$ git clone -n https://src.fedoraproject.org/rpms/rust-dyn-clone.git /var/lib/mock/f40-build-2092044-50259/root/chroot_tmpdir/scmroot/rust-dyn-clone
Cloning into '/var/lib/mock/f40-build-2092044-50259/root/chroot_tmpdir/scmroot/rust-dyn-clone'...
$ git fetch origin fd173d092c41204481c2cdf2dbe8bb8362a5e86c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-dyn-clone
 * [new ref]         fd173d092c41204481c2cdf2dbe8bb8362a5e86c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fd173d0 Update to version 1.0.16; Fixes RHBZ#2247732