$ git clone -n https://src.fedoraproject.org/rpms/rust-dyn-clone.git /var/lib/mock/f39-build-1455438-32915/root/chroot_tmpdir/scmroot/rust-dyn-clone
Cloning into '/var/lib/mock/f39-build-1455438-32915/root/chroot_tmpdir/scmroot/rust-dyn-clone'...
$ git fetch origin 4527825ee3b6d2a1d554b77abffab563e2f0e9d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-dyn-clone
 * [new ref]         4527825ee3b6d2a1d554b77abffab563e2f0e9d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4527825 Update to version 1.0.14; Fixes RHBZ#2239574