spectrumPackages.spectrum-vm: custom crosvm opts

This will be especially useful for testing crosvm cargo builds, which
only work at the moment with --disable-sandbox.  Testing these builds
before was extremely annoying, but it can be done relatively easily as
follows:

    cargo build
    spectrum-vm -C target/debug/crosvm -- --disable-sandbox

1 files changed, 6 insertions, 8 deletions

diff --git a/pkgs/os-specific/linux/spectrum/spectrum-vm/spectrum-vm.in b/pkgs/os-specific/linux/spectrum/spectrum-vm/spectrum-vm.in
index 7c653da12f4..daacfcd22ac 100755
--- a/pkgs/os-specific/linux/spectrum/spectrum-vm/spectrum-vm.in
+++ b/pkgs/os-specific/linux/spectrum/spectrum-vm/spectrum-vm.in
@@ -3,12 +3,13 @@ set -ue
 
 ex_usage() {
     cat <<EOF
-Usage: $(basename "$0") [OPTION]...
+Usage: $(basename "$0") [OPTION]... [-- CROSVM_OPTIONS]
 
   -c COMMAND         shell command to run inside VM
   -C, --crosvm PATH  path to custom crosvm executable
   -k, --kernel PATH  path to custom kernel image
   -f, --rootfs PATH  path to custom root file system image
+  -- CROSVM_OPTIONS  extra arguments to pass to crosvm
 EOF
     exit "$1"
 }
@@ -54,22 +55,19 @@ do
     esac
 done
 
-if [ "$#" -ne 0 ]; then
-    ex_usage 1 >&2
-fi
-
 set +e
 if [ -n "$XDG_RUNTIME_DIR" ]
 then
-    set -- -s "$XDG_RUNTIME_DIR"
+    set -- -s "$XDG_RUNTIME_DIR" "$@"
     if [ -n "$WAYLAND_DISPLAY" ]
-    then set -- "$@" --wayland-sock "$XDG_RUNTIME_DIR/$WAYLAND_DISPLAY"
+    then set -- --wayland-sock "$XDG_RUNTIME_DIR/$WAYLAND_DISPLAY" "$@"
     fi
 fi
 set -e
 
-exec "$crosvm" run "$@" \
+exec "$crosvm" run \
     -p init=/sbin/init \
     -p "spectrumcmd=$(printf %s "$command" | base64)" \
     --root "$rootfs" \
+    "$@" \
     "$kernel"