1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274
use std::collections::HashMap;
use std::fmt::{self, Debug, Formatter};
use std::path::{Path, PathBuf};
use std::task::Poll;
use crate::core::{Dependency, Package, PackageId, SourceId, Summary};
use crate::sources::source::MaybePackage;
use crate::sources::source::QueryKind;
use crate::sources::source::Source;
use crate::sources::PathSource;
use crate::util::errors::CargoResult;
use crate::util::Config;
use anyhow::Context as _;
use cargo_util::{paths, Sha256};
use serde::Deserialize;
/// `DirectorySource` contains a number of crates on the file system. It was
/// designed for representing vendored dependencies for `cargo vendor`.
///
/// `DirectorySource` at this moment is just a root directory containing other
/// directories, which contain the source files of packages. Assumptions would
/// be made to determine if a directory should be included as a package of a
/// directory source's:
///
/// * Ignore directories starting with dot `.` (tend to be hidden).
/// * Only when a `Cargo.toml` exists in a directory will it be included as
/// a package. `DirectorySource` at this time only looks at one level of
/// directories and never went deeper.
/// * There must be a [`Checksum`] file `.cargo-checksum.json` file at the same
/// level of `Cargo.toml` to ensure the integrity when a directory source was
/// created (usually by `cargo vendor`). A failure to find or parse a single
/// checksum results in a denial of loading any package in this source.
/// * Otherwise, there is no other restrction of the name of directories. At
/// this moment, it is `cargo vendor` that defines the layout and the name of
/// each directory.
///
/// The file tree of a directory source may look like:
///
/// ```text
/// [source root]
/// ├── a-valid-crate/
/// │ ├── src/
/// │ ├── .cargo-checksum.json
/// │ └── Cargo.toml
/// ├── .ignored-a-dot-crate/
/// │ ├── src/
/// │ ├── .cargo-checksum.json
/// │ └── Cargo.toml
/// ├── skipped-no-manifest/
/// │ ├── src/
/// │ └── .cargo-checksum.json
/// └── no-checksum-so-fails-the-entire-source-reading/
/// └── Cargo.toml
/// ```
pub struct DirectorySource<'cfg> {
/// The unique identifier of this source.
source_id: SourceId,
/// The root path of this source.
root: PathBuf,
/// Packages that this sources has discovered.
packages: HashMap<PackageId, (Package, Checksum)>,
config: &'cfg Config,
updated: bool,
}
/// The checksum file to ensure the integrity of a package in a directory source.
///
/// The file name is simply `.cargo-checksum.json`. The checksum algorithm as
/// of now is SHA256.
#[derive(Deserialize)]
struct Checksum {
/// Checksum of the package. Normally it is computed from the `.crate` file.
package: Option<String>,
/// Checksums of each source file.
files: HashMap<String, String>,
}
impl<'cfg> DirectorySource<'cfg> {
pub fn new(path: &Path, id: SourceId, config: &'cfg Config) -> DirectorySource<'cfg> {
DirectorySource {
source_id: id,
root: path.to_path_buf(),
config,
packages: HashMap::new(),
updated: false,
}
}
}
impl<'cfg> Debug for DirectorySource<'cfg> {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "DirectorySource {{ root: {:?} }}", self.root)
}
}
impl<'cfg> Source for DirectorySource<'cfg> {
fn query(
&mut self,
dep: &Dependency,
kind: QueryKind,
f: &mut dyn FnMut(Summary),
) -> Poll<CargoResult<()>> {
if !self.updated {
return Poll::Pending;
}
let packages = self.packages.values().map(|p| &p.0);
let matches = packages.filter(|pkg| match kind {
QueryKind::Exact => dep.matches(pkg.summary()),
QueryKind::Fuzzy => true,
});
for summary in matches.map(|pkg| pkg.summary().clone()) {
f(summary);
}
Poll::Ready(Ok(()))
}
fn supports_checksums(&self) -> bool {
true
}
fn requires_precise(&self) -> bool {
true
}
fn source_id(&self) -> SourceId {
self.source_id
}
fn block_until_ready(&mut self) -> CargoResult<()> {
if self.updated {
return Ok(());
}
self.packages.clear();
let entries = self.root.read_dir().with_context(|| {
format!(
"failed to read root of directory source: {}",
self.root.display()
)
})?;
for entry in entries {
let entry = entry?;
let path = entry.path();
// Ignore hidden/dot directories as they typically don't contain
// crates and otherwise may conflict with a VCS
// (rust-lang/cargo#3414).
if let Some(s) = path.file_name().and_then(|s| s.to_str()) {
if s.starts_with('.') {
continue;
}
}
// Vendor directories are often checked into a VCS, but throughout
// the lifetime of a vendor dir crates are often added and deleted.
// Some VCS implementations don't always fully delete the directory
// when a dir is removed from a different checkout. Sometimes a
// mostly-empty dir is left behind.
//
// Additionally vendor directories are sometimes accompanied with
// readme files and other auxiliary information not too interesting
// to Cargo.
//
// To help handle all this we only try processing folders with a
// `Cargo.toml` in them. This has the upside of being pretty
// flexible with the contents of vendor directories but has the
// downside of accidentally misconfigured vendor directories
// silently returning less crates.
if !path.join("Cargo.toml").exists() {
continue;
}
let mut src = PathSource::new(&path, self.source_id, self.config);
src.update()?;
let mut pkg = src.root_package()?;
let cksum_file = path.join(".cargo-checksum.json");
let cksum = paths::read(&path.join(cksum_file)).with_context(|| {
format!(
"failed to load checksum `.cargo-checksum.json` \
of {} v{}",
pkg.package_id().name(),
pkg.package_id().version()
)
})?;
let cksum: Checksum = serde_json::from_str(&cksum).with_context(|| {
format!(
"failed to decode `.cargo-checksum.json` of \
{} v{}",
pkg.package_id().name(),
pkg.package_id().version()
)
})?;
if let Some(package) = &cksum.package {
pkg.manifest_mut()
.summary_mut()
.set_checksum(package.clone());
}
self.packages.insert(pkg.package_id(), (pkg, cksum));
}
self.updated = true;
Ok(())
}
fn download(&mut self, id: PackageId) -> CargoResult<MaybePackage> {
self.packages
.get(&id)
.map(|p| &p.0)
.cloned()
.map(MaybePackage::Ready)
.ok_or_else(|| anyhow::format_err!("failed to find package with id: {}", id))
}
fn finish_download(&mut self, _id: PackageId, _data: Vec<u8>) -> CargoResult<Package> {
panic!("no downloads to do")
}
fn fingerprint(&self, pkg: &Package) -> CargoResult<String> {
Ok(pkg.package_id().version().to_string())
}
fn verify(&self, id: PackageId) -> CargoResult<()> {
let Some((pkg, cksum)) = self.packages.get(&id) else {
anyhow::bail!("failed to find entry for `{}` in directory source", id);
};
for (file, cksum) in cksum.files.iter() {
let file = pkg.root().join(file);
let actual = Sha256::new()
.update_path(&file)
.with_context(|| format!("failed to calculate checksum of: {}", file.display()))?
.finish_hex();
if &*actual != cksum {
anyhow::bail!(
"the listed checksum of `{}` has changed:\n\
expected: {}\n\
actual: {}\n\
\n\
directory sources are not intended to be edited, if \
modifications are required then it is recommended \
that `[patch]` is used with a forked copy of the \
source\
",
file.display(),
cksum,
actual
);
}
}
Ok(())
}
fn describe(&self) -> String {
format!("directory source `{}`", self.root.display())
}
fn add_to_yanked_whitelist(&mut self, _pkgs: &[PackageId]) {}
fn is_yanked(&mut self, _pkg: PackageId) -> Poll<CargoResult<bool>> {
Poll::Ready(Ok(false))
}
fn invalidate_cache(&mut self) {
// Directory source has no local cache.
}
fn set_quiet(&mut self, _quiet: bool) {
// Directory source does not display status
}
}