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package opts // import "github.com/docker/docker/opts"
import (
"os"
"strings"
"github.com/pkg/errors"
)
// ValidateEnv validates an environment variable and returns it.
// If no value is specified, it obtains its value from the current environment
//
// As on ParseEnvFile and related to #16585, environment variable names
// are not validate whatsoever, it's up to application inside docker
// to validate them or not.
//
// The only validation here is to check if name is empty, per #25099
func ValidateEnv(val string) (string, error) {
k, _, ok := strings.Cut(val, "=")
if k == "" {
return "", errors.New("invalid environment variable: " + val)
}
if ok {
return val, nil
}
if envVal, ok := os.LookupEnv(k); ok {
return k + "=" + envVal, nil
}
return val, nil
}
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