allow pull --rebase on branch yet to be born
When doing a "pull --rebase", we check to make sure that the index and working tree are clean. The index-clean check compares the index against HEAD. The test erroneously reports dirtiness if we don't have a HEAD yet. In such an "unborn branch" case, by definition, a non-empty index won't be based on whatever we are pulling down from the remote, and will lose the local change. Just check if $GIT_DIR/index exists and error out. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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