libstore: Add apple-virt to system features when available

I'm sure that we'll adjust the implementation over time, but this
at least discerns between an apple silicon bare metal machine and
a tart VM.

(cherry picked from commit 9277eb276bf0a942e88fcf499f6a6b9c262be853)

1 files changed, 1 insertions, 0 deletions

diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index cf10edebd..dba7d78ef 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -708,6 +708,7 @@ public:
           `kvm` feature.
 
           This setting by default includes `kvm` if `/dev/kvm` is accessible,
+          `apple-virt` if hardware virtualization is available on macOS,
           and the pseudo-features `nixos-test`, `benchmark` and `big-parallel`
           that are used in Nixpkgs to route builds to specific machines.
         )", {}, false};