$ git clone -n https://src.fedoraproject.org/rpms/rust-prefixdevname.git /var/lib/mock/f45-build-43990-809/root/chroot_tmpdir/scmroot/rust-prefixdevname
Cloning into '/var/lib/mock/f45-build-43990-809/root/chroot_tmpdir/scmroot/rust-prefixdevname'...
$ git fetch origin 3008db878a00a83124c3db48f31fdbdbfef6db27:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-prefixdevname
 * [new ref]         3008db878a00a83124c3db48f31fdbdbfef6db27 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3008db8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild