$ git clone -n https://src.fedoraproject.org/rpms/R-jpeg.git /var/lib/mock/f40-build-2270081-54793/root/chroot_tmpdir/scmroot/R-jpeg
Cloning into '/var/lib/mock/f40-build-2270081-54793/root/chroot_tmpdir/scmroot/R-jpeg'...
$ git fetch origin cfbd3c5be4d5f7ee86ad01a8c7654dba69c33a34:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-jpeg
 * [new ref]         cfbd3c5be4d5f7ee86ad01a8c7654dba69c33a34 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cfbd3c5 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild