зеркало из https://github.com/microsoft/docker.git
59 строки
1.5 KiB
Go
59 строки
1.5 KiB
Go
package builder
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import (
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"regexp"
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"strings"
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)
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var (
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// `\\\\+|[^\\]|\b|\A` - match any number of "\\" (ie, properly-escaped backslashes), or a single non-backslash character, or a word boundary, or beginning-of-line
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// `\$` - match literal $
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// `[[:alnum:]_]+` - match things like `$SOME_VAR`
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// `{[[:alnum:]_]+}` - match things like `${SOME_VAR}`
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tokenEnvInterpolation = regexp.MustCompile(`(\\|\\\\+|[^\\]|\b|\A)\$([[:alnum:]_]+|{[[:alnum:]_]+})`)
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// this intentionally punts on more exotic interpolations like ${SOME_VAR%suffix} and lets the shell handle those directly
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)
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// handle environment replacement. Used in dispatcher.
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func (b *Builder) replaceEnv(str string) string {
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for _, match := range tokenEnvInterpolation.FindAllString(str, -1) {
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idx := strings.Index(match, "\\$")
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if idx != -1 {
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if idx+2 >= len(match) {
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str = strings.Replace(str, match, "\\$", -1)
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continue
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}
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stripped := match[idx+2:]
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str = strings.Replace(str, match, "$"+stripped, -1)
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continue
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}
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match = match[strings.Index(match, "$"):]
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matchKey := strings.Trim(match, "${}")
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for _, keyval := range b.Config.Env {
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tmp := strings.SplitN(keyval, "=", 2)
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if tmp[0] == matchKey {
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str = strings.Replace(str, match, tmp[1], -1)
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break
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}
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}
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}
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return str
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}
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func handleJsonArgs(args []string, attributes map[string]bool) []string {
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if len(args) == 0 {
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return []string{}
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}
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if attributes != nil && attributes["json"] {
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return args
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}
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// literal string command, not an exec array
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return []string{strings.Join(args, " ")}
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}
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