Function resolveParent

packages/dofs/src/fs/writeFile.ts:43–72

(db: Database, parts: string[], canonical: string)

// final segment is handled by the caller. Returns the parent inode or
// throws ENOENT/ENOTDIR.
function resolveParent(db: Database, parts: string[], canonical: string): number {
  let parentInode = ROOT_INODE;
  for (let i = 0; i < parts.length - 1; i++) {
    const name = parts[i];
    const child = db.one<{ child_inode: number }>(
      "SELECT child_inode FROM vfs_dirents WHERE parent_inode = ? AND name = ?",
      parentInode,
      name,
    );
    if (child === undefined) {
      throw createWorkspaceError("ENOENT", `parent directory missing: ${canonical}`, canonical);
    }
    const next = db.one<{ inode: number; type: "file" | "dir" }>(
      "SELECT inode, type FROM vfs_nodes WHERE inode = ?",
      child.child_inode,
    );
    if (next === undefined) {
      throw createWorkspaceError("ENOENT", `dangling dirent: ${canonical}`, canonical);
    }
    if (next.type !== "dir") {
      throw createWorkspaceError(
        "ENOTDIR",
        `parent path segment is not a directory: ${canonical}`,
        canonical,
      );
    }
    parentInode = next.inode;
  }
  return parentInode;
}

async function materialize(content: string | Uint8Array): Promise<Uint8Array> {
  if (typeof content === "string") {