Add explicit binary version and resurrect "bashbrew.sh" for helping users compile from source

.dockerignore

@@ -1,4 +1,5 @@
 **
+!bashbrew.sh
 !cmd/
 !go.mod
 !go.sum

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
         run: |
           docker build --tag bashbrew --pull .
           docker run --rm bashbrew tar -cC /usr/local/bin bashbrew | tar -xv
-          ./bashbrew --help > /dev/null
+          ./bashbrew --version
       - name: Smoke Test
         run: |
           image='https://github.com/docker-library/official-images/raw/master/library/hello-world'

.gitignore

@@ -0,0 +1 @@
+bin/

Dockerfile

@@ -9,13 +9,14 @@ RUN apt-get update; \
 	rm -rf /var/lib/apt/lists/*
 
 WORKDIR /usr/src/bashbrew
-COPY go.mod go.sum ./
+COPY go.mod go.sum bashbrew.sh ./
 COPY cmd cmd
 COPY vendor vendor
 RUN export CGO_ENABLED=0; \
-	go build -mod vendor -v -o /usr/local/bin/bashbrew ./cmd/bashbrew; \
+	bash -x ./bashbrew.sh --version; \
 	rm -r ~/.cache/go-build; \
-	bashbrew --help > /dev/null
+	mv bin/bashbrew /usr/local/bin/; \
+	bashbrew --version
 
 ENV BASHBREW_CACHE /bashbrew-cache
 # make sure our default cache dir exists and is writable by anyone (similar to /tmp)

README.md

@@ -10,6 +10,9 @@ NAME:
 USAGE:
    bashbrew [global options] command [command options] [arguments...]
 
+VERSION:
+   v0.1.0
+
 COMMANDS:
      list, ls    list repo:tag combinations for a given repo
      build       build (and tag) repo:tag combinations for a given repo
@@ -35,6 +38,7 @@ GLOBAL OPTIONS:
    --library value          where the bodies are buried (default: "/home/tianon/docker/official-images/library") [$BASHBREW_LIBRARY]
    --cache value            where the git wizardry is stashed (default: "/home/tianon/.cache/bashbrew") [$BASHBREW_CACHE]
    --help, -h, -?           show help
+   --version, -v            print the version
 ```
 
 ## Installing

bashbrew.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+# a small shell script to help compile bashbrew
+
+dir="$(readlink -f "$BASH_SOURCE")"
+dir="$(dirname "$dir")"
+
+export GO111MODULE=on
+go build -o bin/bashbrew -mod vendor ./cmd/bashbrew > /dev/null
+
+exec "$dir/bin/bashbrew" "$@"

cmd/bashbrew/main.go

@@ -66,8 +66,7 @@ func main() {
 	app := cli.NewApp()
 	app.Name = "bashbrew"
 	app.Usage = "canonical build tool for the official images"
-	app.Version = "dev"
-	app.HideVersion = true
+	app.Version = version
 	app.EnableBashCompletion = true
 
 	// TODO add "Description" to app and commands (for longer-form description of their functionality)

cmd/bashbrew/version.go

@@ -0,0 +1,3 @@
+package main
+
+const version = "v0.1.0"