customize script for OS type (#14)

Signed-off-by: Sheetal Pamecha <[email protected]>

hack/check-drenv-prereqs.sh

@@ -1,13 +1,20 @@
 #!/bin/bash
 set -e
 
-if ! groups "$USER" | grep -qw libvirt; then
-  echo "Error: User is not part of the libvirt group."
-  exit 1
+os=$(uname -s)
+
+if [[ "$os" == "Linux" ]]
+then
+  if ! groups "$USER" | grep -qw libvirt; then
+    echo "Error: User is not part of the libvirt group."
+    exit 1
+  fi
 fi
 
 commands=("minikube" "kubectl" "clusteradm" "subctl" "velero" "helm" "virtctl"
-"virt-host-validate" "kustomize" "mc")
+"kustomize" "mc")
+
+linux_only_commands=("virt-host-validate")
 
 for cmd in "${commands[@]}"; do
   if ! command -v "$cmd" &> /dev/null; then
@@ -16,9 +23,21 @@ for cmd in "${commands[@]}"; do
   fi
 done
 
-if ! virt-host-validate qemu -q; then
-  echo "Error: 'virt-host-validate qemu' did not return 0."
-  exit 1
+if [[ "$os" == "Linux" ]]
+then
+  for cmd in "${linux_only_commands[@]}"; do
+    if ! command -v "$cmd" &> /dev/null; then
+      echo "Error: $cmd could not be found in PATH."
+      exit 1
+    fi
+  done
+fi
+if [[ "$os" == "Linux" ]]
+then
+  if ! virt-host-validate qemu -q; then
+    echo "Error: 'virt-host-validate qemu' did not return 0."
+    exit 1
+  fi
 fi
 
 echo "All prerequisites met for drenv"