Introduce a new go module - containerd/api for use in standalone clients

In containerd 1.5.x, we introduced support for go modules by adding a
go.mod file in the root directory. This go.mod lists all the things
needed across the whole code base (with the exception of
integration/client which has its own go.mod). So when projects that
need to make calls to containerd API will pull in some code from
containerd/containerd, the `go mod` commands will add all the things
listed in the root go.mod to the projects go.mod file. This causes
some problems as the list of things needed to make a simple API call
is enormous. in effect, making a API call will pull everything that a
typical server needs as well as the root go.mod is all encompassing.
In general if we had smaller things folks could use, that will make it
easier by reducing the number of things that will end up in a consumers
go.mod file.

Now coming to a specific problem, the root containerd go.mod has various
k8s.io/* modules listed. Also kubernetes depends on containerd indirectly
via both moby/moby (working with docker maintainers seperately) and via
google/cadvisor. So when the kubernetes maintainers try to use latest
1.5.x containerd, they will see the kubernetes go.mod ending up depending
on the older version of kubernetes!

So if we can expose just the minimum things needed to make a client API
call then projects like cadvisor can adopt that instead of pulling in
the entire go.mod from containerd. Looking at the existing code in
cadvisor the minimum things needed would be the api/ directory from
containerd. Please see proof of concept here:
github.com/google/cadvisor/pull/2908

To enable that, in this PR, we add a go.mod file in api/ directory. we
split the Protobuild.yaml into two, one for just the things in api/
directory and the rest in the root directory. We adjust various targets
to build things correctly using `protobuild` and also ensure that we
end up with the same generated code as before as well. To ensure we
better take care of the various go.mod/go.sum files, we update the
existing `make vendor` and also add a new `make verify-vendor` that one
can run locally as well in the CI.

Ideally, we would have a `containerd/client` either as a standalone repo
or within `containerd/containerd` as a separate go module. but we will
start here to experiment with a standalone api go module first.

Also there are various follow ups we can do, for example @thaJeztah has
identified two tasks we could do after this PR lands:

github.com/containerd/pull/5716#discussion_r668821396

Signed-off-by: Davanum Srinivas <[email protected]>

.github/workflows/ci.yml

@@ -69,6 +69,11 @@ jobs:
         with:
           working-directory: src/github.com/containerd/containerd
 
+      - name: verify go modules and vendor directory
+        run: |
+          make verify-vendor
+        working-directory: src/github.com/containerd/containerd
+
   #
   # Protobuf checks
   #

Makefile

@@ -95,6 +95,8 @@ SHIM_GO_LDFLAGS=-ldflags '-X $(PKG)/version.Version=$(VERSION) -X $(PKG)/version
 
 # Project packages.
 PACKAGES=$(shell $(GO) list ${GO_TAGS} ./... | grep -v /vendor/ | grep -v /integration)
+API_PACKAGES=$(shell (cd api && $(GO) list ${GO_TAGS} ./... | grep -v /vendor/ | grep -v /integration))
+NON_API_PACKAGES=$(shell $(GO) list ${GO_TAGS} ./... | grep -v /vendor/ | grep -v /integration | grep -v "containerd/api")
 TEST_REQUIRES_ROOT_PACKAGES=$(filter \
     ${PACKAGES}, \
     $(shell \
@@ -156,7 +158,13 @@ generate: protos
 
 protos: bin/protoc-gen-gogoctrd ## generate protobuf
 	@echo "$(WHALE) $@"
-	@PATH="${ROOTDIR}/bin:${PATH}" protobuild --quiet ${PACKAGES}
+	@find . -path ./vendor -prune -false -o -name '*.pb.go' | xargs rm
+	$(eval TMPDIR := $(shell mktemp -d))
+	@mv ${ROOTDIR}/vendor $TMPDIR
+	@(cd ${ROOTDIR}/api && PATH="${ROOTDIR}/bin:${PATH}" protobuild --quiet ${API_PACKAGES})
+	@(PATH="${ROOTDIR}/bin:${PATH}" protobuild --quiet ${NON_API_PACKAGES})
+	@mv $TMPDIR ${ROOTDIR}/vendor
+	@rm -rf $TMPDIR
 
 check-protos: protos ## check if protobufs needs to be generated again
 	@echo "$(WHALE) $@"
@@ -400,10 +408,24 @@ root-coverage: ## generate coverage profiles for unit tests that require root
 		fi; \
 	done )
 
-vendor: ## vendor
+vendor: ## ensure all the go.mod/go.sum files are up-to-date including vendor/ directory
 	@echo "$(WHALE) $@"
 	@$(GO) mod tidy
 	@$(GO) mod vendor
+	@$(GO) mod verify
+	@(cd ${ROOTDIR}/api && ${GO} mod tidy)
+	@(cd ${ROOTDIR}/integration/client && ${GO} mod tidy)
+
+verify-vendor: ## verify if all the go.mod/go.sum files are up-to-date
+	@echo "$(WHALE) $@"
+	$(eval TMPDIR := $(shell mktemp -d))
+	@cp -R ${ROOTDIR} ${TMPDIR}
+	@(cd ${TMPDIR}/containerd && ${GO} mod tidy)
+	@(cd ${TMPDIR}/containerd/api && ${GO} mod tidy)
+	@(cd ${TMPDIR}/containerd/integration/client && ${GO} mod tidy)
+	@diff -r -u -q ${ROOTDIR} ${TMPDIR}/containerd
+	@rm -rf ${TMPDIR}
+
 
 help: ## this help
 	@awk 'BEGIN {FS = ":.*?## "} /^[a-zA-Z_-]+:.*?## / {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}' $(MAKEFILE_LIST) | sort

Protobuild.toml

@@ -31,28 +31,11 @@ plugins = ["grpc", "fieldpath"]
   "google/protobuf/duration.proto" = "github.com/gogo/protobuf/types"
   "google/rpc/status.proto" = "github.com/gogo/googleapis/google/rpc"
 
-[[overrides]]
-prefixes = ["github.com/containerd/containerd/api/events"]
-plugins = ["fieldpath"] # disable grpc for this package
-
-[[overrides]]
-prefixes = ["github.com/containerd/containerd/api/services/ttrpc/events/v1"]
-plugins = ["ttrpc", "fieldpath"]
-
 [[overrides]]
 # enable ttrpc and disable fieldpath and grpc for the shim
 prefixes = ["github.com/containerd/containerd/runtime/v1/shim/v1", "github.com/containerd/containerd/runtime/v2/task"]
 plugins = ["ttrpc"]
 
-# Aggregrate the API descriptors to lock down API changes.
-[[descriptors]]
-prefix = "github.com/containerd/containerd/api"
-target = "api/next.pb.txt"
-ignore_files = [
-	"google/protobuf/descriptor.proto",
-	"gogoproto/gogo.proto"
-]
-
 # Lock down runc config
 [[descriptors]]
 prefix = "github.com/containerd/containerd/runtime/linux/runctypes"

api/Protobuild.toml

@@ -0,0 +1,54 @@
+version = "unstable"
+generator = "gogoctrd"
+plugins = ["grpc", "fieldpath"]
+
+# Control protoc include paths. Below are usually some good defaults, but feel
+# free to try it without them if it works for your project.
+[includes]
+  # Include paths that will be added before all others. Typically, you want to
+  # treat the root of the project as an include, but this may not be necessary.
+  before = []
+
+  # Paths that should be treated as include roots in relation to the vendor
+  # directory. These will be calculated with the vendor directory nearest the
+  # target package.
+  packages = ["github.com/gogo/protobuf", "github.com/gogo/googleapis"]
+
+  # Paths that will be added untouched to the end of the includes. We use
+  # `/usr/local/include` to pickup the common install location of protobuf.
+  # This is the default.
+  after = ["/usr/local/include"]
+
+# This section maps protobuf imports to Go packages. These will become
+# `-M` directives in the call to the go protobuf generator.
+[packages]
+  "gogoproto/gogo.proto" = "github.com/gogo/protobuf/gogoproto"
+  "google/protobuf/any.proto" = "github.com/gogo/protobuf/types"
+  "google/protobuf/empty.proto" = "github.com/gogo/protobuf/types"
+  "google/protobuf/descriptor.proto" = "github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
+  "google/protobuf/field_mask.proto" = "github.com/gogo/protobuf/types"
+  "google/protobuf/timestamp.proto" = "github.com/gogo/protobuf/types"
+  "google/protobuf/duration.proto" = "github.com/gogo/protobuf/types"
+  "google/rpc/status.proto" = "github.com/gogo/googleapis/google/rpc"
+
+[[overrides]]
+prefixes = ["github.com/containerd/containerd/api/events"]
+plugins = ["fieldpath"] # disable grpc for this package
+
+[[overrides]]
+prefixes = ["github.com/containerd/containerd/api/services/ttrpc/events/v1"]
+plugins = ["ttrpc", "fieldpath"]
+
+[[overrides]]
+# enable ttrpc and disable fieldpath and grpc for the shim
+prefixes = ["github.com/containerd/containerd/runtime/v1/shim/v1", "github.com/containerd/containerd/runtime/v2/task"]
+plugins = ["ttrpc"]
+
+# Aggregrate the API descriptors to lock down API changes.
+[[descriptors]]
+prefix = "github.com/containerd/containerd/api"
+target = "next.pb.txt"
+ignore_files = [
+	"google/protobuf/descriptor.proto",
+	"gogoproto/gogo.proto"
+]

api/doc.go

@@ -0,0 +1,17 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package api

api/go.mod

@@ -0,0 +1,17 @@
+module github.com/containerd/containerd/api
+
+go 1.16
+
+require (
+	github.com/containerd/ttrpc v1.0.2
+	github.com/containerd/typeurl v1.0.2
+	github.com/gogo/googleapis v1.4.0
+	github.com/gogo/protobuf v1.3.2
+	github.com/opencontainers/go-digest v1.0.0
+	google.golang.org/grpc v1.38.0
+)
+
+replace (
+	github.com/gogo/googleapis => github.com/gogo/googleapis v1.3.2
+	google.golang.org/genproto => google.golang.org/genproto v0.0.0-20200224152610-e50cd9704f63
+)

api/go.sum

@@ -0,0 +1,126 @@
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+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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+github.com/containerd/ttrpc v1.0.2 h1:2/O3oTZN36q2xRolk0a2WWGgh7/Vf/liElg5hFYLX9U=
+github.com/containerd/ttrpc v1.0.2/go.mod h1:UAxOpgT9ziI0gJrmKvgcZivgxOp8iFPSk8httJEt98Y=
+github.com/containerd/typeurl v1.0.2 h1:Chlt8zIieDbzQFzXzAeBEF92KhExuE4p9p92/QmY7aY=
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+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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api/next.pb.txt

@@ -2389,6 +2389,7 @@ file {
     java_outer_classname: "StatusProto"
     java_multiple_files: true
     go_package: "rpc"
+    cc_enable_arenas: true
     objc_class_prefix: "RPC"
   }
   syntax: "proto3"

api/services/containers/v1/doc.go

@@ -0,0 +1,17 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package containers