refactor(tvix/store): import_path → import_path_as_nar_ca

Add multiple additional helpers such as:

- `path_to_name`: derive the basename of a given path
- `derive_nar_ca_path_info`: derive the `PathInfo` for a content
  addressed NAR

which isolates further the tree walking feature and the ingestion feature.

Additionally, we don't `expect` anymore and propagate properly ingestion errors up.

Change-Id: I60edb5b633911c58ade7e19f5002e6f75f90e262
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10574
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Autosubmit: raitobezarius <tvl@lahfa.xyz>

tvix/store/src/utils.rs

@@ -1,18 +1,11 @@
-use std::{path::Path, sync::Arc};
+use std::sync::Arc;
 
-use data_encoding::BASE64;
-use nix_compat::store_path::{self, StorePath};
-use tracing::{debug, instrument};
 use tvix_castore::{
     blobservice::{self, BlobService},
     directoryservice::{self, DirectoryService},
-    proto::node::Node,
 };
 
-use crate::{
-    pathinfoservice::{self, PathInfoService},
-    proto::{nar_info, NarInfo, PathInfo},
-};
+use crate::pathinfoservice::{self, PathInfoService};
 
 /// Construct the three store handles from their addrs.
 pub async fn construct_services(
@@ -40,110 +33,3 @@ pub async fn construct_services(
 
     Ok((blob_service, directory_service, path_info_service))
 }
-
-/// Imports a given path on the filesystem into the store, and returns the
-/// [PathInfo] describing the path, that was sent to
-/// [PathInfoService].
-#[instrument(skip_all, fields(path=?path), err)]
-pub async fn import_path<BS, DS, PS, P>(
-    path: P,
-    blob_service: BS,
-    directory_service: DS,
-    path_info_service: PS,
-) -> Result<StorePath, std::io::Error>
-where
-    P: AsRef<Path> + std::fmt::Debug,
-    BS: AsRef<dyn BlobService> + Clone,
-    DS: AsRef<dyn DirectoryService>,
-    PS: AsRef<dyn PathInfoService>,
-{
-    // calculate the name
-    // TODO: make a path_to_name helper function?
-    let name = path
-        .as_ref()
-        .file_name()
-        .and_then(|file_name| file_name.to_str())
-        .ok_or_else(|| {
-            std::io::Error::new(
-                std::io::ErrorKind::InvalidInput,
-                "path must not be .. and the basename valid unicode",
-            )
-        })?;
-
-    // Ingest the path into blob and directory service.
-    let root_node = tvix_castore::import::ingest_path(blob_service, &directory_service, &path)
-        .await
-        .expect("failed to ingest path");
-
-    debug!(root_node =?root_node, "import successful");
-
-    // Ask the PathInfoService for the NAR size and sha256
-    let (nar_size, nar_sha256) = path_info_service.as_ref().calculate_nar(&root_node).await?;
-
-    // Calculate the output path. This might still fail, as some names are illegal.
-    let output_path = store_path::build_nar_based_store_path(&nar_sha256, name).map_err(|_| {
-        std::io::Error::new(
-            std::io::ErrorKind::InvalidData,
-            format!("invalid name: {}", name),
-        )
-    })?;
-
-    // assemble a new root_node with a name that is derived from the nar hash.
-    let root_node = root_node.rename(output_path.to_string().into_bytes().into());
-    log_node(&root_node, path.as_ref());
-
-    // assemble the [crate::proto::PathInfo] object.
-    let path_info = PathInfo {
-        node: Some(tvix_castore::proto::Node {
-            node: Some(root_node),
-        }),
-        // There's no reference scanning on path contents ingested like this.
-        references: vec![],
-        narinfo: Some(NarInfo {
-            nar_size,
-            nar_sha256: nar_sha256.to_vec().into(),
-            signatures: vec![],
-            reference_names: vec![],
-            deriver: None,
-            ca: Some(nar_info::Ca {
-                r#type: nar_info::ca::Hash::NarSha256.into(),
-                digest: nar_sha256.to_vec().into(),
-            }),
-        }),
-    };
-
-    // put into [PathInfoService], and return the PathInfo that we get back
-    // from there (it might contain additional signatures).
-    let _path_info = path_info_service.as_ref().put(path_info).await?;
-
-    Ok(output_path.to_owned())
-}
-
-fn log_node(node: &Node, path: &Path) {
-    match node {
-        Node::Directory(directory_node) => {
-            debug!(
-                path = ?path,
-                name = ?directory_node.name,
-                digest = BASE64.encode(&directory_node.digest),
-                "import successful",
-            )
-        }
-        Node::File(file_node) => {
-            debug!(
-                path = ?path,
-                name = ?file_node.name,
-                digest = BASE64.encode(&file_node.digest),
-                "import successful"
-            )
-        }
-        Node::Symlink(symlink_node) => {
-            debug!(
-                path = ?path,
-                name = ?symlink_node.name,
-                target = ?symlink_node.target,
-                "import successful"
-            )
-        }
-    }
-}