$ git clone -n https://src.fedoraproject.org/rpms/rust-rkyv.git /var/lib/mock/f40-build-2260571-54413/root/chroot_tmpdir/scmroot/rust-rkyv
Cloning into '/var/lib/mock/f40-build-2260571-54413/root/chroot_tmpdir/scmroot/rust-rkyv'...
$ git fetch origin 658a0775a9c0b812153b1f70a953cc2b9d941e6a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rkyv
 * [new ref]         658a0775a9c0b812153b1f70a953cc2b9d941e6a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 658a077 Update to version 0.7.43; Fixes RHBZ#2254897