$ git clone -n https://src.fedoraproject.org/rpms/feh.git /var/lib/mock/f40-build-1817421-24911/root/chroot_tmpdir/scmroot/feh
Cloning into '/var/lib/mock/f40-build-1817421-24911/root/chroot_tmpdir/scmroot/feh'...
$ git fetch origin c39e824dc19c513627a820b26699d230c77bf9d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/feh
 * [new ref]         c39e824dc19c513627a820b26699d230c77bf9d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c39e824 - Update to 3.10.3 fixes rhbz#2295468