termux/termux-packages/blob/96eefda/scripts/properties.sh
---
 .../environment/TermuxAppShellEnvironment.java     |  5 ++++-
 .../environment/TermuxShellEnvironment.java        | 14 ++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/termux-shared/src/main/java/com/termux/shared/termux/shell/command/environment/TermuxAppShellEnvironment.java b/termux-shared/src/main/java/com/termux/shared/termux/shell/command/environment/TermuxAppShellEnvironment.java
index 7f08f562..3fafd56e 100644
--- a/termux-shared/src/main/java/com/termux/shared/termux/shell/command/environment/TermuxAppShellEnvironment.java
+++ b/termux-shared/src/main/java/com/termux/shared/termux/shell/command/environment/TermuxAppShellEnvironment.java
@@ -77,7 +77,8 @@ public class TermuxAppShellEnvironment {
     public static final String ENV_TERMUX_APP__PACKAGE_VARIANT = TERMUX_APP_ENV_PREFIX + "PACKAGE_VARIANT";
     /** Environment variable for the Termux app files directory. */
     public static final String ENV_TERMUX_APP__DATA_DIR = TERMUX_APP_ENV_PREFIX + "DATA_DIR";
-
+    public static final String ENV_TERMUX_APP__LEGACY_DATA_DIR = TERMUX_APP_ENV_PREFIX + "LEGACY_DATA_DIR";
+    public static final String ENV_TERMUX_APP__BUILD_DATA_DIR = TERMUX_APP_ENV_PREFIX + "BUILD_DATA_DIR";
 
     /** Environment variable for the Termux app {@link TermuxAmSocketServer#getTermuxAppAMSocketServerEnabled(Context)}. */
     public static final String ENV_TERMUX_APP__AM_SOCKET_SERVER_ENABLED = TERMUX_APP_ENV_PREFIX + "AM_SOCKET_SERVER_ENABLED";
@@ -143,6 +144,8 @@ public class TermuxAppShellEnvironment {
              */
 
             ShellEnvironmentUtils.putToEnvIfSet(environment, ENV_TERMUX_APP__DATA_DIR, applicationInfo.dataDir);
+            ShellEnvironmentUtils.putToEnvIfSet(environment, ENV_TERMUX_APP__LEGACY_DATA_DIR, "/data/data/" + applicationInfo.packageName);
+            ShellEnvironmentUtils.putToEnvIfSet(environment, ENV_TERMUX_APP__BUILD_DATA_DIR, TermuxConstants.TERMUX_INTERNAL_PRIVATE_APP_DATA_DIR_PATH);
 
             ShellEnvironmentUtils.putToEnvIfSet(environment, ENV_TERMUX__SE_PROCESS_CONTEXT, SELinuxUtils.getContext());
             ShellEnvironmentUtils.putToEnvIfSet(environment, ENV_TERMUX__SE_FILE_CONTEXT, SELinuxUtils.getFileContext(applicationInfo.dataDir));
diff --git a/termux-shared/src/main/java/com/termux/shared/termux/shell/command/environment/TermuxShellEnvironment.java b/termux-shared/src/main/java/com/termux/shared/termux/shell/command/environment/TermuxShellEnvironment.java
index 5f3519c5..05c5fc8f 100644
--- a/termux-shared/src/main/java/com/termux/shared/termux/shell/command/environment/TermuxShellEnvironment.java
+++ b/termux-shared/src/main/java/com/termux/shared/termux/shell/command/environment/TermuxShellEnvironment.java
@@ -1,9 +1,12 @@
 package com.termux.shared.termux.shell.command.environment;
 
 import android.content.Context;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageInfo;
 
 import androidx.annotation.NonNull;
 
+import com.termux.shared.android.PackageUtils;
 import com.termux.shared.errors.Error;
 import com.termux.shared.file.FileUtils;
 import com.termux.shared.logger.Logger;
@@ -77,8 +80,19 @@ public class TermuxShellEnvironment extends AndroidShellEnvironment {
             environment.putAll(termuxApiAppEnvironment);
          */
 
+        ApplicationInfo applicationInfo = PackageUtils.getApplicationInfoForPackage(currentPackageContext, TermuxConstants.TERMUX_PACKAGE_NAME);
+        if (applicationInfo != null && !applicationInfo.enabled) {
+            applicationInfo = null;
+        }
+
+        if (applicationInfo != null) {
+            environment.put("TERMUX__APPS_DIR", applicationInfo.dataDir + "/termux/apps");
+        }
+        environment.put("TERMUX__ROOTFS", TermuxConstants.TERMUX_FILES_DIR_PATH);
         environment.put(ENV_HOME, TermuxConstants.TERMUX_HOME_DIR_PATH);
+        environment.put("TERMUX__HOME", TermuxConstants.TERMUX_HOME_DIR_PATH);
         environment.put(ENV_PREFIX, TermuxConstants.TERMUX_PREFIX_DIR_PATH);
+        environment.put("TERMUX__PREFIX", TermuxConstants.TERMUX_PREFIX_DIR_PATH);
 
         // If failsafe is not enabled, then we keep default PATH and TMPDIR so that system binaries can be used
         if (!isFailSafe) {