Function sig_fold_path_stat

src/watcher/watcher.c:514–525

Fold a listed path's (size, mtime) into the signature so an in-place edit * of an already-dirty file still produces a new signature. A failed stat * (deleted file, quoting artifact) degrades to the entry text alone — the * deletion itself is represented by the porcelain status. */

 * (deleted file, quoting artifact) degrades to the entry text alone — the
 * deletion itself is represented by the porcelain status. */
static uint64_t sig_fold_path_stat(uint64_t h, const char *root_path, const char *rel) {
    char abs[CBM_SZ_4K];
    snprintf(abs, sizeof(abs), "%s/%s", root_path, rel);
    struct stat st;
    if (stat(abs, &st) == 0) {
        int64_t mt = sig_stat_mtime_ns(&st);
        int64_t sz = (int64_t)st.st_size;
        h = sig_fold(h, &mt, sizeof(mt));
        h = sig_fold(h, &sz, sizeof(sz));
    }
    return h;
}

/* Signature of the current dirty state: FNV-1a over the entries of
 * `git status --porcelain -uall -z` plus each listed path's (size, mtime).