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moby--moby/daemon/graphdriver/driver_unsupported.go
Kir Kolyshkin 17708e72a7 graphdriver: custom build-time priority list
Add a way to specify a custom graphdriver priority list
during build. This can be done with something like

  go build -ldflags "-X github.com/docker/docker/daemon/graphdriver.priority=overlay2,devicemapper"

As ldflags are already used by the engine build process, and it seems
that only one (last) `-ldflags` argument is taken into account by go,
an envoronment variable `DOCKER_LDFLAGS` is introduced in order to
be able to append some text to `-ldflags`. With this in place,
using the feature becomes

  make DOCKER_LDFLAGS="-X github.com/docker/docker/daemon/graphdriver.priority=overlay2,devicemapper" dynbinary

The idea behind this is, the priority list might be different
for different distros, so vendors are now able to change it
without patching the source code.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
2017-11-16 19:43:34 -08:00

13 lines
286 B
Go

// +build !linux,!windows,!freebsd
package graphdriver
var (
// List of drivers that should be used in an order
priority = "unsupported"
)
// GetFSMagic returns the filesystem id given the path.
func GetFSMagic(rootpath string) (FsMagic, error) {
return FsMagicUnsupported, nil
}