$ git clone -n https://src.fedoraproject.org/rpms/librepo.git /var/lib/mock/f42-build-3164372-40907/root/chroot_tmpdir/scmroot/librepo
Cloning into '/var/lib/mock/f42-build-3164372-40907/root/chroot_tmpdir/scmroot/librepo'...
$ git fetch origin 73a632fd3326f18debae979a9e0f34840ee6faf5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/librepo
 * [new ref]         73a632fd3326f18debae979a9e0f34840ee6faf5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 73a632f Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild