I recall having an issue with git 1.4 in which git log did not produce correct chronology, and rpm would reject ChangeLogs generated from git log because they were out of order. I cannot duplicate that problem with modern git, but I notice in the mailing list archive some concern about gitlog-to-changelog supporting older forms of git. Is this of any concern? The problem is easy to resolve by using git rev-list to generate commits in the correct order.
-- William Pursell