Dague

Build Go projects, better. Based on dagger.

Why?

dague is a docker cli plugin. It acts as a opinionated Go toolchain only relying on Docker as dependency.

You don't need to have the right version of Go or any other dependencies, if you have Docker you have everything.

Installation

1. Download the binary corresponding to your platform from the latest release.

   binaries are available for linux, mac and windows, for amd64 and arm64

2. Rename the binary to docker-dague and make it executable

   chmod +x docker-dague
   

3. On Mac, authorize the binary (as not signed):

   xattr -d com.apple.quarantine docker-dague
   

4. Copy it to the docker directory for CLI plugins:

   mkdir -p ~/.docker/cli-plugins
   install docker-dague ~/.docker/cli-plugins/ 
   

Usage

Configuration is made using a .dague.yml file. This file is mandatory.

Build Targets

If you want to build a binary from main/path to .dist/ this is the minimal file you need:

go:
  build:
    targets:
      local-build:
        path: ./main/path

With that, you can run docker dague go:build local-build and it will build your binary and put it under ./dist/.

The build is performed inside containers, so you don't have to worry about the needed dependencies, tools, versions, etc.

If you want to configure the output directory, set the out key.

Default tools

By default dague comes with handy go tools already configured like:

• go:fmt: runs goimports and a formatter (gofmt by default, but configurable) to re-format the code
• go:lint: runs golangci-lint and govulncheck
• go:doc: generate Go documentation in markdown inside README.me files
• go:test: run go unit tests with handy defaults (-race -cover -shuffle=on)
• go:mod: run go mod tidy and update go.mod and go.sum files

Some subcommands exist, you can see them using the --help flag.

Arbitrary Task Inside Container

It's also possible to define any script that will be run from the inside of the build container. The exec task can also define files to export to the host.

go:
  exec:
    info:
      cmds: |
        uname -a > info.txt
        go version >> info.txt
      export:
        pattern: info.txt
        path: .

Then you can run:

❯ docker dague go:exec info
# ...

❯ cat info.txt
Linux buildkitsandbox 5.15.49-linuxkit #1 SMP PREEMPT Tue Sep 13 07:51:32 UTC 2022 aarch64 Linux
go version go1.19.4 linux/arm64

In comparison, this is the output of go version directly on my host:

❯ go version
go version go1.19.4 darwin/arm64

Arbitrary Tasks on Host

You can also define any arbitrary task to be run on the host:

tasks:
  install:
    deps:
      - go:build local
    cmds: |
      mkdir -p ~/.docker/cli-plugins
      install dist/docker-dague ~/.docker/cli-plugins/docker-dague

The command docker dague task install will first run go:build local then run the shell script to install the binary. The shell script is run using a Go shell implementation so is portable across platforms.

Base Image Configuration

The base image for go tools can be configured:

• the image to use
• apt or apk packages to install
• go packages to install
• mount directories
• environment variables
• caches

For instance, if you want to use gofumpt instead of gofmt, follow this configuration:

go:
  image:
    goPackages:
      - mvdan.cc/gofumpt@latest

  fmt:
    formatter: gofumpt

With that, docker dague go:fmt (or more specifically docker dague go:fmt:write) will now use the specified gofumpt formatter instead of the default gofmt.

go:
  image:
     caches:
        - target: /cache/go
     env:
        GOCACHE: /cache/go
        GOLANGCI_LINT_CACHE: /cache/go

With that, a cache will be mounted and two environment variables are set to reflect it.

Reference

To know more about the possibilities and available configuration, please refer to the configuration reference file.

dague

import "github.com/eunomie/dague"

Index

• func ApkInstall(packages ...string) []string
• func AptInstall(cont *dagger.Container, packages ...string) *dagger.Container
• func Exec(ctx context.Context, src *dagger.Container, args []string) error
• func ExportFilePattern(ctx context.Context, cont *dagger.Container, pattern, path string) error
• func GoInstall(packages ...string) []string
• func RunInDagger(ctx context.Context, do func(*dagger.Client) error) error

func ApkInstall

func ApkInstall(packages ...string) []string

ApkInstall runs the apk add command with the specified packaged, to install packages on alpine based systems. Example:

c.Container().From("alpine").WithExec(ApkInstall("build-base"))

func AptInstall

func AptInstall(cont *dagger.Container, packages ...string) *dagger.Container

AptInstall runs apt-get to install the specified packages. It updates first, install, then clean and remove apt-get lists. Example:

dague.AptInstall(c.Container().From("debian"), "gcc", "git")

func Exec

func Exec(ctx context.Context, src *dagger.Container, args []string) error

Exec runs the specified command and check the error and exit code. Example:

err := dague.Exec(ctx, c.Container().From("golang"), []string{"go", "build"})

func ExportFilePattern

func ExportFilePattern(ctx context.Context, cont *dagger.Container, pattern, path string) error

func GoInstall

func GoInstall(packages ...string) []string

GoInstall installs the specified go packages. Example:

c.Container().From("golang").WithExec(GoInstall("golang.org/x/vuln/cmd/govulncheck@latest"))

func RunInDagger

func RunInDagger(ctx context.Context, do func(*dagger.Client) error) error

RunInDagger initialize the dagger client and close it. In between it runs the specified function. Example:

dague.RunInDagger(ctx, func(c *dagger.Client) error {
    c.Container().From("alpine")
})

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