$ git clone -n https://src.fedoraproject.org/rpms/rust-elliptic-curve.git /var/lib/mock/f45-build-41423-782/root/chroot_tmpdir/scmroot/rust-elliptic-curve
Cloning into '/var/lib/mock/f45-build-41423-782/root/chroot_tmpdir/scmroot/rust-elliptic-curve'...
$ git fetch origin 647b21032e9c236bcde5c4dd095ad34a48170f2d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-elliptic-curve
 * [new ref]         647b21032e9c236bcde5c4dd095ad34a48170f2d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 647b210 Update to version 0.14.1; Fixes RHBZ#2491938