Added flag to iocsh.bash to choose env.sh file

tools/iocsh.bash

@@ -58,12 +58,8 @@ declare -r TMP_PATH="/tmp/systemd-private-e3-iocsh-$(whoami)"
 # To get the absolute path where iocsh.bash is executed
 IOCSH_TOP=${PWD}
 
-# Load any environment variables
-if [ -f "$IOCSH_TOP/env.sh" ]; then
-    echo "Loading environment variables from $IOCSH_TOP/env.sh"
-    source "$IOCSH_TOP/env.sh"
-fi
-
+# Load any environment variables, default is $IOCSH_TOP/env.sh
+loadEnv "$@"
 
 BASECODE="$(basecode_generator)"
 

tools/iocsh_functions

@@ -374,7 +374,26 @@ function check_mandatory_env_settings
     done
 };
 
+function loadEnv
+{
+    local envfile=$IOCSH_TOP/env.sh
+    while [ $# -gt 0 ]; do
+
+    arg=$1
+    case $arg in
+        ( -e )
+        shift
+        envfile=$1
+        ;;
+    esac
+    shift
+    done
 
+    if [ -f "$envfile" ]; then
+        echo "Loading environment variables from $envfile"
+        source "$envfile"
+    fi
+}
 
 function loadFiles 
 {
@@ -438,6 +457,9 @@ function loadFiles
         ( -dv )
         shift
         __LOADER__="valgrind --leak-check=full "
+        ;;
+        ( -e )
+        shift
         ;;
 	    ( -* )
 	    printf "Unknown option $1\n\n" >&2