CombinedOutput runs a command and returns the output string of c.CombinedOutput.

Dir returns a command that runs in the given dir.

MakeWorkDir creates a unique path inside the given root dir to use as a workspace.

Run sets up the command to log directly to our stdout/stderr streams, then runs it.

RunQuiet logs the command line and runs the given command, but sends the output to os.DevNull.

SpaceTrimmedCombinedOutput runs CombinedOutput and trims leading/trailing spaces from the result.