[llvm-dev] How to deal with accidental directory tree deletes, downstream?

Mikael Holmén via llvm-dev llvm-dev at lists.llvm.org
Thu Apr 18 00:11:21 PDT 2019


Isn't this a bit of a nuisance also directly on trunk and not only for 
downstream repos?

If I do e.g.

  git blame test/Transforms/LoopUnroll/basic.ll

then every line in the file is attributed to the commit where the 
testcases were added back again.


  gitk test/Transforms/LoopUnroll/basic.ll

older commits are shown as well so it's not like all history is gone, 
but at least blame is messed up.

For our downstream clone, we didn't merge from trunk to our 
development-branch while the testcases were gone, so we never got any 
conflicts at all, and since the tests were later put back I think the 
situation for us now is the same as being directly on trunk.


On 4/17/19 2:35 PM, via llvm-dev wrote:
> Hello fellow downstream residents,
> I see that r358546 accidentally deleted an entire subtree, which was
> reverted in r358552.  This of course caused a big merge conflict in
> our local repo, and internally we've been debating tactics for dealing
> with it, hopefully without losing our original history.
> Has anyone else handled this in a way that they are happy with?  We
> found a StackOverflow post that is potentially helpful:
> https://stackoverflow.com/questions/44990103/how-to-undelete-file-in-git-and-keep-his-original-blame-history
> Doing this on our local copy of the upstream repo means we would not
> have an exact copy anymore, which seems like a Bad Idea.
> Is there a smooth way to resolve the merge conflict that does *not*
> delete our local tree? I suppose we can somehow not accept the
> accidental deletes, and then when we run forward to r358552 it will
> decide we already have those files and it will Just Work?
> Tips and hints welcome.
> Thanks,
> --paulr
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