$ git clone -n https://src.fedoraproject.org/rpms/rust-elliptic-curve.git /var/lib/mock/f40-build-2036105-48007/root/chroot_tmpdir/scmroot/rust-elliptic-curve
Cloning into '/var/lib/mock/f40-build-2036105-48007/root/chroot_tmpdir/scmroot/rust-elliptic-curve'...
$ git fetch origin 91b8e6e97d038e59d766de43231f18c813259d9b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-elliptic-curve
 * [new ref]         91b8e6e97d038e59d766de43231f18c813259d9b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 91b8e6e Update to version 0.13.7; Fixes RHBZ#2249921