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[[!template id=plugin name=cvs core=0 author="[[schmonz]]"]]
[[!template id=gitbranch branch=schmonz author="[[schmonz]]"]]
This plugin allows ikiwiki to use [[!wikipedia desc="CVS" Concurrent Versions System]] as an [[rcs]].
### Usage
7. Install [cvsps](http://www.cobite.com/cvsps/), [[!cpan IPC::Cmd]], [[!cpan String::ShellQuote]], and [cvsweb](http://www.freebsd.org/projects/cvsweb.html) or the like.
7. Adjust CVS-related parameters in your setup file.
Consider creating `$HOME/.cvsrc` if you don't have one already; the plugin doesn't need it, but you yourself might. Here's a good general-purpose one:
cvs -q
checkout -P
update -dP
diff -u
rdiff -u
### Implementation details
* `cvs.pm` started life as a copy of [[3.14159|news/version_3.14159]]'s `svn.pm`.
* `IkiWiki.pm:wiki_file_prune_regexps` avoids copying CVS metadata into `$DESTDIR`.
* [[ikiwiki-makerepo]]:
* creates a repository,
* imports `$SRCDIR` into top-level module `ikiwiki` (vendor tag IKIWIKI, release tag PRE_CVS),
* creates a small post-commit wrapper to prevent `cvs add <directory>` from being seen by ikiwiki's [[post-commit]] hook (and avoid `cvs` locking against itself),
* configures the wrapper itself as a post-commit hook in `CVSROOT/loginfo`.
* CVS multi-directory commits happen separately; the post-commit hook sees only the first directory's changes in time for [[recentchanges|plugins/recentchanges]]. The next run of `ikiwiki --setup` will correctly re-render such a recentchanges entry. It should be possible to solve this problem with NetBSD's `commit_prep` and `log_accum` scripts (see below).
### To do
* Add automated tests. (Blindly adding svn-like tests to `t/file_pruned.t` doesn't do the trick.)
* If the argument to `cvs add` smells like a binary file, `cvs add -kb` it (for [[plugins/attachment]] support).
* Don't slurp the entire `cvsps` output into memory (!).
* Instead of resource-intensively scraping changesets with `cvsps`, have `ikiwiki-makerepo` set up NetBSD-like `log_accum` and `commit_prep` scripts that coalesce and keep records of commits. `cvsps` can be used as a fallback for repositories without such records.
* Perhaps prevent web edits from attempting to create `.../CVS/foo.mdwn` (and `.../cvs/foo.mdwn` on case-insensitive filesystems); thanks to the CVS metadata directory, the attempt will fail anyway (and much more confusingly) if we don't.
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