$ git clone -n https://src.fedoraproject.org/rpms/pbuilder.git /var/lib/mock/f39-build-1470221-33885/root/chroot_tmpdir/scmroot/pbuilder
Cloning into '/var/lib/mock/f39-build-1470221-33885/root/chroot_tmpdir/scmroot/pbuilder'...
$ git fetch origin 298dbf16e7678d30599e3733c72ac6e0fb10fc66:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pbuilder
 * [new ref]         298dbf16e7678d30599e3733c72ac6e0fb10fc66 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 298dbf1 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild