next-gen builder

Signed-off-by: Jacob Blain Christen <[email protected]>

.dockerignore

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+/k3c

.gitignore

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+.dapper
+/.idea/
+/dist/
+/bin/
+/k3c
+/vendor/

.golangci.json

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+{
+	"linters": {
+		"disable-all": true,
+		"enable": [
+			"govet",
+			"golint",
+			"goimports",
+			"misspell",
+			"ineffassign",
+			"gofmt"
+		]
+	},
+	"run": {
+		"skip-files": [
+			"/zz_generated_"
+		],
+		"deadline": "5m"
+	},
+    "issues": {
+        "exclude-rules": [
+            {
+                "path":"cmd",
+                "text":"don't use underscores in Go names",
+                "linters":["golint"]
+            },
+            {
+                "path":"cmd",
+                "text":"struct field .* should be",
+                "linters":["golint"]
+            }
+
+        ]
+    }
+}

Dockerfile

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+ARG GOLANG=golang:1.15-alpine
+FROM ${GOLANG} AS build
+RUN apk --no-cache add \
+    file \
+    gcc \
+    git \
+    libseccomp-dev \
+    libselinux-dev \
+    make \
+    musl-dev \
+    protobuf-dev \
+    protoc
+RUN GO111MODULE=on go get github.com/gogo/protobuf/[email protected]
+COPY . /go/src/k3c
+WORKDIR /go/src/k3c
+ENV CGO_ENABLED=1
+ENV GO_BUILDTAGS="seccomp,selinux,static_build,netgo,osusergo"
+RUN go mod vendor
+RUN go generate -x
+#RUN go build -ldflags '-w -linkmode=external -extldflags=-static' -tags="${GO_BUILDTAGS}" -o /usr/local/bin/k3c .
+RUN go build -ldflags '-w -extldflags=-static' -tags="${GO_BUILDTAGS}" -o /usr/local/bin/k3c .
+RUN file /usr/local/bin/k3c
+
+FROM scratch AS release
+COPY --from=build /usr/local/bin/k3c /bin/k3c
+ENTRYPOINT ["k3c"]
+CMD ["--help"]

LICENSE

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+
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+

README.md

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+k3c - Classic Docker (Build) for a Kubernetes world
+===========================================
+
+***STATUS: EXPERIMENT - Let us know what you think***
+
+***NOTE: the original experiment started on `master` while the next-gen work will be on `trunk`***
+
+`k3c` brings the Classic ™ Docker images manipulation UX to your
+`k3s` development workflow. It is designed to enable the rapid feedback
+when developing and testing local container images in `k3s` and `rke2`.
+Currently `k3s`, the [lightweight Kubernetes distribution](https://github.com/k3s-io/k3s),
+provides a great solution for Kubernetes from dev to production.  While
+`k3s` satisifies the Kubernetes runtime needs, one still needs to run
+`docker` (or a docker-like tool) to actually develop and build the container
+images.  `k3c` is intended to replace `docker` for just the functionality
+needed for building and manipulating images in the Kubernetes ecosystem.
+
+## A familiar UX
+
+There really is nothing better than the classic Docker UX of `build/push/pull/tag`.
+This tool copies the same UX as classic Docker (think Docker v1.12). The intention
+is to follow the same style but not be a 100% drop in replacement.  Behaviour and
+arguments have been changed to better match the behavior of the Kubernetes ecosystem.
+
+## A single binary
+
+`k3c`, similar to `k3s` and old school docker, is packaged as a single binary, because nothing
+is easier for distribution than a static binary.
+
+## Built on Kubernetes Tech (and others)
+
+Fundamentally `k3c` is a built on the [Container Runtime Interface (CRI)](https://github.com/kubernetes/cri-api),
+[containerd](https://github.com/containerd/containerd), and [buildkit](https://github.com/moby/buildkit).
+
+## Architecture
+
+`k3c` enables building `k3s`-local images by installing a DaemonSet Pod that runs both `buildkitd` and `k3c agent`
+and exposing the gRPC endpoints for these active agents in your cluster via a Service. Once installed, the `k3c` CLI
+can inspect your installation and communicate with the backend daemons for image building and manipulation with merely
+the KUBECONFIG that was available when invoking `k3c install`. When building `k3c` will talk directly to the `buildkit`
+service but all other interactions with the underlying containerd/CRI are mediated by the `k3c agent` (primarily
+because the `containerd` client code assumes a certain level of co-locality with the `containerd` installation).
+
+## Building
+
+```bash
+# more to come on this front but builds are currently a very manual affair
+# git clone --branch=trunk https://github.com/rancher/k3c.git ~/Projects/rancher/k3c
+# cd ~/Projects/rancher/k3c
+go generate # only necessary when modifying the gRPC protobuf IDL, see Dockerfile for pre-reqs
+go build -ldflags '-w -extldflags=-static' -tags="seccomp,selinux,static_build,netgo,osusergo" .
+```
+
+## Running
+
+Have a working `k3s` installation with a working `$HOME/.kube/config` or `$KUBECONFIG`, then:
+
+```bash
+# Installation on a single-node cluster
+./k3c install
+```
+
+```bash
+# Installation on a multi-node cluster, targeting a Node named "my-builder-node"
+./k3c install --selector k3s.io/hostname=my-builder-node 
+
+```
+
+`k3c` currently works against a single builder node so you must specify a narrow selector when
+installing on multi-node clusters. Upon successful installation this node will acquire the "builder" role.
+
+Build images like you would with `docker`
+
+```
+$ ./k3c --help
+Usage:
+  k3c [flags]
+  k3c [command]
+
+Available Commands:
+  build       Build an image
+  help        Help about any command
+  images      List images
+  install     Install builder component(s)
+  pull        Pull an image
+  push        Push an image
+  rmi         Remove an image
+  tag         Tag an image
+  uninstall   Uninstall builder component(s)
+
+Flags:
+  -x, --context string      kubeconfig context for authentication
+      --debug               
+      --debug-level int     
+  -h, --help                help for k3c
+  -k, --kubeconfig string   kubeconfig for authentication
+  -n, --namespace string    namespace (default "k3c")
+  -v, --version             version for k3c
+
+Use "k3c [command] --help" for more information about a command.
+```
+
+## Roadmap
+
+- Automated builds for clients on MacOS (amd64/arm64), Windows (amd64), and Linux client/server (amd64/arm64/arm).
+
+# License
+
+Copyright (c) 2020-2021 [Rancher Labs, Inc.](http://rancher.com)
+
+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](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.
+