the pre-receive wrapper needs to be suid after all
[ikiwiki.git] / IkiWiki / Plugin / git.pm
index 1facb14c0076f7c17eb5734727f8cfb9930cf02c..5bef92856efa31e5693d67ba7207622da5d17171 100644 (file)
@@ -9,6 +9,7 @@ use open qw{:utf8 :std};
 
 my $sha1_pattern     = qr/[0-9a-fA-F]{40}/; # pattern to validate Git sha1sums
 my $dummy_commit_msg = 'dummy commit';      # message to skip in recent changes
 
 my $sha1_pattern     = qr/[0-9a-fA-F]{40}/; # pattern to validate Git sha1sums
 my $dummy_commit_msg = 'dummy commit';      # message to skip in recent changes
+my $no_chdir=0;
 
 sub import { #{{{
        hook(type => "checkconfig", id => "git", call => \&checkconfig);
 
 sub import { #{{{
        hook(type => "checkconfig", id => "git", call => \&checkconfig);
@@ -23,7 +24,7 @@ sub import { #{{{
        hook(type => "rcs", id => "rcs_recentchanges", call => \&rcs_recentchanges);
        hook(type => "rcs", id => "rcs_diff", call => \&rcs_diff);
        hook(type => "rcs", id => "rcs_getctime", call => \&rcs_getctime);
        hook(type => "rcs", id => "rcs_recentchanges", call => \&rcs_recentchanges);
        hook(type => "rcs", id => "rcs_diff", call => \&rcs_diff);
        hook(type => "rcs", id => "rcs_getctime", call => \&rcs_getctime);
-       hook(type => "rcs", id => "rcs_test_receive", call => \&rcs_test_receive);
+       hook(type => "rcs", id => "rcs_receive", call => \&rcs_receive);
 } #}}}
 
 sub checkconfig () { #{{{
 } #}}}
 
 sub checkconfig () { #{{{
@@ -45,7 +46,7 @@ sub checkconfig () { #{{{
                push @{$config{wrappers}}, {
                        test_receive => 1,
                        wrapper => $config{git_test_receive_wrapper},
                push @{$config{wrappers}}, {
                        test_receive => 1,
                        wrapper => $config{git_test_receive_wrapper},
-                       wrappermode => "0755",
+                       wrappermode => (defined $config{git_wrappermode} ? $config{git_wrappermode} : "06755"),
                };
        }
 } #}}}
                };
        }
 } #}}}
@@ -77,7 +78,7 @@ sub getsetup () { #{{{
                        safe => 0, # file
                        rebuild => 0,
                },
                        safe => 0, # file
                        rebuild => 0,
                },
-               git_untrusted_committers => {
+               untrusted_committers => {
                        type => "string",
                        example => [],
                        description => "unix users whose commits should be checked by the pre-receive hook",
                        type => "string",
                        example => [],
                        description => "unix users whose commits should be checked by the pre-receive hook",
@@ -127,8 +128,10 @@ sub safe_git (&@) { #{{{
        if (!$pid) {
                # In child.
                # Git commands want to be in wc.
        if (!$pid) {
                # In child.
                # Git commands want to be in wc.
-               chdir $config{srcdir}
-                   or error("Cannot chdir to $config{srcdir}: $!");
+               if (! $no_chdir) {
+                       chdir $config{srcdir}
+                           or error("Cannot chdir to $config{srcdir}: $!");
+               }
                exec @cmdline or error("Cannot exec '@cmdline': $!");
        }
        # In parent.
                exec @cmdline or error("Cannot exec '@cmdline': $!");
        }
        # In parent.
@@ -362,8 +365,10 @@ sub git_commit_info ($;$) { #{{{
        # starting from the given sha1sum.
        my ($sha1, $num) = @_;
 
        # starting from the given sha1sum.
        my ($sha1, $num) = @_;
 
-       my @raw_lines = run_or_die('git', 'log',
-               (defined $num ? "--max-count=$num" : ""), 
+       my @opts;
+       push @opts, "--max-count=$num" if defined $num;
+
+       my @raw_lines = run_or_die('git', 'log', @opts,
                '--pretty=raw', '--raw', '--abbrev=40', '--always', '-c',
                '-r', $sha1, '--', '.');
        my ($prefix) = run_or_die('git', 'rev-parse', '--show-prefix');
                '--pretty=raw', '--raw', '--abbrev=40', '--always', '-c',
                '-r', $sha1, '--', '.');
        my ($prefix) = run_or_die('git', 'rev-parse', '--show-prefix');
@@ -588,15 +593,7 @@ sub rcs_getctime ($) { #{{{
        return $ctime;
 } #}}}
 
        return $ctime;
 } #}}}
 
-sub rcs_test_receive () { #{{{
-       # quick success if the user is trusted
-       my $committer=(getpwuid($<))[0];
-       if (! defined $committer) {
-               error("cannot determine username for $<");
-       }
-       exit 0 if ! ref $config{git_untrusted_committers} ||
-                 ! grep { $_ eq $committer } @{$config{git_untrusted_committers}};
-
+sub rcs_receive () { #{{{
        # The wiki may not be the only thing in the git repo.
        # Determine if it is in a subdirectory by examining the srcdir,
        # and its parents, looking for the .git directory.
        # The wiki may not be the only thing in the git repo.
        # Determine if it is in a subdirectory by examining the srcdir,
        # and its parents, looking for the .git directory.
@@ -610,54 +607,83 @@ sub rcs_test_receive () { #{{{
                }
        }
 
                }
        }
 
-       my @errors;
+       my @rets;
        while (<>) {
                chomp;
                my ($oldrev, $newrev, $refname) = split(' ', $_, 3);
        while (<>) {
                chomp;
                my ($oldrev, $newrev, $refname) = split(' ', $_, 3);
-
+               
                # only allow changes to gitmaster_branch
                if ($refname !~ /^refs\/heads\/\Q$config{gitmaster_branch}\E$/) {
                # only allow changes to gitmaster_branch
                if ($refname !~ /^refs\/heads\/\Q$config{gitmaster_branch}\E$/) {
-                       push @errors, sprintf(gettext("you are not allowed to change %s"), $refname);
+                       error sprintf(gettext("you are not allowed to change %s"), $refname);
                }
                }
-
-               foreach my $ci (git_commit_info($oldrev."..".$newrev)) {
+               
+               # Avoid chdir when running git here, because the changes
+               # are in the master git repo, not the srcdir repo.
+               # The pre-recieve hook already puts us in the right place.
+               $no_chdir=1;
+               my @changes=git_commit_info($oldrev."..".$newrev);
+               $no_chdir=0;
+
+               foreach my $ci (@changes) {
                        foreach my $detail (@{ $ci->{'details'} }) {
                                my $file = $detail->{'file'};
 
                        foreach my $detail (@{ $ci->{'details'} }) {
                                my $file = $detail->{'file'};
 
-                               # check that all changed files are in the subdir
+                               # check that all changed files are in the
+                               # subdir
                                if (length $subdir &&
                                    ! ($file =~ s/^\Q$subdir\E//)) {
                                if (length $subdir &&
                                    ! ($file =~ s/^\Q$subdir\E//)) {
-                                       push @errors, sprintf(gettext("you are not allowed to change %s"), $file);
-                                       next;
+                                       error sprintf(gettext("you are not allowed to change %s"), $file);
                                }
 
                                }
 
-                               if ($detail->{'mode_from'} ne $detail->{'mode_to'}) {
-                                       push @errors, gettext("you are not allowed to change file modes");
+                               my ($action, $mode, $path);
+                               if ($detail->{'status'} =~ /^[M]+\d*$/) {
+                                       $action="change";
+                                       $mode=$detail->{'mode_to'};
                                }
                                }
-
-                               if ($detail->{'status'} =~ /^D+\d*/) {
-                                       # TODO check_canremove
+                               elsif ($detail->{'status'} =~ /^[AM]+\d*$/) {
+                                       $action="add";
+                                       $mode=$detail->{'mode_to'};
                                }
                                }
-                               elsif ($detail->{'status'} !~ /^[MA]+\d*$/) {
-                                       push @errors, "unknown status ".$detail->{'status'};
+                               elsif ($detail->{'status'} =~ /^[DAM]+\d*/) {
+                                       $action="remove";
+                                       $mode=$detail->{'mode_from'};
                                }
                                else {
                                }
                                else {
-                                       # TODO check_canedit
-                                       # TODO check_canattach
+                                       error "unknown status ".$detail->{'status'};
+                               }
+                               
+                               # test that the file mode is ok
+                               if ($mode !~ /^100[64][64][64]$/) {
+                                       error sprintf(gettext("you cannot act on a file with mode %s"), $mode);
+                               }
+                               if ($action eq "change") {
+                                       if ($detail->{'mode_from'} ne $detail->{'mode_to'}) {
+                                               error gettext("you are not allowed to change file modes");
+                                       }
                                }
                                }
+                               
+                               # extract attachment to temp file
+                               if (($action eq 'add' || $action eq 'change') &&
+                                    ! pagetype($file)) {
+                                       eval q{use File::Temp};
+                                       die $@ if $@;
+                                       my $fh;
+                                       ($fh, $path)=File::Temp::tempfile("XXXXXXXXXX", UNLINK => 1);
+                                       if (system("git show ".$detail->{sha1_to}." > '$path'") != 0) {
+                                               error("failed writing temp file");
+                                       }
+                               }
+
+                               push @rets, {
+                                       file => $file,
+                                       action => $action,
+                                       path => $path,
+                               };
                        }
                }
        }
 
                        }
                }
        }
 
-       if (@errors) {
-               # TODO clean up objects from failed push
-
-               print STDERR "$_\n" foreach @errors;
-               exit 1;
-       }
-       else {
-               exit 0;
-       }
+       return reverse @rets;
 } #}}}
 
 1
 } #}}}
 
 1