/**
* Begin the file system transaction.
* Create the journal path and copy all files to it from the original path.
*
* @return void
*/
public function begin()
{
if ($this->inTransaction) {
throw new RuntimeException('Cannot begin - already in a transaction');
}
$this->inTransaction = true;
// Remove possible failed transaction
if (file_exists($this->journalPath)) {
if (!is_dir($this->journalPath)) {
throw new IOException('unrecoverable transaction error: journal path ' . $this->journalPath . ' exists and is not a directory');
}
FS::rmrf($this->journalPath);
}
// Create the journal directory
@mkdir($this->journalPath, 0755, true);
if (!is_dir($this->journalPath)) {
throw new IOException('unrecoverable transaction error: cannot create journal path ' . $this->journalPath);
}
// Set permissions
chmod($this->journalPath, file_exists($this->path) ? fileperms($this->path) : $this->getMode());
// Copy source to the journal
FS::copyDir($this->path, $this->journalPath);
}
