458 lines
13 KiB
Perl
458 lines
13 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 $origin_branch = 'origin'; # Git ref for main repository
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my $master_branch = 'master'; # working branch
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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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open STDERR, ">&STDOUT"
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or error("Cannot dup STDOUT: $!");
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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 || sub { })->("'@cmdline' failed: $!") if $?;
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return wantarray ? @lines : ($? == 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', $master_branch)) {
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run_or_cry('git-checkout','-f',$master_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', $master_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 ($dt_ref) = @_;
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# End of stream?
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return if !defined @{ $dt_ref } || !length @{ $dt_ref }[0];
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my %ci;
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# Header line.
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HEADER: while (my $line = shift @{ $dt_ref }) {
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return if $line !~ m/^(.+) ($sha1_pattern)/;
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my $sha1 = $1;
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$ci{'sha1'} = $sha1;
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last HEADER;
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}
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# Identification lines for the commit.
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IDENT: 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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} 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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} 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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} else {
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$ci{"${who}_fullname"} =
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$ci{"${who}_username"} = $name;
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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 IDENT;
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}
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}
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error("No 'tree' or 'parents' seen in diff-tree output")
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if !defined $ci{'tree'} || !defined $ci{'parents'};
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$ci{'parent'} = @{ $ci{'parents'} }[0];
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# Commit message.
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COMMENT: 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 COMMENT;
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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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FILE: while (my $line = shift @{ $dt_ref }) {
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if ($line =~ m{^:
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([0-7]{6})[ ] # from mode
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([0-7]{6})[ ] # to mode
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($sha1_pattern)[ ] # from sha1
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($sha1_pattern)[ ] # to sha1
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(.) # status
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([0-9]{0,3})\t # similarity
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(.*) # file
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$}xo) {
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my ($sha1_from, $sha1_to, $file) =
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($3, $4, $7 );
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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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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,
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'sha1_to' => $sha1_to,
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};
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}
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next FILE;
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};
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last FILE;
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}
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warn "No detail in diff-tree output" if !defined $ci{'details'};
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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 (default: HEAD).
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my ($sha1, $num) = @_;
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$num ||= 1;
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my @raw_lines =
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run_or_die(qq{git-rev-list --max-count=$num $sha1 |
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git-diff-tree --stdin --pretty=raw -M -r});
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my @ci;
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while (my $parsed = _parse_diff_tree(\@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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run_or_cry('git-pull', $origin_branch);
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} #}}}
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sub rcs_prepedit ($) { #{{{
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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) = @_;
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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(1)) 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 $conflict;
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}
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# git-commit(1) returns non-zero if file has not been really changed.
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# so we should ignore its exit status (hence run_or_non).
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$message = possibly_foolish_untaint($message);
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if (run_or_non('git-commit', '-m', $message, '-i', $file)) {
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unlockwiki();
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run_or_cry('git-push', $origin_branch);
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}
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return undef; # success
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} #}}}
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sub rcs_add ($) { # {{{
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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 $@;
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my ($sha1, $type, $when, $diffurl, $user, @pages, @message, @rets);
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INFO: foreach my $ci (git_commit_info('HEAD', $num)) {
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my $title = @{ $ci->{'comment'} }[0];
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# Skip redundant commits.
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next INFO if ($title eq $dummy_commit_msg);
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$sha1 = $ci->{'sha1'};
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$type = "web";
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$when = time - $ci->{'author_epoch'};
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DETAIL: foreach my $detail (@{ $ci->{'details'} }) {
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my $diffurl = $config{'diffurl'};
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my $file = $detail->{'file'};
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$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 @message, { line => $title };
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if (defined $message[0] &&
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$message[0]->{line} =~ m/$config{web_commit_regexp}/) {
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$user=defined $2 ? "$2" : "$3";
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$message[0]->{line}=$4;
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} else {
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$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 => $when,
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message => [@message],
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pages => [@pages],
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} if @pages;
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$sha1 = $type = $when = $diffurl = $user = undef;
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@pages = @message = ();
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}
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return @rets;
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} #}}}
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sub rcs_notify () { #{{{
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# Send notification mail to subscribed users.
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#
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# In usual Git usage, hooks/update script is presumed to send
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# notification mails (see git-receive-pack(1)). But we prefer
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# hooks/post-update to support IkiWiki commits coming from a
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# cloned repository (through command line) because post-update
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# is called _after_ each ref in repository is updated (update
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# hook is called _before_ the repository is updated). Since
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# post-update hook does not accept command line arguments, we
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# don't have an $ENV variable in this function.
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#
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# Here, we rely on a simple fact: we can extract all parts of the
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# notification content by parsing the "HEAD" commit (which also
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# triggers a refresh of IkiWiki pages) and we can obtain the diff
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# by comparing HEAD and HEAD^ (the previous commit).
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my $sha1 = 'HEAD'; # the commit which triggers this action
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my $ci = git_commit_info($sha1);
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return if !defined $ci;
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my @changed_pages = map { $_->{'file'} } @{ $ci->{'details'} };
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my ($user, $message);
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if (@{ $ci->{'comment'} }[0] =~ m/$config{web_commit_regexp}/) {
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$user = defined $2 ? "$2" : "$3";
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$message = $4;
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} else {
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$user = $ci->{'author_username'};
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$message = join "\n", @{ $ci->{'comment'} };
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}
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require IkiWiki::UserInfo;
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send_commit_mails(
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sub {
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$message;
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},
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sub {
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join "\n", run_or_die('git-diff', "${sha1}^", $sha1);
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}, $user, @changed_pages);
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} #}}}
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sub rcs_getctime ($) { #{{{
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# Get the ctime of file.
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my ($file) = @_;
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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) . "\n");
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return $ctime;
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} #}}}
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1
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