kolayne/docker-on-top

Docker volume driver: mount host directory with copy-on-write

👋 Hey there! It's Nikolay Nechaev aka @kolayne

A Russian developer and a student at Innopolis University.

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docker-on-top's Issues

Actualize readme

Feature: discard modifications

Give user a choice (via an option on volume creation) whether the changes made in the volume should be discarded on unmount or be preserved for the following volume mount

Add tests

Add tests for basic usage scenarios

Add CI

Check that the plugin builds. Later, probably, run tests

Thread-safety!

Turned out plugins built with go-plugins-helpers are multi-threaded... Need to fix two kinds of race conditions:

1. Per-volume races - parallel mounts and unmounts for different containers
2. Global races - parallel volume creation/deletion

This will likely be convenient to implement together with the volume storage (#7), as we could try to shift the synchronization responsibility (to avoid the above race conditions) to the driver of the filesystem where the plugin data is stored

Core functionality

Implement the core functionality - mounting a user-provided directory with an overlay

Feature: preserve volumes list on plugin restart

Feature: disable COW

The overlay filesystem imposes some limitations, for example, it has undefined behavior if the files in lowerdirs change while it is mounted. Give users an option to disable copy-on-write so that a straightforward recursive copy of the base directory is used