*[Kyle](http://kitenet.net/~kyle/)=*
+> Took a bit too long, but [[done]] now. --[[Joey]]
+
----
The MediaWiki moving/renaming mechanism is pretty nice. It's easy to get a list of pages that point to the current page. When renaming a page it sticks a forwarding page in the original place. The larger the size of the wiki the more important organization tools become.
-----
-[[!tag patch]]
-
-This is my second cut at a feature like that requested here.
-It can also be found [here](http://ikidev.betacantrips.com/patches/move.patch).
-
-A few shortcomings exist:
-
-* No precautions whatsoever are made to protect against race conditions or failures
- in the rcs\_move function. I didn't even do the `cgi_editpage` thing where I hold
- the lock and render afterwards (mostly because the copy I was editing was not
- up-to-date enough to have that code). Although FAILED_SAVE is in movepage.tmpl,
- no code activates it yet.
-* Some code is duplicated between cgi\_movepage and cgi\_editpage, as well
- as rcs\_commit and rcs\_move.
-* The user interface is pretty lame. I couldn't figure out a good way to let
- the user specify which directory to move things to without implementing a
- FileChooser thing.
-* No redirect pages like those mentioned on [[todo/Moving_Pages]] exist yet,
- so none are created.
-* I added a Move link to page.tmpl but it may belong better someplace else --
- maybe editpage.tmpl? Not sure.
-* from is redundant with page so far -- but since the Move links could someday
- come from someplace other than the page itself I kept it around.
-* If I move foo.mdwn to bar.mdwn, foo/* should move too, probably.
-
-> Looks like a good start, although I agree about many of the points above,
-> and also feel that something needs to be done about rcses that don't
-> implement a move operation -- falling back to an add and delete.
-> --[[Joey]]
-
-Hmm. Shouldn't that be done on a by-RCS basis, though? (i.e. implemented
-by backends in the `rcs_move` function)
-
-> Probably, yes, but maybe there's a way to avoid duplicating code for that
-> in several of them.
-
-Also, how should ikiwiki react if a page is edited (say, by another user)
-before it is moved? Bail, or shrug and proceed?
-
-> The important thing is to keep in mind that the page could be edited,
-> moved, deleted, etc in between the user starting the move and the move
-> happening. So, the code really needs to deal with all of these cases in
-> some way. It seems fine to me to go ahead with the move even if the page
-> was edited. If the page was deleted or moved, it seems reasonable to exit
-> with an error.
-
- diff -urNX ignorepats ikiwiki/IkiWiki/CGI.pm ikidev/IkiWiki/CGI.pm
- --- ikiwiki/IkiWiki/CGI.pm 2007-02-14 18:17:12.000000000 -0800
- +++ ikidev/IkiWiki/CGI.pm 2007-02-22 18:54:23.194982000 -0800
- @@ -561,6 +561,106 @@
- }
- } #}}}
-
- +sub cgi_movepage($$) {
- + my $q = shift;
- + my $session = shift;
- + eval q{use CGI::FormBuilder};
- + error($@) if $@;
- + my @fields=qw(do from rcsinfo page newdir newname comments);
- + my @buttons=("Rename Page", "Cancel");
- +
- + my $form = CGI::FormBuilder->new(
- + fields => \@fields,
- + header => 1,
- + charset => "utf-8",
- + method => 'POST',
- + action => $config{cgiurl},
- + template => (-e "$config{templatedir}/movepage.tmpl" ?
- + {template_params("movepage.tmpl")} : ""),
- + );
- + run_hooks(formbuilder_setup => sub {
- + shift->(form => $form, cgi => $q, session => $session);
- + });
- +
- + decode_form_utf8($form);
- +
- + # This untaint is safe because if the page doesn't exist, bail.
- + my $page = $form->field('page');
- + $page = possibly_foolish_untaint($page);
- + if (! exists $pagesources{$page}) {
- + error("page does not exist");
- + }
- + my $file=$pagesources{$page};
- + my $type=pagetype($file);
- +
- + my $from;
- + if (defined $form->field('from')) {
- + ($from)=$form->field('from')=~/$config{wiki_file_regexp}/;
- + }
- +
- + $form->field(name => "do", type => 'hidden');
- + $form->field(name => "from", type => 'hidden');
- + $form->field(name => "rcsinfo", type => 'hidden');
- + $form->field(name => "newdir", type => 'text', size => 80);
- + $form->field(name => "page", value => $page, force => 1);
- + $form->field(name => "newname", type => "text", size => 80);
- + $form->field(name => "comments", type => "text", size => 80);
- + $form->tmpl_param("can_commit", $config{rcs});
- + $form->tmpl_param("indexlink", indexlink());
- + $form->tmpl_param("baseurl", baseurl());
- +
- + if (! $form->submitted) {
- + $form->field(name => "rcsinfo", value => rcs_prepedit($file),
- + force => 1);
- + }
- +
- + if ($form->submitted eq "Cancel") {
- + redirect($q, "$config{url}/".htmlpage($page));
- + return;
- + }
- +
- + if (! $form->submitted || ! $form->validate) {
- + check_canedit($page, $q, $session);
- + $form->tmpl_param("page_select", 0);
- + $form->field(name => "page", type => 'hidden');
- + $form->field(name => "type", type => 'hidden');
- + $form->title(sprintf(gettext("moving %s"), pagetitle($page)));
- + my $pname = basename($page);
- + my $dname = dirname($page);
- + if (! defined $form->field('newname') ||
- + ! length $form->field('newname')) {
- + $form->field(name => "newname",
- + value => pagetitle($pname, 1), force => 1);
- + }
- + if (! defined $form->field('newdir') ||
- + ! length $form->field('newdir')) {
- + $form->field(name => "newdir",
- + value => pagetitle($dname, 1), force => 1);
- + }
- + print $form->render(submit => \@buttons);
- + }
- + else{
- + # This untaint is safe because titlepage removes any problematic
- + # characters.
- + my ($newname)=$form->field('newname');
- + $newname=titlepage(possibly_foolish_untaint($newname));
- + my ($newdir)=$form->field('newdir');
- + $newdir=titlepage(possibly_foolish_untaint($newdir));
- + if (! defined $newname || ! length $newname || file_pruned($newname, $config{srcdir}) || $newname=~/^\//) {
- + error("bad page name");
- + }
- + check_canedit($page, $q, $session);
- +
- + my $newpage = ($newdir?"$newdir/":"") . $newname;
- + my $newfile = $newpage . ".$type";
- + my $message = $form->field('comments');
- + unlockwiki();
- + rcs_move($file, $newfile, $message, $form->field("rcsinfo"),
- + $session->param("name"), $ENV{REMOTE_ADDR});
- + redirect($q, "$config{url}/".htmlpage($newpage));
- + }
- +}
- +
- sub cgi_getsession ($) { #{{{
- my $q=shift;
-
- @@ -656,6 +756,9 @@
- elsif (defined $session->param("postsignin")) {
- cgi_postsignin($q, $session);
- }
- + elsif ($do eq 'move') {
- + cgi_movepage($q, $session);
- + }
- elsif ($do eq 'prefs') {
- cgi_prefs($q, $session);
- }
- diff -urNX ignorepats ikiwiki/IkiWiki/Rcs/svn.pm ikidev/IkiWiki/Rcs/svn.pm
- --- ikiwiki/IkiWiki/Rcs/svn.pm 2007-01-27 16:04:48.000000000 -0800
- +++ ikidev/IkiWiki/Rcs/svn.pm 2007-02-22 01:51:29.923626000 -0800
- @@ -60,6 +60,34 @@
- }
- } #}}}
-
- +sub rcs_move ($$$$;$$) {
- + my $file=shift;
- + my $newname=shift;
- + my $message=shift;
- + my $rcstoken=shift;
- + my $user=shift;
- + my $ipaddr=shift;
- + if (defined $user) {
- + $message="web commit by $user".(length $message ? ": $message" : "");
- + }
- + elsif (defined $ipaddr) {
- + $message="web commit from $ipaddr".(length $message ? ": $message" : "");
- + }
- +
- + chdir($config{srcdir}); # svn merge wants to be here
- +
- + if (system("svn", "move", "--quiet",
- + "$file", "$newname") != 0) {
- + return 1;
- + }
- + if (system("svn", "commit", "--quiet",
- + "--encoding", "UTF-8", "-m",
- + possibly_foolish_untaint($message)) != 0) {
- + return 1;
- + }
- + return undef # success
- +}
- +
- sub rcs_commit ($$$;$$) { #{{{
- # Tries to commit the page; returns undef on _success_ and
- # a version of the page with the rcs's conflict markers on failure.
- diff -urNX ignorepats ikiwiki/IkiWiki/Render.pm ikidev/IkiWiki/Render.pm
- --- ikiwiki/IkiWiki/Render.pm 2007-02-14 17:00:05.000000000 -0800
- +++ ikidev/IkiWiki/Render.pm 2007-02-22 18:30:00.451755000 -0800
- @@ -80,6 +80,7 @@
-
- if (length $config{cgiurl}) {
- $template->param(editurl => cgiurl(do => "edit", page => $page));
- + $template->param(moveurl => cgiurl(do => "move", page => $page));
- $template->param(prefsurl => cgiurl(do => "prefs"));
- if ($config{rcs}) {
- $template->param(recentchangesurl => cgiurl(do => "recentchanges"));
- diff -urNX ignorepats ikiwiki/templates/movepage.tmpl ikidev/templates/movepage.tmpl
- --- ikiwiki/templates/movepage.tmpl 1969-12-31 16:00:00.000000000 -0800
- +++ ikidev/templates/movepage.tmpl 2007-02-22 18:40:39.751763000 -0800
- @@ -0,0 +1,44 @@
- +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
- + "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
- +<html>
- +<head>
- +<base href="<TMPL_VAR BASEURL>" />
- +<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
- +<title><TMPL_VAR FORM-TITLE></title>
- +<link rel="stylesheet" href="<TMPL_VAR BASEURL>style.css" type="text/css" />
- +<link rel="stylesheet" href="<TMPL_VAR BASEURL>local.css" type="text/css" />
- +<TMPL_IF NAME="FAVICON">
- +<link rel="icon" href="<TMPL_VAR BASEURL><TMPL_VAR FAVICON>" type="image/x-icon" />
- +</TMPL_IF>
- +</head>
- +<body>
- +<TMPL_IF NAME="FAILED_SAVE">
- +<p>
- +<b>Failed to save your changes.</b>
- +</p>
- +<p>
- +Your changes were not able to be saved to disk. The system gave the error:
- +<blockquote>
- +<TMPL_VAR ERROR_MESSAGE>
- +</blockquote>
- +Your changes are preserved below, and you can try again to save them.
- +</p>
- +</TMPL_IF>
- +<TMPL_VAR FORM-START>
- +<div class="header">
- +<span><TMPL_VAR INDEXLINK>/ <TMPL_VAR FORM-TITLE></span>
- +</div>
- +<TMPL_VAR FIELD-DO>
- +<TMPL_VAR FIELD-FROM>
- +<TMPL_VAR FIELD-RCSINFO>
- +<TMPL_VAR FIELD-PAGE>
- +New location: <TMPL_VAR FIELD-NEWDIR>/ <TMPL_VAR FIELD-NEWNAME>
- +<br />
- +<TMPL_IF NAME="CAN_COMMIT">
- +Optional comment about this change:<br />
- +<TMPL_VAR FIELD-COMMENTS><br />
- +</TMPL_IF>
- +<input id="_submit" name="_submit" type="submit" value="Rename Page" /><input id="_submit_2" name="_submit" type="submit" value="Cancel" />
- +<TMPL_VAR FORM-END>
- +</body>
- +</html>
- diff -urNX ignorepats ikiwiki/templates/page.tmpl ikidev/templates/page.tmpl
- --- ikiwiki/templates/page.tmpl 2006-12-28 12:27:01.000000000 -0800
- +++ ikidev/templates/page.tmpl 2007-02-22 01:52:33.078464000 -0800
- @@ -32,6 +32,9 @@
- <TMPL_IF NAME="EDITURL">
- <li><a href="<TMPL_VAR EDITURL>">Edit</a></li>
- </TMPL_IF>
- +<TMPL_IF NAME="MOVEURL">
- +<li><a href="<TMPL_VAR MOVEURL>">Move</a></li>
- +</TMPL_IF>
- <TMPL_IF NAME="RECENTCHANGESURL">
- <li><a href="<TMPL_VAR RECENTCHANGESURL>">RecentChanges</a></li>
- </TMPL_IF>
-
-----
-
I'm going to try to run through a full analysis and design for moving and
deleting pages here. I want to make sure all cases are covered. --[[Joey]]
would be possible to code up a different rename button that doesn't do
that, and use it elsewhere.)
+Hmm, unless it saves the edit state and reloads it later, while using a separate
+form. Which seems to solve other problems, so I think is the way to go.
+
## SubPages
When renaming `foo`, it probably makes sense to also rename
`foo/Discussion`. Should other SubPages in `foo/` also be renamed? I think
it's probably simplest to rename all of its SubPages too.
+(For values of "simplest" that don't include the pain of dealing with all
+the changed links on subpages.. as well as issues like pagespecs that
+continue to match the old subpages, and cannot reasonably be auto-converted
+to use the new, etc, etc... So still undecided about this.)
+
When deleting `foo`, I don't think SubPages should be deleted. The
-potential for mistakes and abuse is too large.
+potential for mistakes and abuse is too large. Deleting Discussion page
+might be a useful exception.
+
+TODO: Currently, subpages are not addressed.
## link fixups
working. Rather than use redirection pages, I think that all pages that
link to it should be modified to fix their links.
+The rename plugin can add a "rename" hook, which other plugins can use to
+update links &etc. The hook would be passed page content, the old and new
+link names, and would modify the content and return it. At least the link
+plugin should have such a hook.
+
+After calling the "rename" hook, and rendering the wiki, the rename plugin
+can check to see what links remain pointing to the old page. There could
+still be some, for example, CamelCase links probably won't be changed; img
+plugins and others contain logical links to the file, etc. The user can be
+presented with a list of all the pages that still have links to the old
+page, and can manually deal with them.
+
In some cases, a redirection page will be wanted, to keep long-lived urls
working. Since the meta plugin supports creating such pages, and since they
won't always be needed, I think it will be simplest to just leave it up to
When renaming, the dest page must not already exist, and must be creatable
by the user, too.
-When deleting/renaming attachments, the `allowed_attachments` PageSpec
+lWhen deleting/renaming attachments, the `allowed_attachments` PageSpec
is checked too.
## RCS
-Two new optional functions are added to the RCS interface:
-
-* `rcs_delete(file, message, rcstoken, user, ipaddr)`
-* `rcs_rename(old, new, message, rcstoken, user, ipaddr)`
+Three new functions are added to the RCS interface:
-The page move/rename code will check if these are not available, and error
-out.
+* `rcs_remove(file)`
+* `rcs_rename(old, new)`
+* `rcs_commit_staged(message, user, ip)`
-Similar to `rcs_commit` both of these take a rcstoken, which is generated
-by an earlier `rcs_prepedit`.
+See [[rcs_updates_needed_for_rename_and_remove]].
## conflicts
-Cases that have to be dealt with:
+Cases to consider:
* Alice clicks "delete" button for a page; Bob makes a modification;
Alice confirms deletion. Ideally in this case, Alice should get an error
message that there's a conflict.
+ Update: In my current code, alice's deletion will fail if the file was
+ moved or deleted in the meantime; if the file was modified since alice
+ clicked on the delete button, the modifications will be deleted too. I
+ think this is acceptable.
* Alice opens edit UI for a page; Bob makes a modification; Alice
clicks delete button and confirms deletion. Again here, Alice should get
a conflict error. Note that this means that the rcstoken should be
recorded when the edit UI is first opened, not when the delete button is
hit.
+ Update: Again here, there's no conflict, but the delete succeeds. Again,
+ basically acceptible.
* Alice and Bob both try to delete a page at the same time. It's fine for
the second one to get a message that it no longer exists. Or just to
silently fail to delete the deleted page..
+ Update: It will display an error to the second one that the page doesn't
+ exist.
* Alice deletes a page; Bob had edit window open for it, and saves
it afterwards. I think that Bob should win in this case; Alice can always
notice the page has been added back, and delete it again.
+ Update: Bob wins.
* Alice clicks "rename" button for a page; Bob makes a modification;
Alice confirms rename. This case seems easy, it should just rename the
modified page.
+ Update: it does
* Alice opens edit UI for a page; Bob makes a modification; Alice
clicks rename button and confirms rename. Seems same as previous case.
+ Update: check
* Alice and Bob both try to rename a page at the same time (to probably
different names). Or one tries to delete, and the other to rename.
I think it's acceptible for the second one to get an error message that
the page no longer exists.
+ Update: check, that happens
* Alice renames a page; Bob had edit window open for it, and saves
it afterwards, under old name. I think it's acceptible for Bob to succeed
in saving it under the old name in this case, though not ideal.
-* Alice renames (or deletes) a page. In the meantime, Bob is uploading an
- attachment to it, and finishes after the rename finishes. Is it
- acceptible for the attachment to be saved under the old name?
+ Update: Behavior is the same as if Alice renamed the page and Bob created
+ a new page with the old name. Seems acceptable, though could be mildly
+ confusing to Bob (or Alice).
* Alice starts creating a new page. In the meantime, Bob renames a
different page to that name. Alice should get an error message when
committing; and it should have conflict markers. Ie, this should work the
same as if Bob had edited the new page at the same time as Alice did.
+ Update: That should happen. Haven't tested this case yet to make sure.
* Bob starts renaming a page. In the meantime, Alice creates a new page
with the name he's renaming it to. Here Bob should get a error message
that he can't rename the page to an existing name. (A conflict resolution
edit would also be ok.)
+ Update: Bob gets an error message.
+* Alice renames (or deletes) a page. In the meantime, Bob is uploading an
+ attachment to it, and finishes after the rename finishes. Is it
+ acceptible for the attachment to be saved under the old name?
+ Update: Meh. It's certianly not ideal; if Bob tries to save the page he
+ uploaded the attachment to, he'll get a message about it having been
+ deleted/renamed, and he can try to figure out what to do... :-/
+* I don't know if this is a conflict, but it is an important case to consider;
+ you need to make sure that there are no security holes. You dont want
+ someone to be able to rename something to <code>/etc/passwd</code>.
+ I think it would be enough that you cannot rename to a location outside
+ of srcdir, you cannot rename to a location that you wouldn't be able
+ to edit because it is locked, and you cannot rename to an existing page.
+
+ > Well, there are a few more cases (like not renaming to a pruned
+ > filename, and not renaming _from_ a file that is not a known source
+ > file or is locked), but yes, that's essentially it.
+ >
+ > PS, the first thing I do to any
+ > web form is type /etc/passwd and ../../../../etc/passwd into it. ;-) --[[Joey]]