$ git clone -n https://src.fedoraproject.org/rpms/rust-sec1.git /var/lib/mock/f38-build-side-42-init-devel-1089068-30041/root/chroot_tmpdir/scmroot/rust-sec1
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1089068-30041/root/chroot_tmpdir/scmroot/rust-sec1'...
$ git fetch origin 39c193761a207d729c0a7d840c445bf2992d3aea:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sec1
 * [new ref]         39c193761a207d729c0a7d840c445bf2992d3aea -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39c1937 Update to version 0.7.3; Fixes RHBZ#2223234