$ git clone -n https://src.fedoraproject.org/rpms/diffpdf.git /var/lib/mock/f40-build-2276641-55173/root/chroot_tmpdir/scmroot/diffpdf
Cloning into '/var/lib/mock/f40-build-2276641-55173/root/chroot_tmpdir/scmroot/diffpdf'...
$ git fetch origin 63a8a884105e50aaba0cb1717d888159701afc13:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/diffpdf
 * [new ref]         63a8a884105e50aaba0cb1717d888159701afc13 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63a8a88 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild