$ git clone -n https://src.fedoraproject.org/rpms/emacs-rpm-spec-mode.git /var/lib/mock/f45-build-8121-377/root/chroot_tmpdir/scmroot/emacs-rpm-spec-mode
Cloning into '/var/lib/mock/f45-build-8121-377/root/chroot_tmpdir/scmroot/emacs-rpm-spec-mode'...
$ git fetch origin 90c0d0f94b1839608a638606b6fc08810dee8582:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs-rpm-spec-mode
 * [new ref]         90c0d0f94b1839608a638606b6fc08810dee8582 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 90c0d0f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild