$ git clone -n https://src.fedoraproject.org/rpms/rust-uname.git /var/lib/mock/f45-build-45847-828/root/chroot_tmpdir/scmroot/rust-uname
Cloning into '/var/lib/mock/f45-build-45847-828/root/chroot_tmpdir/scmroot/rust-uname'...
$ git fetch origin 6e5c1c12d53b3fd346e628b1305c85682533c45b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uname
 * [new ref]         6e5c1c12d53b3fd346e628b1305c85682533c45b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e5c1c1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild