$ git clone -n https://src.fedoraproject.org/rpms/fish.git /var/lib/mock/f40-build-2198154-51689/root/chroot_tmpdir/scmroot/fish
Cloning into '/var/lib/mock/f40-build-2198154-51689/root/chroot_tmpdir/scmroot/fish'...
$ git fetch origin 3f5fc3b029de157467b66e088ca6e3fe3be62d4a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fish
 * [new ref]         3f5fc3b029de157467b66e088ca6e3fe3be62d4a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3f5fc3b New upstream release 3.7.0 (Resolves: rhbz#2256375)