$ git clone -n https://src.fedoraproject.org/forks/sfaulken/rpms/screengrab.git /var/lib/mock/f43-build-58908679-6569188/root/chroot_tmpdir/scmroot/screengrab
Cloning into '/var/lib/mock/f43-build-58908679-6569188/root/chroot_tmpdir/scmroot/screengrab'...
$ git fetch origin 07d7a6e22142a6f73e1034ea1aece4c6ab1bf1e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/sfaulken/rpms/screengrab
 * [new ref]         07d7a6e22142a6f73e1034ea1aece4c6ab1bf1e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 07d7a6e 2.10.0