$ git clone -n https://gitee.com/src-anolis-os/postgresql.git /var/lib/mock/dist-an8.7-build-130827-46316/root/chroot_tmpdir/scmroot/postgresql
Cloning into '/var/lib/mock/dist-an8.7-build-130827-46316/root/chroot_tmpdir/scmroot/postgresql'...
$ git reset --hard origin/a8
fatal: ambiguous argument 'origin/a8': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'