This removes some Debugf() calls and chages some direct prints to
Debugf(). This means we don't get a bunch of spew when running the
tests.
Upstream-commit: 6094257b28f2e4b5e1a6616c77961b5cec0c9195
Component: engine
This means the default is "docker-*", but for tests we get separate
prefixes for each test.
Upstream-commit: 8e7cbbff504b1d5b0680d2a14821d1d7b0757ab0
Component: engine
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
Upstream-commit: 374a5e9913112c5bde590e532bc0ba5e4afeda49
Component: engine
