Add build tag no_ipfs

.github/workflows/job-build.yml

@@ -99,3 +99,12 @@ jobs:
           build linux s390x
 
           [ ! "$failure" ] || exit 1
+
+      - if: ${{ env.GO_VERSION != '' }}
+        name: "Run: make binaries with csustom BUILDTAGS"
+        run: |
+          set -eux
+          # no_ipfs: make sure it does not incur any IPFS-related dependency
+          go mod vendor
+          rm -rf vendor/github.com/ipfs vendor/github.com/multiformats
+          BUILDTAGS=no_ipfs make binaries

BUILDING.md

@@ -0,0 +1,22 @@
+# Building nerdctl
+
+To build nerdctl, use `make`:
+
+```bash
+make
+sudo make install
+```
+
+Alternatively, nerdctl can be also built with `go build ./cmd/nerdctl`.
+However, this is not recommended as it does not populate the version string (`nerdctl -v`).
+
+## Customization
+
+To specify build tags, set the `BUILDTAGS` variable as follows:
+
+```bash
+BUILDTAGS=no_ipfs make
+```
+
+The following build tags are supported:
+* `no_ipfs` (since v2.1.3): Disable IPFS

Makefile

@@ -46,6 +46,13 @@ LINT_COMMIT_RANGE ?= main..HEAD
 GO_BUILD_LDFLAGS ?= -s -w
 GO_BUILD_FLAGS ?=
 
+# BUILDTAGS variable names correspond to containerd
+ifdef BUILDTAGS
+    GO_BUILDTAGS = ${BUILDTAGS}
+endif
+GO_BUILDTAGS ?=
+GO_TAGS=$(if $(GO_BUILDTAGS),-tags "$(strip $(GO_BUILDTAGS))",)
+
 ##########################
 # Helpers
 ##########################
@@ -54,7 +61,7 @@ ifdef VERBOSE
 	VERBOSE_FLAG_LONG := --verbose
 endif
 
-export GO_BUILD=CGO_ENABLED=0 GOOS=$(GOOS) $(GO) -C $(MAKEFILE_DIR) build -ldflags "$(GO_BUILD_LDFLAGS) $(VERBOSE_FLAG) -X $(PACKAGE)/pkg/version.Version=$(VERSION) -X $(PACKAGE)/pkg/version.Revision=$(REVISION)"
+export GO_BUILD=CGO_ENABLED=0 GOOS=$(GOOS) $(GO) -C $(MAKEFILE_DIR) build $(GO_TAGS) -ldflags "$(GO_BUILD_LDFLAGS) $(VERBOSE_FLAG) -X $(PACKAGE)/pkg/version.Version=$(VERSION) -X $(PACKAGE)/pkg/version.Revision=$(REVISION)"
 
 ifndef NO_COLOR
     NC := \033[0m

pkg/ipfs/image.go → pkg/ipfs/image_ipfs.go

@@ -1,3 +1,5 @@
+//go:build !no_ipfs
+
 /*
    Copyright The containerd Authors.
 

pkg/ipfs/image_noipfs.go

@@ -0,0 +1,39 @@
+//go:build no_ipfs
+
+/*
+   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 ipfs
+
+import (
+	"context"
+
+	containerd "github.com/containerd/containerd/v2/client"
+	"github.com/containerd/containerd/v2/core/images/converter"
+
+	"github.com/containerd/nerdctl/v2/pkg/api/types"
+	"github.com/containerd/nerdctl/v2/pkg/imgutil"
+)
+
+// EnsureImage pull the specified image from IPFS.
+func EnsureImage(ctx context.Context, client *containerd.Client, scheme, ref, ipfsPath string, options types.ImagePullOptions) (*imgutil.EnsuredImage, error) {
+	return nil, ErrNotImplemented
+}
+
+// Push pushes the specified image to IPFS.
+func Push(ctx context.Context, client *containerd.Client, rawRef string, layerConvert converter.ConvertFunc, allPlatforms bool, platform []string, ensureImage bool, ipfsPath string) (string, error) {
+	return "", ErrNotImplemented
+}

pkg/ipfs/noipfs.go

@@ -0,0 +1,25 @@
+/*
+   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 ipfs
+
+import (
+	"fmt"
+
+	"github.com/containerd/errdefs"
+)
+
+var ErrNotImplemented = fmt.Errorf("%w: ipfs is disabled by the distributor of this build", errdefs.ErrNotImplemented)