pub struct GitStateWatcher { /* private fields */ }Expand description
Watches .git/ internals for state changes relevant to indexing.
The watcher attaches to the resolved gitdir (supporting the .git-file
worktree layout) and buffers notify events in a channel. Callers drain
the channel with Self::poll_changed and then re-classify the current
state against their last-indexed snapshot via Self::classify.
Implementations§
Source§impl GitStateWatcher
impl GitStateWatcher
Sourcepub fn new(repo_root: &Path) -> Result<Self>
pub fn new(repo_root: &Path) -> Result<Self>
Creates a new git-state watcher attached to the resolved gitdir for
the repository at repo_root.
Supports both the conventional .git/ directory layout and the
.git-file worktree/submodule layout (gitdir: <path>).
§Errors
Returns an error if:
repo_rootdoes not contain a.gitentry (file or directory).- The
.gitfile is malformed or its target gitdir cannot be resolved. - The underlying notify watcher cannot be created or attached.
Sourcepub fn repo_root(&self) -> &Path
pub fn repo_root(&self) -> &Path
Returns the repository working-tree root this watcher was constructed for.
Sourcepub fn poll_changed(&self) -> bool
pub fn poll_changed(&self) -> bool
Drains all pending events from the underlying notify channel.
Returns true if at least one event was observed since the last call
(including error events), false if the channel was empty. Callers
use this as a “something happened in .git/” trigger and then call
Self::classify to interpret the change.
Sourcepub fn current_state(&self) -> LastIndexedGitState
pub fn current_state(&self) -> LastIndexedGitState
Captures the current git state as a LastIndexedGitState snapshot.
This is the snapshot callers should persist alongside an index build
and pass back into Self::classify on subsequent polls.
The snapshot is acquired with minimal race exposure:
head_refis read from the.git/HEADfile directly (file I/O, no subprocess fork) — this completes in microseconds.head_commit_oidandhead_tree_oidare obtained from a singlegit rev-parse HEAD HEAD^{tree}subprocess, which resolves both values against the same repository state.
The only remaining TOCTOU window is between the file read (step 1)
and the subprocess (step 2). If HEAD moves in that window the
classifier will see a ref/commit mismatch and fall back to
GitChangeClass::BranchSwitch (full rebuild), which is correct by
the daemon’s conservative fallback rule.
On any git command failure this returns a snapshot with None
fields, which guarantees the next Self::classify call falls back
to GitChangeClass::BranchSwitch (full rebuild).
Sourcepub fn classify(&self, last: &LastIndexedGitState) -> GitChangeClass
pub fn classify(&self, last: &LastIndexedGitState) -> GitChangeClass
Classifies the current git state against the last-indexed snapshot.
Returns one of the four GitChangeClass variants according to the
rules documented on the module.
On any uncertainty (failed git rev-parse, missing fields in either
the current state or the stored snapshot) this returns
GitChangeClass::BranchSwitch — the conservative “fall back to a
full rebuild” rule.
Auto Trait Implementations§
impl Freeze for GitStateWatcher
impl RefUnwindSafe for GitStateWatcher
impl Send for GitStateWatcher
impl !Sync for GitStateWatcher
impl Unpin for GitStateWatcher
impl UnsafeUnpin for GitStateWatcher
impl UnwindSafe for GitStateWatcher
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