X-Git-Url: http://www.git.stargrave.org/?a=blobdiff_plain;f=lib%2FPublicInbox%2FSolverGit.pm;h=8629f0dafeb4216b41ac2c0951c866c8e76c2dcf;hb=55b707d788ce13696e4411389583e720ea6dab01;hp=8dfc52e1379d7b1ece0ae46b6b97b6d1e2a26937;hpb=2a292e40b0150f9b2d14fb3c400044047b93a151;p=public-inbox.git diff --git a/lib/PublicInbox/SolverGit.pm b/lib/PublicInbox/SolverGit.pm index 8dfc52e1..8629f0da 100644 --- a/lib/PublicInbox/SolverGit.pm +++ b/lib/PublicInbox/SolverGit.pm @@ -10,33 +10,70 @@ package PublicInbox::SolverGit; use strict; use warnings; -use File::Temp qw(); +use 5.010_001; +use File::Temp 0.19 (); # 0.19 for ->newdir use Fcntl qw(SEEK_SET); use PublicInbox::Git qw(git_unquote git_quote); -use PublicInbox::Spawn qw(spawn popen_rd); use PublicInbox::MsgIter qw(msg_iter msg_part_text); +use PublicInbox::Qspawn; +use PublicInbox::Tmpfile; use URI::Escape qw(uri_escape_utf8); -# don't bother if somebody sends us a patch with these path components, -# it's junk at best, an attack attempt at worse: -my %bad_component = map { $_ => 1 } ('', '.', '..'); +# POSIX requires _POSIX_ARG_MAX >= 4096, and xargs is required to +# subtract 2048 bytes. We also don't factor in environment variable +# headroom into this. +use POSIX qw(sysconf _SC_ARG_MAX); +my $ARG_SIZE_MAX = (sysconf(_SC_ARG_MAX) || 4096) - 2048; +my $OID_MIN = 7; + +# By default, "git format-patch" generates filenames with a four-digit +# prefix, so that means 9999 patch series are OK, right? :> +# Maybe we can make this configurable, main concern is disk space overhead +# for uncompressed patch fragments. Aside from space, public-inbox-httpd +# is otherwise unaffected by having many patches, here, as it can share +# work fairly. Other PSGI servers may have trouble, though. +my $MAX_PATCH = 9999; + +# di = diff info / a hashref with information about a diff ($di): +# { +# oid_a => abbreviated pre-image oid, +# oid_b => abbreviated post-image oid, +# tmp => anonymous file handle with the diff, +# hdr_lines => string of various header lines for mode information +# mode_a => original mode of oid_a (string, not integer), +# ibx => PublicInbox::Inbox object containing the diff +# smsg => PublicInbox::SearchMsg object containing diff +# path_a => pre-image path +# path_b => post-image path +# n => numeric path of the patch (relative to worktree) +# } -sub new { - my ($class, $gits, $inboxes) = @_; - bless { - gits => $gits, - inboxes => $inboxes, - }, $class; +sub dbg ($$) { + print { $_[0]->{out} } $_[1], "\n" or ERR($_[0], "print(dbg): $!"); } -# look for existing blobs already in git repos -sub solve_existing ($$$) { - my ($self, $out, $want) = @_; +sub done ($$) { + my ($self, $res) = @_; + my $ucb = delete($self->{user_cb}) or return; + $ucb->($res, $self->{uarg}); +} + +sub ERR ($$) { + my ($self, $err) = @_; + print { $self->{out} } $err, "\n"; + eval { done($self, $err) }; + die $err; +} + +# look for existing objects already in git repos +sub solve_existing ($$) { + my ($self, $want) = @_; my $oid_b = $want->{oid_b}; + my $have_hints = scalar keys %$want > 1; my @ambiguous; # Array of [ git, $oids] foreach my $git (@{$self->{gits}}) { my ($oid_full, $type, $size) = $git->check($oid_b); - if (defined($type) && $type eq 'blob') { + if (defined($type) && (!$have_hints || $type eq 'blob')) { return [ $git, $oid_full, $type, int($size) ]; } @@ -50,88 +87,123 @@ sub solve_existing ($$$) { # TODO: do something with the ambiguous array? # push @ambiguous, [ $git, @oids ]; - print $out "`$oid_b' ambiguous in ", - join("\n", $git->pub_urls), "\n", - join('', map { "$_ blob\n" } @oids), "\n"; + dbg($self, "`$oid_b' ambiguous in " . + join("\n\t", $git->pub_urls($self->{psgi_env})) + . "\n" . + join('', map { "$_ blob\n" } @oids)); } scalar(@ambiguous) ? \@ambiguous : undef; } -# returns a hashref with information about a diff: -# { -# oid_a => abbreviated pre-image oid, -# oid_b => abbreviated post-image oid, -# tmp => anonymous file handle with the diff, -# hdr_lines => arrayref of various header lines for mode information -# mode_a => original mode of oid_a (string, not integer), -# ibx => PublicInbox::Inbox object containing the diff -# smsg => PublicInbox::SearchMsg object containing diff -# path_a => pre-image path -# path_b => post-image path -# } -sub extract_diff ($$$$) { - my ($p, $re, $ibx, $smsg) = @_; +sub extract_diff ($$) { + my ($p, $arg) = @_; + my ($self, $diffs, $pre, $post, $ibx, $smsg) = @$arg; my ($part) = @$p; # ignore $depth and @idx; - my $hdr_lines; # diff --git a/... b/... - my $tmp; my $ct = $part->content_type || 'text/plain'; my ($s, undef) = msg_part_text($part, $ct); defined $s or return; - my $di = {}; - foreach my $l (split(/^/m, $s)) { - if ($l =~ $re) { - $di->{oid_a} = $1; - $di->{oid_b} = $2; - if (defined($3)) { - my $mode_a = $3; - if ($mode_a =~ /\A(?:100644|120000|100755)\z/) { - $di->{mode_a} = $mode_a; - } - } - - # start writing the diff out to a tempfile - open($tmp, '+>', undef) or die "open(tmp): $!"; - $di->{tmp} = $tmp; - - push @$hdr_lines, $l; - $di->{hdr_lines} = $hdr_lines; - print $tmp @$hdr_lines, $l or die "print(tmp): $!"; - - # for debugging/diagnostics: - $di->{ibx} = $ibx; - $di->{smsg} = $smsg; - } elsif ($l =~ m!\Adiff --git ("?a/.+) ("?b/.+)$!) { - return $di if $tmp; # got our blob, done! - - my ($path_a, $path_b) = ($1, $2); - - # don't care for leading 'a/' and 'b/' - my (undef, @a) = split(m{/}, git_unquote($path_a)); - my (undef, @b) = split(m{/}, git_unquote($path_b)); - - # get rid of path-traversal attempts and junk patches: - foreach (@a, @b) { - return if $bad_component{$_}; - } - - $di->{path_a} = join('/', @a); - $di->{path_b} = join('/', @b); - $hdr_lines = [ $l ]; - } elsif ($tmp) { - print $tmp $l or die "print(tmp): $!"; - } elsif ($hdr_lines) { - push @$hdr_lines, $l; - if ($l =~ /\Anew file mode (100644|120000|100755)$/) { - $di->{mode_a} = $1; - } - } + + # Email::MIME::Encodings forces QP to be CRLF upon decoding, + # change it back to LF: + my $cte = $part->header('Content-Transfer-Encoding') || ''; + if ($cte =~ /\bquoted-printable\b/i && $part->crlf eq "\n") { + $s =~ s/\r\n/\n/sg; } - $tmp ? $di : undef; + + state $LF = qr!\r?\n!; + state $ANY = qr![^\r\n]+!; + state $MODE = '100644|120000|100755'; + state $FN = qr!(?:("?[^/\n]+/[^\r\n]+)|/dev/null)!; + + $s =~ m!( # $1 start header lines we save for debugging: + + # everything before ^index is optional, but we don't + # want to match ^(old|copy|rename|deleted|...) unless + # we match /^diff --git/ first: + (?: # begin optional stuff: + + # try to get the pre-and-post filenames as $2 and $3 + (?:^diff\x20--git\x20$FN\x20$FN$LF) + + (?:^(?: # pass all this to git-apply: + # old mode $4 + (?:old\x20mode\x20($MODE)) + | + # new mode (possibly new file) ($5) + (?:new\x20(?:file\x20)?mode\x20($MODE)) + | + (?:(?:copy|rename|deleted| + dissimilarity|similarity)$ANY) + )$LF)* + + )? # end of optional stuff, everything below is required + + # match the pre and post-image OIDs as $6 $7 + ^index\x20(${pre}[a-f0-9]*)\.\.(${post}[a-f0-9]*) + # mode if unchanged $8 + (?:\x20(100644|120000|100755))?$LF + ) # end of header lines ($1) + ( # $9 is the patch body + # "--- a/foo.c" sets pre-filename ($10) in case + # $2 is missing + (?:^---\x20$FN$LF) + + # "+++ b/foo.c" sets post-filename ($11) in case + # $3 is missing + (?:^\+{3}\x20$FN$LF) + + # the meat of the diff, including "^\\No newline ..." + # We also allow for totally blank lines w/o leading spaces, + # because git-apply(1) handles that case, too + (?:^(?:[\@\+\x20\-\\][^\n]*|)$LF)+ + )!smx or return; + + my $di = { + hdr_lines => $1, + oid_a => $6, + oid_b => $7, + mode_a => $5 // $8 // $4, # new (file) // unchanged // old + }; + my $path_a = $2 // $10; + my $path_b = $3 // $11; + my $patch = $9; + + # don't care for leading 'a/' and 'b/' + my (undef, @a) = split(m{/}, git_unquote($path_a)); + my (undef, @b) = split(m{/}, git_unquote($path_b)); + + # get rid of path-traversal attempts and junk patches: + # it's junk at best, an attack attempt at worse: + state $bad_component = { map { $_ => 1 } ('', '.', '..') }; + foreach (@a, @b) { return if $bad_component->{$_} } + + $di->{path_a} = join('/', @a); + $di->{path_b} = join('/', @b); + + my $path = ++$self->{tot}; + $di->{n} = $path; + open(my $tmp, '>:utf8', $self->{tmp}->dirname . "/$path") or + die "open(tmp): $!"; + print $tmp $di->{hdr_lines}, $patch or die "print(tmp): $!"; + close $tmp or die "close(tmp): $!"; + + # for debugging/diagnostics: + $di->{ibx} = $ibx; + $di->{smsg} = $smsg; + + push @$diffs, $di; } sub path_searchable ($) { defined($_[0]) && $_[0] =~ m!\A[\w/\. \-]+\z! } -sub find_extract_diff ($$$) { +# ".." appears in path names, which confuses Xapian into treating +# it as a range query. So we split on ".." since Xapian breaks +# on punctuation anyways: +sub filename_query ($) { + join('', map { qq( dfn:"$_") } split(/\.\./, $_[0])); +} + +sub find_extract_diffs ($$$) { my ($self, $ibx, $want) = @_; my $srch = $ibx->search or return; @@ -148,38 +220,80 @@ sub find_extract_diff ($$$) { my $path_b = $want->{path_b}; if (path_searchable($path_b)) { - $q .= qq{ dfn:"$path_b"}; + $q .= filename_query($path_b); my $path_a = $want->{path_a}; if (path_searchable($path_a) && $path_a ne $path_b) { - $q .= qq{ dfn:"$path_a"}; + $q .= filename_query($path_a); } } my $msgs = $srch->query($q, { relevance => 1 }); - my $re = qr/\Aindex ($pre[a-f0-9]*)\.\.($post[a-f0-9]*)(?: (\d+))?/; - my $di; + my $diffs = []; foreach my $smsg (@$msgs) { $ibx->smsg_mime($smsg) or next; - msg_iter(delete($smsg->{mime}), sub { - $di ||= extract_diff($_[0], $re, $ibx, $smsg); - }); - return $di if $di; + my $mime = delete $smsg->{mime}; + msg_iter($mime, \&extract_diff, + [$self, $diffs, $pre, $post, $ibx, $smsg]); + } + @$diffs ? $diffs : undef; +} + +sub update_index_result ($$) { + my ($bref, $self) = @_; + my ($qsp, $msg) = delete @$self{qw(-qsp -msg)}; + if (my $err = $qsp->{err}) { + ERR($self, "git update-index error: $err"); } + dbg($self, $msg); + next_step($self); # onto do_git_apply +} + +sub prepare_index ($) { + my ($self) = @_; + my $patches = $self->{patches}; + $self->{nr} = 0; + + my $di = $patches->[0] or die 'no patches'; + my $oid_a = $di->{oid_a} or die '{oid_a} unset'; + my $existing = $self->{found}->{$oid_a}; + + # no index creation for added files + $oid_a =~ /\A0+\z/ and return next_step($self); + + die "BUG: $oid_a not not found" unless $existing; + + my $oid_full = $existing->[1]; + my $path_a = $di->{path_a} or die "BUG: path_a missing for $oid_full"; + my $mode_a = $di->{mode_a} // '100644'; + + my $in = tmpfile("update-index.$oid_full") or die "tmpfile: $!"; + print $in "$mode_a $oid_full\t$path_a\0" or die "print: $!"; + $in->flush or die "flush: $!"; + sysseek($in, 0, 0) or die "seek: $!"; + + dbg($self, 'preparing index'); + my $rdr = { 0 => $in }; + my $cmd = [ qw(git update-index -z --index-info) ]; + my $qsp = PublicInbox::Qspawn->new($cmd, $self->{git_env}, $rdr); + $path_a = git_quote($path_a); + $self->{-qsp} = $qsp; + $self->{-msg} = "index prepared:\n$mode_a $oid_full\t$path_a"; + $qsp->psgi_qx($self->{psgi_env}, undef, \&update_index_result, $self); } # pure Perl "git init" -sub do_git_init_wt ($) { +sub do_git_init ($) { my ($self) = @_; - my $wt = File::Temp->newdir('solver.wt-XXXXXXXX', TMPDIR => 1); - my $dir = $wt->dirname; + my $dir = $self->{tmp}->dirname; + my $git_dir = "$dir/git"; foreach ('', qw(objects refs objects/info refs/heads)) { - mkdir("$dir/.git/$_") or die "mkdir $_: $!"; + mkdir("$git_dir/$_") or die "mkdir $_: $!"; } - open my $fh, '>', "$dir/.git/config" or die "open .git/config: $!"; - print $fh <<'EOF' or die "print .git/config $!"; + open my $fh, '>', "$git_dir/config" or die "open git/config: $!"; + print $fh <<'EOF' or die "print git/config $!"; [core] repositoryFormatVersion = 0 filemode = true @@ -187,238 +301,326 @@ sub do_git_init_wt ($) { fsyncObjectfiles = false logAllRefUpdates = false EOF - close $fh or die "close .git/config: $!"; + close $fh or die "close git/config: $!"; - open $fh, '>', "$dir/.git/HEAD" or die "open .git/HEAD: $!"; - print $fh "ref: refs/heads/master\n" or die "print .git/HEAD: $!"; - close $fh or die "close .git/HEAD: $!"; + open $fh, '>', "$git_dir/HEAD" or die "open git/HEAD: $!"; + print $fh "ref: refs/heads/master\n" or die "print git/HEAD: $!"; + close $fh or die "close git/HEAD: $!"; - my $f = '.git/objects/info/alternates'; - open $fh, '>', "$dir/$f" or die "open: $f: $!"; - print($fh (map { "$_->{git_dir}/objects\n" } @{$self->{gits}})) or - die "print $f: $!"; + my $f = 'objects/info/alternates'; + open $fh, '>', "$git_dir/$f" or die "open: $f: $!"; + foreach my $git (@{$self->{gits}}) { + print $fh $git->git_path('objects'),"\n" or die "print $f: $!"; + } close $fh or die "close: $f: $!"; - $wt; + my $tmp_git = $self->{tmp_git} = PublicInbox::Git->new($git_dir); + $tmp_git->{-tmp} = $self->{tmp}; + $self->{git_env} = { + GIT_DIR => $git_dir, + GIT_INDEX_FILE => "$git_dir/index", + }; + prepare_index($self); } -sub extract_old_mode ($) { - my ($di) = @_; - if (grep(/\Aold mode (100644|100755|120000)$/, @{$di->{hdr_lines}})) { - return $1; +sub do_finish ($) { + my ($self) = @_; + my ($found, $oid_want) = @$self{qw(found oid_want)}; + if (my $exists = $found->{$oid_want}) { + return done($self, $exists); } - '100644'; -} -sub reap ($$) { - my ($pid, $msg) = @_; - waitpid($pid, 0) == $pid or die "waitpid($msg): $!"; - $? == 0 or die "$msg failed: $?"; + # let git disambiguate if oid_want was too short, + # but long enough to be unambiguous: + my $tmp_git = $self->{tmp_git}; + if (my @res = $tmp_git->check($oid_want)) { + return done($self, $found->{$res[0]}); + } + if (my $err = $tmp_git->last_check_err) { + dbg($self, $err); + } + done($self, undef); } -sub prepare_index ($$$$) { - my ($out, $wt_dir, $existing, $di) = @_; - my $oid_full = $existing->[1]; - my ($r, $w); - my $path_a = $di->{path_a} or die "BUG: path_a missing for $oid_full"; - my $mode_a = $di->{mode_a} || extract_old_mode($di); - my @git = (qw(git -C), $wt_dir); - - pipe($r, $w) or die "pipe: $!"; - my $rdr = { 0 => fileno($r) }; - my $pid = spawn([@git, qw(update-index -z --index-info)], {}, $rdr); - close $r or die "close pipe(r): $!"; - print $w "$mode_a $oid_full\t$path_a\0" or die "print update-index: $!"; +sub event_step ($) { + my ($self) = @_; + eval { + # step 1: resolve blobs to patches in the todo queue + if (my $want = pop @{$self->{todo}}) { + # this populates {patches} and {todo} + resolve_patch($self, $want); + + # step 2: then we instantiate a working tree once + # the todo queue is finally empty: + } elsif (!defined($self->{tmp_git})) { + do_git_init($self); + + # step 3: apply each patch in the stack + } elsif (scalar @{$self->{patches}}) { + do_git_apply($self); + + # step 4: execute the user-supplied callback with + # our result: (which may be undef) + # Other steps may call user_cb to terminate prematurely + # on error + } elsif (exists $self->{user_cb}) { + do_finish($self); + } else { + die 'about to call user_cb twice'; # Oops :x + } + }; # eval + my $err = $@; + if ($err) { + $err =~ s/^\s*Exception:\s*//; # bad word to show users :P + dbg($self, "E: $err"); + eval { done($self, $err) }; + } +} - close $w or die "close update-index: $!"; - reap($pid, 'update-index -z --index-info'); +sub next_step ($) { + my ($self) = @_; + # if outside of public-inbox-httpd, caller is expected to be + # looping event_step, anyways + my $async = $self->{psgi_env}->{'pi-httpd.async'} or return; + # PublicInbox::HTTPD::Async->new + $async->(undef, undef, $self); +} - print $out "index prepared:\n", - "$mode_a $oid_full\t", git_quote($path_a), "\n"; +sub mark_found ($$$) { + my ($self, $oid, $found_info) = @_; + my $found = $self->{found}; + $found->{$oid} = $found_info; + my $oid_cur = $found_info->[1]; + while ($oid_cur ne $oid && length($oid_cur) > $OID_MIN) { + $found->{$oid_cur} = $found_info; + chop($oid_cur); + } } -sub do_apply ($$$$) { - my ($out, $wt_git, $wt_dir, $di) = @_; +sub parse_ls_files ($$) { + my ($self, $bref) = @_; + my ($qsp, $di) = delete @$self{qw(-qsp -cur_di)}; + if (my $err = $qsp->{err}) { + die "git ls-files error: $err"; + } - my $tmp = delete $di->{tmp} or die "BUG: no tmp ", di_url($di); - $tmp->flush or die "tmp->flush failed: $!"; - $out->flush or die "err->flush failed: $!"; - sysseek($tmp, 0, SEEK_SET) or die "sysseek(tmp) failed: $!"; + my ($line, @extra) = split(/\0/, $$bref); + scalar(@extra) and die "BUG: extra files in index: <", + join('> <', @extra), ">"; - defined(my $err_fd = fileno($out)) or die "fileno(out): $!"; - my $rdr = { 0 => fileno($tmp), 1 => $err_fd, 2 => $err_fd }; - my $cmd = [ qw(git -C), $wt_dir, - qw(apply --cached --whitespace=warn --verbose) ]; - reap(spawn($cmd, undef, $rdr), 'apply'); + my ($info, $file) = split(/\t/, $line, 2); + my ($mode_b, $oid_b_full, $stage) = split(/ /, $info); + if ($file ne $di->{path_b}) { + die +"BUG: index mismatch: file=$file != path_b=$di->{path_b}"; + } - local $/ = "\0"; - my $rd = popen_rd([qw(git -C), $wt_dir, qw(ls-files -s -z)]); + my $tmp_git = $self->{tmp_git} or die 'no git working tree'; + my (undef, undef, $size) = $tmp_git->check($oid_b_full); + defined($size) or die "check $oid_b_full failed"; - defined(my $line = <$rd>) or die "failed to read ls-files: $!"; - chomp $line or die "no trailing \\0 in [$line] from ls-files"; + dbg($self, "index at:\n$mode_b $oid_b_full\t$file"); + my $created = [ $tmp_git, $oid_b_full, 'blob', $size, $di ]; + mark_found($self, $di->{oid_b}, $created); + next_step($self); # onto the next patch +} - my ($info, $file) = split(/\t/, $line, 2); - my ($mode_b, $oid_b_full, $stage) = split(/ /, $info); +sub ls_files_result { + my ($bref, $self) = @_; + eval { parse_ls_files($self, $bref) }; + ERR($self, $@) if $@; +} - defined($line = <$rd>) and die "extra files in index: $line"; - close $rd or die "close ls-files: $?"; +sub oids_same_ish ($$) { + (index($_[0], $_[1]) == 0) || (index($_[1], $_[0]) == 0); +} - $file eq $di->{path_b} or - die "index mismatch: file=$file != path_b=$di->{path_b}"; +sub skip_identical ($$$) { + my ($self, $patches, $cur_oid_b) = @_; + while (my $nxt = $patches->[0]) { + if (oids_same_ish($cur_oid_b, $nxt->{oid_b})) { + dbg($self, 'skipping '.di_url($self, $nxt). + " for $cur_oid_b"); + shift @$patches; + } else { + return; + } + } +} - my (undef, undef, $size) = $wt_git->check($oid_b_full); +sub apply_result ($$) { + my ($bref, $self) = @_; + my ($qsp, $di) = delete @$self{qw(-qsp -cur_di)}; + dbg($self, $$bref); + my $patches = $self->{patches}; + if (my $err = $qsp->{err}) { + my $msg = "git apply error: $err"; + my $nxt = $patches->[0]; + if ($nxt && oids_same_ish($nxt->{oid_b}, $di->{oid_b})) { + dbg($self, $msg); + dbg($self, 'trying '.di_url($self, $nxt)); + return do_git_apply($self); + } else { + ERR($self, $msg); + } + } else { + skip_identical($self, $patches, $di->{oid_b}); + } - defined($size) or die "failed to read_size from $oid_b_full"; + my @cmd = qw(git ls-files -s -z); + $qsp = PublicInbox::Qspawn->new(\@cmd, $self->{git_env}); + $self->{-cur_di} = $di; + $self->{-qsp} = $qsp; + $qsp->psgi_qx($self->{psgi_env}, undef, \&ls_files_result, $self); +} - print $out "$mode_b $oid_b_full\t$file\n"; - [ $wt_git, $oid_b_full, 'blob', $size, $di ]; +sub do_git_apply ($) { + my ($self) = @_; + my $dn = $self->{tmp}->dirname; + my $patches = $self->{patches}; + + # we need --ignore-whitespace because some patches are CRLF + my @cmd = (qw(git apply --cached --ignore-whitespace + --unidiff-zero --whitespace=warn --verbose)); + my $len = length(join(' ', @cmd)); + my $total = $self->{tot}; + my $di; # keep track of the last one for "git ls-files" + my $prv_oid_b; + + do { + my $i = ++$self->{nr}; + $di = shift @$patches; + dbg($self, "\napplying [$i/$total] " . di_url($self, $di) . + "\n" . $di->{hdr_lines}); + my $path = $di->{n}; + $len += length($path) + 1; + push @cmd, $path; + $prv_oid_b = $di->{oid_b}; + } while (@$patches && $len < $ARG_SIZE_MAX && + !oids_same_ish($patches->[0]->{oid_b}, $prv_oid_b)); + + my $opt = { 2 => 1, -C => $dn, quiet => 1 }; + my $qsp = PublicInbox::Qspawn->new(\@cmd, $self->{git_env}, $opt); + $self->{-cur_di} = $di; + $self->{-qsp} = $qsp; + $qsp->psgi_qx($self->{psgi_env}, undef, \&apply_result, $self); } -sub di_url ($) { - my ($di) = @_; - # note: we don't pass the PSGI env here, different inboxes - # can have different HTTP_HOST on the same instance. - my $url = $di->{ibx}->base_url; +sub di_url ($$) { + my ($self, $di) = @_; + # note: we don't pass the PSGI env unconditionally, here, + # different inboxes can have different HTTP_HOST on the same instance. + my $ibx = $di->{ibx}; + my $env = $self->{psgi_env} if $ibx eq $self->{inboxes}->[0]; + my $url = $ibx->base_url($env); my $mid = $di->{smsg}->{mid}; - defined($url) ? "<$url$mid/>" : "<$mid>"; + defined($url) ? "$url$mid/" : "<$mid>"; } -sub apply_patches ($$$$$) { - my ($self, $out, $wt, $found, $patches) = @_; - my $wt_dir = $wt->dirname; - my $wt_git = PublicInbox::Git->new("$wt_dir/.git"); - $wt_git->{-wt} = $wt; - - my $cur = 0; - my $tot = scalar @$patches; +sub resolve_patch ($$) { + my ($self, $want) = @_; - foreach my $di (@$patches) { - my $i = ++$cur; - my $oid_a = $di->{oid_a}; - my $existing = $found->{$oid_a}; - my $empty_oid = $oid_a =~ /\A0+\z/; + if (scalar(@{$self->{patches}}) > $MAX_PATCH) { + die "Aborting, too many steps to $self->{oid_want}"; + } - if ($empty_oid && $i != 1) { - die "empty oid at [$i/$tot] ", di_url($di); - } - if (!$existing && !$empty_oid) { - die "missing $oid_a at [$i/$tot] ", di_url($di); + # see if we can find the blob in an existing git repo: + my $cur_want = $want->{oid_b}; + if ($self->{seen_oid}->{$cur_want}++) { + die "Loop detected solving $cur_want\n"; + } + if (my $existing = solve_existing($self, $want)) { + my ($found_git, undef, $type, undef) = @$existing; + dbg($self, "found $cur_want in " . + join("\n", $found_git->pub_urls($self->{psgi_env}))); + + if ($cur_want eq $self->{oid_want} || $type ne 'blob') { + eval { done($self, $existing) }; + die "E: $@" if $@; + return; } + mark_found($self, $cur_want, $existing); + return next_step($self); # onto patch application + } - # prepare the worktree for patch application: - if ($i == 1 && $existing) { - prepare_index($out, $wt_dir, $existing, $di); - } + # scan through inboxes to look for emails which results in + # the oid we want: + foreach my $ibx (@{$self->{inboxes}}) { + my $diffs = find_extract_diffs($self, $ibx, $want) or next; - print $out "\napplying [$i/$tot] ", di_url($di), "\n", - join('', @{$di->{hdr_lines}}), "\n" - or die "print \$out failed: $!"; + unshift @{$self->{patches}}, @$diffs; + dbg($self, "found $cur_want in ". + join("\n\t", map { di_url($self, $_) } @$diffs)); - # apply the patch! - $found->{$di->{oid_b}} = do_apply($out, $wt_git, $wt_dir, $di); - } -} + # good, we can find a path to the oid we $want, now + # lets see if we need to apply more patches: + my $di = $diffs->[0]; + my $src = $di->{oid_a}; -sub dump_found ($$) { - my ($out, $found) = @_; - foreach my $oid (sort keys %$found) { - my ($git, $oid, undef, undef, $di) = @{$found->{$oid}}; - my $loc = $di ? di_url($di) : $git->src_blob_url($oid); - print $out "$oid from $loc\n"; + unless ($src =~ /\A0+\z/) { + # we have to solve it using another oid, fine: + my $job = { oid_b => $src, path_b => $di->{path_a} }; + push @{$self->{todo}}, $job; + } + return next_step($self); # onto the next todo item } -} - -sub dump_patches ($$) { - my ($out, $patches) = @_; - my $tot = scalar(@$patches); - my $i = 0; - foreach my $di (@$patches) { - ++$i; - print $out "[$i/$tot] ", di_url($di), "\n"; + if (length($cur_want) > $OID_MIN) { + chop($cur_want); + dbg($self, "retrying $want->{oid_b} as $cur_want"); + $want->{oid_b} = $cur_want; + push @{$self->{todo}}, $want; + return next_step($self); # retry with shorter abbrev } + + dbg($self, "could not find $cur_want"); + eval { done($self, undef) }; + die "E: $@" if $@; } -# recreate $oid_b -# Returns a 2-element array ref: [ PublicInbox::Git object, oid_full ] -# or undef if nothing was found. -sub solve ($$$$) { - my ($self, $out, $oid_b, $hints) = @_; +# this API is designed to avoid creating self-referential structures; +# so user_cb never references the SolverGit object +sub new { + my ($class, $ibx, $user_cb, $uarg) = @_; - # should we even get here? Probably not, but somebody - # could be manually typing URLs: - return if $oid_b =~ /\A0+\z/; - - my $req = { %$hints, oid_b => $oid_b }; - my @todo = ($req); - my $found = {}; # { abbrev => [ ::Git, oid_full, type, size, $di ] } - my $patches = []; # [ array of $di hashes ] - - my $max = $self->{max_steps} || 200; - my $steps = 0; - - while (defined(my $want = pop @todo)) { - # see if we can find the blob in an existing git repo: - if (my $existing = solve_existing($self, $out, $want)) { - my $want_oid = $want->{oid_b}; - if ($want_oid eq $oid_b) { # DONE! - my @pub_urls = $existing->[0]->pub_urls; - print $out "found $want_oid in ", - join("\n", @pub_urls),"\n"; - return $existing; - } - - $found->{$want_oid} = $existing; - next; # ok, one blob resolved, more to go? - } + bless { + gits => $ibx->{-repo_objs}, + user_cb => $user_cb, + uarg => $uarg, + # -cur_di, -qsp, -msg => temporary fields for Qspawn callbacks - # scan through inboxes to look for emails which results in - # the oid we want: - foreach my $ibx (@{$self->{inboxes}}) { - my $di = find_extract_diff($self, $ibx, $want) or next; - - unshift @$patches, $di; - - # good, we can find a path to the oid we $want, now - # lets see if we need to apply more patches: - my $src = $di->{oid_a}; - if ($src !~ /\A0+\z/) { - if (++$steps > $max) { - print $out -"Aborting, too many steps to $oid_b\n"; - - return; - } - - # we have to solve it using another oid, fine: - my $job = { - oid_b => $src, - path_b => $di->{path_a}, - }; - push @todo, $job; - } - last; # onto the next @todo item - } - } + # TODO: config option for searching related inboxes + inboxes => [ $ibx ], + }, $class; +} - unless (scalar(@$patches)) { - print $out "no patch(es) for $oid_b\n"; - dump_found($out, $found); - return; - } +# recreate $oid_want using $hints +# hints keys: path_a, path_b, oid_a +# Calls {user_cb} with: [ ::Git object, oid_full, type, size, di (diff_info) ] +# with found object, or undef if nothing was found +# Calls {user_cb} with a string error on fatal errors +sub solve ($$$$$) { + my ($self, $env, $out, $oid_want, $hints) = @_; - # reconstruct the oid_b blob using patches we found: - eval { - my $wt = do_git_init_wt($self); - apply_patches($self, $out, $wt, $found, $patches); - }; - if ($@) { - print $out "E: $@\nfound: "; - dump_found($out, $found); - print $out "patches: "; - dump_patches($out, $patches); - return; + # should we even get here? Probably not, but somebody + # could be manually typing URLs: + return done($self, undef) if $oid_want =~ /\A0+\z/; + + $self->{oid_want} = $oid_want; + $self->{out} = $out; + $self->{seen_oid} = {}; + $self->{tot} = 0; + $self->{psgi_env} = $env; + $self->{todo} = [ { %$hints, oid_b => $oid_want } ]; + $self->{patches} = []; # [ $di, $di, ... ] + $self->{found} = {}; # { abbr => [ ::Git, oid, type, size, $di ] } + $self->{tmp} = File::Temp->newdir("solver.$oid_want-XXXXXXXX", TMPDIR => 1); + + dbg($self, "solving $oid_want ..."); + if (my $async = $env->{'pi-httpd.async'}) { + # PublicInbox::HTTPD::Async->new + $async->(undef, undef, $self); + } else { + event_step($self) while $self->{user_cb}; } - - $found->{$oid_b}; } 1;