0b95ff72cb
A few error handlings are missing because we ignore the subprocess exit code, for example "docker build" errors are currently ignored. Introduce _do_check() aside the existing _do() method and use it in a few places. Signed-off-by: Fam Zheng <famz@redhat.com> Message-Id: <20170712075528.22770-3-famz@redhat.com> Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Fam Zheng <famz@redhat.com>