$ git clone -n https://src.fedoraproject.org/rpms/perl-Regexp-Grammars.git /var/lib/mock/f40-build-2020508-46635/root/chroot_tmpdir/scmroot/perl-Regexp-Grammars
Cloning into '/var/lib/mock/f40-build-2020508-46635/root/chroot_tmpdir/scmroot/perl-Regexp-Grammars'...
$ git fetch origin 82bdfa349a0d02ec257bddd039e11419d1787d1e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Regexp-Grammars
 * [new ref]         82bdfa349a0d02ec257bddd039e11419d1787d1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82bdfa3 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild