$ git clone -n https://src.fedoraproject.org/rpms/perl-BZ-Client.git /var/lib/mock/f39-build-1486224-34464/root/chroot_tmpdir/scmroot/perl-BZ-Client
Cloning into '/var/lib/mock/f39-build-1486224-34464/root/chroot_tmpdir/scmroot/perl-BZ-Client'...
$ git fetch origin 6d57f7a9743a8168e4bddb67057f66282fde08e7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-BZ-Client
 * [new ref]         6d57f7a9743a8168e4bddb67057f66282fde08e7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d57f7a Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild