$ git clone -n https://src.fedoraproject.org/rpms/libdex.git /var/lib/mock/f40-build-805259-144745/root/chroot_tmpdir/scmroot/libdex
Cloning into '/var/lib/mock/f40-build-805259-144745/root/chroot_tmpdir/scmroot/libdex'...
$ git fetch origin 1ef11fe65251c3610011555d385e991c669c8004:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdex
 * [new ref]         1ef11fe65251c3610011555d385e991c669c8004 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ef11fe Update to 0.6.0 (#2269746)