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use std::path::Path;
use git::objs::tree::EntryMode;
use git::sec::trust::DefaultForLevel;
use git::{Commit, ObjectId, Repository, ThreadSafeRepository};
use git_repository as git;
use crate::DiffProvider;
#[cfg(test)]
mod test;
pub struct Git;
impl Git {
fn open_repo(path: &Path, ceiling_dir: Option<&Path>) -> Option<ThreadSafeRepository> {
// custom open options
let mut git_open_opts_map = git::sec::trust::Mapping::<git::open::Options>::default();
// don't use the global git configs (not needed)
let config = git::permissions::Config {
system: false,
git: false,
user: false,
env: true,
includes: true,
git_binary: false,
};
// change options for config permissions without touching anything else
git_open_opts_map.reduced = git_open_opts_map.reduced.permissions(git::Permissions {
config,
..git::Permissions::default_for_level(git::sec::Trust::Reduced)
});
git_open_opts_map.full = git_open_opts_map.full.permissions(git::Permissions {
config,
..git::Permissions::default_for_level(git::sec::Trust::Full)
});
let mut open_options = git::discover::upwards::Options::default();
if let Some(ceiling_dir) = ceiling_dir {
open_options.ceiling_dirs = vec![ceiling_dir.to_owned()];
}
ThreadSafeRepository::discover_with_environment_overrides_opts(
path,
open_options,
git_open_opts_map,
)
.ok()
}
}
impl DiffProvider for Git {
fn get_diff_base(&self, file: &Path) -> Option<Vec<u8>> {
debug_assert!(!file.exists() || file.is_file());
debug_assert!(file.is_absolute());
// TODO cache repository lookup
let repo = Git::open_repo(file.parent()?, None)?.to_thread_local();
let head = repo.head_commit().ok()?;
let file_oid = find_file_in_commit(&repo, &head, file)?;
let file_object = repo.find_object(file_oid).ok()?;
Some(file_object.detach().data)
}
}
/// Finds the object that contains the contents of a file at a specific commit.
fn find_file_in_commit(repo: &Repository, commit: &Commit, file: &Path) -> Option<ObjectId> {
let repo_dir = repo.work_dir()?;
let rel_path = file.strip_prefix(repo_dir).ok()?;
let tree = commit.tree().ok()?;
let tree_entry = tree.lookup_entry_by_path(rel_path).ok()??;
match tree_entry.mode() {
// not a file, everything is new, do not show diff
EntryMode::Tree | EntryMode::Commit | EntryMode::Link => None,
// found a file
EntryMode::Blob | EntryMode::BlobExecutable => Some(tree_entry.object_id()),
}
}
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