perf: Remove libgit2/git2 dependency, replace with gix-object#12015
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Remove the git2 and libgit2-sys dependencies entirely. libgit2-sys was a 25-second serial C compilation on the critical build path — the single largest bottleneck in the build. Production code changes: - hash_object.rs: Replace git2::Oid::hash_file with gix_object::compute_hash (gix-object was already compiled transitively, zero new crates added) - Remove all #[cfg(feature = "git2")] conditional compilation - Collapse dual codepaths (git2 + CLI) into single CLI codepaths for ls-tree, status, worktree detection, and branch/SHA queries - repo_index.rs: Use gix-index path unconditionally (was already preferred) - turborepo-boundaries: Drop gitignore check (was already the fallback) Test changes: - Replace all git2 test fixtures with git CLI subprocess calls - Add regression test verifying blob hashes match `git hash-object`
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## Release v2.8.12-canary.3 Versioned docs: https://v2-8-12-canary-3.turborepo.dev ### Changes - fix: Prevent peerDependencies from overwriting concrete dependency specifiers (#12004) (`a038409`) - ci: Trigger prysk integration tests via `cargo nextest` (#11999) (`2053ede`) - release(turborepo): 2.8.12-canary.2 (#12005) (`dccfdf0`) - fix: Resolve correct nested package version in bun lockfile pruning (#12008) (`95dff45`) - refactor: Replace shell-based fixture setup with pure Rust (#12006) (`a743e38`) - fix: Resolve all lockfile pruning test failures (#12009) (`21dcaed`) - perf: Extract query module into turborepo-query crate (#12007) (`0604379`) - refactor: Migrate dry-json prysk tests to Rust + insta snapshots (#12010) (`2606f3f`) - perf: Deduplicate petgraph, fixedbitset, and dashmap (#12011) (`9b11ef6`) - refactor: Migrate persistent-dependencies and task-dependencies to Rust + insta (#12012) (`9aab7b5`) - test: Add lockfile-tests fixture for issue #12013 (#12014) (`bae81f7`) - perf: Remove libgit2/git2 dependency, replace with gix-object (#12015) (`fbf50e5`) - refactor: Migrate daemon, jsonc, query, edit-turbo-json tests to Rust (#12016) (`bf730d5`) - perf: Remove async-graphql from turborepo-lib (#12017) (`7c8a4a0`) - refactor: Migrate inference and run-logging tests to Rust (#12018) (`dc4f922`) - refactor: Migrate run-caching and strict-env-vars tests to Rust (#12020) (`c07645d`) - fix: Mark lockfile-aware-caching/bun prysk test as flaky (#12021) (`c60f0c1`) - fix: Add nextest retries for flaky tests (#12027) (`9d90270`) - refactor: Migrate prune and run-summary tests to Rust (#12022) (`329bdb5`) - ci: Increase Rust test partitions from 4 to 10 (#12028) (`0c1bd47`) - fix: Add nextest retries for flaky prysk tests (#12030) (`9b66431`) - ci: Use larger runners for macOS Rust tests (#12029) (`9479a54`) - fix: Add nextest retries for flaky prune_test::test_prune_composable_config (#12032) (`b47e099`) - fix: Suppress npm upgrade notices in Rust integration tests (#12033) (`f698b04`) - ci: Disable flaky Rust unit tests from release pipeline (#12034) (`829b351`) --------- Co-authored-by: Turbobot <turbobot@vercel.com>
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Summary
git2andlibgit2-sysentirely from the dependency treegix-object::compute_hash(already compiled transitively — zero new crates)#[cfg(feature = "git2")]dual codepaths into single implementationsgit hash-objectWhy
libgit2-syswas a 25-second serial C compilation sitting on the critical build path. Every crate downstream ofturborepo-scmwas blocked waiting for it. Sincegix-objectis already in the dependency tree (viagix-index), this change removes 25s of serial C compilation with zero new crate additions.What changed
Production code: The codebase already had CLI fallbacks (
gitsubprocess calls) for every git2 operation — branch detection, SHA queries, ls-tree, status, worktree discovery. The git2 paths were just in-process optimizations. This PR removes the git2 paths and keeps the CLI paths as the sole implementation. The one exception is blob hashing (hash_object.rs) which now usesgix_object::compute_hashinstead ofgit2::Oid::hash_file.repo_index.rs: The gix-index path (reading.git/indexdirectly) was already the preferred path with libgit2 as fallback. Now it's the only path.turborepo-boundaries: Drops the gitignore check (status_should_ignore) which was already the fallback behavior when git2 was disabled. The glob patterns already excludenode_modules.Tests: All git2 test fixtures replaced with
Command::new("git")subprocess calls. Addedtest_blob_hash_matches_git_hash_objectregression test that verifies empty files, text files, binary files, and large files all produce OIDs identical togit hash-object.For reviewers
The
-771 +289line delta is mostly deletion of git2 codepaths that had CLI equivalents. Thetest_merge_basetest neededgit reset --softinstead ofgit checkout --detachto match git2'sset_head_detachedbehavior (moves HEAD without resetting the working tree).