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134 lines
5.0 KiB
Rust
134 lines
5.0 KiB
Rust
use anyhow::{bail, Context, Result};
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use arc_swap::ArcSwap;
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use gix::filter::plumbing::driver::apply::Delay;
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use std::io::Read;
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use std::path::Path;
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use std::sync::Arc;
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use gix::objs::tree::EntryKind;
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use gix::sec::trust::DefaultForLevel;
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use gix::{Commit, ObjectId, Repository, ThreadSafeRepository};
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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>) -> Result<ThreadSafeRepository> {
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// custom open options
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let mut git_open_opts_map = gix::sec::trust::Mapping::<gix::open::Options>::default();
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// On windows various configuration options are bundled as part of the installations
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// This path depends on the install location of git and therefore requires some overhead to lookup
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// This is basically only used on windows and has some overhead hence it's disabled on other platforms.
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// `gitoxide` doesn't use this as default
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let config = gix::open::permissions::Config {
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system: true,
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git: true,
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user: true,
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env: true,
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includes: true,
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git_binary: cfg!(windows),
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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
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.reduced
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.permissions(gix::open::Permissions {
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config,
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..gix::open::Permissions::default_for_level(gix::sec::Trust::Reduced)
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});
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git_open_opts_map.full = git_open_opts_map.full.permissions(gix::open::Permissions {
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config,
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..gix::open::Permissions::default_for_level(gix::sec::Trust::Full)
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});
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let open_options = gix::discover::upwards::Options {
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ceiling_dirs: ceiling_dir
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.map(|dir| vec![dir.to_owned()])
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.unwrap_or_default(),
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dot_git_only: true,
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..Default::default()
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};
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let res = 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(res)
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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) -> Result<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_dir = file.parent().context("file has no parent directory")?;
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let repo = Git::open_repo(repo_dir, None)
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.context("failed to open git repo")?
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.to_thread_local();
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let head = repo.head_commit()?;
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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)?;
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let data = file_object.detach().data;
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// Get the actual data that git would make out of the git object.
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// This will apply the user's git config or attributes like crlf conversions.
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if let Some(work_dir) = repo.work_dir() {
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let rela_path = file.strip_prefix(work_dir)?;
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let rela_path = gix::path::try_into_bstr(rela_path)?;
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let (mut pipeline, _) = repo.filter_pipeline(None)?;
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let mut worktree_outcome =
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pipeline.convert_to_worktree(&data, rela_path.as_ref(), Delay::Forbid)?;
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let mut buf = Vec::with_capacity(data.len());
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worktree_outcome.read_to_end(&mut buf)?;
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Ok(buf)
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} else {
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Ok(data)
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}
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}
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fn get_current_head_name(&self, file: &Path) -> Result<Arc<ArcSwap<Box<str>>>> {
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debug_assert!(!file.exists() || file.is_file());
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debug_assert!(file.is_absolute());
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let repo_dir = file.parent().context("file has no parent directory")?;
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let repo = Git::open_repo(repo_dir, None)
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.context("failed to open git repo")?
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.to_thread_local();
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let head_ref = repo.head_ref()?;
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let head_commit = repo.head_commit()?;
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let name = match head_ref {
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Some(reference) => reference.name().shorten().to_string(),
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None => head_commit.id.to_hex_with_len(8).to_string(),
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};
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Ok(Arc::new(ArcSwap::from_pointee(name.into_boxed_str())))
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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) -> Result<ObjectId> {
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let repo_dir = repo.work_dir().context("repo has no worktree")?;
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let rel_path = file.strip_prefix(repo_dir)?;
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let tree = commit.tree()?;
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let tree_entry = tree
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.lookup_entry_by_path(rel_path, &mut Vec::new())?
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.context("file is untracked")?;
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match tree_entry.mode().kind() {
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// not a file, everything is new, do not show diff
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mode @ (EntryKind::Tree | EntryKind::Commit | EntryKind::Link) => {
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bail!("entry at {} is not a file but a {mode:?}", file.display())
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}
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// found a file
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EntryKind::Blob | EntryKind::BlobExecutable => Ok(tree_entry.object_id()),
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}
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}
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