$ git clone -n https://src.fedoraproject.org/rpms/rust-regex-test.git /var/lib/mock/f40-build-2327187-58851/root/chroot_tmpdir/scmroot/rust-regex-test
Cloning into '/var/lib/mock/f40-build-2327187-58851/root/chroot_tmpdir/scmroot/rust-regex-test'...
$ git fetch origin b31aeb8ed80279dcf1796044c0d8d7c77e1577ae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-regex-test
 * [new ref]         b31aeb8ed80279dcf1796044c0d8d7c77e1577ae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b31aeb8 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild