use crate::{blobservice::BlobService, directoryservice::DirectoryService};
use crate::{blobservice::BlobWriter, directoryservice::DirectoryPutter, proto};
use std::{
collections::HashMap,
fmt::Debug,
fs,
fs::File,
io,
os::unix::prelude::PermissionsExt,
path::{Path, PathBuf},
};
use tracing::instrument;
use walkdir::WalkDir;
#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error("failed to upload directory at {0}: {1}")]
UploadDirectoryError(PathBuf, crate::Error),
#[error("invalid encoding encountered for entry {0:?}")]
InvalidEncoding(PathBuf),
#[error("unable to stat {0}: {1}")]
UnableToStat(PathBuf, std::io::Error),
#[error("unable to open {0}: {1}")]
UnableToOpen(PathBuf, std::io::Error),
#[error("unable to read {0}: {1}")]
UnableToRead(PathBuf, std::io::Error),
}
impl From<super::Error> for Error {
fn from(value: super::Error) -> Self {
match value {
crate::Error::InvalidRequest(_) => panic!("tvix bug"),
crate::Error::StorageError(_) => panic!("error"),
}
}
}
// This processes a given [walkdir::DirEntry] and returns a
// proto::node::Node, depending on the type of the entry.
//
// If the entry is a file, its contents are uploaded.
// If the entry is a directory, the Directory is uploaded as well.
// For this to work, it relies on the caller to provide the directory object
// with the previously returned (child) nodes.
//
// It assumes entries to be returned in "contents first" order, means this
// will only be called with a directory if all children of it have been
// visited. If the entry is indeed a directory, it'll also upload that
// directory to the store. For this, the so-far-assembled Directory object for
// this path needs to be passed in.
//
// It assumes the caller adds returned nodes to the directories it assembles.
#[instrument(skip_all, fields(entry.file_type=?&entry.file_type(),entry.path=?entry.path()))]
fn process_entry<BS: BlobService, DP: DirectoryPutter>(
blob_service: &mut BS,
directory_putter: &mut DP,
entry: &walkdir::DirEntry,
maybe_directory: Option<proto::Directory>,
) -> Result<proto::node::Node, Error> {
let file_type = entry.file_type();
let entry_path: PathBuf = entry.path().to_path_buf();
if file_type.is_dir() {
let directory = maybe_directory
.expect("tvix bug: must be called with some directory in the case of directory");
let directory_digest = directory.digest();
let directory_size = directory.size();
// upload this directory
directory_putter
.put(directory)
.map_err(|e| Error::UploadDirectoryError(entry.path().to_path_buf(), e))?;
return Ok(proto::node::Node::Directory(proto::DirectoryNode {
name: entry
.file_name()
.to_str()
.map(|s| Ok(s.to_owned()))
.unwrap_or(Err(Error::InvalidEncoding(entry.path().to_path_buf())))?,
digest: directory_digest.to_vec(),
size: directory_size,
}));
}
if file_type.is_symlink() {
let target = std::fs::read_link(&entry_path)
.map_err(|e| Error::UnableToStat(entry_path.clone(), e))?;
return Ok(proto::node::Node::Symlink(proto::SymlinkNode {
name: entry
.file_name()
.to_str()
.map(|s| Ok(s.to_owned()))
.unwrap_or(Err(Error::InvalidEncoding(entry.path().to_path_buf())))?,
target: target
.to_str()
.map(|s| Ok(s.to_owned()))
.unwrap_or(Err(Error::InvalidEncoding(entry.path().to_path_buf())))?,
}));
}
if file_type.is_file() {
let metadata = entry
.metadata()
.map_err(|e| Error::UnableToStat(entry_path.clone(), e.into()))?;
let mut file = File::open(entry_path.clone())
.map_err(|e| Error::UnableToOpen(entry_path.clone(), e))?;
let mut writer = blob_service.open_write()?;
if let Err(e) = io::copy(&mut file, &mut writer) {
return Err(Error::UnableToRead(entry_path, e));
};
let digest = writer.close()?;
return Ok(proto::node::Node::File(proto::FileNode {
name: entry
.file_name()
.to_str()
.map(|s| Ok(s.to_owned()))
.unwrap_or(Err(Error::InvalidEncoding(entry.path().to_path_buf())))?,
digest: digest.to_vec(),
size: metadata.len() as u32,
// If it's executable by the user, it'll become executable.
// This matches nix's dump() function behaviour.
executable: metadata.permissions().mode() & 64 != 0,
}));
}
todo!("handle other types")
}
/// Ingests the contents at the given path into the tvix store,
/// interacting with a [BlobService] and [DirectoryService].
/// It returns the root node or an error.
///
/// It's not interacting with a [PathInfoService], it's up to the caller to
/// possibly register it somewhere (and potentially rename it based on some
/// naming scheme.
#[instrument(skip(blob_service, directory_service), fields(path=?p))]
pub fn ingest_path<BS: BlobService, DS: DirectoryService, P: AsRef<Path> + Debug>(
blob_service: &mut BS,
directory_service: &mut DS,
p: P,
) -> Result<proto::node::Node, Error> {
// Probe if the path points to a symlink. If it does, we process it manually,
// due to https://github.com/BurntSushi/walkdir/issues/175.
let symlink_metadata = fs::symlink_metadata(p.as_ref())
.map_err(|e| Error::UnableToStat(p.as_ref().to_path_buf(), e))?;
if symlink_metadata.is_symlink() {
let target = std::fs::read_link(p.as_ref())
.map_err(|e| Error::UnableToStat(p.as_ref().to_path_buf(), e))?;
return Ok(proto::node::Node::Symlink(proto::SymlinkNode {
name: p
.as_ref()
.file_name()
.unwrap_or_default()
.to_str()
.map(|s| Ok(s.to_owned()))
.unwrap_or(Err(Error::InvalidEncoding(p.as_ref().to_path_buf())))?,
target: target
.to_str()
.map(|s| Ok(s.to_owned()))
.unwrap_or(Err(Error::InvalidEncoding(p.as_ref().to_path_buf())))?,
}));
}
let mut directories: HashMap<PathBuf, proto::Directory> = HashMap::default();
let mut directory_putter = directory_service.put_multiple_start();
for entry in WalkDir::new(p)
.follow_links(false)
.contents_first(true)
.sort_by_file_name()
{
let entry = entry.unwrap();
// process_entry wants an Option<Directory> in case the entry points to a directory.
// make sure to provide it.
let maybe_directory: Option<proto::Directory> = {
if entry.file_type().is_dir() {
Some(
directories
.entry(entry.path().to_path_buf())
.or_default()
.clone(),
)
} else {
None
}
};
let node = process_entry(blob_service, &mut directory_putter, &entry, maybe_directory)?;
if entry.depth() == 0 {
return Ok(node);
} else {
// calculate the parent path, and make sure we register the node there.
// NOTE: entry.depth() > 0
let parent_path = entry.path().parent().unwrap().to_path_buf();
// record node in parent directory, creating a new [proto:Directory] if not there yet.
let parent_directory = directories.entry(parent_path).or_default();
match node {
proto::node::Node::Directory(e) => parent_directory.directories.push(e),
proto::node::Node::File(e) => parent_directory.files.push(e),
proto::node::Node::Symlink(e) => parent_directory.symlinks.push(e),
}
}
}
// unreachable, we already bailed out before if root doesn't exist.
panic!("tvix bug")
}
