Basically, what I want to do here is to retrieve a certain file from any two revisions (directly from the repository), and compute the delta between these two file versions. So I need to know first how can I retrieve a certain file from any revision of the repository (what functions I can use in the current code base? etc.), and how to compute the delta (I may directly use the functions in \libsvn_delta\txdelta.c). Do you have any suggestion for me?
Thanks. Bo On Sat, Apr 6, 2013 at 1:50 AM, Ben Reser <b...@reser.org> wrote: > On Fri, Apr 5, 2013 at 10:02 PM, Bo Chen <bo.irvine.c...@gmail.com> wrote: > > I need help for the following two questions. Any help will be > appreciated. > > > > 1 Given a revision number, which function can (should be in > libsvn_fs_fs/) > > can read the corresponding revision from the repository (FSFS)? > > You really shouldn't be using libsvn_fs_fs directly and should use > libsvn_repos and libsvn_fs. Beyond that I really don't know what you > mean by "read the corresponding revision." There are all sorts of > APIs for getting specific information about a revision. I don't think > we have a function or a structure to represent an entire revision in > memory. Generally you get a revision root by using > svn_fs_revision_root() which gives you a svn_fs_root_t and then you > use functions against it. You may find the source for svnlook > particularly instructive since it provides implementations of a lot of > the type of queries you might want to do. Say you want to find the > nodes changes in a revision, the changed command does this and it does > it by retrieving the revision root, determining the base revision and > then using svn_repos_replay2() to build a svn_repos_node_t tree of the > changed nodes. > > It might be helpful for you to tell us overall what you're doing and > we might be able to point you in the right direction more quickly than > answering these one off questions. > > > 2 For a variable of svn_stream_t, how can I print the information (e.g., > the > > string) stored in this variable. > > If you want something quick and dirty for debugging without worrying > about encoding you probably want to use > svn_stream_for_stdout() or svn_stream_for_stderr() to get stdout or > stderr as a stream and then use svn_stream_copy3(). > > If you need something more permanent and care about the encoding I > think you have to use the svn_cmdline_* functions, which don't take > svn_stream_t's so you'll have to consume the stream with > svn_stream_read() and then write the output with svn_cmdline_*. >
