On Mon, Jul 29, 2019 at 04:19:47PM +0200, Tamas Papp wrote:

Generate 100k file into a repository:

#!/bin/bash

rm -rf .git test.file
git init
git config user.email a@b
git config user.name c

time for i in {1..100000}
do
  [ $((i % 2)) -eq 1 ] && echo $i>test.file || echo 0 >test.file
  git add test.file

  git commit -m "$i committed"

done

I lost patience kicking off two hundred thousand processes. Try this:

  for i in {1..100000}
  do
    echo "commit HEAD"
    echo "committer c <a@b> $i +0000"
    echo "data <<EOF"
    echo "$i committed"
    echo "EOF"
    echo
  done | git fast-import

which runs much faster. This doesn't change any files in each commit,
but I don't think it's necessary for what you're showing (name-rev
wouldn't ever look at the trees).

Run git on it:

$ git name-rev a20f6989b75fa63ec6259a988e38714e1f5328a0

Anybody who runs your script will get a different sha1 because of the
change in timestamps. I guess this is HEAD, though. I also needed to
have an actual tag to find. So:

  git tag old-tag HEAD~99999
  git name-rev HEAD

segfaults for me.

Could you coment on it?

This is a known issue. The algorithm used by name-rev is recursive, and
you can run out of stack space in some deep cases. There's more
discussion this thread:

  https://public-inbox.org/git/6a4cbbee-ffc6-739b-d649-079ba01439ca@grubix.eu/

including some patches that document the problem with an expected
failure in our test suite. Nobody has actually rewritten the C code yet,
though.

-Peff