$ git clone -n https://src.fedoraproject.org/rpms/rubygem-tk.git /var/lib/mock/f40-build-777977-129679/root/chroot_tmpdir/scmroot/rubygem-tk
Cloning into '/var/lib/mock/f40-build-777977-129679/root/chroot_tmpdir/scmroot/rubygem-tk'...
$ git fetch origin 3d96c2213e7407b22b9717b33a43cd289cde94a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-tk
 * [new ref]         3d96c2213e7407b22b9717b33a43cd289cde94a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d96c22 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild