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// SPDX-FileCopyrightText: edef <edef@unfathomable.blue>
// SPDX-License-Identifier: OSL-3.0
use {
byteorder::{BigEndian, ByteOrder},
prost::Message,
std::{collections::BTreeMap, fs, io, os::unix::fs::PermissionsExt, path::Path},
};
pub mod store {
include!(concat!(env!("OUT_DIR"), "/fossil.store.rs"));
}
const DIGEST_BYTES: usize = blake3::OUT_LEN;
const OFFSET_BYTES: usize = 4;
pub struct Store {
db: sled::Db,
}
impl Store {
pub fn open(path: impl AsRef<Path>) -> io::Result<Store> {
let db = sled::open(path)?;
Ok(Store { db })
}
pub fn add_path(&self, path: impl AsRef<Path>) -> Node {
let path = path.as_ref();
let meta = fs::symlink_metadata(path).unwrap();
match meta.file_type() {
ty if ty.is_dir() => {
let mut d = Directory::new();
let mut size: u32 = 0;
for entry in path.read_dir().unwrap() {
let entry = entry.unwrap();
let name = entry.file_name().into_string().unwrap();
let child = self.add_path(entry.path());
size = size.checked_add(child.size()).expect("overflow");
d.children.insert(name, child);
}
let blob = d.into_pb().encode_to_vec();
Node::Directory(DirectoryRef {
ident: self.write_blob(&blob),
size,
})
}
ty if ty.is_file() => {
let executable = (meta.permissions().mode() & 0o100) != 0;
let blob = fs::read(path).unwrap();
Node::File(FileRef {
executable,
ident: self.write_blob(&blob),
size: blob.len().try_into().expect("overflow"),
})
}
ty if ty.is_symlink() => {
let target = path
.read_link()
.unwrap()
.to_str()
.expect("symlink target is invalid UTF-8")
.to_owned();
Node::Link { target }
}
_ => panic!("not a symlink or a regular file"),
}
}
fn write_blob(&self, data: &[u8]) -> Digest {
let digest = {
let mut h = blake3::Hasher::new();
h.update_with_join::<blake3::join::RayonJoin>(data);
*h.finalize().as_bytes()
};
// TODO(edef): maybe don't use the default tree?
// we should probably have a "blob" tree,
// and reserve the default tree for DB metadata
self.db
.transaction::<_, _, sled::Error>(|db| {
for (n, chunk) in data.chunks(4096).enumerate() {
let mut key = [0u8; DIGEST_BYTES + OFFSET_BYTES];
key[..DIGEST_BYTES].copy_from_slice(&digest);
BigEndian::write_u32(&mut key[DIGEST_BYTES..], n as u32);
db.insert(&key[..], chunk)?;
}
Ok(())
})
.unwrap();
digest.into()
}
pub fn read_blob(&self, r#ref: Digest) -> Vec<u8> {
let mut buffer = Vec::new();
let mut h = blake3::Hasher::new();
for element in self.db.scan_prefix(r#ref.as_bytes()) {
let (_, chunk) = element.unwrap();
h.update(&chunk);
buffer.extend_from_slice(&chunk);
}
if h.finalize() != r#ref {
if buffer.is_empty() {
panic!("blob not found");
}
panic!("hash mismatch");
}
buffer
}
}
pub type Digest = blake3::Hash;
pub struct Directory {
pub children: BTreeMap<String, Node>,
}
#[derive(Clone)]
pub enum Node {
Directory(DirectoryRef),
File(FileRef),
Link { target: String },
}
#[derive(Clone)]
pub struct DirectoryRef {
pub ident: Digest,
pub size: u32,
}
#[derive(Debug, Clone)]
pub struct FileRef {
pub ident: Digest,
pub executable: bool,
pub size: u32,
}
impl Node {
fn size(&self) -> u32 {
match self {
&Node::Directory(DirectoryRef { size, .. }) => size.checked_add(1).expect("overflow"),
_ => 1,
}
}
}
impl Directory {
pub fn new() -> Directory {
Directory {
children: BTreeMap::new(),
}
}
pub fn into_pb(self) -> store::Directory {
let mut d = store::Directory::default();
for (name, node) in self.children.into_iter() {
match node {
Node::Directory(DirectoryRef { ident, size }) => {
d.directories.push(store::DirectoryNode {
name,
size,
r#ref: ident.as_bytes().to_vec(),
})
}
Node::File(FileRef {
ident,
executable,
size,
}) => d.files.push(store::FileNode {
name,
r#ref: ident.as_bytes().to_vec(),
executable,
size,
}),
Node::Link { target } => d.links.push(store::LinkNode { name, target }),
}
}
d
}
pub fn from_pb(pb: store::Directory) -> Directory {
let mut children = BTreeMap::new();
for child in pb.directories {
children.insert(
child.name,
Node::Directory(DirectoryRef {
ident: digest_from_bytes(&child.r#ref),
size: child.size,
}),
);
}
for child in pb.files {
children.insert(
child.name,
Node::File(FileRef {
ident: digest_from_bytes(&child.r#ref),
executable: child.executable,
size: child.size,
}),
);
}
for child in pb.links {
children.insert(
child.name,
Node::Link {
target: child.target,
},
);
}
Directory { children }
}
}
#[track_caller]
pub fn digest_from_bytes(bytes: &[u8]) -> Digest {
if bytes.len() != DIGEST_BYTES {
panic!(
"digest is {} bytes, expecting {} bytes",
bytes.len(),
DIGEST_BYTES
);
}
let mut buffer = [0; DIGEST_BYTES];
buffer.copy_from_slice(bytes);
buffer.into()
}
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