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//! Import from a real filesystem.
use futures::stream::BoxStream;
use futures::StreamExt;
use std::fs::FileType;
use std::os::unix::ffi::OsStringExt;
use std::os::unix::fs::MetadataExt;
use std::os::unix::fs::PermissionsExt;
use tracing::instrument;
use walkdir::DirEntry;
use walkdir::WalkDir;
use crate::blobservice::BlobService;
use crate::directoryservice::DirectoryService;
use crate::proto::node::Node;
use crate::B3Digest;
use super::ingest_entries;
use super::IngestionEntry;
use super::IngestionError;
/// Ingests the contents at a given path into the tvix store, interacting with a [BlobService] and
/// [DirectoryService]. It returns the root node or an error.
///
/// It does not follow symlinks at the root, they will be ingested as actual symlinks.
///
/// This function will walk the filesystem using `walkdir` and will consume
/// `O(#number of entries)` space.
#[instrument(skip(blob_service, directory_service), fields(path), err)]
pub async fn ingest_path<BS, DS, P>(
blob_service: BS,
directory_service: DS,
path: P,
) -> Result<Node, IngestionError<Error>>
where
P: AsRef<std::path::Path> + std::fmt::Debug,
BS: BlobService + Clone,
DS: DirectoryService,
{
let iter = WalkDir::new(path.as_ref())
.follow_links(false)
.follow_root_links(false)
.contents_first(true)
.into_iter();
let entries = dir_entries_to_ingestion_stream(blob_service, iter, path.as_ref());
ingest_entries(directory_service, entries).await
}
/// Converts an iterator of [walkdir::DirEntry]s into a stream of ingestion entries.
/// This can then be fed into [ingest_entries] to ingest all the entries into the castore.
///
/// The produced stream is buffered, so uploads can happen concurrently.
///
/// The root is the [Path] in the filesystem that is being ingested into the castore.
pub fn dir_entries_to_ingestion_stream<'a, BS, I>(
blob_service: BS,
iter: I,
root: &'a std::path::Path,
) -> BoxStream<'a, Result<IngestionEntry, Error>>
where
BS: BlobService + Clone + 'a,
I: Iterator<Item = Result<DirEntry, walkdir::Error>> + Send + 'a,
{
let prefix = root.parent().unwrap_or_else(|| std::path::Path::new(""));
Box::pin(
futures::stream::iter(iter)
.map(move |x| {
let blob_service = blob_service.clone();
async move {
match x {
Ok(dir_entry) => {
dir_entry_to_ingestion_entry(blob_service, &dir_entry, prefix).await
}
Err(e) => Err(Error::Stat(
prefix.to_path_buf(),
e.into_io_error().expect("walkdir err must be some"),
)),
}
}
})
.buffered(50),
)
}
/// Converts a [walkdir::DirEntry] into an [IngestionEntry], uploading blobs to the
/// provided [BlobService].
///
/// The prefix path is stripped from the path of each entry. This is usually the parent path
/// of the path being ingested so that the last element of the stream only has one component.
pub async fn dir_entry_to_ingestion_entry<BS>(
blob_service: BS,
entry: &DirEntry,
prefix: &std::path::Path,
) -> Result<IngestionEntry, Error>
where
BS: BlobService,
{
let file_type = entry.file_type();
let fs_path = entry
.path()
.strip_prefix(prefix)
.expect("Tvix bug: failed to strip root path prefix");
// convert to castore PathBuf
let path = crate::path::PathBuf::from_host_path(fs_path, false)
.unwrap_or_else(|e| panic!("Tvix bug: walkdir direntry cannot be parsed: {}", e));
if file_type.is_dir() {
Ok(IngestionEntry::Dir { path })
} else if file_type.is_symlink() {
let target = std::fs::read_link(entry.path())
.map_err(|e| Error::Stat(entry.path().to_path_buf(), e))?
.into_os_string()
.into_vec();
Ok(IngestionEntry::Symlink { path, target })
} else if file_type.is_file() {
let metadata = entry
.metadata()
.map_err(|e| Error::Stat(entry.path().to_path_buf(), e.into()))?;
let digest = upload_blob(blob_service, entry.path().to_path_buf()).await?;
Ok(IngestionEntry::Regular {
path,
size: metadata.size(),
// If it's executable by the user, it'll become executable.
// This matches nix's dump() function behaviour.
executable: metadata.permissions().mode() & 64 != 0,
digest,
})
} else {
return Err(Error::FileType(fs_path.to_path_buf(), file_type));
}
}
/// Uploads the file at the provided [Path] the the [BlobService].
#[instrument(skip(blob_service), fields(path), err)]
async fn upload_blob<BS>(
blob_service: BS,
path: impl AsRef<std::path::Path>,
) -> Result<B3Digest, Error>
where
BS: BlobService,
{
let mut file = match tokio::fs::File::open(path.as_ref()).await {
Ok(file) => file,
Err(e) => return Err(Error::BlobRead(path.as_ref().to_path_buf(), e)),
};
let mut writer = blob_service.open_write().await;
if let Err(e) = tokio::io::copy(&mut file, &mut writer).await {
return Err(Error::BlobRead(path.as_ref().to_path_buf(), e));
};
let digest = writer
.close()
.await
.map_err(|e| Error::BlobFinalize(path.as_ref().to_path_buf(), e))?;
Ok(digest)
}
#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error("unsupported file type at {0}: {1:?}")]
FileType(std::path::PathBuf, FileType),
#[error("unable to stat {0}: {1}")]
Stat(std::path::PathBuf, std::io::Error),
#[error("unable to open {0}: {1}")]
Open(std::path::PathBuf, std::io::Error),
#[error("unable to read {0}: {1}")]
BlobRead(std::path::PathBuf, std::io::Error),
// TODO: proper error for blob finalize
#[error("unable to finalize blob {0}: {1}")]
BlobFinalize(std::path::PathBuf, std::io::Error),
}
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