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Data Model

Files

Files in Doozer are organized in a tree, much like in Unix. Each directory contains a list of names that correspond to other directories or files. Each file contains a sequence of bytes that can be read or written. The root of the store is the directory /. The sequence of names leading from the root to any given file, including the filename, constitutes a path that uniquely identifies the file. Paths are notated by joining all the names with / between them.

For example, /foo/bar/baz refers to the file baz, inside the directory bar, inside the directory foo, inside the root directory.

Naming files

Names are UTF-8 character strings that contain only ASCII letters, numbers, ., or -.

NOTE: This may seem ironic but we are keeping the door open to lift some of the restrictions.

Read/Write

Users are limited to whole-file read and writes. Users can only read a whole file or write over a whole file.

Revisions

Changes to the store (i.e. creating, updating, or deleting a file) are applied, one at a time, in sequence. Every change creates a new version of the store with one difference from the previous version. Every version of the store gets assigned an integer, its rev, one greater than the previous rev. Previous revisions are kept for reference until some time later.

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