feat(tvix/store/bin): factor out import

While at it, make it a bit more generic.

Change-Id: Ic4caefda93aca3ffb656a09f8b4d648b41415532
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10511
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI

tvix/store/src/utils.rs

@@ -1,11 +1,18 @@
-use std::sync::Arc;
+use std::{ops::Deref, path::Path, 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};
+use crate::{
+    pathinfoservice::{self, PathInfoService},
+    proto::{nar_info, NarInfo, PathInfo},
+};
 
 /// Construct the three store handles from their addrs.
 pub async fn construct_services(
@@ -33,3 +40,110 @@ 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: Deref<Target = dyn BlobService> + Clone,
+    DS: Deref<Target = dyn DirectoryService> + Clone,
+    PS: Deref<Target = 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.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.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"
+            )
+        }
+    }
+}