$ git clone -n https://src.fedoraproject.org/rpms/g3kb-switch.git /var/lib/mock/f37-build-side-32-misc-devel-776145-27830/root/chroot_tmpdir/scmroot/g3kb-switch
Cloning into '/var/lib/mock/f37-build-side-32-misc-devel-776145-27830/root/chroot_tmpdir/scmroot/g3kb-switch'...
$ git fetch origin e7b3793037d15f6fcb3320c7c061f0783f75c762:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/g3kb-switch
 * [new ref]         e7b3793037d15f6fcb3320c7c061f0783f75c762 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7b3793 version 1.2 (rhbz#2188905)