$ git clone -n https://src.fedoraproject.org/rpms/perl-Image-Xbm.git /var/lib/mock/f45-build-24302-603/root/chroot_tmpdir/scmroot/perl-Image-Xbm
Cloning into '/var/lib/mock/f45-build-24302-603/root/chroot_tmpdir/scmroot/perl-Image-Xbm'...
$ git fetch origin 9d7ffc6e7965f7bff8633532fd9f7b775114b6f3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Image-Xbm
 * [new ref]         9d7ffc6e7965f7bff8633532fd9f7b775114b6f3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9d7ffc6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild