$ git clone -n https://src.fedoraproject.org/rpms/rust-x509-certificate.git /var/lib/mock/f45-build-46223-832/root/chroot_tmpdir/scmroot/rust-x509-certificate
Cloning into '/var/lib/mock/f45-build-46223-832/root/chroot_tmpdir/scmroot/rust-x509-certificate'...
$ git fetch origin 4230ac0f599d12c7569e091f7de8818cc8b71e99:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-x509-certificate
 * [new ref]         4230ac0f599d12c7569e091f7de8818cc8b71e99 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4230ac0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild