Module busy 

Busy detection: determine whether a worktree is currently in use.

Two signals are combined:

1. Session lockfile (explicit — gw shell/gw start write one)
2. Process cwd scan (implicit — catches external cd + tool usage)

The current process and its ancestor chain are excluded so that Claude Code or a parent shell invoking gw delete on its own worktree does not self-detect as busy.

Structs

BusyInfo

Information about a single process holding a worktree busy.

Enums

BusySource

Signal source that flagged a process as busy.

BusyTier

Tier of a busy signal — controls refusal strength in gw delete. Hard signals (active Claude session, explicit lockfile) refuse with a strong message. Soft signals (process cwd scan) refuse with a warning. Both tiers are overridable by the same --force flag.

Functions

detect_busy

Detect busy processes for a given worktree path.

detect_busy_lockfile_only

Fast busy detection using only the session lockfile.

detect_busy_tiered

Tiered busy detection: returns (hard, soft) separately so the caller can render distinct refusal messages.

self_process_tree

Returns the current process + all ancestor PIDs (via getppid chain). Memoized for the lifetime of the process — the ancestry does not change during a single gw invocation.

self_siblings

Returns the memoized sibling set (see compute_self_siblings).