After implementing pull, a few changes are required to the content store
interface to make sure that the implementation works smoothly.
Specifically, we work to make sure the predeclaration path for digests
works the same between remote and local writers. Before, we were
hesitent to require the the size and digest up front, but it became
clear that having this provided significant benefit.
There are also several cleanups related to naming. We now call the
expected digest `Expected` consistently across the board and `Total` is
used to mark the expected size.
This whole effort comes together to provide a very smooth status
reporting workflow for image pull and push. This will be more obvious
when the bulk of pull code lands.
There are a few other changes to make `content.WriteBlob` more broadly
useful. In accordance with addition for predeclaring expected size when
getting a `Writer`, `WriteBlob` now supports this fully. It will also
resume downloads if provided an `io.Seeker` or `io.ReaderAt`. Coupled
with the `httpReadSeeker` from `docker/distribution`, we should only be
a lines of code away from resumable downloads.
Signed-off-by: Stephen J Day <stephen.day@docker.com>
This setup will now correctly set the version number from the git tag.
When using `--version`, we will see the binary name, the package it was
built from and a git hash based on the tag:
```console
$./bin/dist -v
./bin/dist github.com/docker/containerd 0b45d91.m
```
Note that in the above example, if we set a tag of `v1.0.0-dev`, that
will show up in the version number, as follows:
```console
$./bin/dist -v
./bin/dist github.com/docker/containerd v1.0.0-dev
```
Once commits are made past that tag, the version number will be
expressed relative to that tag and include a git hash:
```console
$./bin/dist -v
./bin/dist github.com/docker/containerd v1.0.0-dev-1-g7953e96.m
```
Some these examples include a `.m` postfix. This indicates that the
binary was build from a source tree with local modifications.
We can add a dev tag to start getting 1.0 version numbers for test
builds.
Signed-off-by: Stephen J Day <stephen.day@docker.com>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Add registration for more subsystems via plugins
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Move content service to separate package
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
We've moved to using the config, directly. This removes the argument and
gets rid of a few extra lines of code.
Signed-off-by: Stephen J Day <stephen.day@docker.com>
Following from the rest of the work in this branch, we now are porting
the dist command to work directly against the containerd content API.
Signed-off-by: Stephen J Day <stephen.day@docker.com>
After iterating on the GRPC API, the changes required for the actual
implementation are now included in the content store. The begin change
is the move to a single, atomic `Ingester.Writer` method for locking
content ingestion on a key. From this, comes several new interface
definitions.
The main benefit here is the clarification between `Status` and `Info`
that came out of the GPRC API. `Status` tells the status of a write,
whereas `Info` is for querying metadata about various blobs.
Signed-off-by: Stephen J Day <stephen.day@docker.com>
Bring the content service into the containerd API. This allows the
content store to be coordinated in the containerd daemon with minimal
effort. For the most part, this API follows the conventions and behavior
of the existing content store implementation with a few caveats.
Specifically, we remove the object oriented transaction mechanism in
favor of a very rich `Write` call.
Pains are taken to reduce race conditions around when having multiple
writers to a single piece of content. Clients should be able to race
towards getting a write lock on a reference, then wait on each other.
For the most part, this should be generically pluggable to allow
implementations of the content store to be swapped out.
We'll follow this up with an implementation to validate the model.
Signed-off-by: Stephen J Day <stephen.day@docker.com>
Updates to the gogo/protobuf dependency are required to correctly
generate time types. We also remove an unused windows dependency.
Signed-off-by: Stephen J Day <stephen.day@docker.com>
This adds a config file for containerd configuration. It is hard to
have structure data on cli flags and the config file should be used for
the majority of fields when configuring containerd.
There are still a few flags on the daemon that override config file
values but flags should take a back seat going forward and should be
kept at a minimum.
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
