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package container // import "github.com/docker/docker/container"
import (
"strings"
)
// ReplaceOrAppendEnvValues returns the defaults with the overrides either
// replaced by env key or appended to the list
func ReplaceOrAppendEnvValues(defaults, overrides []string) []string {
cache := make(map[string]int, len(defaults))
for i, e := range defaults {
index := strings.Index(e, "=")
cache[e[:index]] = i
}
for _, value := range overrides {
// Values w/o = means they want this env to be removed/unset.
index := strings.Index(value, "=")
if index < 0 {
// no "=" in value
if i, exists := cache[value]; exists {
defaults[i] = "" // Used to indicate it should be removed
}
continue
}
if i, exists := cache[value[:index]]; exists {
defaults[i] = value
} else {
defaults = append(defaults, value)
}
}
// Now remove all entries that we want to "unset"
for i := 0; i < len(defaults); i++ {
if defaults[i] == "" {
defaults = append(defaults[:i], defaults[i+1:]...)
i--
}
}
return defaults
}
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