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vendor: update buildkit v0.14-dev version 549891b

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Brings in formatter for lint requests.

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
This commit is contained in:
Tonis Tiigi
2024-04-11 07:49:31 -07:00
parent 3e90cc4b84
commit da3435ed3a
107 changed files with 6830 additions and 2446 deletions
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238
vendor/github.com/moby/buildkit/frontend/dockerfile/shell/envVarTest generated vendored Normal file
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@ -0,0 +1,238 @@
A|hello | hello
A|he'll'o | hello
A|he'llo | error
A|he\'llo | he'llo
A|he\\'llo | error
A|abc\tdef | abctdef
A|"abc\tdef" | abc\tdef
A|"abc\\tdef" | abc\tdef
A|'abc\tdef' | abc\tdef
A|hello\ | hello
A|hello\\ | hello\
A|"hello | error
A|"hello\" | error
A|"hel'lo" | hel'lo
A|'hello | error
A|'hello\' | hello\
A|'hello\there' | hello\there
A|'hello\\there' | hello\\there
A|"''" | ''
A|$. | $.
A|he$1x | hex
A|he$.x | he$.x
# Next one is different on Windows as $pwd==$PWD
U|he$pwd. | he.
W|he$pwd. | he/home.
A|he$PWD | he/home
A|he\$PWD | he$PWD
A|he\\$PWD | he\/home
A|"he\$PWD" | he$PWD
A|"he\\$PWD" | he\/home
A|\${} | ${}
A|\${}aaa | ${}aaa
A|he\${} | he${}
A|he\${}xx | he${}xx
A|${} | error
A|${}aaa | error
A|he${} | error
A|he${}xx | error
A|he${hi} | he
A|he${hi}xx | hexx
A|he${PWD} | he/home
A|he${.} | error
A|he${XXX:-000}xx | he000xx
A|he${PWD:-000}xx | he/homexx
A|he${XXX:-$PWD}xx | he/homexx
A|he${XXX:-${PWD:-yyy}}xx | he/homexx
A|he${XXX:-${YYY:-yyy}}xx | heyyyxx
A|he${XXX:YYY} | error
A|he${XXX?} | error
A|he${XXX:?} | error
A|he${PWD?} | he/home
A|he${PWD:?} | he/home
A|he${NULL?} | he
A|he${NULL:?} | error
A|he${XXX:+${PWD}}xx | hexx
A|he${PWD:+${XXX}}xx | hexx
A|he${PWD:+${SHELL}}xx | hebashxx
A|he${XXX:+000}xx | hexx
A|he${PWD:+000}xx | he000xx
A|'he${XX}' | he${XX}
A|"he${PWD}" | he/home
A|"he'$PWD'" | he'/home'
A|"$PWD" | /home
A|'$PWD' | $PWD
A|'\$PWD' | \$PWD
A|'"hello"' | "hello"
A|he\$PWD | he$PWD
A|"he\$PWD" | he$PWD
A|'he\$PWD' | he\$PWD
A|he${PWD | error
A|he${PWD:=000}xx | error
A|he${PWD:+${PWD}:}xx | he/home:xx
A|he${XXX:-\$PWD:}xx | he$PWD:xx
A|he${XXX:-\${PWD}z}xx | he${PWDz}xx
A|안녕하세요 | 안녕하세요
A|안'녕'하세요 | 안녕하세요
A|안'녕하세요 | error
A|안녕\'하세요 | 안녕'하세요
A|안\\'녕하세요 | error
A|안녕\t하세요 | 안녕t하세요
A|"안녕\t하세요" | 안녕\t하세요
A|'안녕\t하세요 | error
A|안녕하세요\ | 안녕하세요
A|안녕하세요\\ | 안녕하세요\
A|"안녕하세요 | error
A|"안녕하세요\" | error
A|"안녕'하세요" | 안녕'하세요
A|'안녕하세요 | error
A|'안녕하세요\' | 안녕하세요\
A|안녕$1x | 안녕x
A|안녕$.x | 안녕$.x
# Next one is different on Windows as $pwd==$PWD
U|안녕$pwd. | 안녕.
W|안녕$pwd. | 안녕/home.
A|안녕$PWD | 안녕/home
A|안녕\$PWD | 안녕$PWD
A|안녕\\$PWD | 안녕\/home
A|안녕\${} | 안녕${}
A|안녕\${}xx | 안녕${}xx
A|안녕${} | error
A|안녕${}xx | error
A|안녕${hi} | 안녕
A|안녕${hi}xx | 안녕xx
A|안녕${PWD} | 안녕/home
A|안녕${.} | error
A|안녕${XXX:-000}xx | 안녕000xx
A|안녕${PWD:-000}xx | 안녕/homexx
A|안녕${XXX:-$PWD}xx | 안녕/homexx
A|안녕${XXX:-${PWD:-yyy}}xx | 안녕/homexx
A|안녕${XXX:-${YYY:-yyy}}xx | 안녕yyyxx
A|안녕${XXX:YYY} | error
A|안녕${XXX:+${PWD}}xx | 안녕xx
A|안녕${PWD:+${XXX}}xx | 안녕xx
A|안녕${PWD:+${SHELL}}xx | 안녕bashxx
A|안녕${XXX:+000}xx | 안녕xx
A|안녕${PWD:+000}xx | 안녕000xx
A|'안녕${XX}' | 안녕${XX}
A|"안녕${PWD}" | 안녕/home
A|"안녕'$PWD'" | 안녕'/home'
A|'"안녕"' | "안녕"
A|안녕\$PWD | 안녕$PWD
A|"안녕\$PWD" | 안녕$PWD
A|'안녕\$PWD' | 안녕\$PWD
A|안녕${PWD | error
A|안녕${PWD:=000}xx | error
A|안녕${PWD:+${PWD}:}xx | 안녕/home:xx
A|안녕${XXX:-\$PWD:}xx | 안녕$PWD:xx
A|안녕${XXX:-\${PWD}z}xx | 안녕${PWDz}xx
A|$KOREAN | 한국어
A|안녕$KOREAN | 안녕한국어
A|${{aaa} | error
A|${aaa}} | }
A|${aaa | error
A|${{aaa:-bbb} | error
A|${aaa:-bbb}} | bbb}
A|${aaa:-bbb | error
A|${aaa:-bbb} | bbb
A|${aaa:-${bbb:-ccc}} | ccc
A|${aaa:-bbb ${foo} | error
A|${aaa:-bbb {foo} | bbb {foo
A|${:} | error
A|${:-bbb} | error
A|${:+bbb} | error
# Positional parameters won't be set:
# http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_05_01
A|$1 |
A|${1} |
A|${1:+bbb} |
A|${1:-bbb} | bbb
A|$2 |
A|${2} |
A|${2:+bbb} |
A|${2:-bbb} | bbb
A|$3 |
A|${3} |
A|${3:+bbb} |
A|${3:-bbb} | bbb
A|$4 |
A|${4} |
A|${4:+bbb} |
A|${4:-bbb} | bbb
A|$5 |
A|${5} |
A|${5:+bbb} |
A|${5:-bbb} | bbb
A|$6 |
A|${6} |
A|${6:+bbb} |
A|${6:-bbb} | bbb
A|$7 |
A|${7} |
A|${7:+bbb} |
A|${7:-bbb} | bbb
A|$8 |
A|${8} |
A|${8:+bbb} |
A|${8:-bbb} | bbb
A|$9 |
A|${9} |
A|${9:+bbb} |
A|${9:-bbb} | bbb
A|$999 |
A|${999} |
A|${999:+bbb} |
A|${999:-bbb} | bbb
A|$999aaa | aaa
A|${999}aaa | aaa
A|${999:+bbb}aaa | aaa
A|${999:-bbb}aaa | bbbaaa
A|$001 |
A|${001} |
A|${001:+bbb} |
A|${001:-bbb} | bbb
A|$001aaa | aaa
A|${001}aaa | aaa
A|${001:+bbb}aaa | aaa
A|${001:-bbb}aaa | bbbaaa
# Special parameters won't be set in the Dockerfile:
# http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_05_02
A|$@ |
A|${@} |
A|${@:+bbb} |
A|${@:-bbb} | bbb
A|$@@@ | @@
A|$@aaa | aaa
A|${@}aaa | aaa
A|${@:+bbb}aaa | aaa
A|${@:-bbb}aaa | bbbaaa
A|$* |
A|${*} |
A|${*:+bbb} |
A|${*:-bbb} | bbb
A|$# |
A|${#} |
A|${#:+bbb} |
A|${#:-bbb} | bbb
A|$? |
A|${?} |
A|${?:+bbb} |
A|${?:-bbb} | bbb
A|$- |
A|${-} |
A|${-:+bbb} |
A|${-:-bbb} | bbb
A|$$ |
A|${$} |
A|${$:+bbb} |
A|${$:-bbb} | bbb
A|$! |
A|${!} |
A|${!:+bbb} |
A|${!:-bbb} | bbb
A|$0 |
A|${0} |
A|${0:+bbb} |
A|${0:-bbb} | bbb

11
vendor/github.com/moby/buildkit/frontend/dockerfile/shell/equal_env_unix.go generated vendored Normal file
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@ -0,0 +1,11 @@
//go:build !windows
// +build !windows
package shell
// EqualEnvKeys compare two strings and returns true if they are equal.
// On Unix this comparison is case-sensitive.
// On Windows this comparison is case-insensitive.
func EqualEnvKeys(from, to string) bool {
return from == to
}

10
vendor/github.com/moby/buildkit/frontend/dockerfile/shell/equal_env_windows.go generated vendored Normal file
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@ -0,0 +1,10 @@
package shell
import "strings"
// EqualEnvKeys compare two strings and returns true if they are equal.
// On Unix this comparison is case-sensitive.
// On Windows this comparison is case-insensitive.
func EqualEnvKeys(from, to string) bool {
return strings.EqualFold(from, to)
}

645
vendor/github.com/moby/buildkit/frontend/dockerfile/shell/lex.go generated vendored Normal file
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@ -0,0 +1,645 @@
package shell
import (
"bytes"
"fmt"
"regexp"
"strings"
"text/scanner"
"unicode"
"github.com/pkg/errors"
)
// Lex performs shell word splitting and variable expansion.
//
// Lex takes a string and an array of env variables and
// process all quotes (" and ') as well as $xxx and ${xxx} env variable
// tokens. Tries to mimic bash shell process.
// It doesn't support all flavors of ${xx:...} formats but new ones can
// be added by adding code to the "special ${} format processing" section
type Lex struct {
escapeToken rune
RawQuotes bool
RawEscapes bool
SkipProcessQuotes bool
SkipUnsetEnv bool
}
// NewLex creates a new Lex which uses escapeToken to escape quotes.
func NewLex(escapeToken rune) *Lex {
return &Lex{escapeToken: escapeToken}
}
// ProcessWord will use the 'env' list of environment variables,
// and replace any env var references in 'word'.
func (s *Lex) ProcessWord(word string, env []string) (string, error) {
word, _, err := s.process(word, BuildEnvs(env))
return word, err
}
// ProcessWords will use the 'env' list of environment variables,
// and replace any env var references in 'word' then it will also
// return a slice of strings which represents the 'word'
// split up based on spaces - taking into account quotes. Note that
// this splitting is done **after** the env var substitutions are done.
// Note, each one is trimmed to remove leading and trailing spaces (unless
// they are quoted", but ProcessWord retains spaces between words.
func (s *Lex) ProcessWords(word string, env []string) ([]string, error) {
_, words, err := s.process(word, BuildEnvs(env))
return words, err
}
// ProcessWordWithMap will use the 'env' list of environment variables,
// and replace any env var references in 'word'.
func (s *Lex) ProcessWordWithMap(word string, env map[string]string) (string, error) {
word, _, err := s.process(word, env)
return word, err
}
// ProcessWordWithMatches will use the 'env' list of environment variables,
// replace any env var references in 'word' and return the env that were used.
func (s *Lex) ProcessWordWithMatches(word string, env map[string]string) (string, map[string]struct{}, error) {
sw := s.init(word, env)
word, _, err := sw.process(word)
return word, sw.matches, err
}
func (s *Lex) ProcessWordsWithMap(word string, env map[string]string) ([]string, error) {
_, words, err := s.process(word, env)
return words, err
}
func (s *Lex) init(word string, env map[string]string) *shellWord {
sw := &shellWord{
envs: env,
escapeToken: s.escapeToken,
skipUnsetEnv: s.SkipUnsetEnv,
skipProcessQuotes: s.SkipProcessQuotes,
rawQuotes: s.RawQuotes,
rawEscapes: s.RawEscapes,
matches: make(map[string]struct{}),
}
sw.scanner.Init(strings.NewReader(word))
return sw
}
func (s *Lex) process(word string, env map[string]string) (string, []string, error) {
sw := s.init(word, env)
return sw.process(word)
}
type shellWord struct {
scanner scanner.Scanner
envs map[string]string
escapeToken rune
rawQuotes bool
rawEscapes bool
skipUnsetEnv bool
skipProcessQuotes bool
matches map[string]struct{}
}
func (sw *shellWord) process(source string) (string, []string, error) {
word, words, err := sw.processStopOn(scanner.EOF, sw.rawEscapes)
if err != nil {
err = errors.Wrapf(err, "failed to process %q", source)
}
return word, words, err
}
type wordsStruct struct {
word string
words []string
inWord bool
}
func (w *wordsStruct) addChar(ch rune) {
if unicode.IsSpace(ch) && w.inWord {
if len(w.word) != 0 {
w.words = append(w.words, w.word)
w.word = ""
w.inWord = false
}
} else if !unicode.IsSpace(ch) {
w.addRawChar(ch)
}
}
func (w *wordsStruct) addRawChar(ch rune) {
w.word += string(ch)
w.inWord = true
}
func (w *wordsStruct) addString(str string) {
for _, ch := range str {
w.addChar(ch)
}
}
func (w *wordsStruct) addRawString(str string) {
w.word += str
w.inWord = true
}
func (w *wordsStruct) getWords() []string {
if len(w.word) > 0 {
w.words = append(w.words, w.word)
// Just in case we're called again by mistake
w.word = ""
w.inWord = false
}
return w.words
}
// Process the word, starting at 'pos', and stop when we get to the
// end of the word or the 'stopChar' character
func (sw *shellWord) processStopOn(stopChar rune, rawEscapes bool) (string, []string, error) {
var result bytes.Buffer
var words wordsStruct
var charFuncMapping = map[rune]func() (string, error){
'$': sw.processDollar,
}
if !sw.skipProcessQuotes {
charFuncMapping['\''] = sw.processSingleQuote
charFuncMapping['"'] = sw.processDoubleQuote
}
// temporarily set sw.rawEscapes if needed
if rawEscapes != sw.rawEscapes {
sw.rawEscapes = rawEscapes
defer func() {
sw.rawEscapes = !rawEscapes
}()
}
for sw.scanner.Peek() != scanner.EOF {
ch := sw.scanner.Peek()
if stopChar != scanner.EOF && ch == stopChar {
sw.scanner.Next()
return result.String(), words.getWords(), nil
}
if fn, ok := charFuncMapping[ch]; ok {
// Call special processing func for certain chars
tmp, err := fn()
if err != nil {
return "", []string{}, err
}
result.WriteString(tmp)
if ch == rune('$') {
words.addString(tmp)
} else {
words.addRawString(tmp)
}
} else {
// Not special, just add it to the result
ch = sw.scanner.Next()
if ch == sw.escapeToken {
if sw.rawEscapes {
words.addRawChar(ch)
result.WriteRune(ch)
}
// '\' (default escape token, but ` allowed) escapes, except end of line
ch = sw.scanner.Next()
if ch == scanner.EOF {
break
}
words.addRawChar(ch)
} else {
words.addChar(ch)
}
result.WriteRune(ch)
}
}
if stopChar != scanner.EOF {
return "", []string{}, errors.Errorf("unexpected end of statement while looking for matching %s", string(stopChar))
}
return result.String(), words.getWords(), nil
}
func (sw *shellWord) processSingleQuote() (string, error) {
// All chars between single quotes are taken as-is
// Note, you can't escape '
//
// From the "sh" man page:
// Single Quotes
// Enclosing characters in single quotes preserves the literal meaning of
// all the characters (except single quotes, making it impossible to put
// single-quotes in a single-quoted string).
var result bytes.Buffer
ch := sw.scanner.Next()
if sw.rawQuotes {
result.WriteRune(ch)
}
for {
ch = sw.scanner.Next()
switch ch {
case scanner.EOF:
return "", errors.New("unexpected end of statement while looking for matching single-quote")
case '\'':
if sw.rawQuotes {
result.WriteRune(ch)
}
return result.String(), nil
}
result.WriteRune(ch)
}
}
func (sw *shellWord) processDoubleQuote() (string, error) {
// All chars up to the next " are taken as-is, even ', except any $ chars
// But you can escape " with a \ (or ` if escape token set accordingly)
//
// From the "sh" man page:
// Double Quotes
// Enclosing characters within double quotes preserves the literal meaning
// of all characters except dollarsign ($), backquote (`), and backslash
// (\). The backslash inside double quotes is historically weird, and
// serves to quote only the following characters:
// $ ` " \ <newline>.
// Otherwise it remains literal.
var result bytes.Buffer
ch := sw.scanner.Next()
if sw.rawQuotes {
result.WriteRune(ch)
}
for {
switch sw.scanner.Peek() {
case scanner.EOF:
return "", errors.New("unexpected end of statement while looking for matching double-quote")
case '"':
ch := sw.scanner.Next()
if sw.rawQuotes {
result.WriteRune(ch)
}
return result.String(), nil
case '$':
value, err := sw.processDollar()
if err != nil {
return "", err
}
result.WriteString(value)
default:
ch := sw.scanner.Next()
if ch == sw.escapeToken {
if sw.rawEscapes {
result.WriteRune(ch)
}
switch sw.scanner.Peek() {
case scanner.EOF:
// Ignore \ at end of word
continue
case '"', '$', sw.escapeToken:
// These chars can be escaped, all other \'s are left as-is
// Note: for now don't do anything special with ` chars.
// Not sure what to do with them anyway since we're not going
// to execute the text in there (not now anyway).
ch = sw.scanner.Next()
}
}
result.WriteRune(ch)
}
}
}
func (sw *shellWord) processDollar() (string, error) {
sw.scanner.Next()
// $xxx case
if sw.scanner.Peek() != '{' {
name := sw.processName()
if name == "" {
return "$", nil
}
value, found := sw.getEnv(name)
if !found && sw.skipUnsetEnv {
return "$" + name, nil
}
return value, nil
}
sw.scanner.Next()
switch sw.scanner.Peek() {
case scanner.EOF:
return "", errors.New("syntax error: missing '}'")
case '{', '}', ':':
// Invalid ${{xx}, ${:xx}, ${:}. ${} case
return "", errors.New("syntax error: bad substitution")
}
name := sw.processName()
ch := sw.scanner.Next()
chs := string(ch)
nullIsUnset := false
switch ch {
case '}':
// Normal ${xx} case
value, set := sw.getEnv(name)
if !set && sw.skipUnsetEnv {
return fmt.Sprintf("${%s}", name), nil
}
return value, nil
case ':':
nullIsUnset = true
ch = sw.scanner.Next()
chs += string(ch)
fallthrough
case '+', '-', '?', '#', '%':
rawEscapes := ch == '#' || ch == '%'
word, _, err := sw.processStopOn('}', rawEscapes)
if err != nil {
if sw.scanner.Peek() == scanner.EOF {
return "", errors.New("syntax error: missing '}'")
}
return "", err
}
// Grab the current value of the variable in question so we
// can use it to determine what to do based on the modifier
value, set := sw.getEnv(name)
if sw.skipUnsetEnv && !set {
return fmt.Sprintf("${%s%s%s}", name, chs, word), nil
}
switch ch {
case '-':
if !set || (nullIsUnset && value == "") {
return word, nil
}
return value, nil
case '+':
if !set || (nullIsUnset && value == "") {
return "", nil
}
return word, nil
case '?':
if !set {
message := "is not allowed to be unset"
if word != "" {
message = word
}
return "", errors.Errorf("%s: %s", name, message)
}
if nullIsUnset && value == "" {
message := "is not allowed to be empty"
if word != "" {
message = word
}
return "", errors.Errorf("%s: %s", name, message)
}
return value, nil
case '%', '#':
// %/# matches the shortest pattern expansion, %%/## the longest
greedy := false
if word[0] == byte(ch) {
greedy = true
word = word[1:]
}
if ch == '%' {
return trimSuffix(word, value, greedy)
}
return trimPrefix(word, value, greedy)
default:
return "", errors.Errorf("unsupported modifier (%s) in substitution", chs)
}
case '/':
replaceAll := sw.scanner.Peek() == '/'
if replaceAll {
sw.scanner.Next()
}
pattern, _, err := sw.processStopOn('/', true)
if err != nil {
if sw.scanner.Peek() == scanner.EOF {
return "", errors.New("syntax error: missing '/' in ${}")
}
return "", err
}
replacement, _, err := sw.processStopOn('}', true)
if err != nil {
if sw.scanner.Peek() == scanner.EOF {
return "", errors.New("syntax error: missing '}'")
}
return "", err
}
value, set := sw.getEnv(name)
if sw.skipUnsetEnv && !set {
return fmt.Sprintf("${%s/%s/%s}", name, pattern, replacement), nil
}
re, err := convertShellPatternToRegex(pattern, true, false)
if err != nil {
return "", errors.Errorf("invalid pattern (%s) in substitution: %s", pattern, err)
}
if replaceAll {
value = re.ReplaceAllString(value, replacement)
} else {
if idx := re.FindStringIndex(value); idx != nil {
value = value[0:idx[0]] + replacement + value[idx[1]:]
}
}
return value, nil
default:
return "", errors.Errorf("unsupported modifier (%s) in substitution", chs)
}
}
func (sw *shellWord) processName() string {
// Read in a name (alphanumeric or _)
// If it starts with a numeric then just return $#
var name bytes.Buffer
for sw.scanner.Peek() != scanner.EOF {
ch := sw.scanner.Peek()
if name.Len() == 0 && unicode.IsDigit(ch) {
for sw.scanner.Peek() != scanner.EOF && unicode.IsDigit(sw.scanner.Peek()) {
// Keep reading until the first non-digit character, or EOF
ch = sw.scanner.Next()
name.WriteRune(ch)
}
return name.String()
}
if name.Len() == 0 && isSpecialParam(ch) {
ch = sw.scanner.Next()
return string(ch)
}
if !unicode.IsLetter(ch) && !unicode.IsDigit(ch) && ch != '_' {
break
}
ch = sw.scanner.Next()
name.WriteRune(ch)
}
return name.String()
}
// isSpecialParam checks if the provided character is a special parameters,
// as defined in http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_05_02
func isSpecialParam(char rune) bool {
switch char {
case '@', '*', '#', '?', '-', '$', '!', '0':
// Special parameters
// http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_05_02
return true
}
return false
}
func (sw *shellWord) getEnv(name string) (string, bool) {
for key, value := range sw.envs {
if EqualEnvKeys(name, key) {
sw.matches[name] = struct{}{}
return value, true
}
}
return "", false
}
func BuildEnvs(env []string) map[string]string {
envs := map[string]string{}
for _, e := range env {
i := strings.Index(e, "=")
if i < 0 {
envs[e] = ""
} else {
k := e[:i]
v := e[i+1:]
// overwrite value if key already exists
envs[k] = v
}
}
return envs
}
// convertShellPatternToRegex converts a shell-like wildcard pattern
// (? is a single char, * either the shortest or longest (greedy) string)
// to an equivalent regular expression.
//
// Based on
// https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_13
// but without the bracket expressions (`[]`)
func convertShellPatternToRegex(pattern string, greedy bool, anchored bool) (*regexp.Regexp, error) {
var s scanner.Scanner
s.Init(strings.NewReader(pattern))
var out strings.Builder
out.Grow(len(pattern) + 4)
// match only at the beginning of the string
if anchored {
out.WriteByte('^')
}
// default: non-greedy wildcards
starPattern := ".*?"
if greedy {
starPattern = ".*"
}
for tok := s.Next(); tok != scanner.EOF; tok = s.Next() {
switch tok {
case '*':
out.WriteString(starPattern)
continue
case '?':
out.WriteByte('.')
continue
case '\\':
// } and / as part of ${} need to be escaped, but the escape isn't part
// of the pattern
if s.Peek() == '}' || s.Peek() == '/' {
continue
}
out.WriteRune('\\')
tok = s.Next()
if tok != '*' && tok != '?' && tok != '\\' {
return nil, errors.Errorf("invalid escape '\\%c'", tok)
}
// regex characters that need to be escaped
// escaping closing is optional, but done for consistency
case '[', ']', '{', '}', '.', '+', '(', ')', '|', '^', '$':
out.WriteByte('\\')
}
out.WriteRune(tok)
}
return regexp.Compile(out.String())
}
func trimPrefix(word, value string, greedy bool) (string, error) {
re, err := convertShellPatternToRegex(word, greedy, true)
if err != nil {
return "", errors.Errorf("invalid pattern (%s) in substitution: %s", word, err)
}
if idx := re.FindStringIndex(value); idx != nil {
value = value[idx[1]:]
}
return value, nil
}
// reverse without avoid reversing escapes, i.e. a\*c -> c\*a
func reversePattern(pattern string) string {
patternRunes := []rune(pattern)
out := make([]rune, len(patternRunes))
lastIdx := len(patternRunes) - 1
for i := 0; i <= lastIdx; {
tok := patternRunes[i]
outIdx := lastIdx - i
if tok == '\\' && i != lastIdx {
out[outIdx-1] = tok
// the pattern is taken from a ${var#pattern}, so the last
// character can't be an escape character
out[outIdx] = patternRunes[i+1]
i += 2
} else {
out[outIdx] = tok
i++
}
}
return string(out)
}
func reverseString(str string) string {
out := []rune(str)
outIdx := len(out) - 1
for i := 0; i < outIdx; i++ {
out[i], out[outIdx] = out[outIdx], out[i]
outIdx--
}
return string(out)
}
func trimSuffix(pattern, word string, greedy bool) (string, error) {
// regular expressions can't handle finding the shortest rightmost
// string so we reverse both search space and pattern to convert it
// to a leftmost search in both cases
pattern = reversePattern(pattern)
word = reverseString(word)
str, err := trimPrefix(pattern, word, greedy)
if err != nil {
return "", err
}
return reverseString(str), nil
}

30
vendor/github.com/moby/buildkit/frontend/dockerfile/shell/wordsTest generated vendored Normal file
View File

@ -0,0 +1,30 @@
hello | hello
hello${hi}bye | hellobye
ENV hi=hi
hello${hi}bye | hellohibye
ENV space=abc def
hello${space}bye | helloabc,defbye
hello"${space}"bye | helloabc defbye
hello "${space}"bye | hello,abc defbye
ENV leading= ab c
hello${leading}def | hello,ab,cdef
hello"${leading}" def | hello ab c,def
hello"${leading}" | hello ab c
hello${leading} | hello,ab,c
# next line MUST have 3 trailing spaces, don't erase them!
ENV trailing=ab c
hello${trailing} | helloab,c
hello${trailing}d | helloab,c,d
hello"${trailing}"d | helloab c d
# next line MUST have 3 trailing spaces, don't erase them!
hel"lo${trailing}" | helloab c
hello" there " | hello there
hello there | hello,there
hello\ there | hello there
hello" there | error
hello\" there | hello",there
hello"\\there" | hello\there
hello"\there" | hello\there
hello'\\there' | hello\\there
hello'\there' | hello\there
hello'$there' | hello$there