util

func AppendError ¶

func AppendError(errs []error, err error) []error

append(errs, err) if err != nil

func AppendField ¶

func AppendField(fields []string, flag, prefix string) []string

func EnsureExecutable ¶

func EnsureExecutable(p string) error

EnsureExecutable sets the executable file mode bits, for all users, to ensure that we can execute a file

func ExecError ¶

func ExecError(err error) string

ExecError returns a string format of err including stderr if the err is an ExitError, useful for errors from e.g. exec.Cmd.Output().

func ExtractField ¶

func ExtractField(fields []string, target string) ([]string, string, bool)

ExtractField("--a=this --b=that --c=other", "--b") returns [--a=this, --c=other"], "that"

func FlushMem ¶

func FlushMem()

FlushMem will try to reduce the memory usage of the container it is running in run this after a build

func Home ¶

func Home(parts ...string) string

Returns $HOME/part/part/part

func InsertPath ¶

func InsertPath(path string) error

export PATH=path:$PATH

func JoinURL ¶

func JoinURL(urlPath, path string) (string, error)

gs://foo and bar becomes gs://foo/bar

func JsonForDebug ¶

func JsonForDebug(o interface{}) string

JsonForDebug returns a json representation of the value, or a string representation of an error It is useful for an easy implementation of fmt.Stringer

func K8s ¶

func K8s(topdir string, parts ...string) string

Returns $GOPATH/src/k8s.io/...

func MigrateOptions ¶

func MigrateOptions(m []MigratedOption) error

Read value from ENV if --flag unset, optionally pushing to ENV

func PushEnv ¶

func PushEnv(env, value string) (func() error, error)

Push env=value and return a function that resets env

func Pushd ¶

func Pushd(dir string) (func() error, error)

Chdir() to dir and return a function to cd back to Getwd()

func SetFieldDefault ¶

func SetFieldDefault(fields []string, flag, val string) []string