lock_ref_sha1_basic(): on SCLD_VANISHED, retry
If safe_create_leading_directories() fails because a file along the path unexpectedly vanished, try again (up to 3 times). This can occur if another process is deleting directories at the same time as we are trying to make them. For example, "git pack-refs --all" tries to delete the loose refs and any empty directories that are left behind. If a pack-refs process is running, then it might delete a directory that we need to put a new loose reference in. If safe_create_leading_directories() thinks this might have happened, then take its advice and try again (maximum three attempts). Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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