Struct TreeTxn 

pub struct TreeTxn { /* private fields */ }

Implementations

impl TreeTxn

pub fn write_file( &mut self, rel: &Path, source: Source<'_>, mode: u32, mtime: FileTime, ) -> Result<(), TreeError>

Writes rel in place when it is a regular file, so hard links to it see the new bytes as they would after the command ran for real.

pub fn create_dir( &mut self, rel: &Path, mode: u32, mtime: FileTime, ) -> Result<(), TreeError>

Creates the directory rel, leaving one that exists, or a link to one inside the root, as it is, as mkdir -p would. Any other entry there is refused, since the run saw none. Its mode and mtime are set once every other write has landed, so a read-only directory still takes its contents and their creation does not move its mtime.

pub fn create_symlink( &mut self, rel: &Path, target: &Path, mtime: FileTime, ) -> Result<(), TreeError>

Creates the symlink rel holding target, which is never followed. The name must be free, as ln -s needs it: an entry the run replaced is removed first by its own deletion.

pub fn set_dir_attrs( &mut self, rel: &Path, mode: Option<u32>, mtime: Option<FileTime>, ) -> Result<(), TreeError>

Gives the existing directory rel the recorded attributes that are Some, once every other write has landed, as Self::create_dir does for the directories it makes; with mtime None it keeps the mtime it has now. Call it before any write, so a rollback restores the attributes the directory had before the transaction.

pub fn remove(&mut self, rel: &Path) -> Result<(), TreeError>

Removes whatever rel names, a directory with its contents included, and does nothing when it is already absent.