$ git clone -n https://src.fedoraproject.org/rpms/rust-uucore.git /var/lib/mock/f45-build-46010-830/root/chroot_tmpdir/scmroot/rust-uucore
Cloning into '/var/lib/mock/f45-build-46010-830/root/chroot_tmpdir/scmroot/rust-uucore'...
$ git fetch origin fa83178ee7540893c651d810d9ea615caa05bccd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uucore
 * [new ref]         fa83178ee7540893c651d810d9ea615caa05bccd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fa83178 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild