Add a CreateFromTemplate() method to graph drivers, and use it instead
of a driver-oblivious diff/put method when we want to create a copy of
an image's top layer that has the same parent and which differs from the
original only in its ID maps.
This lets drivers that can quickly make an independent layer based on
another layer do something smarter than we were doing with the
driver-oblivious method. For some drivers, a native method is
dramatically faster.
Note that the driver needs to be able to do this while still exposing
just one notional layer (i.e., one link in the chain of layers for a
given container) to the higher levels of the APIs, so if the new layer
is actually a child of the template layer, that needs to remain a detail
that's private to the driver.
Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>
This patch adds a MountOpts field to the drivers so we can simplify
the interface to Get and allow additional options to be passed in the future.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Expose reading and writing ID mapping in the archive and chrootarchive
packages, and in the driver interface. Generally this means that
when computing or applying diffs, we need to have ID mappings passed in
that are specific to the layers we're using.
Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>
Add an "echo" driver test, for making sure that we generate diffs
correctly when particular paths are removed in one layer and restored in
a subsequent one.
Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>
Currently when we do a commmit, we are mounting the container without using
the mountlabel. In certain situations we can leak mount points where the
image is already mounted with a label. If you then attempt to commit the
image, the kernel will attempt to mount the image without a label. The
kernel will reject this mount since SELinux does not allow the same image
to be mounted with different labels.
Passing down the label to the diff drivers, fixes this issue.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Wrap graphdriver.{ErrNotSupported,ErrPrerequisites,ErrIncompatibleFS}
errors in contexts using github.com/pkg/errors, and dig them out for
comparison using errors.Cause().
Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>
Rename the library module and CLI wrapper.
Rename daemon/graphdriver to drivers.
Catch up vendoring to match modules we've pruned.
Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>
Nalin Dahyabhai