config: add init.defaultBranch to the config

config/config.go

@@ -89,6 +89,13 @@ type Config struct {
 		Window uint
 	}
 
+	Init struct {
+		// DefaultBranch Allows overriding the default branch name
+		// e.g. when initializing a new repository or when cloning
+		// an empty repository.
+		DefaultBranch string
+	}
+
 	// Remotes list of repository remotes, the key of the map is the name
 	// of the remote, should equal to RemoteConfig.Name.
 	Remotes map[string]*RemoteConfig
@@ -223,6 +230,7 @@ const (
 	userSection      = "user"
 	authorSection    = "author"
 	committerSection = "committer"
+	initSection      = "init"
 	fetchKey         = "fetch"
 	urlKey           = "url"
 	bareKey          = "bare"
@@ -233,6 +241,7 @@ const (
 	rebaseKey        = "rebase"
 	nameKey          = "name"
 	emailKey         = "email"
+	defaultBranchKey = "defaultBranch"
 
 	// DefaultPackWindow holds the number of previous objects used to
 	// generate deltas. The value 10 is the same used by git command.
@@ -251,6 +260,7 @@ func (c *Config) Unmarshal(b []byte) error {
 
 	c.unmarshalCore()
 	c.unmarshalUser()
+	c.unmarshalInit()
 	if err := c.unmarshalPack(); err != nil {
 		return err
 	}
@@ -344,6 +354,11 @@ func (c *Config) unmarshalBranches() error {
 	return nil
 }
 
+func (c *Config) unmarshalInit() {
+	s := c.Raw.Section(initSection)
+	c.Init.DefaultBranch = s.Options.Get(defaultBranchKey)
+}
+
 // Marshal returns Config encoded as a git-config file.
 func (c *Config) Marshal() ([]byte, error) {
 	c.marshalCore()
@@ -352,6 +367,7 @@ func (c *Config) Marshal() ([]byte, error) {
 	c.marshalRemotes()
 	c.marshalSubmodules()
 	c.marshalBranches()
+	c.marshalInit()
 
 	buf := bytes.NewBuffer(nil)
 	if err := format.NewEncoder(buf).Encode(c.Raw); err != nil {
@@ -475,6 +491,13 @@ func (c *Config) marshalBranches() {
 	s.Subsections = newSubsections
 }
 
+func (c *Config) marshalInit() {
+	s := c.Raw.Section(initSection)
+	if c.Init.DefaultBranch != "" {
+		s.SetOption(defaultBranchKey, c.Init.DefaultBranch)
+	}
+}
+
 // RemoteConfig contains the configuration for a given remote repository.
 type RemoteConfig struct {
 	// Name of the remote

config/config_test.go

@@ -4,6 +4,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"strings"
 
 	"github.com/go-git/go-git/v5/plumbing"
 	. "gopkg.in/check.v1"
@@ -46,6 +47,8 @@ func (s *ConfigSuite) TestUnmarshal(c *C) {
 [branch "master"]
 		remote = origin
 		merge = refs/heads/master
+[init]
+		defaultBranch = main
 `)
 
 	cfg := NewConfig()
@@ -77,6 +80,7 @@ func (s *ConfigSuite) TestUnmarshal(c *C) {
 	c.Assert(cfg.Submodules["qux"].Branch, Equals, "bar")
 	c.Assert(cfg.Branches["master"].Remote, Equals, "origin")
 	c.Assert(cfg.Branches["master"].Merge, Equals, plumbing.ReferenceName("refs/heads/master"))
+	c.Assert(cfg.Init.DefaultBranch, Equals, "main")
 }
 
 func (s *ConfigSuite) TestMarshal(c *C) {
@@ -99,12 +103,15 @@ func (s *ConfigSuite) TestMarshal(c *C) {
 [branch "master"]
 	remote = origin
 	merge = refs/heads/master
+[init]
+	defaultBranch = main
 `)
 
 	cfg := NewConfig()
 	cfg.Core.IsBare = true
 	cfg.Core.Worktree = "bar"
 	cfg.Pack.Window = 20
+	cfg.Init.DefaultBranch = "main"
 	cfg.Remotes["origin"] = &RemoteConfig{
 		Name: "origin",
 		URLs: []string{"git@github.com:mcuadros/go-git.git"},
@@ -315,3 +322,29 @@ func (s *ConfigSuite) TestRemoteConfigDefaultValues(c *C) {
 	c.Assert(config.Raw, NotNil)
 	c.Assert(config.Pack.Window, Equals, DefaultPackWindow)
 }
+
+func (s *ConfigSuite) TestLoadConfigLocalScope(c *C) {
+	cfg, err := LoadConfig(LocalScope)
+	c.Assert(err, NotNil)
+	c.Assert(cfg, IsNil)
+}
+
+func (s *ConfigSuite) TestRemoveUrlOptions(c *C) {
+	buf := []byte(`
+[remote "alt"]
+	url = git@github.com:mcuadros/go-git.git
+	url = git@github.com:src-d/go-git.git
+	fetch = +refs/heads/*:refs/remotes/origin/*
+	fetch = +refs/pull/*:refs/remotes/origin/pull/*`)
+
+	cfg := NewConfig()
+	err := cfg.Unmarshal(buf)
+	c.Assert(err, IsNil)
+	c.Assert(len(cfg.Remotes), Equals, 1)
+	cfg.Remotes["alt"].URLs = []string{}
+
+	buf, err = cfg.Marshal()
+	if strings.Contains(string(buf), "url") {
+		c.Fatal("conifg should not contain any url sections")
+	}
+}