Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx> writes: > t7814 has repo tree like this > > initial-repo > submodule > sub > > In each repo 'submodule' and 'sub', a commit is made to add the same > initial file 'a' with the same message 'add a'. If tests run fast > enough, the two commits are made in the same second, resulting > identical commits. > > There is nothing wrong with that per-se. But it could make the test > flaky. Currently all submodule odbs are merged back in the main > one (because we can't, or couldn't, access separate submodule repos > otherwise). But eventually we need to access objects from the right > repo. > > Because the same commit could sometimes be present in both 'submodule' > and 'sub', if there is a bug looking up objects in the wrong repo, > sometimes it will go unnoticed because it finds the needed object in the > wrong repo anyway. > > Fix this by changing commit time after every commit. This makes all > commits unique. Of course there are still identical blobs in different > repos, but because we often lookup commit first, then tree and blob, > unique commits are already quite safe. > > Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx> > --- > > And I can't quite understand how t7814 sometimes passed. > > I do now. This patch makes it fail consistently for me. Well analysed. Very well done. Thanks.
