$ git clone -n https://gitee.com/sys0613/btrfs-progs.git /var/lib/mock/dist-an7_9-updates-build-276106-64307/root/chroot_tmpdir/scmroot/btrfs-progs
Cloning into '/var/lib/mock/dist-an7_9-updates-build-276106-64307/root/chroot_tmpdir/scmroot/btrfs-progs'...
$ git fetch origin 7e4a62f674e59c61b7b88e61c07861188bd3cd20:KOJI_FETCH_HEAD
From https://gitee.com/sys0613/btrfs-progs
 * [new ref]         7e4a62f674e59c61b7b88e61c07861188bd3cd20 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e4a62f Refactor the spec file