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moby--moby/builder/support.go

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package builder
import (
"regexp"
"strings"
)
var (
TOKEN_ENV_INTERPOLATION = regexp.MustCompile("(\\\\\\\\+|[^\\\\]|\\b|\\A)\\$({?)([[:alnum:]_]+)(}?)")
)
// handle environment replacement. Used in dispatcher.
func (b *Builder) replaceEnv(str string) string {
for _, match := range TOKEN_ENV_INTERPOLATION.FindAllString(str, -1) {
match = match[strings.Index(match, "$"):]
matchKey := strings.Trim(match, "${}")
for _, keyval := range b.Config.Env {
tmp := strings.SplitN(keyval, "=", 2)
if tmp[0] == matchKey {
str = strings.Replace(str, match, tmp[1], -1)
break
}
}
}
return str
}
func handleJsonArgs(args []string, attributes map[string]bool) []string {
if attributes != nil && attributes["json"] {
return args
}
// literal string command, not an exec array
return append([]string{"/bin/sh", "-c", strings.Join(args, " ")})
}