Merge branch 'master' of ssh://git.ikiwiki.info/srv/git/ikiwiki.info

[ikiwiki.git] / IkiWiki / Wrapper.pm

diff --git a/IkiWiki/Wrapper.pm b/IkiWiki/Wrapper.pm
index eb6228dc314dd2b24d6740f34e08c8f73e437512..6555fe625f8e542e786f3b6d7d05a72772ea207f 100644 (file)
--- a/IkiWiki/Wrapper.pm
+++ b/IkiWiki/Wrapper.pm
@@ -8,7 +8,7 @@ use File::Spec;
 use Data::Dumper;
 use IkiWiki;
 
-sub gen_wrapper () { #{{{
+sub gen_wrapper () {
        $config{srcdir}=File::Spec->rel2abs($config{srcdir});
        $config{destdir}=File::Spec->rel2abs($config{destdir});
        my $this=File::Spec->rel2abs($0);
@@ -28,31 +28,81 @@ 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 HTTPS} if $config{cgi};
+                      HTTP_COOKIE REMOTE_USER HTTPS REDIRECT_STATUS
+                      REDIRECT_URL} if $config{cgi};
        my $envsave="";
        foreach my $var (@envsave) {
-               $envsave.=<<"EOF"
+               $envsave.=<<"EOF";
        if ((s=getenv("$var")))
                addenv("$var", s);
 EOF
        }
-       
+
+       my $test_receive="";
+       if ($config{test_receive}) {
+               require IkiWiki::Receive;
+               $test_receive=IkiWiki::Receive::gen_wrapper();
+       }
+
+       my $check_commit_hook="";
+       my $pre_exec="";
+       if ($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, 0666);
+               if (fd != -1) {
+                       if (flock(fd, LOCK_SH | LOCK_NB) != 0)
+                               exit(0);
+                       close(fd);
+               }
+       }
+EOF
+       }
+       elsif ($config{cgi}) {
+               # Avoid more than one ikiwiki cgi running at a time by
+               # taking a cgi lock. Since ikiwiki uses several MB of
+               # memory, a pile up of processes could cause thrashing
+               # otherwise. The fd of the lock is stored in
+               # IKIWIKI_CGILOCK_FD so unlockwiki can close it.
+               $pre_exec=<<"EOF";
+       {
+               int fd=open("$config{wikistatedir}/cgilock", O_CREAT | O_RDWR, 0666);
+               if (fd != -1 && flock(fd, LOCK_EX) == 0) {
+                       char *fd_s;
+                       asprintf(&fd_s, "%i", fd);
+                       setenv("IKIWIKI_CGILOCK_FD", fd_s, 1);
+               }
+       }
+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;
        
-       #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", $!));;
-       print OUT <<"EOF";
+       writefile(basename("$wrapper.c"), dirname($wrapper), <<"EOF");
 /* A wrapper for ikiwiki, can be safely made suid. */
 #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];
@@ -67,12 +117,13 @@ addenv(char *var, char *val) {
 }
 
 int main (int argc, char **argv) {
-       /* Sanitize environment. */
        char *s;
+
+$check_commit_hook
+$test_receive
 $envsave
        newenviron[i++]="HOME=$ENV{HOME}";
        newenviron[i++]="WRAPPED_OPTIONS=$configstring";
-       asprintf(newenviron[i++], "CALLER_UID=%i", getuid());
        newenviron[i]=NULL;
        environ=newenviron;
 
@@ -87,6 +138,7 @@ $envsave
                exit(1);
        }
 
+$pre_exec
        execl("$this", "$this", NULL);
        perror("exec $this");
        exit(1);
@@ -119,6 +171,6 @@ EOF
        #translators: The parameter is a filename.
        printf(gettext("successfully generated %s"), $wrapper);
        print "\n";
-} #}}}
+}
 
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