$ git clone -n https://src.fedoraproject.org/rpms/rust-scroll.git /var/lib/mock/f45-build-44701-816/root/chroot_tmpdir/scmroot/rust-scroll
Cloning into '/var/lib/mock/f45-build-44701-816/root/chroot_tmpdir/scmroot/rust-scroll'...
$ git fetch origin 63949d303e656858000579d1a17b382fced13d9b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-scroll
 * [new ref]         63949d303e656858000579d1a17b382fced13d9b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63949d3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild