49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
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package opts
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import (
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"fmt"
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"os"
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"runtime"
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"strings"
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"github.com/pkg/errors"
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)
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// ValidateEnv validates an environment variable and returns it.
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// If no value is specified, it returns the current value using os.Getenv.
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//
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// As on ParseEnvFile and related to #16585, environment variable names
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// are not validate what so ever, it's up to application inside docker
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// to validate them or not.
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//
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// The only validation here is to check if name is empty, per #25099
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func ValidateEnv(val string) (string, error) {
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arr := strings.Split(val, "=")
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if arr[0] == "" {
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return "", errors.Errorf("invalid environment variable: %s", val)
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}
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if len(arr) > 1 {
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return val, nil
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}
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if !doesEnvExist(val) {
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return val, nil
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}
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return fmt.Sprintf("%s=%s", val, os.Getenv(val)), nil
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}
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func doesEnvExist(name string) bool {
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for _, entry := range os.Environ() {
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parts := strings.SplitN(entry, "=", 2)
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if runtime.GOOS == "windows" {
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// Environment variable are case-insensitive on Windows. PaTh, path and PATH are equivalent.
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if strings.EqualFold(parts[0], name) {
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return true
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}
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}
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if parts[0] == name {
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return true
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}
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}
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return false
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}
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