+
+ # handle linkbacks; if a page has added/removed links, update the
+ # pages it links to
+ # TODO: inefficient; pages may get rendered above and again here;
+ # problem is the linkbacks could be wrong in the first pass render
+ # above
+ if (%rendered) {
+ my %linkchanged;
+ foreach my $file (keys %rendered, @del) {
+ my $page=pagename($file);
+ if (exists $links{$page}) {
+ foreach my $link (@{$links{$page}}) {
+ $link=bestlink($page, $link);
+ if (length $link &&
+ ! exists $oldlinks{$page} ||
+ ! grep { $_ eq $link } @{$oldlinks{$page}}) {
+ $linkchanged{$link}=1;
+ }
+ }
+ }
+ if (exists $oldlinks{$page}) {
+ foreach my $link (@{$oldlinks{$page}}) {
+ $link=bestlink($page, $link);
+ if (length $link &&
+ ! exists $links{$page} ||
+ ! grep { $_ eq $link } @{$links{$page}}) {
+ $linkchanged{$link}=1;
+ }
+ }
+ }
+ }
+ foreach my $link (keys %linkchanged) {
+ my $linkfile=$pagesources{$link};
+ if (defined $linkfile) {
+ debug("rendering $linkfile, to update its linkbacks");
+ render($linkfile);
+ }
+ }
+ }
+}
+
+# Generates a C wrapper program for running ikiwiki in a specific way.
+# The wrapper may be safely made suid.
+sub gen_wrapper ($$) {
+ my ($offline, $rebuild)=@_;
+
+ eval {use Cwd 'abs_path'};
+ $srcdir=abs_path($srcdir);
+ $destdir=abs_path($destdir);
+ my $this=abs_path($0);
+ if (! -x $this) {
+ error("$this doesn't seem to be executable");
+ }
+
+ my $call=qq{"$this", "$this", "$srcdir", "$destdir", "--wikiname=$wikiname"};
+ $call.=', "--verbose"' if $verbose;
+ $call.=', "--rebuild"' if $rebuild;
+ $call.=', "--offline"' if $offline;
+ $call.=', "--cgi"' if $cgi;
+ $call.=', "--url='.$url.'"' if $url;
+
+ # For CGI we need all these environment variables.
+ my @envsave=qw{REMOTE_ADDR QUERY_STRING REQUEST_METHOD REQUEST_URI
+ CONTENT_TYPE CONTENT_LENGTH GATEWAY_INTERFACE};
+ my $envsave="";
+ foreach my $var (@envsave) {
+ $envsave.=<<"EOF"
+ if ((s=getenv("$var")))
+ asprintf(&newenviron[i++], "%s=%s", "$var", s);
+EOF
+ }
+
+ open(OUT, ">ikiwiki-wrap.c") || error("failed to write ikiwiki-wrap.c: $!");;
+ print OUT <<"EOF";
+/* A wrapper for ikiwiki, can be safely made suid. */
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+extern char **environ;
+
+int main (void) {
+ /* Sanitize environment. */
+ if ($cgi) {
+ char *s;
+ char *newenviron[$#envsave+2];
+ int i=0;
+ $envsave;
+ newenviron[i]=NULL;
+ environ=newenviron;
+ }
+ else {
+ clearenv();
+ }
+
+ execl($call, NULL);
+ perror("failed to run $this");
+ exit(1);
+}
+EOF
+ close OUT;
+ if (system("gcc", "ikiwiki-wrap.c", "-o", "ikiwiki-wrap") != 0) {
+ error("failed to compile ikiwiki-wrap.c");
+ }
+ unlink("ikiwiki-wrap.c");
+ print "successfully generated ikiwiki-wrap\n";
+ exit 0;
+}
+
+sub cgi () {
+ eval q{use CGI};
+ my $q=CGI->new;
+
+ my $do=$q->param('do');
+ if (! defined $do || ! length $do) {
+ error("\"do\" parameter missing");
+ }
+
+ my ($page)=$q->param('page')=~/$wiki_file_regexp/; # untaint
+ if (! defined $page || ! length $page || $page ne $q->param('page') ||
+ $page=~/$wiki_file_prune_regexp/ || $page=~/^\//) {
+ error("bad page name");
+ }
+
+ my $action=$q->request_uri;
+ $action=~s/\?.*//;
+
+ if ($do eq 'edit') {
+ my $content="";
+ if (exists $pagesources{lc($page)}) {
+ $content=readfile("$srcdir/$pagesources{lc($page)}");
+ $content=~s/\n/\r\n/g;
+ }
+ $q->param("do", "save");
+ print $q->header,
+ $q->start_html("$wikiname: Editing $page"),
+ $q->h1("$wikiname: Editing $page"),
+ $q->start_form(-action => $action),
+ $q->hidden('do'),
+ $q->hidden('page'),
+ $q->textarea(-name => 'content',
+ -default => $content,
+ -rows => 20,
+ -columns => 80),
+ $q->p,
+ $q->submit("Save Changes"),
+ # TODO: Cancel button returns to page.
+ # TODO: Preview button.
+ # TODO: Commit message field.
+ # TODO: Conflict prevention.
+ $q->end_form,
+ $q->end_html;
+ }
+ elsif ($do eq 'save') {
+ my $file=$page.$default_pagetype;
+ if (exists $pagesources{lc($page)}) {
+ $file=$pagesources{lc($page)};
+ }
+
+ my $content=$q->param('content');
+ $content=~s/\r\n/\n/g;
+ $content=~s/\r/\n/g;
+ writefile("$srcdir/$file", $content);
+
+ print $q->redirect("$url/".htmlpage($page));
+ }
+ else {
+ error("unknown do parameter");
+ }
+}
+
+my $rebuild=0;
+my $offline=0;
+my $wrapper=0;
+if (grep /^-/, @ARGV) {
+ eval {use Getopt::Long};
+ GetOptions(
+ "wikiname=s" => \$wikiname,
+ "verbose|v" => \$verbose,
+ "rebuild" => \$rebuild,
+ "wrapper" => \$wrapper,
+ "offline" => \$offline,
+ "cgi" => \$cgi,
+ "url=s" => \$url,
+ ) || usage();
+}
+usage() unless @ARGV == 2;
+($srcdir) = possibly_foolish_untaint(shift);
+($destdir) = possibly_foolish_untaint(shift);
+
+if ($cgi && ! length $url) {
+ error("Must specify url to wiki with --url when using --cgi");