ikiwiki/IkiWiki/Plugin/git.pm

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#!/usr/bin/perl
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package IkiWiki::Plugin::git;
use warnings;
use strict;
use IkiWiki;
use Encode;
use open qw{:utf8 :std};
my $sha1_pattern = qr/[0-9a-fA-F]{40}/; # pattern to validate Git sha1sums
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my $dummy_commit_msg = 'dummy commit'; # message to skip in recent changes
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my $no_chdir=0;
sub import {
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hook(type => "checkconfig", id => "git", call => \&checkconfig);
hook(type => "getsetup", id => "git", call => \&getsetup);
hook(type => "genwrapper", id => "git", call => \&genwrapper);
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hook(type => "rcs", id => "rcs_update", call => \&rcs_update);
hook(type => "rcs", id => "rcs_prepedit", call => \&rcs_prepedit);
hook(type => "rcs", id => "rcs_commit", call => \&rcs_commit);
hook(type => "rcs", id => "rcs_commit_staged", call => \&rcs_commit_staged);
hook(type => "rcs", id => "rcs_add", call => \&rcs_add);
hook(type => "rcs", id => "rcs_remove", call => \&rcs_remove);
hook(type => "rcs", id => "rcs_rename", call => \&rcs_rename);
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_getmtime", call => \&rcs_getmtime);
hook(type => "rcs", id => "rcs_receive", call => \&rcs_receive);
}
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sub checkconfig () {
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if (! defined $config{gitorigin_branch}) {
$config{gitorigin_branch}="origin";
}
if (! defined $config{gitmaster_branch}) {
$config{gitmaster_branch}="master";
}
if (defined $config{git_wrapper} &&
length $config{git_wrapper}) {
push @{$config{wrappers}}, {
wrapper => $config{git_wrapper},
wrappermode => (defined $config{git_wrappermode} ? $config{git_wrappermode} : "06755"),
wrapper_background_command => $config{git_wrapper_background_command},
};
}
if (defined $config{git_test_receive_wrapper} &&
length $config{git_test_receive_wrapper} &&
defined $config{untrusted_committers} &&
@{$config{untrusted_committers}}) {
push @{$config{wrappers}}, {
test_receive => 1,
wrapper => $config{git_test_receive_wrapper},
wrappermode => (defined $config{git_wrappermode} ? $config{git_wrappermode} : "06755"),
};
}
# Avoid notes, parser does not handle and they only slow things down.
$ENV{GIT_NOTES_REF}="";
# Run receive test only if being called by the wrapper, and not
# when generating same.
if ($config{test_receive} && ! exists $config{wrapper}) {
require IkiWiki::Receive;
IkiWiki::Receive::test();
}
}
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sub getsetup () {
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return
plugin => {
safe => 0, # rcs plugin
rebuild => undef,
section => "rcs",
},
git_wrapper => {
type => "string",
example => "/git/wiki.git/hooks/post-update",
description => "git hook to generate",
safe => 0, # file
rebuild => 0,
},
git_wrapper_background_command => {
type => "string",
example => "git push github",
description => "shell command for git_wrapper to run, in the background",
safe => 0, # command
rebuild => 0,
},
git_wrappermode => {
type => "string",
example => '06755',
description => "mode for git_wrapper (can safely be made suid)",
safe => 0,
rebuild => 0,
},
git_test_receive_wrapper => {
type => "string",
example => "/git/wiki.git/hooks/pre-receive",
description => "git pre-receive hook to generate",
safe => 0, # file
rebuild => 0,
},
untrusted_committers => {
type => "string",
example => [],
description => "unix users whose commits should be checked by the pre-receive hook",
safe => 0,
rebuild => 0,
},
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historyurl => {
type => "string",
example => "http://git.example.com/gitweb.cgi?p=wiki.git;a=history;f=[[file]];hb=HEAD",
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description => "gitweb url to show file history ([[file]] substituted)",
safe => 1,
rebuild => 1,
},
diffurl => {
type => "string",
example => "http://git.example.com/gitweb.cgi?p=wiki.git;a=blobdiff;f=[[file]];h=[[sha1_to]];hp=[[sha1_from]];hb=[[sha1_commit]];hpb=[[sha1_parent]]",
description => "gitweb url to show a diff ([[file]], [[sha1_to]], [[sha1_from]], [[sha1_commit]], and [[sha1_parent]] substituted)",
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safe => 1,
rebuild => 1,
},
gitorigin_branch => {
type => "string",
example => "origin",
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description => "where to pull and push changes (set to empty string to disable)",
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safe => 0, # paranoia
rebuild => 0,
},
gitmaster_branch => {
type => "string",
example => "master",
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description => "branch that the wiki is stored in",
safe => 0, # paranoia
rebuild => 0,
},
}
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sub genwrapper {
if ($config{test_receive}) {
require IkiWiki::Receive;
return IkiWiki::Receive::genwrapper();
}
else {
return "";
}
}
sub safe_git (&@) {
# Start a child process safely without resorting /bin/sh.
# Return command output or success state (in scalar context).
my ($error_handler, @cmdline) = @_;
my $pid = open my $OUT, "-|";
error("Cannot fork: $!") if !defined $pid;
if (!$pid) {
# In child.
# Git commands want to be in wc.
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if (! $no_chdir) {
chdir $config{srcdir}
or error("Cannot chdir to $config{srcdir}: $!");
}
exec @cmdline or error("Cannot exec '@cmdline': $!");
}
# In parent.
# git output is probably utf-8 encoded, but may contain
# other encodings or invalidly encoded stuff. So do not rely
# on the normal utf-8 IO layer, decode it by hand.
binmode($OUT);
my @lines;
while (<$OUT>) {
$_=decode_utf8($_, 0);
chomp;
push @lines, $_;
}
close $OUT;
$error_handler->("'@cmdline' failed: $!") if $? && $error_handler;
return wantarray ? @lines : ($? == 0);
}
# Convenient wrappers.
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sub run_or_die ($@) { safe_git(\&error, @_) }
sub run_or_cry ($@) { safe_git(sub { warn @_ }, @_) }
sub run_or_non ($@) { safe_git(undef, @_) }
sub merge_past ($$$) {
# Unlike with Subversion, Git cannot make a 'svn merge -rN:M file'.
# Git merge commands work with the committed changes, except in the
# implicit case of '-m' of git checkout(1). So we should invent a
# kludge here. In principle, we need to create a throw-away branch
# in preparing for the merge itself. Since branches are cheap (and
# branching is fast), this shouldn't cost high.
#
# The main problem is the presence of _uncommitted_ local changes. One
# possible approach to get rid of this situation could be that we first
# make a temporary commit in the master branch and later restore the
# initial state (this is possible since Git has the ability to undo a
# commit, i.e. 'git reset --soft HEAD^'). The method can be summarized
# as follows:
#
# - create a diff of HEAD:current-sha1
# - dummy commit
# - create a dummy branch and switch to it
# - rewind to past (reset --hard to the current-sha1)
# - apply the diff and commit
# - switch to master and do the merge with the dummy branch
# - make a soft reset (undo the last commit of master)
#
# The above method has some drawbacks: (1) it needs a redundant commit
# just to get rid of local changes, (2) somewhat slow because of the
# required system forks. Until someone points a more straight method
# (which I would be grateful) I have implemented an alternative method.
# In this approach, we hide all the modified files from Git by renaming
# them (using the 'rename' builtin) and later restore those files in
# the throw-away branch (that is, we put the files themselves instead
# of applying a patch).
my ($sha1, $file, $message) = @_;
my @undo; # undo stack for cleanup in case of an error
my $conflict; # file content with conflict markers
eval {
# Hide local changes from Git by renaming the modified file.
# Relative paths must be converted to absolute for renaming.
my ($target, $hidden) = (
"$config{srcdir}/${file}", "$config{srcdir}/${file}.${sha1}"
);
rename($target, $hidden)
or error("rename '$target' to '$hidden' failed: $!");
# Ensure to restore the renamed file on error.
push @undo, sub {
return if ! -e "$hidden"; # already renamed
rename($hidden, $target)
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or warn "rename '$hidden' to '$target' failed: $!";
};
my $branch = "throw_away_${sha1}"; # supposed to be unique
# Create a throw-away branch and rewind backward.
push @undo, sub { run_or_cry('git', 'branch', '-D', $branch) };
run_or_die('git', 'branch', $branch, $sha1);
# Switch to throw-away branch for the merge operation.
push @undo, sub {
if (!run_or_cry('git', 'checkout', $config{gitmaster_branch})) {
run_or_cry('git', 'checkout','-f',$config{gitmaster_branch});
}
};
run_or_die('git', 'checkout', $branch);
# Put the modified file in _this_ branch.
rename($hidden, $target)
or error("rename '$hidden' to '$target' failed: $!");
# _Silently_ commit all modifications in the current branch.
run_or_non('git', 'commit', '-m', $message, '-a');
# ... and re-switch to master.
run_or_die('git', 'checkout', $config{gitmaster_branch});
# Attempt to merge without complaining.
if (!run_or_non('git', 'pull', '--no-commit', '.', $branch)) {
$conflict = readfile($target);
run_or_die('git', 'reset', '--hard');
}
};
my $failure = $@;
# Process undo stack (in reverse order). By policy cleanup
# actions should normally print a warning on failure.
while (my $handle = pop @undo) {
$handle->();
}
error("Git merge failed!\n$failure\n") if $failure;
return $conflict;
}
{
my $prefix;
sub decode_git_file ($) {
my $file=shift;
# git does not output utf-8 filenames, but instead
# double-quotes them with the utf-8 characters
# escaped as \nnn\nnn.
if ($file =~ m/^"(.*)"$/) {
($file=$1) =~ s/\\([0-7]{1,3})/chr(oct($1))/eg;
}
# strip prefix if in a subdir
if (! defined $prefix) {
($prefix) = run_or_die('git', 'rev-parse', '--show-prefix');
if (! defined $prefix) {
$prefix="";
}
}
$file =~ s/^\Q$prefix\E//;
return decode("utf8", $file);
}
}
sub parse_diff_tree ($) {
# Parse the raw diff tree chunk and return the info hash.
# See git-diff-tree(1) for the syntax.
my $dt_ref = shift;
# End of stream?
return if !defined @{ $dt_ref } ||
!defined @{ $dt_ref }[0] || !length @{ $dt_ref }[0];
my %ci;
# Header line.
while (my $line = shift @{ $dt_ref }) {
return if $line !~ m/^(.+) ($sha1_pattern)/;
my $sha1 = $2;
$ci{'sha1'} = $sha1;
last;
}
# Identification lines for the commit.
while (my $line = shift @{ $dt_ref }) {
# Regexps are semi-stolen from gitweb.cgi.
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if ($line =~ m/^tree ([0-9a-fA-F]{40})$/) {
$ci{'tree'} = $1;
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}
elsif ($line =~ m/^parent ([0-9a-fA-F]{40})$/) {
# XXX: collecting in reverse order
push @{ $ci{'parents'} }, $1;
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}
elsif ($line =~ m/^(author|committer) (.*) ([0-9]+) (.*)$/) {
my ($who, $name, $epoch, $tz) =
($1, $2, $3, $4 );
$ci{ $who } = $name;
$ci{ "${who}_epoch" } = $epoch;
$ci{ "${who}_tz" } = $tz;
if ($name =~ m/^([^<]+)\s+<([^@>]+)/) {
$ci{"${who}_name"} = $1;
$ci{"${who}_username"} = $2;
}
elsif ($name =~ m/^([^<]+)\s+<>$/) {
$ci{"${who}_username"} = $1;
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}
else {
$ci{"${who}_username"} = $name;
}
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}
elsif ($line =~ m/^$/) {
# Trailing empty line signals next section.
last;
}
}
debug("No 'tree' seen in diff-tree output") if !defined $ci{'tree'};
if (defined $ci{'parents'}) {
$ci{'parent'} = @{ $ci{'parents'} }[0];
}
else {
$ci{'parent'} = 0 x 40;
}
# Commit message (optional).
while ($dt_ref->[0] =~ /^ /) {
my $line = shift @{ $dt_ref };
$line =~ s/^ //;
push @{ $ci{'comment'} }, $line;
}
shift @{ $dt_ref } if $dt_ref->[0] =~ /^$/;
# Modified files.
while (my $line = shift @{ $dt_ref }) {
if ($line =~ m{^
(:+) # number of parents
([^\t]+)\t # modes, sha1, status
(.*) # file names
$}xo) {
my $num_parents = length $1;
my @tmp = split(" ", $2);
my ($file, $file_to) = split("\t", $3);
my @mode_from = splice(@tmp, 0, $num_parents);
my $mode_to = shift(@tmp);
my @sha1_from = splice(@tmp, 0, $num_parents);
my $sha1_to = shift(@tmp);
my $status = shift(@tmp);
if (length $file) {
push @{ $ci{'details'} }, {
'file' => decode_git_file($file),
'sha1_from' => $sha1_from[0],
'sha1_to' => $sha1_to,
'mode_from' => $mode_from[0],
'mode_to' => $mode_to,
'status' => $status,
};
}
next;
};
last;
}
return \%ci;
}
sub git_commit_info ($;$) {
# Return an array of commit info hashes of num commits
# starting from the given sha1sum.
my ($sha1, $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',
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'-r', $sha1, '--', '.');
my @ci;
while (my $parsed = parse_diff_tree(\@raw_lines)) {
push @ci, $parsed;
}
warn "Cannot parse commit info for '$sha1' commit" if !@ci;
return wantarray ? @ci : $ci[0];
}
sub git_sha1 (;$) {
# Return head sha1sum (of given file).
my $file = shift || q{--};
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# Ignore error since a non-existing file might be given.
my ($sha1) = run_or_non('git', 'rev-list', '--max-count=1', 'HEAD',
'--', $file);
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if ($sha1) {
($sha1) = $sha1 =~ m/($sha1_pattern)/; # sha1 is untainted now
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}
else {
debug("Empty sha1sum for '$file'.");
}
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return defined $sha1 ? $sha1 : q{};
}
sub rcs_update () {
# Update working directory.
if (length $config{gitorigin_branch}) {
run_or_cry('git', 'pull', $config{gitorigin_branch});
}
}
sub rcs_prepedit ($) {
# Return the commit sha1sum of the file when editing begins.
# This will be later used in rcs_commit if a merge is required.
my ($file) = @_;
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return git_sha1($file);
}
sub rcs_commit (@) {
# Try to commit the page; returns undef on _success_ and
# a version of the page with the rcs's conflict markers on
# failure.
my %params=@_;
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# Check to see if the page has been changed by someone else since
# rcs_prepedit was called.
my $cur = git_sha1($params{file});
my ($prev) = $params{token} =~ /^($sha1_pattern)$/; # untaint
if (defined $cur && defined $prev && $cur ne $prev) {
my $conflict = merge_past($prev, $params{file}, $dummy_commit_msg);
return $conflict if defined $conflict;
}
rcs_add($params{file});
return rcs_commit_staged(
message => $params{message},
session => $params{session},
);
}
sub rcs_commit_staged (@) {
# Commits all staged changes. Changes can be staged using rcs_add,
# rcs_remove, and rcs_rename.
my %params=@_;
my %env=%ENV;
if (defined $params{session}) {
# Set the commit author and email based on web session info.
my $u;
if (defined $params{session}->param("name")) {
$u=$params{session}->param("name");
}
elsif (defined $params{session}->remote_addr()) {
$u=$params{session}->remote_addr();
}
if (defined $u) {
$u=encode_utf8($u);
$ENV{GIT_AUTHOR_NAME}=$u;
}
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if (defined $params{session}->param("nickname")) {
$u=encode_utf8($params{session}->param("nickname"));
$u=~s/\s+/_/g;
$u=~s/[^-_0-9[:alnum:]]+//g;
}
if (defined $u) {
$ENV{GIT_AUTHOR_EMAIL}="$u\@web";
}
}
$params{message} = IkiWiki::possibly_foolish_untaint($params{message});
my @opts;
if ($params{message} !~ /\S/) {
# Force git to allow empty commit messages.
# (If this version of git supports it.)
my ($version)=`git --version` =~ /git version (.*)/;
if ($version ge "1.5.4") {
push @opts, '--cleanup=verbatim';
}
else {
$params{message}.=".";
}
}
push @opts, '-q';
# git commit returns non-zero if file has not been really changed.
# so we should ignore its exit status (hence run_or_non).
if (run_or_non('git', 'commit', @opts, '-m', $params{message})) {
if (length $config{gitorigin_branch}) {
run_or_cry('git', 'push', $config{gitorigin_branch});
}
}
%ENV=%env;
return undef; # success
}
sub rcs_add ($) {
# Add file to archive.
my ($file) = @_;
run_or_cry('git', 'add', $file);
}
sub rcs_remove ($) {
# Remove file from archive.
my ($file) = @_;
run_or_cry('git', 'rm', '-f', $file);
}
sub rcs_rename ($$) {
my ($src, $dest) = @_;
run_or_cry('git', 'mv', '-f', $src, $dest);
}
sub rcs_recentchanges ($) {
# List of recent changes.
my ($num) = @_;
eval q{use Date::Parse};
error($@) if $@;
my @rets;
foreach my $ci (git_commit_info('HEAD', $num || 1)) {
# Skip redundant commits.
next if ($ci->{'comment'} && @{$ci->{'comment'}}[0] eq $dummy_commit_msg);
my ($sha1, $when) = (
$ci->{'sha1'},
$ci->{'author_epoch'}
);
my @pages;
foreach my $detail (@{ $ci->{'details'} }) {
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my $file = $detail->{'file'};
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my $diffurl = defined $config{'diffurl'} ? $config{'diffurl'} : "";
$diffurl =~ s/\[\[file\]\]/$file/go;
$diffurl =~ s/\[\[sha1_parent\]\]/$ci->{'parent'}/go;
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$diffurl =~ s/\[\[sha1_from\]\]/$detail->{'sha1_from'}/go;
$diffurl =~ s/\[\[sha1_to\]\]/$detail->{'sha1_to'}/go;
$diffurl =~ s/\[\[sha1_commit\]\]/$sha1/go;
push @pages, {
page => pagename($file),
diffurl => $diffurl,
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};
}
my @messages;
my $pastblank=0;
foreach my $line (@{$ci->{'comment'}}) {
$pastblank=1 if $line eq '';
next if $pastblank && $line=~m/^ *(signed[ \-]off[ \-]by[ :]|acked[ \-]by[ :]|cc[ :])/i;
push @messages, { line => $line };
}
my $user=$ci->{'author_username'};
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my $web_commit = ($ci->{'author'} =~ /\@web>/);
my $nickname;
# Set nickname only if a non-url author_username is available,
# and author_name is an url.
if ($user !~ /:\/\// && defined $ci->{'author_name'} &&
$ci->{'author_name'} =~ /:\/\//) {
$nickname=$user;
$user=$ci->{'author_name'};
}
# compatability code for old web commit messages
if (! $web_commit &&
defined $messages[0] &&
$messages[0]->{line} =~ m/$config{web_commit_regexp}/) {
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$user = defined $2 ? "$2" : "$3";
$messages[0]->{line} = $4;
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$web_commit=1;
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}
push @rets, {
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rev => $sha1,
user => $user,
nickname => $nickname,
committype => $web_commit ? "web" : "git",
when => $when,
message => [@messages],
pages => [@pages],
} if @pages;
last if @rets >= $num;
}
return @rets;
}
sub rcs_diff ($) {
my $rev=shift;
my ($sha1) = $rev =~ /^($sha1_pattern)$/; # untaint
my @lines;
foreach my $line (run_or_non("git", "show", $sha1)) {
if (@lines || $line=~/^diff --git/) {
push @lines, $line."\n";
}
}
if (wantarray) {
return @lines;
}
else {
return join("", @lines);
}
}
{
my %time_cache;
sub findtimes ($$) {
my $file=shift;
my $id=shift; # 0 = mtime ; 1 = ctime
if (! keys %time_cache) {
my $date;
foreach my $line (run_or_die('git', 'log',
'--pretty=format:%ct',
'--name-only', '--relative')) {
if (! defined $date && $line =~ /^(\d+)$/) {
$date=$line;
}
elsif (! length $line) {
$date=undef;
}
else {
my $f=decode_git_file($line);
if (! $time_cache{$f}) {
$time_cache{$f}[0]=$date; # mtime
}
$time_cache{$f}[1]=$date; # ctime
}
}
}
return exists $time_cache{$file} ? $time_cache{$file}[$id] : 0;
}
}
sub rcs_getctime ($) {
my $file=shift;
return findtimes($file, 1);
}
sub rcs_getmtime ($) {
my $file=shift;
return findtimes($file, 0);
}
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.
my $subdir="";
my $dir=$config{srcdir};
while (! -d "$dir/.git") {
$subdir=IkiWiki::basename($dir)."/".$subdir;
$dir=IkiWiki::dirname($dir);
if (! length $dir) {
error("cannot determine root of git repo");
}
}
my @rets;
while (<>) {
chomp;
my ($oldrev, $newrev, $refname) = split(' ', $_, 3);
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# only allow changes to gitmaster_branch
if ($refname !~ /^refs\/heads\/\Q$config{gitmaster_branch}\E$/) {
error sprintf(gettext("you are not allowed to change %s"), $refname);
}
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# Avoid chdir when running git here, because the changes
# are in the master git repo, not the srcdir repo.
# The pre-recieve hook already puts us in the right place.
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$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'};
# check that all changed files are in the
# subdir
if (length $subdir &&
! ($file =~ s/^\Q$subdir\E//)) {
error sprintf(gettext("you are not allowed to change %s"), $file);
}
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my ($action, $mode, $path);
if ($detail->{'status'} =~ /^[M]+\d*$/) {
$action="change";
$mode=$detail->{'mode_to'};
}
elsif ($detail->{'status'} =~ /^[AM]+\d*$/) {
$action="add";
$mode=$detail->{'mode_to'};
}
elsif ($detail->{'status'} =~ /^[DAM]+\d*/) {
$action="remove";
$mode=$detail->{'mode_from'};
}
else {
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,
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path => $path,
};
}
}
}
return reverse @rets;
}
1