$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_repr.git /var/lib/mock/f45-build-44845-818/root/chroot_tmpdir/scmroot/rust-serde_repr
Cloning into '/var/lib/mock/f45-build-44845-818/root/chroot_tmpdir/scmroot/rust-serde_repr'...
$ git fetch origin 66a37d6768f6b9abf35b1afa56d7fc4aeb5f5ffc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_repr
 * [new ref]         66a37d6768f6b9abf35b1afa56d7fc4aeb5f5ffc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66a37d6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild