X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/49d63e7a5530afad04b5cac0d41ca594d9580215..06c23490d9f2fd616da06f0b3c260a61531fe9a7:/IkiWiki/Wrapper.pm

diff --git a/IkiWiki/Wrapper.pm b/IkiWiki/Wrapper.pm
index 8c363cc11..99237d3b5 100644
--- a/IkiWiki/Wrapper.pm
+++ b/IkiWiki/Wrapper.pm
@@ -1,17 +1,17 @@
 #!/usr/bin/perl
 
+package IkiWiki;
+
 use warnings;
 use strict;
-use Cwd q{abs_path};
+use File::Spec;
 use Data::Dumper;
 use IkiWiki;
 
-package IkiWiki;
-
 sub gen_wrapper () { #{{{
-	$config{srcdir}=abs_path($config{srcdir});
-	$config{destdir}=abs_path($config{destdir});
-	my $this=abs_path($0);
+	$config{srcdir}=File::Spec->rel2abs($config{srcdir});
+	$config{destdir}=File::Spec->rel2abs($config{destdir});
+	my $this=File::Spec->rel2abs($0);
 	if (! -x $this) {
 		error(sprintf(gettext("%s doesn't seem to be executable"), $this));
 	}
@@ -28,81 +28,128 @@ sub gen_wrapper () { #{{{
 	my @envsave;
 	push @envsave, qw{REMOTE_ADDR QUERY_STRING REQUEST_METHOD REQUEST_URI
 	               CONTENT_TYPE CONTENT_LENGTH GATEWAY_INTERFACE
-		       HTTP_COOKIE REMOTE_USER} if $config{cgi};
+		       HTTP_COOKIE REMOTE_USER HTTPS} if $config{cgi};
 	my $envsave="";
 	foreach my $var (@envsave) {
-		$envsave.=<<"EOF"
+		$envsave.=<<"EOF";
 	if ((s=getenv("$var")))
-		asprintf(&newenviron[i++], "%s=%s", "$var", s);
+		addenv("$var", s);
 EOF
 	}
-	if ($config{rcs} eq "svn" && $config{notify}) {
-		# Support running directly as hooks/post-commit by passing
-		# $2 in REV in the environment.
-		$envsave.=<<"EOF"
-	if (argc == 3)
-		asprintf(&newenviron[i++], "REV=%s", argv[2]);
-	else if ((s=getenv("REV")))
-		asprintf(&newenviron[i++], "%s=%s", "REV", s);
-EOF
+
+	my $test_receive="";
+	if ($config{test_receive}) {
+		require IkiWiki::Receive;
+		$test_receive=IkiWiki::Receive::gen_wrapper();
+	}
+
+	my $check_commit_hook="";
+	if ($config{post_commit}) {
+		# Optimise checking !commit_hook_enabled() , 
+		# so that ikiwiki does not have to be started if the
+		# hook is disabled.
+		#
+		# Note that perl's flock may be implemented using fcntl
+		# or lockf on some systems. If so, and if there is no
+		# interop between the locking systems, the true C flock will
+		# always succeed, and this optimisation won't work.
+		# The perl code will later correctly check the lock,
+		# so the right thing will still happen, though without
+		# the benefit of this optimisation.
+		$check_commit_hook=<<"EOF";
+	{
+		int fd=open("$config{wikistatedir}/commitlock", O_CREAT | O_RDWR);
+		if (fd != -1) {
+			if (flock(fd, LOCK_SH | LOCK_NB) != 0)
+				exit(0);
+			close(fd);
+		}
 	}
-	if ($config{rcs} eq "tla" && $config{notify}) {
-		$envsave.=<<"EOF"
-	if ((s=getenv("ARCH_VERSION")))
-		asprintf(&newenviron[i++], "%s=%s", "ARCH_VERSION", s);
 EOF
 	}
-	
+
 	$Data::Dumper::Indent=0; # no newlines
 	my $configstring=Data::Dumper->Dump([\%config], ['*config']);
 	$configstring=~s/\\/\\\\/g;
 	$configstring=~s/"/\\"/g;
-	$configstring=~s/\n/\\\n/g;
+	$configstring=~s/\n/\\n/g;
 	
 	#translators: The first parameter is a filename, and the second is
 	#translators: a (probably not translated) error message.
 	open(OUT, ">$wrapper.c") || error(sprintf(gettext("failed to write %s: %s"), "$wrapper.c", $!));;
 	print OUT <<"EOF";
 /* A wrapper for ikiwiki, can be safely made suid. */
-#define _GNU_SOURCE
 #include <stdio.h>
 #include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/file.h>
 
 extern char **environ;
+char *newenviron[$#envsave+6];
+int i=0;
+
+addenv(char *var, char *val) {
+	char *s=malloc(strlen(var)+1+strlen(val)+1);
+	if (!s)
+		perror("malloc");
+	sprintf(s, "%s=%s", var, val);
+	newenviron[i++]=s;
+}
 
 int main (int argc, char **argv) {
-	/* Sanitize environment. */
 	char *s;
-	char *newenviron[$#envsave+5];
-	int i=0;
+
+$check_commit_hook
+$test_receive
 $envsave
 	newenviron[i++]="HOME=$ENV{HOME}";
 	newenviron[i++]="WRAPPED_OPTIONS=$configstring";
 	newenviron[i]=NULL;
 	environ=newenviron;
 
-	if (setregid(getegid(), -1) != 0 || setreuid(geteuid(), -1) != 0) {
-		perror("failed to drop real uid/gid");
+	if (setregid(getegid(), -1) != 0 &&
+	    setregid(getegid(), -1) != 0) {
+		perror("failed to drop real gid");
+		exit(1);
+	}
+	if (setreuid(geteuid(), -1) != 0 &&
+	    setreuid(geteuid(), -1) != 0) {
+		perror("failed to drop real uid");
 		exit(1);
 	}
 
 	execl("$this", "$this", NULL);
-	perror("failed to run $this");
+	perror("exec $this");
 	exit(1);
 }
 EOF
 	close OUT;
-	if (system("gcc", "$wrapper.c", "-o", $wrapper) != 0) {
+
+	my $cc=exists $ENV{CC} ? possibly_foolish_untaint($ENV{CC}) : 'cc';
+	if (system($cc, "$wrapper.c", "-o", "$wrapper.new") != 0) {
 		#translators: The parameter is a C filename.
 		error(sprintf(gettext("failed to compile %s"), "$wrapper.c"));
 	}
 	unlink("$wrapper.c");
+	if (defined $config{wrappergroup}) {
+		my $gid=(getgrnam($config{wrappergroup}))[2];
+		if (! defined $gid) {
+			error(sprintf("bad wrappergroup"));
+		}
+		if (! chown(-1, $gid, "$wrapper.new")) {
+			error("chown $wrapper.new: $!");
+		}
+	}
 	if (defined $config{wrappermode} &&
-	    ! chmod(oct($config{wrappermode}), $wrapper)) {
-		error("chmod $wrapper: $!");
+	    ! chmod(oct($config{wrappermode}), "$wrapper.new")) {
+		error("chmod $wrapper.new: $!");
+	}
+	if (! rename("$wrapper.new", $wrapper)) {
+		error("rename $wrapper.new $wrapper: $!");
 	}
 	#translators: The parameter is a filename.
 	printf(gettext("successfully generated %s"), $wrapper);