Bisect, Worktrees, Submodules, LFS and Hooks

Key points

1. 1

   git bisect binary-searches history; bisect run uses exit codes: 0 good, 125 skip, 1–127 bad, ≥128 aborts.

2. 2

   Worktrees share objects and refs but each has its own HEAD, index and files; a branch can be checked out in only one worktree.

3. 3

   Submodules are gitlinks (mode 160000) pinning a commit; clone with --recurse-submodules or run git submodule update --init --recursive.

4. 4

   Git LFS stores ~130-byte pointers in history; without LFS installed (or lfs: true in CI) you get the pointer text instead of the file.

5. 5

   Hooks are never cloned; share them via core.hooksPath or a hook manager, and enforce policy server-side or in CI because --no-verify skips client hooks.

6. 6

   Scripts should use plumbing and porcelain modes: status --porcelain, rev-parse --verify --quiet, for-each-ref, and exit codes like diff --quiet.

7. 7

   For huge repos: partial clone (--filter=blob:none), cone-mode sparse checkout, and git maintenance keep things fast without losing history.

Read the source

• git-bisect documentation
• githooks documentation
• Pro Git: Submodules