Enable use of DisableStdioBuffer

Previously, DisableStdioBuffer was added in #16, however was not consumed or used, as reported in #19. DisableStdioBuffer can now be set, if you only want to stream directly to stdio, or want to capture the output to your own writer without buffering. Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Author: alexellis

exec.go

@@ -151,9 +151,10 @@ func (et ExecTask) Execute(ctx context.Context) (ExecResult, error) {
 var stdoutWriters []io.Writer
 var stderrWriters []io.Writer
 
-// Always capture to a buffer
-stdoutWriters = append(stdoutWriters, &stdoutBuff)
-stderrWriters = append(stderrWriters, &stderrBuff)
+if !et.DisableStdioBuffer {
+stdoutWriters = append(stdoutWriters, &stdoutBuff)
+stderrWriters = append(stderrWriters, &stderrBuff)
+}
 
 if et.StreamStdio {
 stdoutWriters = append(stdoutWriters, os.Stdout)