$ git clone -n https://src.fedoraproject.org/rpms/rust-nettle.git /var/lib/mock/f45-build-43344-802/root/chroot_tmpdir/scmroot/rust-nettle
Cloning into '/var/lib/mock/f45-build-43344-802/root/chroot_tmpdir/scmroot/rust-nettle'...
$ git fetch origin 4f9fedca9c64fbe2b42b8492012628bd4360ebb3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nettle
 * [new ref]         4f9fedca9c64fbe2b42b8492012628bd4360ebb3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4f9fedc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild