$ git clone -n https://gitee.com/yueeranna/GraphicsMagick.git /var/lib/mock/dist-an23-epao-build-374123-71602/root/chroot_tmpdir/scmroot/GraphicsMagick
Cloning into '/var/lib/mock/dist-an23-epao-build-374123-71602/root/chroot_tmpdir/scmroot/GraphicsMagick'...
$ git fetch origin c2c91021f124ca4377040f22e19a65a5fd850e6e:KOJI_FETCH_HEAD
From https://gitee.com/yueeranna/GraphicsMagick
 * [new ref]         c2c91021f124ca4377040f22e19a65a5fd850e6e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2c9102 init from upstream