Bash implementation of the appimage-builder AppRun

AppRun.sh

#!/bin/bash

export ORIGIN="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"

PRINTENV_BIN=$(which printenv)

set_bundle_env() {
  eval "echo SETTING_ENV: $NAME $VALUE"
  NAME="$1"
  VALUE="$2"

  STARTUP_VAL="$VALUE"
  ORIGINAL_VAL="$($PRINTENV_BIN $NAME)"

  eval "export APPRUN_ORIGINAL_$NAME=$ORIGINAL_VAL"
  eval "export APPRUN_STARTUP_$NAME=$STARTUP_VAL"
  eval "export $NAME=$VALUE"
}

read_ld_so_version() {
  VERSION=$(strings "$1" | grep -Eo "ld-[0-9]{1,4}\.[0-9]{1,4}.so" | cut -f 2 -d- | rev | cut -f 2- -d . | rev )
  echo "$VERSION"
}

format_exported_path() {
  EXPORTED_PATH="/tmp/appimage-$APPIMAGE_UUID-$(basename $1)" 
  echo "$EXPORTED_PATH"
}


input="$ORIGIN/.env"
while IFS= read -r line
do
  NAME="${line%=*}"
  VALUE="${line#*=}"
  
  case $NAME in
    EXEC_PATH | EXEC_ARGS | APPDIR_LIBRARY_PATH | APPDIR_LIBC_VERSION | LIBC_LIBRARY_PATH | SYSTEM_INTERP | EXPORTED_BINARIES)
      eval "$line"
    ;;
    
    APPDIR | ORIGIN | APPIMAGE_UUID)
      set_bundle_env "$NAME" "$VALUE"
    ;;
  esac  
done < "$input"


echo ""
echo  --- Exporting Binaries ---

readarray -d : -t strarr <<< "$EXPORTED_BINARIES"
for (( n=0; n < ${#strarr[*]}; n++))
do
  ORIG_PATH="${strarr[n]}"
  EXPORTED_PATH="$(format_exported_path $ORIG_PATH)"
  cp -v $ORIG_PATH $EXPORTED_PATH
done

echo ""
echo  --- Setting Runtime ---

INTERPRETER_PATH="${SYSTEM_INTERP%;*}"
LD_SO_VERSION=$(read_ld_so_version "$INTERPRETER_PATH")
echo SYSTEM_INTERPRETER version: $LD_SO_VERSION path: "$INTERPRETER_PATH"

BUNDLE_INTERPRETER_PATH="$APPDIR/opt/libc/${SYSTEM_INTERP%;*}"
BUNDLE_LD_SO_VERSION=$(read_ld_so_version "$BUNDLE_INTERPRETER_PATH")

echo BUNDLE_INTERPRETER version: $BUNDLE_LD_SO_VERSION path: "$BUNDLE_INTERPRETER_PATH"

MAJOR_VERSION=$(printf "$BUNDLE_LD_SO_VERSION\n$LD_SO_VERSION\n" | sort -V | tail -1)
echo MAJOR_VERSION: $MAJOR_VERSION


EXPORTED_LD_SO_PATH="$(format_exported_path $BUNDLE_INTERPRETER_PATH)"
if [ "$MAJOR_VERSION" == "$BUNDLE_LD_SO_VERSION" ]; then
  echo ""
  echo " ## USING BUNDLE RUNTIME ##"
  cp $BUNDLE_INTERPRETER_PATH $EXPORTED_LD_SO_PATH
  set_bundle_env "LD_LIBRARY_PATH" "$LIBC_LIBRARY_PATH:$APPDIR_LIBRARY_PATH"
else
  echo ""
  echo " ## USING SYSTEM RUNTIME ##"
  cp $INTERPRETER_PATH $EXPORTED_LD_SO_PATH
  set_bundle_env "LD_LIBRARY_PATH" "$APPDIR_LIBRARY_PATH"
fi

while IFS= read -r line
do
  NAME="${line%=*}"
  VALUE="${line#*=}"
  
  case $NAME in
    APPDIR_LIBRARY_PATH | APPDIR_LIBC_VERSION | LIBC_LIBRARY_PATH | SYSTEM_INTERP | EXPORTED_BINARIES )
        unset $NAME
    ;;

    EXEC_PATH | EXEC_ARGS | APPDIR | ORIGIN )
    ;;

    *)
      set_bundle_env "$NAME" "$VALUE"
    ;;
  esac  
done < "$input"

echo ""
echo  --- Launching Application ---
EXEC_LINE="exec $EXEC_PATH $EXEC_ARGS $@"
echo "$EXEC_LINE"
eval "$EXEC_LINE"

Bash alternative for https://github.com/AppImageCrafters/AppRun