Update src-d/go-git to v4.13.0 (#7688)

* update gopkg.in/src-d/go-git.v4 v4.13.0

* mod tidy

* vendor

13 files changed, 66 insertions, 240 deletions

diff --git a/vendor/github.com/kevinburke/ssh_config/.gitignore b/vendor/github.com/kevinburke/ssh_config/.gitignore
index a6ef824c1f..e69de29bb2 100644
--- a/vendor/github.com/kevinburke/ssh_config/.gitignore
+++ b/vendor/github.com/kevinburke/ssh_config/.gitignore
@@ -1 +0,0 @@
-/bazel-*
diff --git a/vendor/github.com/kevinburke/ssh_config/.mailmap b/vendor/github.com/kevinburke/ssh_config/.mailmap
new file mode 100644
index 0000000000..253406b1cc
--- /dev/null
+++ b/vendor/github.com/kevinburke/ssh_config/.mailmap
@@ -0,0 +1 @@
+Kevin Burke <kevin@burke.dev> Kevin Burke <kev@inburke.com>
diff --git a/vendor/github.com/kevinburke/ssh_config/.travis.yml b/vendor/github.com/kevinburke/ssh_config/.travis.yml
index 8b5964dd52..4306f30f85 100644
--- a/vendor/github.com/kevinburke/ssh_config/.travis.yml
+++ b/vendor/github.com/kevinburke/ssh_config/.travis.yml
@@ -3,9 +3,8 @@ go_import_path: github.com/kevinburke/ssh_config
 language: go
 
 go:
-  - 1.9.x
-  - 1.10.x
   - 1.11.x
+  - 1.12.x
   - master
 
 before_script:
diff --git a/vendor/github.com/kevinburke/ssh_config/AUTHORS.txt b/vendor/github.com/kevinburke/ssh_config/AUTHORS.txt
index 51b98f897a..cd3379400d 100644
--- a/vendor/github.com/kevinburke/ssh_config/AUTHORS.txt
+++ b/vendor/github.com/kevinburke/ssh_config/AUTHORS.txt
@@ -1,4 +1,5 @@
 Eugene Terentev <eugene@terentev.net>
-Kevin Burke <kev@inburke.com>
+Kevin Burke <kevin@burke.dev>
+Mark Nevill <nev@improbable.io>
 Sergey Lukjanov <me@slukjanov.name>
 Wayne Ashley Berry <wayneashleyberry@gmail.com>
diff --git a/vendor/github.com/kevinburke/ssh_config/Makefile b/vendor/github.com/kevinburke/ssh_config/Makefile
index 90c3a28616..a1880d18e1 100644
--- a/vendor/github.com/kevinburke/ssh_config/Makefile
+++ b/vendor/github.com/kevinburke/ssh_config/Makefile
@@ -1,15 +1,13 @@
 BUMP_VERSION := $(GOPATH)/bin/bump_version
-MEGACHECK := $(GOPATH)/bin/megacheck
+STATICCHECK := $(GOPATH)/bin/staticcheck
 WRITE_MAILMAP := $(GOPATH)/bin/write_mailmap
 
-IGNORES := 'github.com/kevinburke/ssh_config/config.go:U1000 github.com/kevinburke/ssh_config/config.go:S1002 github.com/kevinburke/ssh_config/token.go:U1000'
+$(STATICCHECK):
+	go get honnef.co/go/tools/cmd/staticcheck
 
-$(MEGACHECK):
-	go get honnef.co/go/tools/cmd/megacheck
-
-lint: $(MEGACHECK)
+lint: $(STATICCHECK)
 	go vet ./...
-	$(MEGACHECK) --ignore=$(IGNORES) ./...
+	$(STATICCHECK)
 
 test: lint
 	@# the timeout helps guard against infinite recursion
diff --git a/vendor/github.com/kevinburke/ssh_config/config.go b/vendor/github.com/kevinburke/ssh_config/config.go
index f400cef9c5..136f0c35c6 100644
--- a/vendor/github.com/kevinburke/ssh_config/config.go
+++ b/vendor/github.com/kevinburke/ssh_config/config.go
@@ -34,6 +34,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"os"
 	osuser "os/user"
 	"path/filepath"
@@ -43,7 +44,9 @@ import (
 	"sync"
 )
 
-const version = "0.5"
+const version = "1.0"
+
+var _ = version
 
 type configFinder func() string
 
@@ -156,6 +159,7 @@ func (u *UserSettings) GetStrict(alias, key string) (string, error) {
 		}
 		var err error
 		u.userConfig, err = parseFile(filename)
+		//lint:ignore S1002 I prefer it this way
 		if err != nil && os.IsNotExist(err) == false {
 			u.onceErr = err
 			return
@@ -166,11 +170,13 @@ func (u *UserSettings) GetStrict(alias, key string) (string, error) {
 			filename = u.systemConfigFinder()
 		}
 		u.systemConfig, err = parseFile(filename)
+		//lint:ignore S1002 I prefer it this way
 		if err != nil && os.IsNotExist(err) == false {
 			u.onceErr = err
 			return
 		}
 	})
+	//lint:ignore S1002 I prefer it this way
 	if u.onceErr != nil && u.IgnoreErrors == false {
 		return "", u.onceErr
 	}
@@ -190,26 +196,29 @@ func parseFile(filename string) (*Config, error) {
 }
 
 func parseWithDepth(filename string, depth uint8) (*Config, error) {
-	f, err := os.Open(filename)
+	b, err := ioutil.ReadFile(filename)
 	if err != nil {
 		return nil, err
 	}
-	defer f.Close()
-	return decode(f, isSystem(filename), depth)
+	return decodeBytes(b, isSystem(filename), depth)
 }
 
 func isSystem(filename string) bool {
-	// TODO i'm not sure this is the best way to detect a system repo
+	// TODO: not sure this is the best way to detect a system repo
 	return strings.HasPrefix(filepath.Clean(filename), "/etc/ssh")
 }
 
 // Decode reads r into a Config, or returns an error if r could not be parsed as
 // an SSH config file.
 func Decode(r io.Reader) (*Config, error) {
-	return decode(r, false, 0)
+	b, err := ioutil.ReadAll(r)
+	if err != nil {
+		return nil, err
+	}
+	return decodeBytes(b, false, 0)
 }
 
-func decode(r io.Reader, system bool, depth uint8) (c *Config, err error) {
+func decodeBytes(b []byte, system bool, depth uint8) (c *Config, err error) {
 	defer func() {
 		if r := recover(); r != nil {
 			if _, ok := r.(runtime.Error); ok {
@@ -223,7 +232,7 @@ func decode(r io.Reader, system bool, depth uint8) (c *Config, err error) {
 		}
 	}()
 
-	c = parseSSH(lexSSH(r), system, depth)
+	c = parseSSH(lexSSH(b), system, depth)
 	return c, err
 }
 
@@ -367,7 +376,7 @@ type Host struct {
 	// EOLComment is the comment (if any) terminating the Host line.
 	EOLComment   string
 	hasEquals    bool
-	leadingSpace uint16 // TODO: handle spaces vs tabs here.
+	leadingSpace int // TODO: handle spaces vs tabs here.
 	// The file starts with an implicit "Host *" declaration.
 	implicit bool
 }
@@ -379,7 +388,7 @@ func (h *Host) Matches(alias string) bool {
 	found := false
 	for i := range h.Patterns {
 		if h.Patterns[i].regex.MatchString(alias) {
-			if h.Patterns[i].not == true {
+			if h.Patterns[i].not {
 				// Negated match. "A pattern entry may be negated by prefixing
 				// it with an exclamation mark (`!'). If a negated entry is
 				// matched, then the Host entry is ignored, regardless of
@@ -398,6 +407,7 @@ func (h *Host) Matches(alias string) bool {
 // present in the whitespace in the printed file.
 func (h *Host) String() string {
 	var buf bytes.Buffer
+	//lint:ignore S1002 I prefer to write it this way
 	if h.implicit == false {
 		buf.WriteString(strings.Repeat(" ", int(h.leadingSpace)))
 		buf.WriteString("Host")
@@ -438,7 +448,7 @@ type KV struct {
 	Value        string
 	Comment      string
 	hasEquals    bool
-	leadingSpace uint16 // Space before the key. TODO handle spaces vs tabs.
+	leadingSpace int // Space before the key. TODO handle spaces vs tabs.
 	position     Position
 }
 
@@ -467,7 +477,7 @@ func (k *KV) String() string {
 // Empty is a line in the config file that contains only whitespace or comments.
 type Empty struct {
 	Comment      string
-	leadingSpace uint16 // TODO handle spaces vs tabs.
+	leadingSpace int // TODO handle spaces vs tabs.
 	position     Position
 }
 
@@ -494,7 +504,6 @@ type Include struct {
 	// Comment is the contents of any comment at the end of the Include
 	// statement.
 	Comment string
-	parsed  bool
 	// an include directive can include several different files, and wildcards
 	directives []string
 
@@ -504,7 +513,7 @@ type Include struct {
 	matches []string
 	// actual filenames are listed here
 	files        map[string]*Config
-	leadingSpace uint16
+	leadingSpace int
 	position     Position
 	depth        uint8
 	hasEquals    bool
@@ -523,6 +532,7 @@ func removeDups(arr []string) []string {
 	result := make([]string, 0)
 
 	for v := range arr {
+		//lint:ignore S1002 I prefer it this way
 		if encountered[arr[v]] == false {
 			encountered[arr[v]] = true
 			result = append(result, arr[v])
@@ -544,7 +554,7 @@ func NewInclude(directives []string, hasEquals bool, pos Position, comment strin
 		directives:   directives,
 		files:        make(map[string]*Config),
 		position:     pos,
-		leadingSpace: uint16(pos.Col) - 1,
+		leadingSpace: pos.Col - 1,
 		depth:        depth,
 		hasEquals:    hasEquals,
 	}
diff --git a/vendor/github.com/kevinburke/ssh_config/lexer.go b/vendor/github.com/kevinburke/ssh_config/lexer.go
index b0c6a8650c..11680b4c74 100644
--- a/vendor/github.com/kevinburke/ssh_config/lexer.go
+++ b/vendor/github.com/kevinburke/ssh_config/lexer.go
@@ -1,22 +1,22 @@
 package ssh_config
 
 import (
-	"io"
-
-	buffruneio "github.com/pelletier/go-buffruneio"
+	"bytes"
 )
 
 // Define state functions
 type sshLexStateFn func() sshLexStateFn
 
 type sshLexer struct {
-	input         *buffruneio.Reader // Textual source
-	buffer        []rune             // Runes composing the current token
+	inputIdx int
+	input    []rune // Textual source
+
+	buffer        []rune // Runes composing the current token
 	tokens        chan token
-	line          uint32
-	col           uint16
-	endbufferLine uint32
-	endbufferCol  uint16
+	line          int
+	col           int
+	endbufferLine int
+	endbufferCol  int
 }
 
 func (s *sshLexer) lexComment(previousState sshLexStateFn) sshLexStateFn {
@@ -114,16 +114,14 @@ func (s *sshLexer) lexRvalue() sshLexStateFn {
 }
 
 func (s *sshLexer) read() rune {
-	r, _, err := s.input.ReadRune()
-	if err != nil {
-		panic(err)
-	}
+	r := s.peek()
 	if r == '\n' {
 		s.endbufferLine++
 		s.endbufferCol = 1
 	} else {
 		s.endbufferCol++
 	}
+	s.inputIdx++
 	return r
 }
 
@@ -197,21 +195,22 @@ func (s *sshLexer) emitWithValue(t tokenType, value string) {
 }
 
 func (s *sshLexer) peek() rune {
-	r, _, err := s.input.ReadRune()
-	if err != nil {
-		panic(err)
+	if s.inputIdx >= len(s.input) {
+		return eof
 	}
-	s.input.UnreadRune()
+
+	r := s.input[s.inputIdx]
 	return r
 }
 
 func (s *sshLexer) follow(next string) bool {
+	inputIdx := s.inputIdx
 	for _, expectedRune := range next {
-		r, _, err := s.input.ReadRune()
-		defer s.input.UnreadRune()
-		if err != nil {
-			panic(err)
+		if inputIdx >= len(s.input) {
+			return false
 		}
+		r := s.input[inputIdx]
+		inputIdx++
 		if expectedRune != r {
 			return false
 		}
@@ -226,10 +225,10 @@ func (s *sshLexer) run() {
 	close(s.tokens)
 }
 
-func lexSSH(input io.Reader) chan token {
-	bufferedInput := buffruneio.NewReader(input)
+func lexSSH(input []byte) chan token {
+	runes := bytes.Runes(input)
 	l := &sshLexer{
-		input:         bufferedInput,
+		input:         runes,
 		tokens:        make(chan token),
 		line:          1,
 		col:           1,
diff --git a/vendor/github.com/kevinburke/ssh_config/parser.go b/vendor/github.com/kevinburke/ssh_config/parser.go
index 02745b4b29..36c42055f5 100644
--- a/vendor/github.com/kevinburke/ssh_config/parser.go
+++ b/vendor/github.com/kevinburke/ssh_config/parser.go
@@ -149,7 +149,7 @@ func (p *sshParser) parseKV() sshParserStateFn {
 		Value:        val.val,
 		Comment:      comment,
 		hasEquals:    hasEquals,
-		leadingSpace: uint16(key.Position.Col) - 1,
+		leadingSpace: key.Position.Col - 1,
 		position:     key.Position,
 	}
 	lastHost.Nodes = append(lastHost.Nodes, kv)
@@ -169,6 +169,12 @@ func (p *sshParser) parseComment() sshParserStateFn {
 }
 
 func parseSSH(flow chan token, system bool, depth uint8) *Config {
+	// Ensure we consume tokens to completion even if parser exits early
+	defer func() {
+		for range flow {
+		}
+	}()
+
 	result := newConfig()
 	result.position = Position{1, 1}
 	parser := &sshParser{
diff --git a/vendor/github.com/kevinburke/ssh_config/position.go b/vendor/github.com/kevinburke/ssh_config/position.go
index 7304bc3b7f..e0b5e3fb33 100644
--- a/vendor/github.com/kevinburke/ssh_config/position.go
+++ b/vendor/github.com/kevinburke/ssh_config/position.go
@@ -8,8 +8,8 @@ import "fmt"
 // column number, respectively.  Values of zero or less will cause Invalid(),
 // to return true.
 type Position struct {
-	Line uint32 // line within the document
-	Col  uint16 // column within the line
+	Line int // line within the document
+	Col  int // column within the line
 }
 
 // String representation of the position.
diff --git a/vendor/github.com/pelletier/go-buffruneio/.gitignore b/vendor/github.com/pelletier/go-buffruneio/.gitignore
deleted file mode 100644
index c56069fe26..0000000000
--- a/vendor/github.com/pelletier/go-buffruneio/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-*.test
\ No newline at end of file
diff --git a/vendor/github.com/pelletier/go-buffruneio/.travis.yml b/vendor/github.com/pelletier/go-buffruneio/.travis.yml
deleted file mode 100644
index 9720442cd8..0000000000
--- a/vendor/github.com/pelletier/go-buffruneio/.travis.yml
+++ /dev/null
@@ -1,7 +0,0 @@
-language: go
-sudo: false
-go:
-    - 1.3.3
-    - 1.4.3
-    - 1.5.3
-    - tip
diff --git a/vendor/github.com/pelletier/go-buffruneio/README.md b/vendor/github.com/pelletier/go-buffruneio/README.md
deleted file mode 100644
index ff608b3ab8..0000000000
--- a/vendor/github.com/pelletier/go-buffruneio/README.md
+++ /dev/null
@@ -1,62 +0,0 @@
-# buffruneio
-
-[![Tests Status](https://travis-ci.org/pelletier/go-buffruneio.svg?branch=master)](https://travis-ci.org/pelletier/go-buffruneio)
-[![GoDoc](https://godoc.org/github.com/pelletier/go-buffruneio?status.svg)](https://godoc.org/github.com/pelletier/go-buffruneio)
-
-Buffruneio is a wrapper around bufio to provide buffered runes access with
-unlimited unreads.
-
-```go
-import "github.com/pelletier/go-buffruneio"
-```
-
-## Examples
-
-```go
-import (
-    "fmt"
-    "github.com/pelletier/go-buffruneio"
-    "strings"
-)
-
-reader := buffruneio.NewReader(strings.NewReader("abcd"))
-fmt.Println(reader.ReadRune()) // 'a'
-fmt.Println(reader.ReadRune()) // 'b'
-fmt.Println(reader.ReadRune()) // 'c'
-reader.UnreadRune()
-reader.UnreadRune()
-fmt.Println(reader.ReadRune()) // 'b'
-fmt.Println(reader.ReadRune()) // 'c'
-```
-
-## Documentation
-
-The documentation and additional examples are available at
-[godoc.org](http://godoc.org/github.com/pelletier/go-buffruneio).
-
-## Contribute
-
-Feel free to report bugs and patches using GitHub's pull requests system on
-[pelletier/go-toml](https://github.com/pelletier/go-buffruneio). Any feedback is
-much appreciated!
-
-## LICENSE
-
-Copyright (c) 2016 Thomas Pelletier
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of
-this software and associated documentation files (the "Software"), to deal in
-the Software without restriction, including without limitation the rights to
-use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
-the Software, and to permit persons to whom the Software is furnished to do so,
-subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
-COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
-IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/vendor/github.com/pelletier/go-buffruneio/buffruneio.go b/vendor/github.com/pelletier/go-buffruneio/buffruneio.go
deleted file mode 100644
index 4e6d6ea610..0000000000
--- a/vendor/github.com/pelletier/go-buffruneio/buffruneio.go
+++ /dev/null
@@ -1,117 +0,0 @@
-// Package buffruneio is a wrapper around bufio to provide buffered runes access with unlimited unreads.
-package buffruneio
-
-import (
-	"bufio"
-	"container/list"
-	"errors"
-	"io"
-)
-
-// Rune to indicate end of file.
-const (
-	EOF = -(iota + 1)
-)
-
-// ErrNoRuneToUnread is returned by UnreadRune() when the read index is already at the beginning of the buffer.
-var ErrNoRuneToUnread = errors.New("no rune to unwind")
-
-// Reader implements runes buffering for an io.Reader object.
-type Reader struct {
-	buffer  *list.List
-	current *list.Element
-	input   *bufio.Reader
-}
-
-// NewReader returns a new Reader.
-func NewReader(rd io.Reader) *Reader {
-	return &Reader{
-		buffer: list.New(),
-		input:  bufio.NewReader(rd),
-	}
-}
-
-type runeWithSize struct {
-	r    rune
-	size int
-}
-
-func (rd *Reader) feedBuffer() error {
-	r, size, err := rd.input.ReadRune()
-
-	if err != nil {
-		if err != io.EOF {
-			return err
-		}
-		r = EOF
-	}
-
-	newRuneWithSize := runeWithSize{r, size}
-
-	rd.buffer.PushBack(newRuneWithSize)
-	if rd.current == nil {
-		rd.current = rd.buffer.Back()
-	}
-	return nil
-}
-
-// ReadRune reads the next rune from buffer, or from the underlying reader if needed.
-func (rd *Reader) ReadRune() (rune, int, error) {
-	if rd.current == rd.buffer.Back() || rd.current == nil {
-		err := rd.feedBuffer()
-		if err != nil {
-			return EOF, 0, err
-		}
-	}
-
-	runeWithSize := rd.current.Value.(runeWithSize)
-	rd.current = rd.current.Next()
-	return runeWithSize.r, runeWithSize.size, nil
-}
-
-// UnreadRune pushes back the previously read rune in the buffer, extending it if needed.
-func (rd *Reader) UnreadRune() error {
-	if rd.current == rd.buffer.Front() {
-		return ErrNoRuneToUnread
-	}
-	if rd.current == nil {
-		rd.current = rd.buffer.Back()
-	} else {
-		rd.current = rd.current.Prev()
-	}
-	return nil
-}
-
-// Forget removes runes stored before the current stream position index.
-func (rd *Reader) Forget() {
-	if rd.current == nil {
-		rd.current = rd.buffer.Back()
-	}
-	for ; rd.current != rd.buffer.Front(); rd.buffer.Remove(rd.current.Prev()) {
-	}
-}
-
-// PeekRune returns at most the next n runes, reading from the uderlying source if
-// needed. Does not move the current index. It includes EOF if reached.
-func (rd *Reader) PeekRunes(n int) []rune {
-	res := make([]rune, 0, n)
-	cursor := rd.current
-	for i := 0; i < n; i++ {
-		if cursor == nil {
-			err := rd.feedBuffer()
-			if err != nil {
-				return res
-			}
-			cursor = rd.buffer.Back()
-		}
-		if cursor != nil {
-			r := cursor.Value.(runeWithSize).r
-			res = append(res, r)
-			if r == EOF {
-				return res
-			}
-			cursor = cursor.Next()
-		}
-	}
-	return res
-}