$ git clone -n https://src.fedoraproject.org/rpms/rust-if_chain.git /var/lib/mock/f45-build-42513-794/root/chroot_tmpdir/scmroot/rust-if_chain
Cloning into '/var/lib/mock/f45-build-42513-794/root/chroot_tmpdir/scmroot/rust-if_chain'...
$ git fetch origin bc86de55929bdff8ecb77e07a3adf53d5b1971ac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-if_chain
 * [new ref]         bc86de55929bdff8ecb77e07a3adf53d5b1971ac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc86de5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild