$ git clone -n https://src.fedoraproject.org/rpms/gnome-software.git /var/lib/mock/f39-build-1881528-42761/root/chroot_tmpdir/scmroot/gnome-software
Cloning into '/var/lib/mock/f39-build-1881528-42761/root/chroot_tmpdir/scmroot/gnome-software'...
$ git fetch origin 981b42bd37aea8ae69b83c5b5d6544688daeca61:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-software
 * [new ref]         981b42bd37aea8ae69b83c5b5d6544688daeca61 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 981b42b Update to 45.2