43 lines
1 KiB
Go
43 lines
1 KiB
Go
package container
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import (
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"strings"
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)
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// ReplaceOrAppendEnvValues returns the defaults with the overrides either
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// replaced by env key or appended to the list
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func ReplaceOrAppendEnvValues(defaults, overrides []string) []string {
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cache := make(map[string]int, len(defaults))
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for i, e := range defaults {
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parts := strings.SplitN(e, "=", 2)
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cache[parts[0]] = i
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}
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for _, value := range overrides {
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// Values w/o = means they want this env to be removed/unset.
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if !strings.Contains(value, "=") {
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if i, exists := cache[value]; exists {
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defaults[i] = "" // Used to indicate it should be removed
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}
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continue
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}
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// Just do a normal set/update
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parts := strings.SplitN(value, "=", 2)
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if i, exists := cache[parts[0]]; exists {
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defaults[i] = value
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} else {
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defaults = append(defaults, value)
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}
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}
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// Now remove all entries that we want to "unset"
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for i := 0; i < len(defaults); i++ {
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if defaults[i] == "" {
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defaults = append(defaults[:i], defaults[i+1:]...)
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i--
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}
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}
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return defaults
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}
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