$ git clone -n https://src.fedoraproject.org/rpms/libtbox.git /var/lib/mock/f40-build-2219644-52639/root/chroot_tmpdir/scmroot/libtbox
Cloning into '/var/lib/mock/f40-build-2219644-52639/root/chroot_tmpdir/scmroot/libtbox'...
$ git fetch origin 01ead175fb3ec612d238c986dad21a12c1727412:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libtbox
 * [new ref]         01ead175fb3ec612d238c986dad21a12c1727412 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 01ead17 Initial packaging (fedora#2249637)