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