[mod] try to use greadlink if readlink is not available

README.md

@@ -15,6 +15,7 @@ Create a new searx instance in five minutes using Docker (see https://github.com
 ## How to use it
 - [Install docker](https://docs.docker.com/install/)
 - [Install docker-compose](https://docs.docker.com/compose/install/) (be sure that docker-compose version is at least 1.9.0).
+- only on MacOSX: ```brew install coreutils``` to install ```greadlink```
 - Get searx-docker
 ```sh
 cd /usr/local

start.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
-BASE_DIR="$(dirname -- "`readlink -f -- "$0"`")"
+READLINK="$(which readlink greadlink | tail -n1)"
+BASE_DIR="$(dirname -- "`$READLINK -f -- "$0"`")"
 cd -- "$BASE_DIR"
 
 . ./util.sh

stop.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
-BASE_DIR="$(dirname -- "`readlink -f -- "$0"`")"
+READLINK="$(which readlink greadlink | tail -n1)"
+BASE_DIR="$(dirname -- "`$READLINK -f -- "$0"`")"
 cd -- "$BASE_DIR"
 
 . ./util.sh

update.sh

@@ -11,7 +11,8 @@ SERVICE_NAME="searx-docker.service"
 # rebase : rebase with autostash, at your own risk
 UPDATE_TYPE="fastforward"
 
-BASE_DIR="$(dirname -- "`readlink -f -- "$0"`")"
+READLINK="$(which readlink greadlink | tail -n1)"
+BASE_DIR="$(dirname -- "`$READLINK -f -- "$0"`")"
 cd -- "$BASE_DIR"
 
 # check if git presence