$ git clone -n https://src.fedoraproject.org/rpms/execstack.git /var/lib/mock/f45-build-8531-390/root/chroot_tmpdir/scmroot/execstack
Cloning into '/var/lib/mock/f45-build-8531-390/root/chroot_tmpdir/scmroot/execstack'...
$ git fetch origin 6d1c38bdf54ff936f94b83c7d2a6b015423658f8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/execstack
 * [new ref]         6d1c38bdf54ff936f94b83c7d2a6b015423658f8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d1c38b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild