chore(tvix): move store/fs to castore/fs r/7256

With the recent introduction of the RootNodes trait, there's nothing in
the fs module pulling in tvix-store dependencies, so it can live in
tvix-castore.

This allows other crates to make use of TvixStoreFS, without having to
pull in tvix-store.

For example, a tvix-build using a fuse mountpoint at /nix/store doesn't
need a PathInfoService to hold the root nodes that should be present,
but just a list.

tvix-store now has a pathinfoservice/fs module, which contains the
necessary glue logic to implement the RootNodes trait for a
PathInfoService.

To satisfy Rust orphan rules for trait implementations, we had to add a
small wrapper struct. It's mostly hidden away by the make_fs helper
function returning a TvixStoreFs.

It can't be entirely private, as its still leaking into the concrete
type of TvixStoreFS.

tvix-store still has `fuse` and `virtiofs` features, but they now simply
enable these features in the `tvix-castore` crate they depend on.

The tests for the fuse functionality stay in tvix-store for now, as
they populate the root nodes through a PathInfoService.

Once above mentioned "list of root nodes" implementation exists, we
might want to shuffle this around one more time.

Fixes b/341.

Change-Id: I989f664827a5a361b23b34368d242d10c157c756
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10378
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>

1 files changed, 5 insertions, 46 deletions

diff --git a/tvix/store/Cargo.toml b/tvix/store/Cargo.toml
index 044b305b96ae..0a8e690e8250 100644
--- a/tvix/store/Cargo.toml
+++ b/tvix/store/Cargo.toml
@@ -14,7 +14,6 @@ data-encoding = "2.3.3"
 futures = "0.3.28"
 lazy_static = "1.4.0"
 nix-compat = { path = "../nix-compat", features = ["async"] }
-parking_lot = "0.12.1"
 pin-project-lite = "0.2.13"
 prost = "0.12.1"
 sha2 = "0.10.6"
@@ -35,42 +34,10 @@ async-recursion = "1.0.5"
 reqwest = { version = "0.11.22", features = ["rustls-tls", "stream"], default-features = false }
 xz2 = "0.1.7"
 
-[dependencies.fuse-backend-rs]
-optional = true
-version = "0.11.0"
-
-[dependencies.vhost]
-optional = true
-version = "0.6"
-
-[dependencies.vhost-user-backend]
-optional = true
-version = "0.8"
-
-[dependencies.virtio-queue]
-optional = true
-version = "0.7"
-
-[dependencies.vm-memory]
-optional = true
-version = "0.10"
-
-[dependencies.vmm-sys-util]
-optional = true
-version = "0.11"
-
-[dependencies.virtio-bindings]
-optional = true
-version = "0.2.1"
-
 [dependencies.tonic-reflection]
 optional = true
 version = "0.10.2"
 
-[dependencies.libc]
-optional = true
-version = "0.2.144"
-
 [build-dependencies]
 prost-build = "0.12.1"
 tonic-build = "0.10.2"
@@ -80,19 +47,11 @@ test-case = "2.2.2"
 tempfile = "3.3.0"
 tokio-retry = "0.3.0"
 
+[dev-dependencies.libc]
+version = "0.2.144"
+
 [features]
 default = ["fuse", "tonic-reflection"]
-fs = ["dep:libc", "dep:fuse-backend-rs"]
-virtiofs = [
-  "fs",
-  "dep:vhost",
-  "dep:vhost-user-backend",
-  "dep:virtio-queue",
-  "dep:vm-memory",
-  "dep:vmm-sys-util",
-  "dep:virtio-bindings",
-  "fuse-backend-rs?/vhost-user-fs", # impl FsCacheReqHandler for SlaveFsCacheReq
-  "fuse-backend-rs?/virtiofs",
-]
-fuse = ["fs"]
+fuse = ["tvix-castore/fuse"]
+virtiofs = ["tvix-castore/virtiofs"]
 tonic-reflection = ["dep:tonic-reflection", "tvix-castore/tonic-reflection"]