$ git clone -n https://src.fedoraproject.org/rpms/gprbuild.git /var/lib/mock/f39-build-2536829-61806/root/chroot_tmpdir/scmroot/gprbuild
Cloning into '/var/lib/mock/f39-build-2536829-61806/root/chroot_tmpdir/scmroot/gprbuild'...
$ git fetch origin 535b68fde574900dde22b2dea98caa3e261c156d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gprbuild
 * [new ref]         535b68fde574900dde22b2dea98caa3e261c156d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 535b68f Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild