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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| package utils | ||
|
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||
| import ( | ||
| "os" | ||
| "strings" | ||
| ) | ||
|
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| // UnsetEnv unsets all envars having prefix and returns a function | ||
| // that restores the env. Any newly added envars having prefix are | ||
| // also unset by restore. It is idiomatic to use with a defer. | ||
| // | ||
| // defer UnsetEnv("ACME_")() | ||
| // | ||
| // Note that modifying the env may have unpredictable results when | ||
| // tests are run with t.Parallel. | ||
| // NOTE: This is quick n' dirty from memory; write some tests for | ||
| // this code. | ||
| func UnsetEnv(prefix string) (restore func()) { | ||
| before := map[string]string{} | ||
|
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| for _, e := range os.Environ() { | ||
| if !strings.HasPrefix(e, prefix) { | ||
| continue | ||
| } | ||
|
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| parts := strings.SplitN(e, "=", 2) | ||
| before[parts[0]] = parts[1] | ||
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| os.Unsetenv(parts[0]) | ||
| } | ||
|
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| return func() { | ||
| after := map[string]string{} | ||
|
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| for _, e := range os.Environ() { | ||
| if !strings.HasPrefix(e, prefix) { | ||
| continue | ||
| } | ||
|
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| parts := strings.SplitN(e, "=", 2) | ||
| after[parts[0]] = parts[1] | ||
|
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| // Check if the envar previously existed | ||
| v, ok := before[parts[0]] | ||
| if !ok { | ||
| // This is a newly added envar with prefix, zap it | ||
| os.Unsetenv(parts[0]) | ||
| continue | ||
| } | ||
|
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| if parts[1] != v { | ||
| // If the envar value has changed, set it back | ||
| os.Setenv(parts[0], v) | ||
| } | ||
| } | ||
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| // Still need to check if there have been any deleted envars | ||
| for k, v := range before { | ||
| if _, ok := after[k]; !ok { | ||
| // k is not present in after, so we set it. | ||
| os.Setenv(k, v) | ||
| } | ||
| } | ||
| } | ||
| } |