$ git clone -n https://src.fedoraproject.org/rpms/rust-digest.git /var/lib/mock/f38-build-side-43-rust-devel-1418080-31459/root/chroot_tmpdir/scmroot/rust-digest
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1418080-31459/root/chroot_tmpdir/scmroot/rust-digest'...
$ git fetch origin d74ceb58e0375364333c19c5b849804fc7f7be4c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-digest
 * [new ref]         d74ceb58e0375364333c19c5b849804fc7f7be4c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d74ceb5 Update to version 0.10.7; Fixes RHBZ#2155057