$ git clone -n https://src.fedoraproject.org/rpms/rust-textwrap0.15.git /var/lib/mock/f45-build-45466-823/root/chroot_tmpdir/scmroot/rust-textwrap0.15
Cloning into '/var/lib/mock/f45-build-45466-823/root/chroot_tmpdir/scmroot/rust-textwrap0.15'...
$ git fetch origin f971e0e5e7747dd0acd54d6e3549f1eee2e86a17:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-textwrap0.15
 * [new ref]         f971e0e5e7747dd0acd54d6e3549f1eee2e86a17 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f971e0e Regenerate with rust2rpm v28