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use std::collections::BTreeSet;
use crate::{
file::{init, init::Options, Metadata},
File,
};
/// The error returned by [`File::from_paths_metadata()`] and [`File::from_path_no_includes()`].
#[derive(Debug, thiserror::Error)]
#[allow(missing_docs)]
pub enum Error {
#[error("The configuration file at \"{}\" could not be read", path.display())]
Io {
source: std::io::Error,
path: std::path::PathBuf,
},
#[error(transparent)]
Init(#[from] init::Error),
}
/// Instantiation from one or more paths
impl File<'static> {
/// Load the single file at `path` with `source` without following include directives.
///
/// Note that the path will be checked for ownership to derive trust.
pub fn from_path_no_includes(path: std::path::PathBuf, source: crate::Source) -> Result<Self, Error> {
let trust = match gix_sec::Trust::from_path_ownership(&path) {
Ok(t) => t,
Err(err) => return Err(Error::Io { source: err, path }),
};
let mut buf = Vec::new();
match std::io::copy(
&mut match std::fs::File::open(&path) {
Ok(f) => f,
Err(err) => return Err(Error::Io { source: err, path }),
},
&mut buf,
) {
Ok(_) => {}
Err(err) => return Err(Error::Io { source: err, path }),
}
Ok(File::from_bytes_owned(
&mut buf,
Metadata::from(source).at(path).with(trust),
Default::default(),
)?)
}
/// Constructs a `git-config` file from the provided metadata, which must include a path to read from or be ignored.
/// Returns `Ok(None)` if there was not a single input path provided, which is a possibility due to
/// [`Metadata::path`] being an `Option`.
/// If an input path doesn't exist, the entire operation will abort. See [`from_paths_metadata_buf()`][Self::from_paths_metadata_buf()]
/// for a more powerful version of this method.
pub fn from_paths_metadata(
path_meta: impl IntoIterator<Item = impl Into<Metadata>>,
options: Options<'_>,
) -> Result<Option<Self>, Error> {
let mut buf = Vec::with_capacity(512);
let err_on_nonexisting_paths = true;
Self::from_paths_metadata_buf(
&mut path_meta.into_iter().map(Into::into),
&mut buf,
err_on_nonexisting_paths,
options,
)
}
/// Like [`from_paths_metadata()`][Self::from_paths_metadata()], but will use `buf` to temporarily store the config file
/// contents for parsing instead of allocating an own buffer.
///
/// If `err_on_nonexisting_paths` is false, instead of aborting with error, we will continue to the next path instead.
pub fn from_paths_metadata_buf(
path_meta: &mut dyn Iterator<Item = Metadata>,
buf: &mut Vec<u8>,
err_on_non_existing_paths: bool,
options: Options<'_>,
) -> Result<Option<Self>, Error> {
let mut target = None;
let mut seen = BTreeSet::default();
for (path, mut meta) in path_meta.filter_map(|mut meta| meta.path.take().map(|p| (p, meta))) {
if !seen.insert(path.clone()) {
continue;
}
buf.clear();
match std::io::copy(
&mut match std::fs::File::open(&path) {
Ok(f) => f,
Err(err) if !err_on_non_existing_paths && err.kind() == std::io::ErrorKind::NotFound => continue,
Err(err) => {
let err = Error::Io { source: err, path };
if options.ignore_io_errors {
gix_features::trace::warn!("ignoring: {err:#?}");
continue;
} else {
return Err(err);
}
}
},
buf,
) {
Ok(_) => {}
Err(err) => {
if options.ignore_io_errors {
gix_features::trace::warn!(
"ignoring: {:#?}",
Error::Io {
source: err,
path: path.clone()
}
);
buf.clear();
} else {
return Err(Error::Io { source: err, path });
}
}
}
meta.path = Some(path);
let config = Self::from_bytes_owned(buf, meta, options)?;
match &mut target {
None => {
target = Some(config);
}
Some(target) => {
target.append(config);
}
}
}
Ok(target)
}
}