$ git clone -n https://gitee.com/sys0613/gdk-pixbuf2.git /var/lib/mock/dist-an8.7-build-273648-64202/root/chroot_tmpdir/scmroot/gdk-pixbuf2
Cloning into '/var/lib/mock/dist-an8.7-build-273648-64202/root/chroot_tmpdir/scmroot/gdk-pixbuf2'...
$ git fetch origin b8921dddd1307eda261a0ede8825fd78198ef144:KOJI_FETCH_HEAD
From https://gitee.com/sys0613/gdk-pixbuf2
 * [new ref]         b8921dddd1307eda261a0ede8825fd78198ef144 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b8921dd Add doc sub package