describe: when failing, tell the user about options that work
Users seem to call git-describe without reading the manpage, and then wonder why it doesn't work with unannotated tags by default. Make a minimal effort towards seeing if there would have been unannotated tags, and tell the user. Specifically, we say that --tags could work if we found any unannotated tags. If not, we say that --always would have given results. Signed-off-by: NThomas Rast <trast@student.ethz.ch> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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