1 # Copyright (C) all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
4 # show any VCS object, similar to "git show"
6 # This can use a "solver" to reconstruct blobs based on git
7 # patches (with abbreviated OIDs in the header). However, the
8 # abbreviated OIDs must match exactly what's in the original
9 # email (unless a normal code repo already has the blob).
11 # In other words, we can only reliably reconstruct blobs based
12 # on links generated by ViewDiff (and only if the emailed
13 # patches apply 100% cleanly to published blobs).
15 package PublicInbox::ViewVCS;
18 use File::Temp 0.19 (); # newdir
19 use PublicInbox::SolverGit;
20 use PublicInbox::GitAsyncCat;
21 use PublicInbox::WwwStream qw(html_oneshot);
22 use PublicInbox::Linkify;
23 use PublicInbox::Tmpfile;
24 use PublicInbox::ViewDiff qw(flush_diff uri_escape_path);
25 use PublicInbox::View;
27 use Text::Wrap qw(wrap);
28 use PublicInbox::Hval qw(ascii_html to_filename);
30 require PublicInbox::HlMod;
31 PublicInbox::HlMod->new;
34 my %QP_MAP = ( A => 'oid_a', a => 'path_a', b => 'path_b' );
35 our $MAX_SIZE = 1024 * 1024; # TODO: configurable
36 my $BIN_DETECT = 8000; # same as git
37 my $SHOW_FMT = '--pretty=format:'.join('%n', '%P', '%p', '%H', '%T', '%s', '%f',
38 '%an <%ae> %ai', '%cn <%ce> %ci', '%b%x00');
41 '100644' => ' ', # blob
42 '100755' => 'x', # executable blob
43 '040000' => 'd', # tree
44 '120000' => 'l', # symlink
45 '160000' => 'g', # commit (gitlink)
48 sub html_page ($$;@) {
49 my ($ctx, $code) = @_[0, 1];
50 my $wcb = delete $ctx->{-wcb};
51 $ctx->{-upfx} = '../../'; # from "/$INBOX/$OID/s/"
52 my $res = html_oneshot($ctx, $code, @_[2..$#_]);
53 $wcb ? $wcb->($res) : $res;
58 my $log = delete $ctx->{lh} // die 'BUG: already captured debug log';
59 if (!seek($log, 0, 0)) {
61 return '<pre>debug log seek error</pre>';
63 $log = do { local $/; <$log> } // do {
64 warn "readline(log): $!";
65 return '<pre>debug log read error</pre>';
67 $ctx->{-linkify} //= PublicInbox::Linkify->new;
68 "<hr><pre>debug log:\n\n".
69 $ctx->{-linkify}->to_html($log).'</pre>';
72 sub stream_blob_parse_hdr { # {parse_hdr} for Qspawn
73 my ($r, $bref, $ctx) = @_;
74 my ($git, $oid, $type, $size, $di) = @{$ctx->{-res}};
75 my @cl = ('Content-Length', $size);
76 if (!defined $r) { # sysread error
77 html_page($ctx, 500, dbg_log($ctx));
78 } elsif (index($$bref, "\0") >= 0) {
79 [200, [qw(Content-Type application/octet-stream), @cl] ];
81 my $n = length($$bref);
82 if ($n >= $BIN_DETECT || $n == $size) {
83 return [200, [ 'Content-Type',
84 'text/plain; charset=UTF-8', @cl ] ];
87 my $log = dbg_log($ctx);
88 warn "premature EOF on $oid $log";
89 return html_page($ctx, 500, $log);
91 undef; # bref keeps growing
95 sub stream_large_blob ($$) {
98 my ($git, $oid, $type, $size, $di) = @$res;
99 my $cmd = ['git', "--git-dir=$git->{git_dir}", 'cat-file', $type, $oid];
100 my $qsp = PublicInbox::Qspawn->new($cmd);
101 my $env = $ctx->{env};
102 $env->{'qspawn.wcb'} = delete $ctx->{-wcb};
103 $qsp->psgi_return($env, undef, \&stream_blob_parse_hdr, $ctx);
106 sub show_other_result ($$) { # tag
107 my ($bref, $ctx) = @_;
108 if (my $qsp_err = delete $ctx->{-qsp_err}) {
109 return html_page($ctx, 500, dbg_log($ctx) .
110 "git show error:$qsp_err");
112 my $l = PublicInbox::Linkify->new;
113 utf8::decode($$bref);
114 html_page($ctx, 200, '<pre>', $l->to_html($$bref), '</pre><hr>',
118 sub cmt_title { # git->cat_async callback
119 my ($bref, $oid, $type, $size, $ctx) = @_;
120 utf8::decode($$bref);
121 my $title = $$bref =~ /\r?\n\r?\n([^\r\n]+)\r?\n?/ ? $1 : '';
122 push(@{$ctx->{-cmt_pt}} , ascii_html($title)) == @{$ctx->{-cmt_P}} and
126 sub show_commit_start { # ->psgi_qx callback
127 my ($bref, $ctx) = @_;
128 if (my $qsp_err = delete $ctx->{-qsp_err}) {
129 return html_page($ctx, 500, dbg_log($ctx) .
130 "git show/patch-id error:$qsp_err");
132 my $patchid = (split(/ /, $$bref))[0]; # ignore commit
133 $ctx->{-q_value_html} = "patchid:$patchid" if defined $patchid;
134 open my $fh, '<:utf8', "$ctx->{-tmp}/h" or
135 die "open $ctx->{-tmp}/h: $!";
136 chop(my $buf = do { local $/ = "\0"; <$fh> });
139 ($P, $p, @{$ctx->{cmt_info}}) = split(/\n/, $buf, 9);
140 return cmt_finalize($ctx) if !$P;
141 @{$ctx->{-cmt_P}} = split(/ /, $P);
142 @{$ctx->{-cmt_p}} = split(/ /, $p); # abbreviated
143 if ($ctx->{env}->{'pi-httpd.async'}) {
144 for (@{$ctx->{-cmt_P}}) {
145 ibx_async_cat($ctx, $_, \&cmt_title, $ctx);
147 } else { # synchronous
148 for (@{$ctx->{-cmt_P}}) {
149 $ctx->{git}->cat_async($_, \&cmt_title, $ctx);
151 $ctx->{git}->cat_async_wait;
157 $ctx->{-linkify} //= PublicInbox::Linkify->new;
158 my $upfx = $ctx->{-upfx} = '../../'; # from "/$INBOX/$OID/s/"
159 my ($H, $T, $s, $f, $au, $co, $bdy) = @{delete $ctx->{cmt_info}};
160 # try to keep author and committer dates lined up
161 my $x = length($au) - length($co);
169 $_ = ascii_html($_) for ($au, $co);
170 $au =~ s!(> +)([0-9]{4,}-\S+ \S+)!
171 my ($gt, $t) = ($1, $2);
175 title="list contemporary emails">$2</a>)
177 $ctx->{-title_html} = $s = $ctx->{-linkify}->to_html($s);
178 my ($P, $p, $pt) = delete @$ctx{qw(-cmt_P -cmt_p -cmt_pt)};
179 $_ = qq(<a href="$upfx$_/s/">).shift(@$p).'</a> '.shift(@$pt) for @$P;
182 href="$f.patch">patch</a>)\n <a href=#parent>parent</a> $P->[0]};
184 $x = qq(\n <a href=#parents>parents</a> $P->[0]\n);
186 $x .= qq( $_\n) for @$P;
189 $x = ' (<a href=#root_commit>root commit</a>)';
191 PublicInbox::WwwStream::html_init($ctx);
193 <pre> <a href=#commit>commit</a> $H$x
194 <a href=#tree>tree</a> <a href="$upfx$T/s/">$T</a>
200 $ctx->zmore("\n", $ctx->{-linkify}->to_html($bdy)) if length($bdy);
202 open my $fh, '<:utf8', "$ctx->{-tmp}/p" or
203 die "open $ctx->{-tmp}/p: $!";
204 if (-s $fh > $MAX_SIZE) {
205 $ctx->zmore("---\n patch is too large to show\n");
206 } else { # prepare flush_diff:
208 $ctx->{obuf} = \$bdy;
209 $ctx->{-apfx} = $ctx->{-spfx} = $upfx;
211 $ctx->{-anchors} = {} if $x =~ /^diff --git /sm;
212 flush_diff($ctx, \$x); # undefs $x
215 # TODO: should there be another textarea which attempts to
216 # search for the exact email which was applied to make this
218 if (my $qry = delete $ctx->{-qry}) {
220 for (@{$qry->{dfpost}}, @{$qry->{dfpre}}) {
221 # keep blobs as short as reasonable, emails
222 # are going to be older than what's in git
223 substr($_, 7, 64, '');
226 chop $q; # no trailing SP
227 local $Text::Wrap::columns = PublicInbox::View::COLS;
228 local $Text::Wrap::huge = 'overflow';
229 $q = wrap('', '', $q);
230 my $rows = ($q =~ tr/\n/\n/) + 1;
233 <hr><form action=$upfx
234 id=related><pre>find related emails, including ancestors/descendants/conflicts
235 <textarea name=q cols=${\PublicInbox::View::COLS} rows=$rows>$q</textarea>
236 <input type=submit value=search
237 />\t(<a href=${upfx}_/text/help/>help</a>)</pre></form>
245 id=commit>Commit</dfn> objects reference one tree, and zero or more parents.
248 id=parent>parent</dfn> commits can typically generate a patch in
249 unified diff format via `git format-patch'.
251 Multiple <dfn id=parents>parents</dfn> means the commit is a merge.
253 <dfn id=root_commit>Root commits</dfn> have no ancestor. Note that it is
254 possible to have multiple root commits when merging independent histories.
256 Every commit references one top-level <dfn id=tree>tree</dfn> object.</pre>
258 $x = $ctx->zflush($x, $ctx->_html_end);
259 my $res_hdr = delete $ctx->{-res_hdr};
260 push @$res_hdr, 'Content-Length', length($x);
261 delete($ctx->{env}->{'qspawn.wcb'})->([200, $res_hdr, [$x]]);
264 sub stream_patch_parse_hdr { # {parse_hdr} for Qspawn
265 my ($r, $bref, $ctx) = @_;
266 if (!defined $r) { # sysread error
267 html_page($ctx, 500, dbg_log($ctx));
268 } elsif (index($$bref, "\n\n") >= 0) {
269 my $eml = bless { hdr => $bref }, 'PublicInbox::Eml';
270 my $fn = to_filename($eml->header('Subject') // '');
271 $fn = substr($fn // 'PATCH-no-subject', 6); # drop "PATCH-"
272 return [ 200, [ 'Content-Type', 'text/plain; charset=UTF-8',
273 'Content-Disposition',
274 qq(inline; filename=$fn.patch) ] ];
276 my $log = dbg_log($ctx);
277 warn "premature EOF on $ctx->{patch_oid} $log";
278 return html_page($ctx, 500, $log);
280 undef; # bref keeps growing until "\n\n"
284 sub show_patch ($$) {
285 my ($ctx, $res) = @_;
286 my ($git, $oid) = @$res;
287 my @cmd = ('git', "--git-dir=$git->{git_dir}",
288 qw(format-patch -1 --stdout -C),
289 "--signature=git format-patch -1 --stdout -C $oid", $oid);
290 my $qsp = PublicInbox::Qspawn->new(\@cmd);
291 $ctx->{env}->{'qspawn.wcb'} = delete $ctx->{-wcb};
292 $ctx->{patch_oid} = $oid;
293 $qsp->psgi_return($ctx->{env}, undef, \&stream_patch_parse_hdr, $ctx);
296 sub show_commit ($$) {
297 my ($ctx, $res) = @_;
298 return show_patch($ctx, $res) if ($ctx->{fn} // '') =~ /\.patch\z/;
299 my ($git, $oid) = @$res;
300 # patch-id needs two passes, and we use the initial show to ensure
301 # a patch embedded inside the commit message body doesn't get fed
303 my $cmd = [ '/bin/sh', '-c',
304 "git show --encoding=UTF-8 '$SHOW_FMT'".
305 " -z --no-notes --no-patch $oid >h && ".
306 'git show --encoding=UTF-8 --pretty=format:%n -M'.
307 " --stat -p $oid >p && ".
308 "git patch-id --stable <p" ];
309 my $e = { GIT_DIR => $git->{git_dir} };
310 my $qsp = PublicInbox::Qspawn->new($cmd, $e, { -C => "$ctx->{-tmp}" });
311 $qsp->{qsp_err} = \($ctx->{-qsp_err} = '');
312 $ctx->{env}->{'qspawn.wcb'} = delete $ctx->{-wcb};
314 $qsp->psgi_qx($ctx->{env}, undef, \&show_commit_start, $ctx);
317 sub show_other ($$) {
318 my ($ctx, $res) = @_;
319 my ($git, $oid, $type, $size) = @$res;
320 $size > $MAX_SIZE and return html_page($ctx, 200,
321 ascii_html($type)." $oid is too big to show\n". dbg_log($ctx));
322 my $cmd = ['git', "--git-dir=$git->{git_dir}",
323 qw(show --encoding=UTF-8 --no-color --no-abbrev), $oid ];
324 my $qsp = PublicInbox::Qspawn->new($cmd);
325 $qsp->{qsp_err} = \($ctx->{-qsp_err} = '');
326 $qsp->psgi_qx($ctx->{env}, undef, \&show_other_result, $ctx);
329 sub show_tree_result ($$) {
330 my ($bref, $ctx) = @_;
331 if (my $qsp_err = delete $ctx->{-qsp_err}) {
332 return html_page($ctx, 500, dbg_log($ctx) .
333 "git ls-tree -z error:$qsp_err");
335 my @ent = split(/\0/, $$bref);
336 my $qp = delete $ctx->{qp};
337 my $l = $ctx->{-linkify} //= PublicInbox::Linkify->new;
339 $$bref = "<pre><a href=#tree>tree</a> $ctx->{tree_oid}";
341 my $x = ascii_html($pfx);
343 $$bref .= qq( <a href=#path>path</a>: $x</a>\n);
346 $$bref .= qq[ (<a href=#path>path</a> unknown)\n];
348 my ($x, $m, $t, $oid, $sz, $f, $n);
349 $$bref .= "\n size name";
351 ($x, $f) = split(/\t/, $_, 2);
353 ($m, $t, $oid, $sz) = split(/ +/, $x, 4);
354 $m = $GIT_MODE{$m} // '?';
357 if ($m eq 'g') { # gitlink submodule commit
358 $$bref .= "\ng\t\t$n @ <a\nhref=#g>commit</a>$oid";
361 my $q = 'b='.ascii_html(uri_escape_path($pfx.$f));
362 if ($m eq 'd') { $n .= '/' }
363 elsif ($m eq 'x') { $n = "<b>$n</b>" }
364 elsif ($m eq 'l') { $n = "<i>$n</i>" }
365 $$bref .= qq(\n$m\t$sz\t<a\nhref="../../$oid/s/?$q">$n</a>);
367 $$bref .= dbg_log($ctx);
372 id=tree>Tree</dfn> objects belong to commits or other tree objects. Trees may
373 reference blobs, sub-trees, or commits of submodules.
376 id=path>Path</dfn> names are stored in tree objects, but trees do not know
377 their own path name. A tree's path name comes from their parent tree,
378 or it is the root tree referenced by a commit object. Thus, this web UI
379 relies on the `b=' URI parameter as a hint to display the path name.
381 <dfn title="submodule commit"
382 id=g>Commit</dfn> objects may be stored in trees to reference submodules.</pre>
385 html_page($ctx, 200, $$bref);
389 my ($ctx, $res) = @_;
390 my ($git, $oid, undef, $size) = @$res;
391 $size > $MAX_SIZE and return html_page($ctx, 200,
392 "tree $oid is too big to show\n". dbg_log($ctx));
393 my $cmd = [ 'git', "--git-dir=$git->{git_dir}",
394 qw(ls-tree -z -l --no-abbrev), $oid ];
395 my $qsp = PublicInbox::Qspawn->new($cmd);
396 $ctx->{tree_oid} = $oid;
397 $qsp->{qsp_err} = \($ctx->{-qsp_err} = '');
398 $qsp->psgi_qx($ctx->{env}, undef, \&show_tree_result, $ctx);
401 # user_cb for SolverGit, called as: user_cb->($result_or_error, $uarg)
403 my ($res, $ctx) = @_;
404 my $hints = delete $ctx->{hints};
405 $res or return html_page($ctx, 404, dbg_log($ctx));
406 ref($res) eq 'ARRAY' or return html_page($ctx, 500, dbg_log($ctx));
408 my ($git, $oid, $type, $size, $di) = @$res;
409 return show_commit($ctx, $res) if $type eq 'commit';
410 return show_tree($ctx, $res) if $type eq 'tree';
411 return show_other($ctx, $res) if $type ne 'blob';
412 my $path = to_filename($di->{path_b} // $hints->{path_b} // 'blob');
413 my $raw_link = "(<a\nhref=$path>raw</a>)";
414 if ($size > $MAX_SIZE) {
415 return stream_large_blob($ctx, $res) if defined $ctx->{fn};
416 return html_page($ctx, 200, <<EOM . dbg_log($ctx));
417 <pre><b>Too big to show, download available</b>
418 "$oid $type $size bytes $raw_link</pre>
422 my $blob = $git->cat_file($oid);
424 my $e = "Failed to retrieve generated blob ($oid)";
425 warn "$e ($git->{git_dir})";
426 return html_page($ctx, 500, "<pre><b>$e</b></pre>".dbg_log($ctx))
429 my $bin = index(substr($$blob, 0, $BIN_DETECT), "\0") >= 0;
430 if (defined $ctx->{fn}) {
431 my $h = [ 'Content-Length', $size, 'Content-Type' ];
432 push(@$h, ($bin ? 'application/octet-stream' : 'text/plain'));
433 return delete($ctx->{-wcb})->([200, $h, [ $$blob ]]);
436 $bin and return html_page($ctx, 200,
437 "<pre>$oid $type $size bytes (binary)" .
438 " $raw_link</pre>".dbg_log($ctx));
440 # TODO: detect + convert to ensure validity
441 utf8::decode($$blob);
442 my $nl = ($$blob =~ s/\r?\n/\n/sg);
443 my $pad = length($nl);
445 ($ctx->{-linkify} //= PublicInbox::Linkify->new)->linkify_1($$blob);
446 my $ok = $hl->do_hl($blob, $path) if $hl;
450 $$blob = ascii_html($$blob);
453 my $x = "<pre>$oid $type $size bytes $raw_link</pre>" .
454 "<hr /><table\nclass=blob>".
455 "<tr><td\nclass=linenumbers><pre>";
456 $x .= sprintf("<a id=n$_ href=#n$_>% ${pad}u</a>\n", $_) for (1..$nl);
457 $x .= '</pre></td><td><pre> </pre></td>'. # pad for non-CSS users
458 "<td\nclass=lines><pre\nstyle='white-space:pre'><code>";
460 # using some of the same CSS class names and ids as cgit
461 html_page($ctx, 200, $x, $ctx->{-linkify}->linkify_2($$blob),
462 '</code></pre></td></tr></table>'.dbg_log($ctx));
465 # GET /$INBOX/$GIT_OBJECT_ID/s/
466 # GET /$INBOX/$GIT_OBJECT_ID/s/$FILENAME
468 my ($ctx, $oid_b, $fn) = @_;
470 my $hints = $ctx->{hints} = {};
471 while (my ($from, $to) = each %QP_MAP) {
472 defined(my $v = $qp->{$from}) or next;
473 $hints->{$to} = $v if $v ne '';
476 $ctx->{-tmp} = File::Temp->newdir("solver.$oid_b-XXXX", TMPDIR => 1);
477 open $ctx->{lh}, '+>>', "$ctx->{-tmp}/solve.log" or die "open: $!";
478 my $solver = PublicInbox::SolverGit->new($ctx->{ibx},
479 \&solve_result, $ctx);
480 $solver->{tmp} = $ctx->{-tmp}; # share tmpdir
481 # PSGI server will call this immediately and give us a callback (-wcb)
483 $ctx->{-wcb} = $_[0]; # HTTP write callback
484 $solver->solve($ctx->{env}, $ctx->{lh}, $oid_b, $hints);