$ git clone -n https://gitee.com/wency_cn/libexif.git /var/lib/mock/dist-an23-build-502358-74802/root/chroot_tmpdir/scmroot/libexif
Cloning into '/var/lib/mock/dist-an23-build-502358-74802/root/chroot_tmpdir/scmroot/libexif'...
$ git fetch origin b844533e4177058776b2c25fe8cb9c1f9ab75c7b:KOJI_FETCH_HEAD
From https://gitee.com/wency_cn/libexif
 * [new ref]         b844533e4177058776b2c25fe8cb9c1f9ab75c7b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b844533 Update code from upstream