$ git clone -n https://src.fedoraproject.org/rpms/rust-rkyv_derive.git /var/lib/mock/f40-build-2251105-54114/root/chroot_tmpdir/scmroot/rust-rkyv_derive
Cloning into '/var/lib/mock/f40-build-2251105-54114/root/chroot_tmpdir/scmroot/rust-rkyv_derive'...
$ git fetch origin 150e069aab251b9f3cc333405e7e2a6634b099b6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rkyv_derive
 * [new ref]         150e069aab251b9f3cc333405e7e2a6634b099b6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 150e069 Update to version 0.7.43; Fixes RHBZ#2254896