xcaddy

README

xcaddy - Custom Caddy Builder

This command line tool and associated Go package makes it easy to make custom builds of the Caddy Web Server.

It is used heavily by Caddy plugin developers as well as anyone who wishes to make custom caddy binaries (with or without plugins).

⚠️ Still in development. Supports Caddy 2 only.

Stay updated, be aware of changes, and please submit feedback! Thanks!

Requirements

• Go installed

Install

You can download binaries that are already compiled for your platform, or build xcaddy from source:

$ go get -u github.com/caddyserver/xcaddy/cmd/xcaddy

Command usage

The xcaddy command has two primary uses:

1. Compile custom caddy binaries
2. A replacement for go run while developing Caddy plugins

The xcaddy command will use the latest version of Caddy by default. You can customize this for all invocations by setting the CADDY_VERSION environment variable.

As usual with go command, the xcaddy command will pass the GOOS, GOARCH, and GOARM environment variables through for cross-compilation.

Custom builds

Syntax:

$ xcaddy build [<caddy_version>]
    [--output <file>]
    [--with <module[@version][=replacement]>...]

• <caddy_version> is the core Caddy version to build; defaults to CADDY_VERSION env variable or latest.
• --output changes the output file.
• --with can be used multiple times to add plugins by specifying the Go module name and optionally its version, similar to go get. Module name is required, but specific version and/or local replacement are optional.

Examples:

$ xcaddy build \
    --with github.com/caddyserver/ntlm-transport

$ xcaddy build v2.0.1 \
    --with github.com/caddyserver/ntlm-transport@v0.1.1

$ xcaddy build \
    --with github.com/caddyserver/ntlm-transport=../../my-fork

$ xcaddy build \
    --with github.com/caddyserver/ntlm-transport@v0.1.1=../../my-fork

For plugin development

If you run xcaddy from within the folder of the Caddy plugin you're working on without the build subcommand, it will build Caddy with your current module and run it, as if you manually plugged it in and invoked go run.

The binary will be built and run from the current directory, then cleaned up.

The current working directory must be inside an initialized Go module.

Syntax:

$ xcaddy <args...>

• <args...> are passed through to the caddy command.

For example:

$ xcaddy list-modules
$ xcaddy run
$ xcaddy run --config caddy.json

The race detector can be enabled by setting XCADDY_RACE_DETECTOR=1.

Library usage

builder := xcaddy.Builder{
	CaddyVersion: "v2.0.0",
	Plugins: []xcaddy.Dependency{
		{
			ModulePath: "github.com/caddyserver/ntlm-transport",
			Version:    "v0.1.1",
		},
	},
}
err := builder.Build(context.Background(), "./caddy")

Versions can be anything compatible with go get.

---

© 2020 Matthew Holt

Documentation

Index

• type Builder
  • func (b Builder) Build(ctx context.Context, outputFile string) error
• type Compile
  • func SupportedPlatforms() ([]Compile, error)
  • func (c Compile) CgoEnabled() string
• type Dependency
• type Platform
• type Replace

Types

type Builder

type Builder struct {
	Compile
	CaddyVersion string        `json:"caddy_version,omitempty"`
	Plugins      []Dependency  `json:"plugins,omitempty"`
	Replacements []Replace     `json:"replacements,omitempty"`
	TimeoutGet   time.Duration `json:"timeout_get,omitempty"`
	TimeoutBuild time.Duration `json:"timeout_build,omitempty"`
	RaceDetector bool          `json:"race_detector,omitempty"`
	SkipCleanup  bool          `json:"skip_cleanup,omitempty"`
}

Builder can produce a custom Caddy build with the configuration it represents.

func (Builder) Build

func (b Builder) Build(ctx context.Context, outputFile string) error

Build builds Caddy at the configured version with the configured plugins and plops down a binary at outputFile.

type Compile

type Compile struct {
	Platform
	Cgo bool `json:"cgo,omitempty"`
}

Compile contains parameters for compilation.

func SupportedPlatforms

func SupportedPlatforms() ([]Compile, error)

SupportedPlatforms runs `go tool dist list` to make a list of possible build targets.

func (Compile) CgoEnabled

func (c Compile) CgoEnabled() string

CgoEnabled returns "1" if c.Cgo is true, "0" otherwise. This is used for setting the CGO_ENABLED env variable.

type Dependency

type Dependency struct {
	// The name (path) of the Go module. If at a version > 1, it
	// should contain semantic import version suffix (i.e. "/v2").
	// Used with `go get`
	ModulePath string `json:"module_path,omitempty"`

	// The version of the Go module, like used with `go get`.
	Version string `json:"version,omitempty"`
}

Dependency pairs a Go module path with a version.

type Platform

type Platform struct {
	OS   string `json:"os,omitempty"`
	Arch string `json:"arch,omitempty"`
	ARM  string `json:"arm,omitempty"`
}

Platform represents a build target.

type Replace

type Replace struct {
	// The import path of the module being replaced.
	Old string `json:"old,omitempty"`

	// The path to the replacement module.
	New string `json:"new,omitempty"`
}

Replace represents a Go module replacement.