Getopt::Long is a huge, heavy perl module. So why use it?

This {gross,amazing} hack makes all wrapped uses of ikiwiki forgo any
option parsing at all. Options come in preparses via an env var from the
wrapper. As a bonus, Wrapper.pm no longer needs to be updated when command
line options are added to the program. Load time is sped up by around 10%.

ikiwikiwrap --params is no longer supported by this change. You will need
to rebuild your wrappers to take advantage of it.

IkiWiki/Wrapper.pm

@@ -2,11 +2,12 @@
 
 use warnings;
 use strict;
+use Cwd q{abs_path};
+use Data::Dumper;
 
 package IkiWiki;
 
 sub gen_wrapper () { #{{{
-	eval q{use Cwd 'abs_path'};
 	$config{srcdir}=abs_path($config{srcdir});
 	$config{destdir}=abs_path($config{destdir});
 	my $this=abs_path($0);
@@ -17,26 +18,8 @@ sub gen_wrapper () { #{{{
 	if ($config{setup}) {
 		error("cannot create a wrapper that uses a setup file");
 	}
-	
-	my @params=($config{srcdir}, $config{destdir},
-		"--wikiname=$config{wikiname}",
-		"--templatedir=$config{templatedir}");
-	push @params, "--verbose" if $config{verbose};
-	push @params, "--rebuild" if $config{rebuild};
-	push @params, "--nosvn" if !$config{svn};
-	push @params, "--cgi" if $config{cgi};
-	push @params, "--url=$config{url}" if length $config{url};
-	push @params, "--cgiurl=$config{cgiurl}" if length $config{cgiurl};
-	push @params, "--historyurl=$config{historyurl}" if length $config{historyurl};
-	push @params, "--diffurl=$config{diffurl}" if length $config{diffurl};
-	push @params, "--anonok" if $config{anonok};
-	push @params, "--adminuser=$_" foreach @{$config{adminuser}};
-	my $params=join(" ", @params);
-	my $call='';
-	foreach my $p ($this, $this, @params) {
-		$call.=qq{"$p", };
-	}
-	$call.="NULL";
+	my $wrapper=possibly_foolish_untaint($config{wrapper});
+	delete $config{wrapper};
 	
 	my @envsave;
 	push @envsave, qw{REMOTE_ADDR QUERY_STRING REQUEST_METHOD REQUEST_URI
@@ -50,6 +33,11 @@ sub gen_wrapper () { #{{{
 EOF
 	}
 	
+	$Data::Dumper::Indent=0;
+	my $configstring=Data::Dumper->Dump([\%config], ['*config']);
+	$configstring=~s/\\/\\\\/g;
+	$configstring=~s/"/\\"/g;
+	
 	open(OUT, ">ikiwiki-wrap.c") || error("failed to write ikiwiki-wrap.c: $!");;
 	print OUT <<"EOF";
 /* A wrapper for ikiwiki, can be safely made suid. */
@@ -64,33 +52,29 @@ extern char **environ;
 int main (int argc, char **argv) {
 	/* Sanitize environment. */
 	char *s;
-	char *newenviron[$#envsave+3];
+	char *newenviron[$#envsave+4];
 	int i=0;
 $envsave
 	newenviron[i++]="HOME=$ENV{HOME}";
+	newenviron[i++]="WRAPPED_OPTIONS=$configstring";
 	newenviron[i]=NULL;
 	environ=newenviron;
 
-	if (argc == 2 && strcmp(argv[1], "--params") == 0) {
-		printf("$params\\n");
-		exit(0);
-	}
-	
-	execl($call);
+	execl("$this", "$this", NULL);
 	perror("failed to run $this");
 	exit(1);
 }
 EOF
 	close OUT;
-	if (system("gcc", "ikiwiki-wrap.c", "-o", possibly_foolish_untaint($config{wrapper})) != 0) {
+	if (system("gcc", "ikiwiki-wrap.c", "-o", $wrapper) != 0) {
 		error("failed to compile ikiwiki-wrap.c");
 	}
 	unlink("ikiwiki-wrap.c");
 	if (defined $config{wrappermode} &&
-	    ! chmod(oct($config{wrappermode}), possibly_foolish_untaint($config{wrapper}))) {
-		error("chmod $config{wrapper}: $!");
+	    ! chmod(oct($config{wrappermode}), $wrapper)) {
+		error("chmod $wrapper: $!");
 	}
-	print "successfully generated $config{wrapper}\n";
+	print "successfully generated $wrapper\n";
 } #}}}
 
 1

doc/usage.mdwn

@@ -44,9 +44,7 @@ flags such as --verbose can be negated with --no-verbose.
   The wrapper is designed to be safely made suid and be run by untrusted
   users, as a [[Subversion]] [[post-commit]] hook, or as a [[CGI]].
 
-  Note that the generated wrapper will ignore all command line parameters
-  except for --params, which will make it print out the parameters it would
-  run ikiwiki with.
+  Note that the generated wrapper will ignore all command line parameters.
 
 * --wrappermode mode
 

doc/wrapperparamstrick.mdwn

@@ -1,20 +0,0 @@
-ikiwiki --wrapper can be used to generate a wrapper
-program that runs ikiwiki with the specified parameters. This is used for
-[[post-commit]] hooks, [[CGI]], etc, both for convenience and because these
-things often need suid wrapper scripts to make ikiwiki run as the right
-user.
-
-The generated wrapper is a binary program. What if you want to regenerate
-it with different parameters, or just run ikiwiki like it would but with
-some parameter changed? To easily accomomplish this, the wrappers all
-support being run with --params, which causes them to print out the
-parameters they run ikiwiki with. 
-
-You can use this trick to regenerate a wrapper, adding or changing a
-parameter:
-
-	ikiwiki $(./ikiwiki-wrap --params) --wikiname="newname" --wrapper
-
-Or just to run ikiwiki like the wrapper would, and add a parameter:
-
-	ikiwiki $(./ikiwiki-wrap --params) --rebuild

ikiwiki

@@ -10,7 +10,6 @@ use strict;
 use Memoize;
 use File::Spec;
 use HTML::Template;
-use Getopt::Long;
 
 use vars qw{%config %links %oldlinks %oldpagemtime %renderedfiles %pagesources};
 
@@ -39,7 +38,10 @@ our %config=( #{{{
 	adminuser => undef,
 ); #}}}
 
-GetOptions( #{{{
+# option parsing #{{{
+if (! exists $ENV{WRAPPED_OPTIONS}) {
+	eval q{use Getopt::Long};
+	GetOptions(
 		"setup|s=s" => \$config{setup},
 		"wikiname=s" => \$config{wikiname},
 		"verbose|v!" => \$config{verbose},
@@ -66,6 +68,13 @@ if (! $config{setup}) {
 		$config{destdir} = possibly_foolish_untaint(shift);
 		checkoptions();
 	}
+}
+else {
+	# wrapper passes a full config structure in the environment
+	# variable
+	eval possibly_foolish_untaint($ENV{WRAPPED_OPTIONS});
+	checkoptions();
+}
 #}}}
 
 sub checkoptions { #{{{