multi: add release helper docker file

.github/workflows/main.yml

@@ -23,6 +23,7 @@ env:
   # /.travis.yml
   # /Dockerfile
   # /dev.Dockerfile
+  # /make/builder.Dockerfile
   # /.github/workflows/release.yml
   GO_VERSION: 1.15.6
 

.github/workflows/release.yaml

@@ -14,6 +14,7 @@ env:
   # /.travis.yml
   # /Dockerfile
   # /dev.Dockerfile
+  # /make/builder.Dockerfile
   # /.github/workflows/main.yml
   GO_VERSION: 1.15.6
 

.travis.yml

@@ -19,6 +19,7 @@ go:
   # If you change this value, please change it in the following files as well:
   # /Dockerfile
   # /dev.Dockerfile
+  # /make/builder.Dockerfile
   # /.github/workflows/main.yml
   # /.github/workflows/release.yml
   - "1.15.6"

Dockerfile

@@ -1,3 +1,9 @@
+# If you change this value, please change it in the following files as well:
+# /.travis.yml
+# /dev.Dockerfile
+# /make/builder.Dockerfile
+# /.github/workflows/main.yml
+# /.github/workflows/release.yml
 FROM golang:1.15.6-alpine as builder
 
 # Force Go to use the cgo based DNS resolver. This is required to ensure DNS

Makefile

@@ -156,6 +156,14 @@ release:
 	$(VERSION_CHECK)
 	./scripts/release.sh build-release "$(VERSION_TAG)" "$(BUILD_SYSTEM)" "$(RELEASE_TAGS)" "$(RELEASE_LDFLAGS)"
 
+docker-release:
+	@$(call print, "Building release helper docker image.")
+	if [ "$(tag)" = "" ]; then echo "Must specify tag=<commit_or_tag>!"; exit 1; fi
+
+	docker build -t lnd-release-helper -f make/builder.Dockerfile make/
+	$(DOCKER_RELEASE_HELPER) scripts/release.sh check-tag "$(VERSION_TAG)"
+	$(DOCKER_RELEASE_HELPER) scripts/release.sh build-release "$(VERSION_TAG)" "$(BUILD_SYSTEM)" "$(RELEASE_TAGS)" "$(RELEASE_LDFLAGS)"
+
 scratch: build
 
 

dev.Dockerfile

@@ -1,3 +1,9 @@
+# If you change this value, please change it in the following files as well:
+# /.travis.yml
+# /Dockerfile
+# /make/builder.Dockerfile
+# /.github/workflows/main.yml
+# /.github/workflows/release.yml
 FROM golang:1.15.6-alpine as builder
 
 LABEL maintainer="Olaoluwa Osuntokun <laolu@lightning.engineering>"

docs/release.md

@@ -10,7 +10,23 @@ utilize a work around needed until `go1.13.2`.
 
 ## Building a New Release
 
-### macOS/Linux/Windows (WSL)
+### MacOS
+
+The first requirement is to have [`docker`](https://www.docker.com/)
+installed locally and running. The second requirement is to have `make`
+installed. Everything else (including `golang`) is included in the release
+helper image.
+
+To build a release, run the following commands:
+
+1. `git clone https://github.com/lightningnetwork/lnd.git`
+2. `cd lnd`
+3. `git checkout <TAG> # <TAG> is the name of the next release/tag`
+4. `make docker-release tag=<TAG>`
+
+Where `<TAG>` is the name of the next release of `lnd`.
+
+### Linux/Windows (WSL)
 
 No prior set up is needed on Linux or macOS is required in order to build the
 release binaries. However, on Windows, the only way to build the release
@@ -19,7 +35,8 @@ the release binaries following these steps:
 
 1. `git clone https://github.com/lightningnetwork/lnd.git`
 2. `cd lnd`
-3. `make release tag=<TAG> # <TAG> is the name of the next release/tag`
+3. `git checkout <TAG> # <TAG> is the name of the next release/tag`
+4. `make release tag=<TAG>`
 
 This will then create a directory of the form `lnd-<TAG>` containing archives
 of the release binaries for each supported operating system and architecture,

make/builder.Dockerfile

@@ -0,0 +1,34 @@
+# If you change this value, please change it in the following files as well:
+# /.travis.yml
+# /Dockerfile
+# /dev.Dockerfile
+# /.github/workflows/main.yml
+# /.github/workflows/release.yml
+FROM golang:1.15.6-alpine as builder
+
+MAINTAINER Olaoluwa Osuntokun <laolu@lightning.engineering>
+
+# Golang build related environment variables that are static and used for all
+# architectures/OSes.
+ENV GODEBUG netdns=cgo
+ENV GO111MODULE=auto
+ENV CGO_ENABLED=0
+
+# Set up cache directories. Those will be mounted from the host system to speed
+# up builds. If go isn't installed on the host system, those will fall back to
+# temp directories during the build (see make/release_flags.mk).
+ENV GOCACHE=/tmp/build/.cache
+ENV GOMODCACHE=/tmp/build/.modcache
+
+RUN apk add --no-cache --update alpine-sdk \
+    git \
+    make \
+    tar \
+    zip \
+    bash \
+  && mkdir -p /tmp/build/lnd \
+  && mkdir -p /tmp/build/.cache \
+  && mkdir -p /tmp/build/.modcache \
+  && chmod -R 777 /tmp/build/
+
+WORKDIR /tmp/build/lnd

make/release_flags.mk

@@ -1,6 +1,16 @@
 VERSION_TAG = $(shell date +%Y%m%d)-01
 VERSION_CHECK = @$(call print, "Building master with date version tag")
 
+DOCKER_RELEASE_HELPER = docker run \
+  -it \
+  --rm \
+  --user $(shell id -u):$(shell id -g) \
+  -v $(shell pwd):/tmp/build/lnd \
+  -v $(shell bash -c "go env GOCACHE || (mkdir -p /tmp/go-cache; echo /tmp/go-cache)"):/tmp/build/.cache \
+  -v $(shell bash -c "go env GOMODCACHE || (mkdir -p /tmp/go-modcache; echo /tmp/go-modcache)"):/tmp/build/.modcache \
+  -e SKIP_VERSION_CHECK \
+  lnd-release-helper
+
 BUILD_SYSTEM = darwin-amd64 \
 dragonfly-amd64 \
 freebsd-386 \