$ git clone -n https://src.fedoraproject.org/rpms/rust-ecdsa.git /var/lib/mock/f40-build-2036088-48007/root/chroot_tmpdir/scmroot/rust-ecdsa
Cloning into '/var/lib/mock/f40-build-2036088-48007/root/chroot_tmpdir/scmroot/rust-ecdsa'...
$ git fetch origin 6cb4d2bce0d65d2a8122177b3113922654b6e9d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ecdsa
 * [new ref]         6cb4d2bce0d65d2a8122177b3113922654b6e9d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6cb4d2b Update to version 0.16.9; Fixes RHBZ#2250112