$ git clone -n https://src.fedoraproject.org/rpms/rust-virtue.git /var/lib/mock/f45-build-46075-830/root/chroot_tmpdir/scmroot/rust-virtue
Cloning into '/var/lib/mock/f45-build-46075-830/root/chroot_tmpdir/scmroot/rust-virtue'...
$ git fetch origin 86a7dcf33299d2b7bd2cb801c9fac70b196f3e71:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-virtue
 * [new ref]         86a7dcf33299d2b7bd2cb801c9fac70b196f3e71 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86a7dcf Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild