$ git clone -n https://src.fedoraproject.org/rpms/xcb-imdkit.git /var/lib/mock/f45-build-38631-726/root/chroot_tmpdir/scmroot/xcb-imdkit
Cloning into '/var/lib/mock/f45-build-38631-726/root/chroot_tmpdir/scmroot/xcb-imdkit'...
$ git fetch origin 2560bdf02a6db1e040627b602ff59b7260620925:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xcb-imdkit
 * [new ref]         2560bdf02a6db1e040627b602ff59b7260620925 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2560bdf Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild