system: Add "--" after "-c" for sh (BZ #28519)
Prevent sh from interpreting a user string as shell options if it starts with '-' or '+'. Since the version of /bin/sh used for testing system() is different from the full-fledged system /bin/sh add support to it for handling "--" after "-c". Add a testcase to ensure the expected behavior. Signed-off-by:Joe Simmons-Talbott <josimmon@redhat.com> Reviewed-by:
Adhemerval Zanella <adhemerval.zanella@linaro.org>
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