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refs: propagate errno when reading special refs fails
Some refs in Git are more special than others due to reasons explained in the next commit. These refs are read via `refs_read_special_head()`, but this function doesn't behave the same as when we try to read a normal ref. Most importantly, we do not propagate `failure_errno` in the case where the reference does not exist, which is behaviour that we rely on in many parts of Git. Fix this bug by propagating errno when `strbuf_read_file()` fails. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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