$ git clone -n https://src.fedoraproject.org/rpms/rust-zvariant_derive.git /var/lib/mock/f40-build-1466307-23684/root/chroot_tmpdir/scmroot/rust-zvariant_derive
Cloning into '/var/lib/mock/f40-build-1466307-23684/root/chroot_tmpdir/scmroot/rust-zvariant_derive'...
$ git fetch origin ef6009ed1819bffeec5892cd73a3faf879321812:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zvariant_derive
 * [new ref]         ef6009ed1819bffeec5892cd73a3faf879321812 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef6009e Update to version 4.1.2; Fixes RHBZ#2295596