$ git clone -n https://src.fedoraproject.org/rpms/rust-md-5.git /var/lib/mock/f45-build-43165-800/root/chroot_tmpdir/scmroot/rust-md-5
Cloning into '/var/lib/mock/f45-build-43165-800/root/chroot_tmpdir/scmroot/rust-md-5'...
$ git fetch origin 05a31bd4b44a3b9acc331538effdcaab9ff2dbf6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-md-5
 * [new ref]         05a31bd4b44a3b9acc331538effdcaab9ff2dbf6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 05a31bd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild