migrate

README

go-migrate

This is a very simple migration framework. See "Migrations" in https://github.com/jbenet/random-ideas/issues/33

This package includes:

• migrate package -- lib to write migration programs

The model

The idea here is that we have some thing -- usually a directory -- that needs to be migrated between different representation versions. This may be because there has been an upgrade.

Documentation

Overview

Package migrate is used to write migrations between representations of things.

Index

• Variables
• func Main(m Migration)
• func Run(m Migration) error
• func SplitVersion(s string) (from int, to int)
• type Flags
  • func (f *Flags) Parse()
  • func (f *Flags) Setup()
• type Migration
• type Options

Variables

var SupportNoRevert = map[string]bool{
	"4-to-5": true,
}

Functions

func Main

func Main(m Migration)

func Run

func Run(m Migration) error

func SplitVersion

func SplitVersion(s string) (from int, to int)

Types

type Flags

type Flags struct {
	Force    bool
	Revert   bool
	Path     string // file path to migrate for fs based migrations
	Verbose  bool
	Help     bool
	NoRevert bool
}

func (*Flags) Parse

func (f *Flags) Parse()

func (*Flags) Setup

func (f *Flags) Setup()

type Migration

type Migration interface {

	// Versions is the "v-to-v" version string.
	Versions() string

	// Reversible returns whether this migration can be reverted.
	// Endeavor to make them all reversible. This is here only to warn users
	// in case this is not the case.
	Reversible() bool

	// Apply applies the migration in question.
	Apply(Options) error

	// Revert un-applies the migration in question. This should be best-effort.
	// Some migrations are definitively one-way. If so, return an error.
	Revert(Options) error
}

Migration represents

type Options

type Options struct {
	Flags
	Verbose bool
}

Options are migration options. For now all flags are options.