> Yes, ikiwiki does expect you to use your revision control system to check
> in changes. Otherwise, recentchanges cannot work right, since it uses the
> commit history from your revision control system. --[[Joey]]
+
+-----
+
+I'm working on an [[rcs]] plugin for CVS, adapted from `svn.pm`, in order
+to integrate ikiwiki at sites where that's all they've got. What's working
+so far: web commit (post-commit hook and all), diff, add (under certain
+conditions), and remove. What's not working: with rcs_add(), iff any of the
+new page's parent dirs aren't already under CVS control and the post-commit
+hook is enabled, the browser and ikiwiki stall for several seconds trying
+to add it, then time out. (If I kill ikiwiki when this is happening, it cvs
+adds the topmost parent that needed adding; if I wait for timeout, it
+doesn't. I think.) If I disable the post-commit hook and do the same kind
+of thing, the page is created and saved.
+
+In case you're lucky enough not to know, cvs adds on directories are weird
+-- they operate immediately against the repository, unlike file adds:
+
+ $ cvs add randomdir
+ Directory /Users/schmonz/Documents/cvswiki/repository/ikiwiki/randomdir added to the repository
+
+I was able to work out that when I'm seeing this page save misbehavior, my
+plugin is somewhere inside `system("cvs", "-Q", "add", "$file")`, which was
+never returning. If I changed it to anything other than cvs it iterated
+correctly over all the parent dirs which needed to be added to CVS, in the
+proper order. (cvs add isn't recursive, sadly.)
+
+Can you offer an educated guess what's going wrong here? --[[Schmonz]]
+
+> Got `rcs_recentchanges` working, believe it or not, thanks to
+> [cvsps](http://www.cobite.com/cvsps/). If I can figure out this
+> interaction between the post-commit hook and `cvs add` on directories,
+> the CVS plugin is mostly done. Could it be a locking issue? Where should
+> I be looking? Any suggestions appreciated. --[[Schmonz]]
+
+>> Locking certianly seems likely to be a problem. ikiwiki calls `rcs_add`
+>> *before* disabling the post-commit plugin, since all over VCS allow
+>> adding something in a staged manner. You can see this in, for example,
+>> `editpage.pm` lines 391+.
+>>
+>> So I guess what happens is that ikiwiki has taken the wiki lock, calls
+>> `rcs_add`, which does a `cvs add`, which runs the post commit hook,
+>> since it is not disabled -- which blocks waiting for the wiki lock.
+>>
+>> I guess you can fix this in either of three ways: Modify lots of places
+>> in ikiwiki to disable the post commit hook before calling `rcs_add`,
+>> or make cvs's `rcs_add` temporarily disable the commit hook and
+>> re-enable it (but only if it was not already disabled, somehow),
+>> or make cvs's `rcs_add` only make note that it needs to call `cvs add`
+>> later, and do so at `rcs_commit`. The last of these seems easist,
+>> especially since ikiwiki always commits after an add, in the same
+>> process, so you could just use a temporary list of things to add.
+>> --[[Joey]]
sipb-www / ikiwiki.git / blobdiff