feat(nix-daemon): Implement client handler. r/8907

This change includes only the basic nix handshake protocol handling and
sets up a client session. The only supported operation at this point is
SetOptions.

Additional operations will be implemented in subsequent cls.

Change-Id: I3eccd9e0ceb270c3865929543c702f1491768852
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12743
Autosubmit: Vladimir Kryachko <v.kryachko@gmail.com>
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Reviewed-by: edef <edef@edef.eu>
Reviewed-by: Brian Olsen <me@griff.name>

1 files changed, 18 insertions, 0 deletions

diff --git a/tvix/nix-daemon/src/lib.rs b/tvix/nix-daemon/src/lib.rs
new file mode 100644
index 000000000000..f10d6c7ad669
--- /dev/null
+++ b/tvix/nix-daemon/src/lib.rs
@@ -0,0 +1,18 @@
+use std::sync::Arc;
+
+use nix_compat::nix_daemon::NixDaemonIO;
+use tvix_store::pathinfoservice::PathInfoService;
+
+#[allow(dead_code)]
+pub struct TvixDaemon {
+    path_info_service: Arc<dyn PathInfoService>,
+}
+
+impl TvixDaemon {
+    pub fn new(path_info_service: Arc<dyn PathInfoService>) -> Self {
+        Self { path_info_service }
+    }
+}
+
+/// Implements [NixDaemonIO] backed by tvix services.
+impl NixDaemonIO for TvixDaemon {}