Alexander Larsson 374a5e9913 devmapper: Add DeviceSet device-mapper helper ... This is a module that uses the device-mapper create CoW snapshots You instantiate a DeviceSetDM object on a specified root (/var/lib/docker), and it will create a subdirectory there called "loopback". It will contain two sparse files which are loopback mounted into a thin-pool device-mapper device called "docker-pool". We then create a base snapshot in the pool with an empty filesystem which can be used as a base for docker snapshots. It also keeps track of the mapping between docker image ids and the snapshots in the pool. Typical use of is something like (without error checking): devices = NewDeviceSetDM("/var/lib/docker") devices.AddDevice(imageId, "") // "" is the base image id devices.MountDevice(imageId, "/mnt/image") ... extract base image to /mnt/image devices.AddDevice(containerId, imageId) devices.MountDevice(containerId, "/mnt/container") ... start container at /mnt/container		2013-09-30 17:34:58 -06:00
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deviceset_devmapper.go	devmapper: Add DeviceSet device-mapper helper	2013-09-30 17:34:58 -06:00
devmapper.go	Add libdevmapper wrapper	2013-09-30 17:34:58 -06:00