feat: Detect Docker Desktop (#242)

Dockerfile

@@ -19,6 +19,7 @@ RUN set -eu && \
         wget \
         7zip \
         curl \
+        fdisk \
         nginx \
         procps \
         seabios \

src/proc.sh

@@ -34,10 +34,10 @@ if [[ "$KVM" != [Nn]* ]]; then
   KVM_ERR=""
 
   if [ ! -e /dev/kvm ]; then
-    KVM_ERR="(device file missing)"
+    KVM_ERR="(/dev/kvm is missing)"
   else
     if ! sh -c 'echo -n > /dev/kvm' &> /dev/null; then
-      KVM_ERR="(no write access)"
+      KVM_ERR="(/dev/kvm is unwriteable)"
     fi
   fi
 
@@ -46,8 +46,16 @@ if [[ "$KVM" != [Nn]* ]]; then
     if [[ "$OSTYPE" =~ ^darwin ]]; then
       warn "you are using macOS which has no KVM support, this will cause a major loss of performance."
     else      
-      error "KVM acceleration not available $KVM_ERR, this will cause a major loss of performance."
+      kernel=$(uname -a)
-      error "See the FAQ on how to diagnose the cause, or continue without KVM by setting KVM=N (not recommended)."
+      case "${kernel,,}" in
+        *"microsoft"* )
+          error "Please bind '/dev/kvm' as a volume in the optional container settings when using Docker Desktop." ;;
+        *"synology"* )
+          error "Please make sure that Synology VMM (Virtual Machine Manager) is installed and that '/dev/kvm' is binded to this container." ;;
+        *)
+          error "KVM acceleration is not available $KVM_ERR, this will cause a major loss of performance."
+          error "See the FAQ for possible causes, or continue without it by adding KVM: \"N\" (not recommended)." ;;
+      esac
       [[ "$DEBUG" != [Yy1]* ]] && exit 88
     fi
   fi