aboutsummaryrefslogtreecommitdiffstats
path: root/config/config.go
blob: b5132ac5f6023064018ec12d70a669ce1d29f30b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
// Package config contains the abstraction of multiple config files
package config

import (
	"bytes"
	"errors"
	"fmt"
	"sort"
	"strconv"

	format "gopkg.in/src-d/go-git.v4/plumbing/format/config"
)

const (
	// DefaultFetchRefSpec is the default refspec used for fetch.
	DefaultFetchRefSpec = "+refs/heads/*:refs/remotes/%s/*"
	// DefaultPushRefSpec is the default refspec used for push.
	DefaultPushRefSpec = "refs/heads/*:refs/heads/*"
)

// ConfigStorer generic storage of Config object
type ConfigStorer interface {
	Config() (*Config, error)
	SetConfig(*Config) error
}

var (
	ErrInvalid               = errors.New("config invalid remote")
	ErrRemoteConfigNotFound  = errors.New("remote config not found")
	ErrRemoteConfigEmptyURL  = errors.New("remote config: empty URL")
	ErrRemoteConfigEmptyName = errors.New("remote config: empty name")
)

// Config contains the repository configuration
// ftp://www.kernel.org/pub/software/scm/git/docs/git-config.html#FILES
type Config struct {
	Core struct {
		// IsBare if true this repository is assumed to be bare and has no
		// working directory associated with it.
		IsBare bool
		// Worktree is the path to the root of the working tree.
		Worktree string
	}

	Pack struct {
		// Window controls the size of the sliding window for delta
		// compression.  The default is 10.  A value of 0 turns off
		// delta compression entirely.
		Window uint
	}

	// 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
	// Submodules list of repository submodules, the key of the map is the name
	// of the submodule, should equal to Submodule.Name.
	Submodules map[string]*Submodule

	// Raw contains the raw information of a config file. The main goal is
	// preserve the parsed information from the original format, to avoid
	// dropping unsupported fields.
	Raw *format.Config
}

// NewConfig returns a new empty Config.
func NewConfig() *Config {
	config := &Config{
		Remotes:    make(map[string]*RemoteConfig),
		Submodules: make(map[string]*Submodule),
		Raw:        format.New(),
	}

	config.Pack.Window = defaultPackWindow

	return config
}

// Validate validates the fields and sets the default values.
func (c *Config) Validate() error {
	for name, r := range c.Remotes {
		if r.Name != name {
			return ErrInvalid
		}

		if err := r.Validate(); err != nil {
			return err
		}
	}

	return nil
}

const (
	remoteSection    = "remote"
	submoduleSection = "submodule"
	coreSection      = "core"
	packSection      = "pack"
	fetchKey         = "fetch"
	urlKey           = "url"
	bareKey          = "bare"
	worktreeKey      = "worktree"
	windowKey        = "window"

	defaultPackWindow = uint(10)
)

// Unmarshal parses a git-config file and stores it.
func (c *Config) Unmarshal(b []byte) error {
	r := bytes.NewBuffer(b)
	d := format.NewDecoder(r)

	c.Raw = format.New()
	if err := d.Decode(c.Raw); err != nil {
		return err
	}

	c.unmarshalCore()
	if err := c.unmarshalPack(); err != nil {
		return err
	}
	c.unmarshalSubmodules()
	return c.unmarshalRemotes()
}

func (c *Config) unmarshalCore() {
	s := c.Raw.Section(coreSection)
	if s.Options.Get(bareKey) == "true" {
		c.Core.IsBare = true
	}

	c.Core.Worktree = s.Options.Get(worktreeKey)
}

func (c *Config) unmarshalPack() error {
	s := c.Raw.Section(packSection)
	window := s.Options.Get(windowKey)
	if window == "" {
		c.Pack.Window = defaultPackWindow
	} else {
		winUint, err := strconv.ParseUint(window, 10, 32)
		if err != nil {
			return err
		}
		c.Pack.Window = uint(winUint)
	}
	return nil
}

func (c *Config) unmarshalRemotes() error {
	s := c.Raw.Section(remoteSection)
	for _, sub := range s.Subsections {
		r := &RemoteConfig{}
		if err := r.unmarshal(sub); err != nil {
			return err
		}

		c.Remotes[r.Name] = r
	}

	return nil
}

func (c *Config) unmarshalSubmodules() {
	s := c.Raw.Section(submoduleSection)
	for _, sub := range s.Subsections {
		m := &Submodule{}
		m.unmarshal(sub)

		c.Submodules[m.Name] = m
	}
}

// Marshal returns Config encoded as a git-config file.
func (c *Config) Marshal() ([]byte, error) {
	c.marshalCore()
	c.marshalPack()
	c.marshalRemotes()
	c.marshalSubmodules()

	buf := bytes.NewBuffer(nil)
	if err := format.NewEncoder(buf).Encode(c.Raw); err != nil {
		return nil, err
	}

	return buf.Bytes(), nil
}

func (c *Config) marshalCore() {
	s := c.Raw.Section(coreSection)
	s.SetOption(bareKey, fmt.Sprintf("%t", c.Core.IsBare))

	if c.Core.Worktree != "" {
		s.SetOption(worktreeKey, c.Core.Worktree)
	}
}

func (c *Config) marshalPack() {
	s := c.Raw.Section(packSection)
	if c.Pack.Window != defaultPackWindow {
		s.SetOption(windowKey, fmt.Sprintf("%d", c.Pack.Window))
	}
}

func (c *Config) marshalRemotes() {
	s := c.Raw.Section(remoteSection)
	newSubsections := make(format.Subsections, 0, len(c.Remotes))
	added := make(map[string]bool)
	for _, subsection := range s.Subsections {
		if remote, ok := c.Remotes[subsection.Name]; ok {
			newSubsections = append(newSubsections, remote.marshal())
			added[subsection.Name] = true
		}
	}

	remoteNames := make([]string, 0, len(c.Remotes))
	for name := range c.Remotes {
		remoteNames = append(remoteNames, name)
	}

	sort.Strings(remoteNames)

	for _, name := range remoteNames {
		if !added[name] {
			newSubsections = append(newSubsections, c.Remotes[name].marshal())
		}
	}

	s.Subsections = newSubsections
}

func (c *Config) marshalSubmodules() {
	s := c.Raw.Section(submoduleSection)
	s.Subsections = make(format.Subsections, len(c.Submodules))

	var i int
	for _, r := range c.Submodules {
		section := r.marshal()
		// the submodule section at config is a subset of the .gitmodule file
		// we should remove the non-valid options for the config file.
		section.RemoveOption(pathKey)
		s.Subsections[i] = section
		i++
	}
}

// RemoteConfig contains the configuration for a given remote repository.
type RemoteConfig struct {
	// Name of the remote
	Name string
	// URLs the URLs of a remote repository. It must be non-empty. Fetch will
	// always use the first URL, while push will use all of them.
	URLs []string
	// Fetch the default set of "refspec" for fetch operation
	Fetch []RefSpec

	// raw representation of the subsection, filled by marshal or unmarshal are
	// called
	raw *format.Subsection
}

// Validate validates the fields and sets the default values.
func (c *RemoteConfig) Validate() error {
	if c.Name == "" {
		return ErrRemoteConfigEmptyName
	}

	if len(c.URLs) == 0 {
		return ErrRemoteConfigEmptyURL
	}

	for _, r := range c.Fetch {
		if err := r.Validate(); err != nil {
			return err
		}
	}

	if len(c.Fetch) == 0 {
		c.Fetch = []RefSpec{RefSpec(fmt.Sprintf(DefaultFetchRefSpec, c.Name))}
	}

	return nil
}

func (c *RemoteConfig) unmarshal(s *format.Subsection) error {
	c.raw = s

	fetch := []RefSpec{}
	for _, f := range c.raw.Options.GetAll(fetchKey) {
		rs := RefSpec(f)
		if err := rs.Validate(); err != nil {
			return err
		}

		fetch = append(fetch, rs)
	}

	c.Name = c.raw.Name
	c.URLs = append([]string(nil), c.raw.Options.GetAll(urlKey)...)
	c.Fetch = fetch

	return nil
}

func (c *RemoteConfig) marshal() *format.Subsection {
	if c.raw == nil {
		c.raw = &format.Subsection{}
	}

	c.raw.Name = c.Name
	if len(c.URLs) == 0 {
		c.raw.RemoveOption(urlKey)
	} else {
		c.raw.SetOption(urlKey, c.URLs...)
	}

	if len(c.Fetch) == 0 {
		c.raw.RemoveOption(fetchKey)
	} else {
		var values []string
		for _, rs := range c.Fetch {
			values = append(values, rs.String())
		}

		c.raw.SetOption(fetchKey, values...)
	}

	return c.raw
}