$ git clone -n https://src.fedoraproject.org/rpms/rust-bytemuck.git /var/lib/mock/f42-build-side-1-3583027-46887/root/chroot_tmpdir/scmroot/rust-bytemuck
Cloning into '/var/lib/mock/f42-build-side-1-3583027-46887/root/chroot_tmpdir/scmroot/rust-bytemuck'...
$ git fetch origin f4727ffde271199c2dd86bf681e94cfa99ff27ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bytemuck
 * [new ref]         f4727ffde271199c2dd86bf681e94cfa99ff27ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f4727ff Update to version 1.23.1; Fixes RHBZ#2371009