$ git clone -n https://src.fedoraproject.org/rpms/xtrkcad.git /var/lib/mock/f45-build-39263-733/root/chroot_tmpdir/scmroot/xtrkcad
Cloning into '/var/lib/mock/f45-build-39263-733/root/chroot_tmpdir/scmroot/xtrkcad'...
$ git fetch origin d2f3557fe457084caedc8c29c85f736e1a4d4bc1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xtrkcad
 * [new ref]         d2f3557fe457084caedc8c29c85f736e1a4d4bc1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d2f3557 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild