build(envrc): check min required version for direnv and bash

Signed-off-by: Artur Troian <[email protected]>

.envrc

@@ -1,3 +1,18 @@
+direnv_version_major=$(direnv version | cut -d "." -f1 | tr -d '\n')
+direnv_version_minor=$(direnv version | cut -d "." -f2 | tr -d '\n')
+
+if [[ $direnv_version_major -lt 2 ]] || [[ $direnv_version_major -eq 2 ]] && [[ $direnv_version_minor -lt 32 ]]; then
+    echo -e "\033[31munsupported direnv version $(direnv version) < 2.32.x"
+    exit 1
+fi
+
+if [[ "$SHELL" == "bash" ]]; then
+    if [ "${BASH_VERSINFO:-0}" -lt 4 ]; then
+        echo -e "\033[31mthe environment needs BASH 4 or above" >&2
+        exit 1
+    fi
+fi
+
 if ! has make ; then
 	echo "make is not installed"; exit 1
 fi
@@ -31,7 +46,6 @@ if [ -z "$GOPATH" ]; then
     export GOPATH
 fi
 
-
 AKASH_ROOT=$(pwd)
 
 export AKASH_ROOT