Function shadow_sync_active

atomic-cli/src/commands/git/shadow.rs:96–101

Whether git shadow sync is established for this repo (the `.git/info/exclude` carries Atomic's shadow patterns, written by import/push). Used to gate the view-switch git-follow so we never touch HEAD in a plain (non-shadow) repo.

(git_repo: &GitRepository)

/// carries Atomic's shadow patterns, written by import/push). Used to gate the
/// view-switch git-follow so we never touch HEAD in a plain (non-shadow) repo.
fn shadow_sync_active(git_repo: &GitRepository) -> bool {
    let exclude = git_repo.path().join("info").join("exclude");
    std::fs::read_to_string(exclude)
        .map(|c| c.lines().any(|l| l.trim() == "/.atomic/"))
        .unwrap_or(false)
}

/// Acquire the repo-scoped shadow-commit lock, or return `None` (a no-op skip)
/// if a shadow materialize/commit is already in flight (SPEC §4.3 / Principle 5).