Make 'git submodule update --force' always check out submodules.
Currently, it will only do a checkout if the sha1 registered in the containing repository doesn't match the HEAD of the submodule, regardless of whether the submodule is dirty. As discussed on the mailing list, the '--force' flag is a strong indicator that the state of the submodule is suspect, and should be reset to HEAD. Signed-off-by: NStefan Zager <szager@google.com> Acked-by: NJens Lehmann <Jens.Lehmann@web.de> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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