$ git clone -n https://src.fedoraproject.org/rpms/gdk-pixbuf2-xlib.git /var/lib/mock/f45-build-9675-407/root/chroot_tmpdir/scmroot/gdk-pixbuf2-xlib
Cloning into '/var/lib/mock/f45-build-9675-407/root/chroot_tmpdir/scmroot/gdk-pixbuf2-xlib'...
$ git fetch origin 447c17391cbdede8a479bf46bd51637857a53b01:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gdk-pixbuf2-xlib
 * [new ref]         447c17391cbdede8a479bf46bd51637857a53b01 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 447c173 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild