436 lines
12 KiB
Perl
436 lines
12 KiB
Perl
#!/usr/bin/perl
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use warnings;
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use strict;
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use IkiWiki;
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use Encode;
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use open qw{:utf8 :std};
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package IkiWiki;
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my $sha1_pattern = qr/[0-9a-fA-F]{40}/; # pattern to validate Git sha1sums
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my $dummy_commit_msg = 'dummy commit'; # message to skip in recent changes
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sub _safe_git (&@) { #{{{
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# Start a child process safely without resorting /bin/sh.
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# Return command output or success state (in scalar context).
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my ($error_handler, @cmdline) = @_;
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my $pid = open my $OUT, "-|";
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error("Cannot fork: $!") if !defined $pid;
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if (!$pid) {
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# In child.
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# Git commands want to be in wc.
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chdir $config{srcdir}
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or error("Cannot chdir to $config{srcdir}: $!");
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exec @cmdline or error("Cannot exec '@cmdline': $!");
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}
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# In parent.
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my @lines;
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while (<$OUT>) {
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chomp;
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push @lines, $_;
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}
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close $OUT;
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$error_handler->("'@cmdline' failed: $!") if $? && $error_handler;
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return wantarray ? @lines : ($? == 0);
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}
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# Convenient wrappers.
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sub run_or_die ($@) { _safe_git(\&error, @_) }
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sub run_or_cry ($@) { _safe_git(sub { warn @_ }, @_) }
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sub run_or_non ($@) { _safe_git(undef, @_) }
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#}}}
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sub _merge_past ($$$) { #{{{
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# Unlike with Subversion, Git cannot make a 'svn merge -rN:M file'.
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# Git merge commands work with the committed changes, except in the
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# implicit case of '-m' of git checkout(1). So we should invent a
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# kludge here. In principle, we need to create a throw-away branch
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# in preparing for the merge itself. Since branches are cheap (and
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# branching is fast), this shouldn't cost high.
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#
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# The main problem is the presence of _uncommitted_ local changes. One
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# possible approach to get rid of this situation could be that we first
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# make a temporary commit in the master branch and later restore the
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# initial state (this is possible since Git has the ability to undo a
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# commit, i.e. 'git reset --soft HEAD^'). The method can be summarized
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# as follows:
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#
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# - create a diff of HEAD:current-sha1
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# - dummy commit
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# - create a dummy branch and switch to it
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# - rewind to past (reset --hard to the current-sha1)
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# - apply the diff and commit
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# - switch to master and do the merge with the dummy branch
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# - make a soft reset (undo the last commit of master)
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#
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# The above method has some drawbacks: (1) it needs a redundant commit
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# just to get rid of local changes, (2) somewhat slow because of the
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# required system forks. Until someone points a more straight method
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# (which I would be grateful) I have implemented an alternative method.
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# In this approach, we hide all the modified files from Git by renaming
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# them (using the 'rename' builtin) and later restore those files in
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# the throw-away branch (that is, we put the files themselves instead
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# of applying a patch).
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my ($sha1, $file, $message) = @_;
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my @undo; # undo stack for cleanup in case of an error
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my $conflict; # file content with conflict markers
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eval {
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# Hide local changes from Git by renaming the modified file.
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# Relative paths must be converted to absolute for renaming.
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my ($target, $hidden) = (
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"$config{srcdir}/${file}", "$config{srcdir}/${file}.${sha1}"
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);
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rename($target, $hidden)
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or error("rename '$target' to '$hidden' failed: $!");
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# Ensure to restore the renamed file on error.
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push @undo, sub {
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return if ! -e "$hidden"; # already renamed
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rename($hidden, $target)
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or warn "rename '$hidden' to '$target' failed: $!";
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};
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my $branch = "throw_away_${sha1}"; # supposed to be unique
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# Create a throw-away branch and rewind backward.
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push @undo, sub { run_or_cry('git', 'branch', '-D', $branch) };
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run_or_die('git', 'branch', $branch, $sha1);
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# Switch to throw-away branch for the merge operation.
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push @undo, sub {
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if (!run_or_cry('git', 'checkout', $config{gitmaster_branch})) {
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run_or_cry('git', 'checkout','-f',$config{gitmaster_branch});
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}
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};
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run_or_die('git', 'checkout', $branch);
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# Put the modified file in _this_ branch.
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rename($hidden, $target)
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or error("rename '$hidden' to '$target' failed: $!");
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# _Silently_ commit all modifications in the current branch.
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run_or_non('git', 'commit', '-m', $message, '-a');
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# ... and re-switch to master.
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run_or_die('git', 'checkout', $config{gitmaster_branch});
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# Attempt to merge without complaining.
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if (!run_or_non('git', 'pull', '--no-commit', '.', $branch)) {
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$conflict = readfile($target);
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run_or_die('git', 'reset', '--hard');
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}
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};
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my $failure = $@;
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# Process undo stack (in reverse order). By policy cleanup
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# actions should normally print a warning on failure.
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while (my $handle = pop @undo) {
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$handle->();
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}
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error("Git merge failed!\n$failure\n") if $failure;
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return $conflict;
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} #}}}
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sub _parse_diff_tree ($@) { #{{{
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# Parse the raw diff tree chunk and return the info hash.
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# See git-diff-tree(1) for the syntax.
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my ($prefix, $dt_ref) = @_;
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# End of stream?
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return if !defined @{ $dt_ref } ||
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!defined @{ $dt_ref }[0] || !length @{ $dt_ref }[0];
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my %ci;
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# Header line.
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while (my $line = shift @{ $dt_ref }) {
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return if $line !~ m/^(.+) ($sha1_pattern)/;
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my $sha1 = $2;
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$ci{'sha1'} = $sha1;
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last;
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}
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# Identification lines for the commit.
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while (my $line = shift @{ $dt_ref }) {
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# Regexps are semi-stolen from gitweb.cgi.
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if ($line =~ m/^tree ([0-9a-fA-F]{40})$/) {
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$ci{'tree'} = $1;
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}
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elsif ($line =~ m/^parent ([0-9a-fA-F]{40})$/) {
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# XXX: collecting in reverse order
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push @{ $ci{'parents'} }, $1;
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}
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elsif ($line =~ m/^(author|committer) (.*) ([0-9]+) (.*)$/) {
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my ($who, $name, $epoch, $tz) =
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($1, $2, $3, $4 );
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$ci{ $who } = $name;
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$ci{ "${who}_epoch" } = $epoch;
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$ci{ "${who}_tz" } = $tz;
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if ($name =~ m/^([^<]+) <([^@>]+)/) {
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my ($fullname, $username) = ($1, $2);
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$ci{"${who}_fullname"} = $fullname;
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$ci{"${who}_username"} = $username;
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}
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else {
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$ci{"${who}_fullname"} =
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$ci{"${who}_username"} = $name;
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}
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}
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elsif ($line =~ m/^$/) {
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# Trailing empty line signals next section.
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last;
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}
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}
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debug("No 'tree' seen in diff-tree output") if !defined $ci{'tree'};
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if (defined $ci{'parents'}) {
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$ci{'parent'} = @{ $ci{'parents'} }[0];
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}
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else {
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$ci{'parent'} = 0 x 40;
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}
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# Commit message.
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while (my $line = shift @{ $dt_ref }) {
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if ($line =~ m/^$/) {
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# Trailing empty line signals next section.
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last;
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};
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$line =~ s/^ //;
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push @{ $ci{'comment'} }, $line;
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}
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# Modified files.
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while (my $line = shift @{ $dt_ref }) {
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if ($line =~ m{^
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(:+) # number of parents
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([^\t]+)\t # modes, sha1, status
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(.*) # file names
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$}xo) {
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my $num_parents = length $1;
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my @tmp = split(" ", $2);
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my ($file, $file_to) = split("\t", $3);
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my @mode_from = splice(@tmp, 0, $num_parents);
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my $mode_to = shift(@tmp);
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my @sha1_from = splice(@tmp, 0, $num_parents);
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my $sha1_to = shift(@tmp);
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my $status = shift(@tmp);
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if ($file =~ m/^"(.*)"$/) {
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($file=$1) =~ s/\\([0-7]{1,3})/chr(oct($1))/eg;
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}
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$file =~ s/^\Q$prefix\E//;
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if (length $file) {
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push @{ $ci{'details'} }, {
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'file' => decode_utf8($file),
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'sha1_from' => $sha1_from[0],
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'sha1_to' => $sha1_to,
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};
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}
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next;
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};
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last;
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}
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return \%ci;
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} #}}}
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sub git_commit_info ($;$) { #{{{
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# Return an array of commit info hashes of num commits (default: 1)
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# starting from the given sha1sum.
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my ($sha1, $num) = @_;
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$num ||= 1;
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my @raw_lines = run_or_die('git', 'log', "--max-count=$num",
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'--pretty=raw', '--raw', '--abbrev=40', '--always', '-c',
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'-r', $sha1, '--', '.');
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my ($prefix) = run_or_die('git', 'rev-parse', '--show-prefix');
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my @ci;
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while (my $parsed = _parse_diff_tree(($prefix or ""), \@raw_lines)) {
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push @ci, $parsed;
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}
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warn "Cannot parse commit info for '$sha1' commit" if !@ci;
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return wantarray ? @ci : $ci[0];
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} #}}}
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sub git_sha1 (;$) { #{{{
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# Return head sha1sum (of given file).
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my $file = shift || q{--};
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# Ignore error since a non-existing file might be given.
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my ($sha1) = run_or_non('git', 'rev-list', '--max-count=1', 'HEAD', $file);
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if ($sha1) {
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($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{};
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} #}}}
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sub rcs_update () { #{{{
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# Update working directory.
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if (length $config{gitorigin_branch}) {
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run_or_cry('git', 'pull', $config{gitorigin_branch});
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}
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} #}}}
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sub rcs_prepedit ($) { #{{{
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# Return the commit sha1sum of the file when editing begins.
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# This will be later used in rcs_commit if a merge is required.
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my ($file) = @_;
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return git_sha1($file);
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} #}}}
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sub rcs_commit ($$$;$$) { #{{{
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# Try to commit the page; returns undef on _success_ and
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# a version of the page with the rcs's conflict markers on
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# failure.
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my ($file, $message, $rcstoken, $user, $ipaddr) = @_;
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if (defined $user) {
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$message = "web commit by $user" .
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(length $message ? ": $message" : "");
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}
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elsif (defined $ipaddr) {
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$message = "web commit from $ipaddr" .
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(length $message ? ": $message" : "");
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}
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# XXX: Wiki directory is in the unlocked state when starting this
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# action. But it takes time for a Git process to finish its job
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# (especially if a merge required), so we must re-lock to prevent
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# race conditions. Only when the time of the real commit action
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# (i.e. git push) comes, we'll unlock the directory.
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lockwiki();
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# Check to see if the page has been changed by someone else since
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# rcs_prepedit was called.
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my $cur = git_sha1($file);
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my ($prev) = $rcstoken =~ /^($sha1_pattern)$/; # untaint
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if (defined $cur && defined $prev && $cur ne $prev) {
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my $conflict = _merge_past($prev, $file, $dummy_commit_msg);
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return $conflict if defined $conflict;
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}
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# git commit returns non-zero if file has not been really changed.
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# so we should ignore its exit status (hence run_or_non).
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$message = possibly_foolish_untaint($message);
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if (run_or_non('git', 'commit', '-q', '-m', $message, '-i', $file)) {
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unlockwiki();
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if (length $config{gitorigin_branch}) {
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run_or_cry('git', 'push', $config{gitorigin_branch});
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}
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}
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return undef; # success
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} #}}}
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sub rcs_add ($) { # {{{
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# Add file to archive.
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my ($file) = @_;
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run_or_cry('git', 'add', $file);
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} #}}}
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sub rcs_recentchanges ($) { #{{{
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# List of recent changes.
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my ($num) = @_;
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eval q{use Date::Parse};
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error($@) if $@;
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my @rets;
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foreach my $ci (git_commit_info('HEAD', $num)) {
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# Skip redundant commits.
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next if (@{$ci->{'comment'}}[0] eq $dummy_commit_msg);
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my ($sha1, $when) = (
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$ci->{'sha1'},
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$ci->{'author_epoch'}
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);
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my (@pages, @messages);
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foreach my $detail (@{ $ci->{'details'} }) {
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my $file = $detail->{'file'};
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my $diffurl = $config{'diffurl'};
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$diffurl =~ s/\[\[file\]\]/$file/go;
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$diffurl =~ s/\[\[sha1_parent\]\]/$ci->{'parent'}/go;
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$diffurl =~ s/\[\[sha1_from\]\]/$detail->{'sha1_from'}/go;
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$diffurl =~ s/\[\[sha1_to\]\]/$detail->{'sha1_to'}/go;
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push @pages, {
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page => pagename($file),
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diffurl => $diffurl,
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};
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}
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push @messages, { line => $_ } foreach @{$ci->{'comment'}};
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my ($user, $type) = (q{}, "web");
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if (defined $messages[0] &&
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$messages[0]->{line} =~ m/$config{web_commit_regexp}/) {
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$user = defined $2 ? "$2" : "$3";
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$messages[0]->{line} = $4;
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}
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else {
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$type ="git";
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$user = $ci->{'author_username'};
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}
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push @rets, {
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rev => $sha1,
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user => $user,
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committype => $type,
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when => $when,
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message => [@messages],
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pages => [@pages],
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} if @pages;
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last if @rets >= $num;
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}
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return @rets;
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} #}}}
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sub rcs_getctime ($) { #{{{
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my $file=shift;
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# Remove srcdir prefix
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$file =~ s/^\Q$config{srcdir}\E\/?//;
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my $sha1 = git_sha1($file);
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my $ci = git_commit_info($sha1);
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my $ctime = $ci->{'author_epoch'};
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debug("ctime for '$file': ". localtime($ctime));
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return $ctime;
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} #}}}
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1
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