pub fn volume_lock_dir() -> Result<PathBuf, SqliteError>Expand description
The directory for the SQLite volume lock files, from the single rule in
khive_db::default_volume_lock_dir: KHIVE_VOLUME_LOCK_DIR when set,
else <home>/.khive/sqlite-volume-locks. Unlike khive_dir it has no
last-resort root: without a home directory the result is a configuration
error, because a working-directory-relative lock directory would give two
processes two different lock files.