Function createFileSync

packages/dofs/src/fs/writeFile.ts:481–515

(
  db: Database,
  path: string,
  options: WriteFileOptions,
  now: () => number,
)

}

export function createFileSync(
  db: Database,
  path: string,
  options: WriteFileOptions,
  now: () => number,
): void {
  const { path: canonical } = canonicalizePath(path);
  assertNotReadOnly(db, canonical);
  const [parentInode, leafName] = parentAndNameForResolvedPath(db, path);
  const mode = (options.mode ?? 0o644) & 0o7777;
  const mtime = now();

  db.transactionSync(() => {
    const existing = db.one<{ child_inode: number }>(
      "SELECT child_inode FROM vfs_dirents WHERE parent_inode = ? AND name = ?",
      parentInode,
      leafName,
    );
    if (existing !== undefined) {
      throw createWorkspaceError("EEXIST", `path exists: ${canonical}`, canonical);
    }
    const rev = incrementRev(db);
    // INSERT with RETURNING folds the last_insert_rowid lookup into
    // the same statement, and computing rev up front lets us write
    // the node row with its final stamp in one shot.
    const row = db.one<{ inode: number }>(
      "INSERT INTO vfs_nodes (type, mode, mtime, rev, manifest_hash) VALUES ('file', ?, ?, ?, NULL) RETURNING inode",
      mode,
      mtime,
      rev,
    );
    if (row === undefined) throw createWorkspaceError("EIO", "failed to allocate inode");
    insertFileDirent(db, parentInode, leafName, row.inode, canonical);
  });
}

// Open a write buffer for an existing file. Subsequent writes,
// truncates, and reads against the same Database operate on the