$ git clone -n https://src.fedoraproject.org/rpms/rust-zvariant_derive.git /var/lib/mock/f45-build-46395-834/root/chroot_tmpdir/scmroot/rust-zvariant_derive
Cloning into '/var/lib/mock/f45-build-46395-834/root/chroot_tmpdir/scmroot/rust-zvariant_derive'...
$ git fetch origin c7ab78be3a092203dde387fa3f030de7021c6303:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zvariant_derive
 * [new ref]         c7ab78be3a092203dde387fa3f030de7021c6303 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c7ab78b Update to version 5.15.0; Fixes RHBZ#2512961