问题
can we set svn:external for a single file in debian
回答1:
Yes you can if can you use svn version >= 1.6.
http://subversion.tigris.org/svn_1.6_releasenotes.html#externals
...as drobert pointed out in a comment, svn 1.6 is still experimental in debian.
回答2:
an externals definition can only point to directories, not files.
来源：https://stackoverflow.com/questions/1371583/can-we-set-svnexternal-for-a-single-file-in-debian