$ git clone -n https://src.fedoraproject.org/rpms/fernflower.git /var/lib/mock/f45-build-8920-397/root/chroot_tmpdir/scmroot/fernflower
Cloning into '/var/lib/mock/f45-build-8920-397/root/chroot_tmpdir/scmroot/fernflower'...
$ git fetch origin 3b0556136d1a54b22fc7becfad5fd353fac11b41:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fernflower
 * [new ref]         3b0556136d1a54b22fc7becfad5fd353fac11b41 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b05561 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild