$ git clone -n https://src.fedoraproject.org/rpms/sipp.git /var/lib/mock/f45-build-36101-701/root/chroot_tmpdir/scmroot/sipp
Cloning into '/var/lib/mock/f45-build-36101-701/root/chroot_tmpdir/scmroot/sipp'...
$ git fetch origin 45c182b2d0b773345d90d70dc179c8806bde0f29:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sipp
 * [new ref]         45c182b2d0b773345d90d70dc179c8806bde0f29 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 45c182b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild