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use crate::nixpkgs_problem::NixpkgsProblem;
use crate::utils;
use crate::utils::LineIndex;
use crate::validation::{self, ResultIteratorExt, Validation::Success};
use anyhow::Context;
use rnix::{Root, SyntaxKind::NODE_PATH};
use std::ffi::OsStr;
use std::fs::read_to_string;
use std::path::Path;
/// Check that every package directory in pkgs/by-name doesn't link to outside that directory.
/// Both symlinks and Nix path expressions are checked.
pub fn check_references(
relative_package_dir: &Path,
absolute_package_dir: &Path,
) -> validation::Result<()> {
// The empty argument here is the subpath under the package directory to check
// An empty one means the package directory itself
check_path(relative_package_dir, absolute_package_dir, Path::new("")).context(format!(
"While checking the references in package directory {}",
relative_package_dir.display()
))
}
/// Checks for a specific path to not have references outside
fn check_path(
relative_package_dir: &Path,
absolute_package_dir: &Path,
subpath: &Path,
) -> validation::Result<()> {
let path = absolute_package_dir.join(subpath);
Ok(if path.is_symlink() {
// Check whether the symlink resolves to outside the package directory
match path.canonicalize() {
Ok(target) => {
// No need to handle the case of it being inside the directory, since we scan through the
// entire directory recursively anyways
if let Err(_prefix_error) = target.strip_prefix(absolute_package_dir) {
NixpkgsProblem::OutsideSymlink {
relative_package_dir: relative_package_dir.to_path_buf(),
subpath: subpath.to_path_buf(),
}
.into()
} else {
Success(())
}
}
Err(io_error) => NixpkgsProblem::UnresolvableSymlink {
relative_package_dir: relative_package_dir.to_path_buf(),
subpath: subpath.to_path_buf(),
io_error,
}
.into(),
}
} else if path.is_dir() {
// Recursively check each entry
validation::sequence_(
utils::read_dir_sorted(&path)?
.into_iter()
.map(|entry| {
let entry_subpath = subpath.join(entry.file_name());
check_path(relative_package_dir, absolute_package_dir, &entry_subpath)
.context(format!("Error while recursing into {}", subpath.display()))
})
.collect_vec()?,
)
} else if path.is_file() {
// Only check Nix files
if let Some(ext) = path.extension() {
if ext == OsStr::new("nix") {
check_nix_file(relative_package_dir, absolute_package_dir, subpath).context(
format!("Error while checking Nix file {}", subpath.display()),
)?
} else {
Success(())
}
} else {
Success(())
}
} else {
// This should never happen, git doesn't support other file types
anyhow::bail!("Unsupported file type for path {}", subpath.display());
})
}
/// Check whether a nix file contains path expression references pointing outside the package
/// directory
fn check_nix_file(
relative_package_dir: &Path,
absolute_package_dir: &Path,
subpath: &Path,
) -> validation::Result<()> {
let path = absolute_package_dir.join(subpath);
let parent_dir = path.parent().context(format!(
"Could not get parent of path {}",
subpath.display()
))?;
let contents =
read_to_string(&path).context(format!("Could not read file {}", subpath.display()))?;
let root = Root::parse(&contents);
if let Some(error) = root.errors().first() {
return Ok(NixpkgsProblem::CouldNotParseNix {
relative_package_dir: relative_package_dir.to_path_buf(),
subpath: subpath.to_path_buf(),
error: error.clone(),
}
.into());
}
let line_index = LineIndex::new(&contents);
Ok(validation::sequence_(root.syntax().descendants().map(
|node| {
let text = node.text().to_string();
let line = line_index.line(node.text_range().start().into());
if node.kind() != NODE_PATH {
// We're only interested in Path expressions
Success(())
} else if node.children().count() != 0 {
// Filters out ./foo/${bar}/baz
// TODO: We can just check ./foo
NixpkgsProblem::PathInterpolation {
relative_package_dir: relative_package_dir.to_path_buf(),
subpath: subpath.to_path_buf(),
line,
text,
}
.into()
} else if text.starts_with('<') {
// Filters out search paths like <nixpkgs>
NixpkgsProblem::SearchPath {
relative_package_dir: relative_package_dir.to_path_buf(),
subpath: subpath.to_path_buf(),
line,
text,
}
.into()
} else {
// Resolves the reference of the Nix path
// turning `../baz` inside `/foo/bar/default.nix` to `/foo/baz`
match parent_dir.join(Path::new(&text)).canonicalize() {
Ok(target) => {
// Then checking if it's still in the package directory
// No need to handle the case of it being inside the directory, since we scan through the
// entire directory recursively anyways
if let Err(_prefix_error) = target.strip_prefix(absolute_package_dir) {
NixpkgsProblem::OutsidePathReference {
relative_package_dir: relative_package_dir.to_path_buf(),
subpath: subpath.to_path_buf(),
line,
text,
}
.into()
} else {
Success(())
}
}
Err(e) => NixpkgsProblem::UnresolvablePathReference {
relative_package_dir: relative_package_dir.to_path_buf(),
subpath: subpath.to_path_buf(),
line,
text,
io_error: e,
}
.into(),
}
}
},
)))
}
|