$ git clone -n https://src.fedoraproject.org/rpms/gstreamermm.git /var/lib/mock/f40-build-2290234-55961/root/chroot_tmpdir/scmroot/gstreamermm
Cloning into '/var/lib/mock/f40-build-2290234-55961/root/chroot_tmpdir/scmroot/gstreamermm'...
$ git fetch origin ab76777c1deecb39079ba4b012e879e0f5a34a9b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamermm
 * [new ref]         ab76777c1deecb39079ba4b012e879e0f5a34a9b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ab76777 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild