$ git clone -n https://src.fedoraproject.org/rpms/rust-failure.git /var/lib/mock/f38-build-side-42-init-devel-1394464-31050/root/chroot_tmpdir/scmroot/rust-failure
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1394464-31050/root/chroot_tmpdir/scmroot/rust-failure'...
$ git fetch origin 5e45e3ed785ce1fb3cbf135e4ffbf76706c73fca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-failure
 * [new ref]         5e45e3ed785ce1fb3cbf135e4ffbf76706c73fca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5e45e3e Regenerate with rust2rpm v24, mark as deprecated