搞来搞去，原来是hooks 下面的脚本名称必须是post-commit才可以， 写成fly-commit一直不行。晕死~~~
https://serverfault.com/questions/144181/subversion-hooks-no-longer-running
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For some reason, Subversion no longer seems to accept arbitrary extensions on hook scripts. I did have the hooks named like 'post-commit.sh', but Subversion no longer seems to look for these. After renaming the hook script to 'post-commit', Subversion ran it right away.
I'm not sure what revision to Subversion changed this behavior, and it is not mentioned in the CHANGES file for 1.6.11.