$ git clone -n https://src.fedoraproject.org/rpms/gnome-software.git /var/lib/mock/f39-build-1650793-40483/root/chroot_tmpdir/scmroot/gnome-software
Cloning into '/var/lib/mock/f39-build-1650793-40483/root/chroot_tmpdir/scmroot/gnome-software'...
$ git fetch origin ebd9360857f898482aaec126fbf0e949767dee8a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-software
 * [new ref]         ebd9360857f898482aaec126fbf0e949767dee8a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ebd9360 Update to 45.1