$ git clone -n https://src.fedoraproject.org/rpms/rust-rkyv.git /var/lib/mock/f38-build-side-42-init-devel-1393469-31035/root/chroot_tmpdir/scmroot/rust-rkyv
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1393469-31035/root/chroot_tmpdir/scmroot/rust-rkyv'...
$ git fetch origin 4a40bbf59e0f4520413aa47e634095ff4c796cbb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rkyv
 * [new ref]         4a40bbf59e0f4520413aa47e634095ff4c796cbb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a40bbf Update to version 0.7.42; Fixes RHBZ#2203535