To update containerd with go mod, it is NOT possible to simply do:
```
go get github.com/containerd/containerd@7c1e88399ec0
```
because it would result in:
```
v1.2.1-0.20190507210959-7c1e88399ec0
```
which is an incorrect version prefix as we want the commit 7c1e88399
from master to have higher priority than a tagged version such as v1.2.*
We want to use a `v1.3.0-0.` prefix even though v1.3.* tags do not exist,
so that when they do, those do have higher priority compared to 7c1e88399.
In other words, containerd's master branch corresponds to a v1.3 dev branch.
The following was thus used to update containerd:
```
go get -d github.com/containerd/containerd@v1.3.0-0.20190507210959-7c1e88399ec0
go get -d github.com/opencontainers/runc@v1.0.0-rc8
make vendor
```
Signed-off-by: Tibor Vass <tibor@docker.com>
go get -u github.com/tiborvass/gomod
GO111MODULE=on gomod init
GO111MODULE=on go mod tidy
GO111MODULE=on go mod vendor
Signed-off-by: Tibor Vass <tibor@docker.com>
Akihiro Suda
Tibor Vass
Tonis Tiigi
Akihiro Suda
Derek McGowan