shardline-storage 1.2.0

Content-addressed object storage contracts and adapters for Shardline.
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use std::{
    fs::{self, Metadata},
    io::ErrorKind,
    path::Path,
};

use super::store::LocalObjectStoreError;
use super::util::map_directory_path_error;

pub fn object_file_metadata(path: &Path) -> Result<Option<Metadata>, LocalObjectStoreError> {
    match fs::symlink_metadata(path) {
        Ok(metadata) => {
            ensure_regular_file_metadata(&metadata)?;
            Ok(Some(metadata))
        }
        Err(error) if error.kind() == ErrorKind::NotFound => Ok(None),
        Err(error) => Err(LocalObjectStoreError::Io(error)),
    }
}

// This function is `pub(super)`-accessible; used from mod.rs, io.rs, and walk.rs.
pub fn ensure_parent_directories_are_not_symlinked(
    root: &Path,
    path: &Path,
) -> Result<(), LocalObjectStoreError> {
    ensure_directory_path_components_are_not_symlinked(root)?;
    let parent = if path == root {
        root
    } else {
        path.parent().unwrap_or(root)
    };
    ensure_directory_path_components_are_not_symlinked(parent)?;

    Ok(())
}

pub(super) fn ensure_directory_path_components_are_not_symlinked(
    path: &Path,
) -> Result<(), LocalObjectStoreError> {
    crate::ensure_directory_path_components_are_not_symlinked(path)
        .map_err(map_directory_path_error)
}

pub fn ensure_regular_file_metadata(metadata: &Metadata) -> Result<(), LocalObjectStoreError> {
    if metadata.file_type().is_file() {
        return Ok(());
    }

    Err(LocalObjectStoreError::InvalidObjectPath)
}