$ git clone -n https://src.fedoraproject.org/rpms/rust-zvariant_derive.git /var/lib/mock/f42-build-side-1-3584215-46892/root/chroot_tmpdir/scmroot/rust-zvariant_derive
Cloning into '/var/lib/mock/f42-build-side-1-3584215-46892/root/chroot_tmpdir/scmroot/rust-zvariant_derive'...
$ git fetch origin 2f2f0656f88eb4ccf559ce1241790b9f5c624f16:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zvariant_derive
 * [new ref]         2f2f0656f88eb4ccf559ce1241790b9f5c624f16 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2f2f065 Update to version 5.6.0