kubernetes/staging/src/k8s.io/kubectl/pkg/cmd/set/env/env_parse.go

var argumentEnvironment …

// IsEnvironmentArgument checks whether a string is an environment argument, that is, whether it matches the "anycharacters=anycharacters" pattern.
func IsEnvironmentArgument(s string) bool { … }

// SplitEnvironmentFromResources separates resources from environment arguments.
// Resources must come first. Arguments may have the "DASH-" syntax.
func SplitEnvironmentFromResources(args []string) (resources, envArgs []string, ok bool) { … }

// parseIntoEnvVar parses the list of key-value pairs into kubernetes EnvVar.
// envVarType is for making errors more specific to user intentions.
func parseIntoEnvVar(spec []string, defaultReader io.Reader, envVarType string) ([]v1.EnvVar, []string, bool, error) { … }

// ParseEnv parses the elements of the first argument looking for environment variables in key=value form and, if one of those values is "-", it also scans the reader and returns true for its third return value.
// The same environment variable cannot be both modified and removed in the same command.
func ParseEnv(spec []string, defaultReader io.Reader) ([]v1.EnvVar, []string, bool, error) { … }

func readEnv(r io.Reader, envVarType string) ([]v1.EnvVar, error) { … }