$ git clone -n https://src.fedoraproject.org/rpms/erlang-hex_core.git /var/lib/mock/f40-build-2609630-63812/root/chroot_tmpdir/scmroot/erlang-hex_core
Cloning into '/var/lib/mock/f40-build-2609630-63812/root/chroot_tmpdir/scmroot/erlang-hex_core'...
$ git fetch origin 4ea1262ecffc91b8c210deddce54acd2370c97f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-hex_core
 * [new ref]         4ea1262ecffc91b8c210deddce54acd2370c97f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4ea1262 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild