From a07c0a45631463f1d611e696b54ed94802dde050 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Fri, 23 Jun 2017 16:59:29 +0200
Subject: [PATCH] original-tsu

---
 tsu | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100755 tsu

diff --git a/tsu b/tsu
new file mode 100755
index 0000000..d96c9b8
--- /dev/null
+++ b/tsu
@@ -0,0 +1,82 @@
+#!/data/data/com.termux/files/usr/bin/sh
+
+# tsu
+
+show_usage() {
+  echo 'tsu - a wrapper for su for Termux'
+  echo
+  echo 'Usage: tsu [-e|-p|-s <shell>]'
+  echo
+  echo '-s [</path/to/shell>]'
+  echo '    Use an alternate specified shell. `//usr` is expanded to $PREFIX.'
+  echo '-p'
+  echo '    Prepend /system/bin and /system/xbin to PATH.'
+  echo '-e'
+  echo '    Setup up some enviroment variables as when in Termux.'
+}
+	
+# parse the options
+# TODO: validate command line arguments
+while getopts ':ehps:' opt ; do
+case $opt in
+  e)
+      SETUP_ENV=1
+      ;;
+	  
+  s)
+      USER_SHELL=$OPTARG
+      ;;
+  h) 
+      show_usage
+      exit
+      ;;
+  p)
+      PREPEND_SYSTEM_PATH=1
+      ;;
+esac
+done;
+
+# prefix check
+test -z "$PREFIX" && PREFIX=/data/data/com.termux/files/usr
+
+# prepend path
+if test -n "$PREPEND_SYSTEM_PATH"; then
+  PATH="/system/bin:/system/xbin:$PATH"
+fi
+
+# export environment variables.
+if test -n "$SETUP_ENV"; then
+  export HOME=/data/data/com.termux/files/home
+  TERMUX_PATHS=data/data/com.termux/files/usr/bin:/data/data/com.termux/files/usr/bin/applets
+  if test -n "$PREPEND_SYSTEM_PATH"; then
+    PATH="$PATH:$TERMUX_PATHS"
+  else 
+    PATH="$TERMUX_PATHS:$PATH"
+  fi;
+export PATH;
+fi;
+
+# select shell 
+if test -z "$USER_SHELL"; then
+  # check if user has set shell
+  if test -x "$HOME/.termux/shell" ; then
+    ROOT_SHELL=$HOME/.termux/shell
+  # has installed bash?
+  elif test -x "$PREFIX/bin/bash" ; then
+      ROOT_SHELL="$PREFIX/bin/bash"
+# no..fallback to default ash
+  else
+    ROOT_SHELL="$PREFIX/bin/ash"
+  fi
+else 
+  # expand //usr/ to /usr/
+  USER_SHELL_EXPANDED=$(echo "$USER_SHELL" | sed "s|^//usr/|$PREFIX/|")
+  ROOT_SHELL="$USER_SHELL_EXPANDED"
+fi
+
+# using the -c option of su allows to pass enviroment variables
+for s in '/system/xbin/su' '/su/bin/su'; do
+  if [ -e "$s" ]; then
+    exec "$s" --preserve-environment -c "LD_LIBRARY_PATH=$PREFIX/lib $ROOT_SHELL"
+  fi;
+done;