refactor(tvix): move castore into tvix-castore crate r/6629

This splits the pure content-addressed layers from tvix-store into a
`castore` crate, and only leaves PathInfo related things, as well as the
CLI entrypoint in the tvix-store crate.

Notable changes:
 - `fixtures` and `utils` had to be moved out of the `test` cfg, so they
   can be imported from tvix-store.
 - Some ad-hoc fixtures in the test were moved to proper fixtures in the
   same step.
 - The protos are now created by a (more static) recipe in the protos/
   directory.

The (now two) golang targets are commented out, as it's not possible to
update them properly in the same CL. This will be done by a followup CL
once this is merged (and whitby deployed)

Bug: https://b.tvl.fyi/issues/301

Change-Id: I8d675d4bf1fb697eb7d479747c1b1e3635718107
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9370
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: Connor Brewster <cbrewster@hey.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/tvix/castore/build.rs b/tvix/castore/build.rs
new file mode 100644
index 0000000000..9f06c88333
--- /dev/null
+++ b/tvix/castore/build.rs
@@ -0,0 +1,38 @@
+use std::io::Result;
+
+fn main() -> Result<()> {
+    #[allow(unused_mut)]
+    let mut builder = tonic_build::configure();
+
+    #[cfg(feature = "reflection")]
+    {
+        let out_dir = std::path::PathBuf::from(std::env::var("OUT_DIR").unwrap());
+        let descriptor_path = out_dir.join("tvix.castore.v1.bin");
+
+        builder = builder.file_descriptor_set_path(descriptor_path);
+    };
+
+    // https://github.com/hyperium/tonic/issues/908
+    let mut config = prost_build::Config::new();
+    config.bytes(["."]);
+
+    builder
+        .build_server(true)
+        .build_client(true)
+        .compile_with_config(
+            config,
+            &[
+                "tvix/castore/protos/castore.proto",
+                "tvix/castore/protos/rpc_blobstore.proto",
+                "tvix/castore/protos/rpc_directory.proto",
+            ],
+            // If we are in running `cargo build` manually, using `../..` works fine,
+            // but in case we run inside a nix build, we need to instead point PROTO_ROOT
+            // to a sparseTree containing that structure.
+            &[match std::env::var_os("PROTO_ROOT") {
+                Some(proto_root) => proto_root.to_str().unwrap().to_owned(),
+                None => "../..".to_string(),
+            }],
+        )?;
+    Ok(())
+}