Version 1.0

Is now very stable and runs for days without any problems
Also added a debug mode that can be flashed as another module

README.md

@@ -133,7 +133,7 @@ Since this is a [Go](https://golang.org/) program, compiling the code should be
 If that's the case, you can run...
 * [`build.sh`](build.sh) to build the program
 * [`deploy.sh`](deploy.sh) to build the program and push it to your phone (if it has an `/sbin` directory, you can now use it from the command line)
-* [`build-module.sh`](build-module.sh) to package this program in a Magisk Module you can install from Magisk Manager. It will run `backtap` on boot, which is exactly what I wanted.
+* [`build-module.sh`](build-module.sh) to package this program in a Magisk Module you can install from Magisk Manager. It will run `backtap` on boot. To build a debug version that creates a log file at `/cache/backtap.log`, you can pass `-debug` to this script as first parameter.
 
 If not, you have to look into what the `GOARCH` environment variable does and then edit `build.sh` to use the correct value for your phone.
 

build-module.sh

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 set -e
 
 # We just build the executable
@@ -10,8 +12,34 @@ mv backtap module/backtap/system/bin/backtap
 
 cd module/backtap
 
+ZIP_NAME="MagiskModule-backtap.zip"
+
+if [ "$1" == "-debug" ]
+then
+    echo "Building in debug mode"
+
+    ZIP_NAME="MagiskModule-backtap-debug.zip"
+
+    # Add file to enable debug mode (see service.sh)
+    touch "DEBUG"
+    # Read module props file before
+    FILE_BEFORE=$(<module.prop)
+
+    # exit_cleanup resets all of them on exit    
+    exit_cleanup() {
+        rm -f DEBUG
+        echo "$FILE_BEFORE" > module.prop
+    }
+    trap exit_cleanup EXIT
+
+    # Mark version as debug version
+    sed -i -Ee 's/version=(.*)/version=\1-debug/g' module.prop
+fi
+
 # remove the old packed module, if possible
-rm -f ../../MagiskModule-backtap.zip 
+rm -f "../../$ZIP_NAME"
 
 # and create the new one
-zip -r ../../MagiskModule-backtap.zip .
+zip -r "../../$ZIP_NAME" . 
+
+

module/backtap/module.prop

@@ -1,6 +1,6 @@
 id=backtap
 name=backtap
-version=v0.16
-versionCode=00016
+version=v1.0
+versionCode=00100
 author=xarantolus
 description=Enables several gestures when tapping the fingerprint sensor of a Xiaomi Mi Mix 2

module/backtap/service.sh

@@ -3,7 +3,10 @@
 # This script runs on boot. Here we can start our service
 MODDIR=${0%/*}
 
-echo "Waiting for user to unlock/decrypt phone" > /cache/backtap.log
+# Log debug message 
+if [ -f "$MODDIR/DEBUG" ]; then
+  echo "Waiting for user to unlock/decrypt phone" > /cache/backtap.log
+fi
 
 # Wait until boot & decryption finished
 until [ -d /sdcard/Download ]
@@ -17,8 +20,16 @@ pgrep zygote > /dev/null && {
   done
 }
 
+# Make backtap executable in case it isn't
 BTPATH="/system/bin/backtap"
-
 chmod +x "$BTPATH"
 
-nohup "$BTPATH" -debug >>/cache/backtap.log 2>&1 &
+
+if [ -f "$MODDIR/DEBUG" ]; then
+  # Start in debug mode and log to cache directory
+  nohup "$BTPATH" -debug >>/cache/backtap.log 2>&1 &
+else
+  # Start in normal mode
+  nohup "$BTPATH" &
+fi
+