$ git clone -n https://src.fedoraproject.org/rpms/rust-erdtree.git /var/lib/mock/f38-build-side-42-init-devel-1158691-30557/root/chroot_tmpdir/scmroot/rust-erdtree
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1158691-30557/root/chroot_tmpdir/scmroot/rust-erdtree'...
$ git fetch origin ad6f4799d58ea3a7188b4d36b9cc169e04d6bc8f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-erdtree
 * [new ref]         ad6f4799d58ea3a7188b4d36b9cc169e04d6bc8f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad6f479 Update to version 3.1.2 (rhbz#2219113)