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use bstr::ByteSlice;
use std::path::Path;
use tracing::{debug, instrument};
use tvix_castore::{
blobservice::BlobService, directoryservice::DirectoryService, import::fs::ingest_path, Node,
PathComponent,
};
use nix_compat::{
nixhash::{CAHash, NixHash},
store_path::{self, StorePath},
};
use crate::{
nar::NarCalculationService,
pathinfoservice::PathInfoService,
proto::{nar_info, NarInfo, PathInfo},
};
impl From<CAHash> for nar_info::Ca {
fn from(value: CAHash) -> Self {
let hash_type: nar_info::ca::Hash = (&value).into();
let digest: bytes::Bytes = value.hash().to_string().into();
nar_info::Ca {
r#type: hash_type.into(),
digest,
}
}
}
pub fn log_node(name: &[u8], node: &Node, path: &Path) {
match node {
Node::Directory { digest, .. } => {
debug!(
path = ?path,
name = %name.as_bstr(),
digest = %digest,
"import successful",
)
}
Node::File { digest, .. } => {
debug!(
path = ?path,
name = %name.as_bstr(),
digest = %digest,
"import successful"
)
}
Node::Symlink { target } => {
debug!(
path = ?path,
name = %name.as_bstr(),
target = ?target,
"import successful"
)
}
}
}
/// Transform a path into its base name and returns an [`std::io::Error`] if it is `..` or if the
/// basename is not valid unicode.
#[inline]
pub fn path_to_name(path: &Path) -> std::io::Result<&str> {
path.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",
)
})
}
/// Takes the NAR size, SHA-256 of the NAR representation, the root node and optionally
/// a CA hash information.
///
/// Returns the path information object for a NAR-style object.
///
/// This [`PathInfo`] can be further filled for signatures, deriver or verified for the expected
/// hashes.
#[inline]
pub fn derive_nar_ca_path_info(
nar_size: u64,
nar_sha256: [u8; 32],
ca: Option<&CAHash>,
name: bytes::Bytes,
root_node: Node,
) -> PathInfo {
// assemble the [crate::proto::PathInfo] object.
PathInfo {
node: Some(tvix_castore::proto::Node::from_name_and_node(
name, 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: ca.map(|ca_hash| ca_hash.into()),
}),
}
}
/// Ingest the contents at the given path `path` into castore, and registers the
/// resulting root node in the passed PathInfoService, using the "NAR sha256
/// digest" and the passed name for output path calculation.
#[instrument(skip_all, fields(store_name=name, path=?path), err)]
pub async fn import_path_as_nar_ca<BS, DS, PS, NS, P>(
path: P,
name: &str,
blob_service: BS,
directory_service: DS,
path_info_service: PS,
nar_calculation_service: NS,
) -> Result<StorePath, std::io::Error>
where
P: AsRef<Path> + std::fmt::Debug,
BS: BlobService + Clone,
DS: DirectoryService,
PS: AsRef<dyn PathInfoService>,
NS: NarCalculationService,
{
let root_node = ingest_path(blob_service, directory_service, path.as_ref())
.await
.map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))?;
// Ask for the NAR size and sha256
let (nar_size, nar_sha256) = nar_calculation_service.calculate_nar(&root_node).await?;
// Calculate the output path. This might still fail, as some names are illegal.
// FUTUREWORK: express the `name` at the type level to be valid and move the conversion
// at the caller level.
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),
)
})?;
let name: PathComponent = output_path
.to_string()
.as_str()
.try_into()
.expect("Tvix bug: StorePath must be PathComponent");
log_node(name.as_ref(), &root_node, path.as_ref());
let path_info = derive_nar_ca_path_info(
nar_size,
nar_sha256,
Some(&CAHash::Nar(NixHash::Sha256(nar_sha256))),
name.into(),
root_node,
);
// This new [`PathInfo`] that we get back from there might contain additional signatures or
// information set by the service itself. In this function, we silently swallow it because
// callers don't really need it.
let _path_info = path_info_service.as_ref().put(path_info).await?;
Ok(output_path.to_owned())
}
#[cfg(test)]
mod tests {
use std::{ffi::OsStr, path::PathBuf};
use crate::import::path_to_name;
use rstest::rstest;
#[rstest]
#[case::simple_path("a/b/c", "c")]
#[case::simple_path_containing_dotdot("a/b/../c", "c")]
#[case::path_containing_multiple_dotdot("a/b/../c/d/../e", "e")]
fn test_path_to_name(#[case] path: &str, #[case] expected_name: &str) {
let path: PathBuf = path.into();
assert_eq!(path_to_name(&path).expect("must succeed"), expected_name);
}
#[rstest]
#[case::path_ending_in_dotdot(b"a/b/..")]
#[case::non_unicode_path(b"\xf8\xa1\xa1\xa1\xa1")]
fn test_invalid_path_to_name(#[case] invalid_path: &[u8]) {
let path: PathBuf = unsafe { OsStr::from_encoded_bytes_unchecked(invalid_path) }.into();
path_to_name(&path).expect_err("must fail");
}
}
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