Inital nixcache test

Signed-off-by: karim mdmirajul <karim.mdmirajul@unikie.com>

terraform/tests/nix_cache.sh

@@ -0,0 +1,62 @@
+#!/bin/bash
+set -e
+
+URL=${URL:-"https://ghaf-binary-cache-dev.northeurope.cloudapp.azure.com/nix-cache-info"}
+
+function check_cache() {
+    output=$(curl -Ls "$URL")
+    if [ "$output" != "StoreDir: /nix/store" ]; then
+        echo "NixOS binary cache is not available or changed."
+        exit 1
+    fi
+}
+
+function extract_hash() {
+    if [ ! -z "$1" ]; then
+        hash=$1
+    else
+        full_path=$(ls -la result | awk '{print $NF}')
+        hash=${full_path##*/}
+        hash=${hash%-nixos-disk-image}
+    fi
+
+    if [[ ! "$hash" ]]; then
+        echo "Failed to extract hash."
+        exit 1
+    fi
+
+    echo $hash
+}
+
+function get_narinfo() {
+    narinfo_url="https://ghaf-binary-cache-dev.northeurope.cloudapp.azure.com/$1.narinfo"
+    curl_output=$(curl -L "$narinfo_url" -s | grep -v "References")
+
+    if [[ ! "$curl_output" ]]; then
+        echo "Failed to retrieve or process narinfo."
+        exit 1
+    fi
+
+    echo "$curl_output" | grep "URL:" | awk '{print $2}'
+}
+
+function download_nar() {
+    nar_url="https://ghaf-binary-cache-dev.northeurope.cloudapp.azure.com/$1"
+    curl -L "$nar_url" -o nixos.img.nar.zst
+}
+
+function decompress_nar() {
+    zstd --decompress nixos.img.nar.zst -o nixos.img.nar
+}
+
+function restore_nar() {
+    cat nixos.img.nar | nix-store --restore imagedir
+}
+
+check_cache
+hash=$(extract_hash "$1")
+nar_file_name=$(get_narinfo "$hash")
+download_nar "$nar_file_name"
+decompress_nar
+restore_nar
+ls -la imagedir