git-remote-gpg

   1 #!/usr/bin/perl
   2 our $VERSION = '2014.01.28';
   3 # License
   4         # This file is a git-remote-helpers(1) to use a gpg(1)
   5         # as a cryptographic layer below git(1)'s objects.
   6         # Copyright (C) 2014  Julien Moutinho
   7         #
   8         # This program is free software: you can redistribute it and/or modify
   9         # it under the terms of the GNU General Public License as published
  10         # by the Free Software Foundation, either version 3 of the License,
  11         # or any later version.
  12         #
  13         # This program is distributed in the hope that it will be useful,
  14         # but WITHOUT ANY WARRANTY; without even the implied warranty
  15         # of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  16         # See the GNU General Public License for more details.
  17         #
  18         # You should have received a copy of the GNU General Public License
  19         # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 # Dependencies
  21         use strict;
  22         use warnings FATAL => qw(all);
  23         use Carp;
  24         use Cwd;
  25         use File::Basename;
  26         use File::Copy;
  27         use File::Path;
  28         use File::Spec::Functions qw(:ALL);
  29         use File::Temp;
  30         use Getopt::Long;
  31         use IPC::Run;
  32                 # NOTE: to debug: IPCRUNDEBUG=basic|data|details|gory
  33         use IO::Handle;
  34         use JSON;
  35         use POSIX qw(WNOHANG);
  36         use URI;
  37
  38         require Pod::Usage;
  39         require Data::Dumper;
  40 # Trace utilities
  41         sub trace (@) {
  42                 foreach my $msg (@_) {
  43                         print STDERR $msg
  44                                 if defined $msg;
  45                  }
  46          }
  47         sub debug (@) {
  48                 my $call = (caller(1))[3];
  49                 if ($ENV{TRACE}) {
  50                         trace
  51                          ( "\e[35mDEBUG\e[m"
  52                          , "\e[30m\e[1m.", join('.', $call."\e[m")
  53                          , " ", (map {
  54                                 ref $_ eq 'CODE'
  55                                  ? $_->()
  56                                  : Data::Dumper::Dumper($_)
  57                                 } @_)
  58                          );
  59                  }
  60                 return 1;
  61          }
  62         sub info (@) {
  63                 my $call = (caller(1))[3];
  64                 trace
  65                  ( "\e[32mINFO\e[m"
  66                  , "\e[30m\e[1m.", join('.', $call."\e[m")
  67                  , " ", (ref $_ eq 'CODE'?(join("\n      ", $_->()), "\n"):(@_, "\n"))
  68                  );
  69          }
  70         sub warning (@) {
  71                 local $Carp::CarpLevel = 1;
  72                 carp("\e[33mWARNING\e[m ", @_, "\n\t");
  73          }
  74         sub error (@) {
  75                 local $Carp::CarpLevel = 1;
  76                 croak("\e[31mERROR\e[m ", @_, "\n\t");
  77          }
  78 # System utilities
  79         sub rm (@) {
  80                 foreach my $file (@_) {
  81                         debug(sub{"file=$file\n"});
  82                         if (not -e $file) {
  83                                 unlink($file)
  84                                         or error("rm $file");
  85                          }
  86                  }
  87          }
  88         sub mkdir (@) {
  89                 foreach my $dir (@_) {
  90                         debug(sub{"dir=$dir\n"});
  91                         File::Path::make_path($dir, {verbose=>0, error => \my $error});
  92                         if (@$error) {
  93                                 for my $diag (@$error) {
  94                                         my ($dir, $message) = %$diag;
  95                                         error("dir=$dir: $message");
  96                                  }
  97                          }
  98                  }
  99          }
 100 # grg crypto
 101         sub grg_rand ($$) {
 102                 my ($ctx, $size) = @_;
 103                 local $_;
 104                 IPC::Run::run([@{$ctx->{config}->{gpg}}
 105                  , '--armor', '--gen-rand', '1', $size]
 106                  , '>', \$_)
 107                         or error("failed to get random bits");
 108                 chomp;
 109                 return $_;
 110          }
 111         sub grg_hash ($$;$) {
 112                 my ($ctx, $algo, $run) = @_;
 113                 $run = sub {return @_} unless defined $run;
 114                 my $hash;
 115                 IPC::Run::run($run->([@{$ctx->{config}->{gpg}}
 116                  , '--with-colons', '--print-md', $algo]
 117                  , '>', \$hash))
 118                         or error("failed to hash data");
 119                 return ((split(':', $hash))[2]);
 120          }
 121         sub gpg_fingerprint($$$) {
 122                 my ($ctx, $id, $caps_needed) = @_;
 123                 my ($output);
 124                 my %h = ();
 125                 if (IPC::Run::run([@{$ctx->{config}->{gpg}}
 126                  , '--fixed-list-mode', '--with-colons', '--with-fingerprint', '--list-keys', $id]
 127                  , '>', \$output)) {
 128                         my @lines = split(/\n/,$output);
 129                         while (my $line = shift @lines) {
 130                                 if (my ($longkeyid, $caps) = $line =~ m/^pub:[^:]*:[^:]*:[^:]*:([^:]*):[^:]*:[^:]*:[^:]*:[^:]*:[^:]*:[^:]*:([^:]+):.*$/) {
 131                                         my $skip = 0;
 132                                         foreach my $cap (@$caps_needed) {
 133                                                 if (not ($caps =~ m/$cap/)) {
 134                                                         warning("skipping key 0x$longkeyid which has not usable capability: $cap, but matches: `$id'");
 135                                                         $skip = 1;
 136                                                  }
 137                                          }
 138                                         if (not $skip) {
 139                                                 my $fpr = undef;
 140                                                 my $uid = undef;
 141                                                 while ((not defined $fpr or not defined $uid)
 142                                                  and $line = shift @lines) {
 143                                                         (not defined $fpr and (($fpr) = $line =~ m/^fpr:[^:]*:[^:]*:[^:]*:[^:]*:[^:]*:[^:]*:[^:]*:[^:]*:([0-9A-F]+):.*$/)) or
 144                                                         (not defined $uid and (($uid) = $line =~ m/^uid:[^:]*:[^:]*:[^:]*:[^:]*:[^:]*:[^:]*:[^:]*:[^:]*:([^:]+):.*$/)) or
 145                                                         1;
 146                                                  }
 147                                                 error("unable to extract fingerprint and user ID")
 148                                                         unless defined $fpr
 149                                                         and    defined $uid;
 150                                                 $h{$fpr} = $uid;
 151                                          }
 152                                  }
 153                          }
 154                  }
 155                 error("unable to find any OpenPGP key with usable capability: ".join('', @$caps_needed)." for: `$id'")
 156                         unless scalar(%h) gt 0;
 157                 debug(sub{"$id -> "}, \%h);
 158                 return %h;
 159          }
 160         sub grg_encrypt_symmetric ($$$;$) {
 161                 my ($ctx, $clear, $key, $run) = @_;
 162                 $run = sub {return @_} unless defined $run;
 163                 IPC::Run::run($run->([@{$ctx->{config}->{gpg}}
 164                  , '--batch', '--yes'
 165                  , '--compress-algo', 'none'
 166                  , '--force-mdc'
 167                  , '--passphrase-fd', '3'
 168                  , '--s2k-mode', '1'
 169                  , '--trust-model', 'always'
 170                  , '--symmetric']
 171                  , '<', \$clear, '3<', \$key))
 172                         or error("failed to encrypt symmetrically data");
 173          }
 174         sub grg_decrypt_symmetric ($$$;$) {
 175                 my ($ctx, $key, $run) = @_;
 176                 debug(sub{'ctx='}, $ctx);
 177                 debug(sub{'key='}, $key);
 178                 $run = sub {return @_} unless defined $run;
 179                 IPC::Run::run($run->([@{$ctx->{config}->{gpg}}
 180                  , '--batch', '--no-default-keyring', '--keyring', '/dev/null', '--secret-keyring', '/dev/null'
 181                  , '--passphrase-fd', '3', '--quiet', '--decrypt']
 182                  , '3<', \$key))
 183                         or error("failed to decrypt symmetrically data");
 184          }
 185         sub grg_encrypt_asymmetric ($$;$) {
 186                 my ($ctx, $clear, $run) = @_;
 187                 $run = sub {return @_} unless defined $run;
 188                 my @recipients =
 189                  ( (map { ('--recipient', '0x'.$_) } (keys %{$ctx->{config}->{keys}}))
 190                  , (map { ('--hidden-recipient', '0x'.$_) } (keys %{$ctx->{config}->{'hidden-keys'}})) );
 191                 @recipients = ('--default-recipient-self')
 192                         if @recipients == 0;
 193                 IPC::Run::run($run->([@{$ctx->{config}->{gpg}}
 194                  , '--batch', '--yes'
 195                  , '--compress-algo', 'none'
 196                  , '--trust-model', 'always'
 197                  , '--sign', '--encrypt'
 198                  , ($ctx->{config}->{signingkey}->{fpr} ? ('--local-user', $ctx->{config}->{signingkey}->{fpr}) : ())
 199                  , @recipients ]
 200                  , '<', \$clear))
 201                         or error("failed to encrypt asymmetrically data");
 202          }
 203         sub grg_decrypt_asymmetric ($$;$) {
 204                 my ($ctx, $run) = @_;
 205                 my ($clear, $status);
 206                 $run = sub {return @_} unless defined $run;
 207                 IPC::Run::run($run->([@{$ctx->{config}->{gpg}}
 208                  , '--batch', '--no-default-keyring',
 209                  , '--status-fd', '3', '--quiet', '--decrypt']
 210                  , '>', \$clear, '3>', \$status))
 211                         or error("failed to decrypt asymmetrically data");
 212                 debug(sub{"status=\n$status"});
 213                 my @lines = split(/\n/,$status);
 214                 my ($enc_to, $goodsig, $validsig, $validpub, $goodmdc);
 215                 foreach my $line (@lines) {
 216                         (not defined $enc_to and (($enc_to)   = $line =~ m/^\[GNUPG:\] ENC_TO ([0-9A-F]+).*$/)) or
 217                         (not defined $goodsig and (($goodsig) = $line =~ m/^\[GNUPG:\] GOODSIG ([0-9A-F]+).*$/)) or
 218                         (not defined $goodmdc and (($goodmdc) = $line =~ m/^\[GNUPG:\] (GOODMDC)$/)) or
 219                         (not defined $validsig and not defined $validpub and (($validsig, $validpub)
 220                                  = $line =~ m/^\[GNUPG:\] VALIDSIG ([0-9A-F]+) [^ ]+ [^ ]+ [^ ]+ [^ ]+ [^ ]+ [^ ]+ [^ ]+ [^ ]+ ([0-9A-F]+).*$/)) or
 221                         1;
 222                  }
 223                 error("data expected to be encrypted")
 224                         unless $enc_to;
 225                 debug(sub{"enc_to=$enc_to\n"});
 226                 error("data expected to be signed")
 227                         unless $goodsig;
 228                 debug(sub{"goodsig=$goodsig\n"});
 229                 error("modification detection code incorrect")
 230                         unless $goodmdc;
 231                 debug(sub{"good_mdc=$goodmdc\n"});
 232                 error("data signature invalid")
 233                         unless $validsig and $validpub;
 234                 debug(sub{"validsig=$validsig\n"});
 235                 debug(sub{"validpub=$validpub\n"});
 236                 error("data signature refused")
 237                         unless exists $ctx->{config}->{keys}->{$validpub}
 238                         or exists $ctx->{config}->{'hidden-keys'}->{$validpub};
 239                 debug(sub{"accepted:$validpub\n"});
 240                 return $clear;
 241          }
 242 # grg remote I/O
 243         sub grg_remote_fetch_file ($) {
 244                 my ($ctx) = @_;
 245                 # NOTE: avoid File::Copy::copy().
 246                 while (my ($file, undef) = each %{$ctx->{remote}->{fetch}}) {
 247                         my $path = File::Spec->catfile($ctx->{remote}->{uri}->file, $file);
 248                         if (-r $path) {
 249                                 my $h = $ctx->{remote}->{fetch}->{$file};
 250                                 $h->{path}     = $path;
 251                                 $h->{preserve} = 1;
 252                          }
 253                         else { return 0; }
 254                  }
 255                 return 1;
 256          }
 257         sub grg_remote_fetch_rsync ($) {
 258                 my ($ctx) = @_;
 259                 my $uri  = $ctx->{remote}->{uri}->clone;
 260                 my @src;
 261                 if ($uri->opaque =~ m{^//}) {
 262                         $uri->fragment(undef);
 263                         $uri->query(undef);
 264                         @src = map { $uri->path($_); $uri->as_string; }
 265                          (keys %{$ctx->{remote}->{fetch}});
 266                  }
 267                 else {
 268                         my ($authority, $path, $fragment)
 269                          = $uri->as_string =~ m|^rsync:(?:([^/#:]+):)?([^?#]*)(?:#(.*))?$|;
 270                         @src = map { "$authority:$path/$_" }
 271                          (keys %{$ctx->{remote}->{fetch}});
 272                  }
 273                 IPC::Run::run([@{$ctx->{config}->{rsync}}
 274                  , '-i', '--ignore-times', '--inplace', '--progress'
 275                  , @src
 276                  , $ctx->{'dir-cache'}.'/']
 277                  , '>&2')
 278          }
 279         sub grg_remote_fetch_sftp ($) {
 280                 my ($ctx) = @_;
 281                 IPC::Run::run([@{$ctx->{config}->{curl}}
 282                  , '--show-error'
 283                  , '--output', File::Spec->catfile($ctx->{'dir-cache'}, '#1')
 284                  , File::Spec->catfile($ctx->{remote}->{uri}->as_string
 285                          , '{'.join(',', (keys %{$ctx->{remote}->{fetch}})).'}') ])
 286          }
 287         sub grg_remote_fetch ($$) {
 288                 my ($ctx, $files) = @_;
 289                 debug(sub{'files='}, $files);
 290                 my $scheme = $ctx->{remote}->{uri}->scheme;
 291                 $ctx->{remote}->{fetch}
 292                  = {map { $_ =>
 293                          { path => File::Spec->catfile($ctx->{'dir-cache'}, $_)
 294                          , preserve => 0 }
 295                  } @$files};
 296                 my $fct =
 297                  { file  => \&grg_remote_fetch_file
 298                  , rsync => \&grg_remote_fetch_rsync
 299                  , sftp  => \&grg_remote_fetch_sftp
 300                  }->{$scheme};
 301                 error("URL scheme not supported: `$scheme'")
 302                         unless $fct;
 303                 $fct->($ctx)
 304                         or $ctx->{remote}->{fetch} = {};
 305                 return $ctx->{remote}->{fetch};
 306          }
 307         sub grg_remote_init_file ($) {
 308                 my ($ctx) = @_;
 309                 my $dst = $ctx->{remote}->{uri}->file;
 310                 &mkdir($dst);
 311                 return 1;
 312          }
 313         sub grg_remote_init_rsync ($) {
 314                 my ($ctx) = @_;
 315                 my $tmp = File::Temp->tempdir('grg_rsync_XXXXXXXX', CLEANUP => 1);
 316                 my $uri = $ctx->{remote}->{uri}->clone;
 317                 my ($path, $dst);
 318                 if ($uri->opaque =~ m{^//}) {
 319                         $uri->fragment(undef);
 320                         $uri->query(undef);
 321                         $path = $uri->path;
 322                         $dst = $uri->as_string;
 323                  }
 324                 else {
 325                         my ($authority, $fragment);
 326                         ($authority, $path, $fragment)
 327                          = $uri->as_string =~ m|^rsync:(?:([^/#:]+):)?([^?#]*)(?:#(.*))?$|;
 328                         $dst = "$authority:";
 329                  }
 330                 &mkdir(File::Spec->catdir($tmp, $path));
 331                 IPC::Run::run([@{$ctx->{config}->{rsync}}
 332                  , '-i', '--recursive', '--relative'
 333                  , '--exclude=*', '.'
 334                  , $dst]
 335                  , '>&2'
 336                  , init => sub { chdir $tmp or die $!; })
 337          }
 338         sub grg_remote_init_sftp ($) {
 339                 my ($ctx) = @_;
 340                 my $path = $ctx->{remote}->{uri}->path;
 341                 my $uri  = $ctx->{remote}->{uri}->clone;
 342                 $uri->fragment(undef);
 343                 $uri->path(undef);
 344                 $uri->query(undef);
 345                 IPC::Run::run([@{$ctx->{config}->{curl}}
 346                  , '--show-error', '--ftp-create-dirs'
 347                  , '-Q', "+mkdir ".$path
 348                  , $uri->as_string])
 349          }
 350         sub grg_remote_init ($) {
 351                 my ($ctx) = @_;
 352                 my $scheme = $ctx->{remote}->{uri}->scheme;
 353                 my $fct =
 354                  { file  => \&grg_remote_init_file
 355                  , rsync => \&grg_remote_init_rsync
 356                  , sftp  => \&grg_remote_init_sftp
 357                  }->{$scheme};
 358                 error("URL scheme not supported: `$scheme'")
 359                         unless $fct;
 360                 $fct->($ctx)
 361                         or error("remote init failed");
 362                 return;
 363          }
 364         sub grg_remote_push_file ($) {
 365                 my ($ctx) = @_;
 366                 my $ok = 1;
 367                 foreach my $file (@{$ctx->{remote}->{push}}) {
 368                         my $src = File::Spec->catfile($ctx->{'dir-cache'}, $file);
 369                         my $dst = File::Spec->catfile($ctx->{remote}->{uri}->file, $file);
 370                         debug(sub{"File::Copy::move('$src', '$dst')\n"});
 371                         if (not File::Copy::move($src, $dst)) {
 372                                 $ok = 0;
 373                                 last;
 374                          }
 375                  }
 376                 return $ok;
 377          }
 378         sub grg_remote_push_rsync ($) {
 379                 my ($ctx) = @_;
 380                 my $uri = $ctx->{remote}->{uri}->clone;
 381                 $uri->fragment(undef);
 382                 $uri->query(undef);
 383                 my ($path, $dst);
 384                 if ($uri->opaque =~ m{^//}) {
 385                         $uri->fragment(undef);
 386                         $uri->query(undef);
 387                         $dst = $uri->as_string;
 388                  }
 389                 else {
 390                         my ($authority, $path, $fragment)
 391                          = $uri->as_string =~ m|^rsync:(?:([^/#:]+):)?([^?#]*)(?:#(.*))?$|;
 392                         $dst = "$authority:$path/";
 393                  }
 394                 IPC::Run::run([@{$ctx->{config}->{rsync}}
 395                  , '-i', '--relative'
 396                  , (@{$ctx->{remote}->{push}})
 397                  , $dst]
 398                  , '>&2'
 399                  , init => sub { chdir $ctx->{'dir-cache'} or die $!; });
 400          }
 401         sub grg_remote_push_sftp ($) {
 402                 my ($ctx) = @_;
 403                 my $uri  = $ctx->{remote}->{uri}->clone;
 404                 $uri->fragment('');
 405                 $uri->query('');
 406                 IPC::Run::run([@{$ctx->{config}->{curl}}
 407                  , '--show-error', '--ftp-create-dirs', '--upload-file'
 408                  , '{'.join(',', @{$ctx->{remote}->{push}}).'}'
 409                  , $uri->as_string.'/'])
 410          }
 411         sub grg_remote_push ($) {
 412                 my ($ctx) = @_;
 413                 my $scheme = $ctx->{remote}->{uri}->scheme;
 414                 grg_remote_init($ctx)
 415                         unless $ctx->{remote}->{checked};
 416                 return 1
 417                         if @{$ctx->{remote}->{push}} == 0;
 418                 my $fct =
 419                  { file  => \&grg_remote_push_file
 420                  , rsync => \&grg_remote_push_rsync
 421                  , sftp  => \&grg_remote_push_sftp
 422                  }->{$scheme};
 423                 error("URL scheme not supported: `$scheme'")
 424                         unless $fct;
 425                 $fct->($ctx)
 426                         or error("remote push failed");
 427                 rm(map {File::Spec->catfile($ctx->{'dir-cache'}, $_)} @{$ctx->{remote}->{push}});
 428                 return 1;
 429          }
 430         sub grg_remote_remove ($) {
 431                 my ($ctx) = @_;
 432                 #my $scheme = $ctx->{remote}->{uri}->scheme;
 433                 #my $fct =
 434                 # { file => sub {
 435                 #               File::Copy::remove_tree
 436                 #                ( map { File::Spec->catfile($ctx->{remote}->{uri}->path, $_) } @$files
 437                 #                , verbose => 1 )
 438                 #        }
 439                 # , rsync => sub {
 440                 #               IPC::Run::run([@{$ctx->{config}->{rsync}}
 441                 #                , '--verbose', '--ignore-times', '--recursive', '--delete'
 442                 #                , @$files
 443                 #                , $ctx->{remote}->{uri}])
 444                 #        }
 445                 # , sftp => sub {
 446                 #               IPC::Run::run([@{$ctx->{config}->{curl}}
 447                 #                , '--show-error'
 448                 #                , map { ('-Q', 'rm '.$_) } @$files
 449                 #                , $ctx->{remote}->{uri}])
 450                 #        }
 451                 # }->{$scheme};
 452                 #error("URL scheme not supported: `$scheme'")
 453                 #       unless $fct;
 454                 #$fct->($ctx, $ctx->{remote}->{remove})
 455                 #       or error("remote remove failed");
 456                 #return;
 457          }
 458 # grg packing
 459         sub grg_pack_fetch ($$) {
 460                 my ($ctx, $fetch_objects) = @_;
 461                 local $_;
 462                 # %remote_objects
 463                         my %remote_objects = ();
 464                         while (my ($pack_id, $pack) = each %{$ctx->{manifest}->{packs}}) {
 465                                 foreach my $obj (@{$pack->{objects}}) {
 466                                         $remote_objects{$obj} = $pack_id;
 467                                  }
 468                          }
 469                 # @packs_to_fetch
 470                         my %packs_to_fetch = ();
 471                         foreach my $obj (@$fetch_objects) {
 472                                 my @packs = ($remote_objects{$obj});
 473                                 while (my $pack_id = shift @packs) {
 474                                         if (not exists $packs_to_fetch{$pack_id}) {
 475                                                 $packs_to_fetch{$pack_id} = 1;
 476                                                 my $manifest_pack = $ctx->{manifest}->{packs}->{$pack_id};
 477                                                 error("manifest is missing a dependency pack: $pack_id")
 478                                                         unless defined $manifest_pack;
 479                                                 @packs = (@packs, @{$manifest_pack->{deps}});
 480                                          }
 481                                  }
 482                          }
 483                         my @packs_to_fetch = keys %packs_to_fetch;
 484                 my $packs_fetched = grg_remote_fetch($ctx, [@packs_to_fetch]);
 485                 foreach my $pack_id (@packs_to_fetch) {
 486                         my $pack_fetched
 487                          = exists $packs_fetched->{$pack_id}
 488                          ? $packs_fetched->{$pack_id}
 489                          : {path => File::Spec->catfile($ctx->{'dir-cache'}, $pack_id), preserve => 0};
 490                         my $manifest_pack = $ctx->{manifest}->{packs}->{$pack_id};
 491                         my $pack_key = $manifest_pack->{key};
 492                         my $pack_data;
 493                         grg_decrypt_symmetric($ctx, $pack_key, sub {
 494                                 push @{$_[0]}, ($pack_fetched->{path});
 495                                 return (@_, '>', \$pack_data);
 496                          });
 497                         my $pack_hash_algo = $manifest_pack->{hash_algo};
 498                         my $pack_hash = grg_hash($ctx
 499                          , $pack_hash_algo
 500                          , sub { return (@_, '<', \$pack_data); });
 501                         error("pack data hash differs from pack manifest hash")
 502                                 unless $pack_hash eq $manifest_pack->{hash};
 503                         rm($pack_fetched)
 504                                 unless $pack_fetched->{preserve};
 505                         IPC::Run::run(['git', 'index-pack', '-v', '--stdin']
 506                          , '<', \$pack_data
 507                          , '>&2');
 508                  }
 509          }
 510         sub grg_pack_push ($$) {
 511                 my ($ctx, $push_objects) = @_;
 512                 local $_;
 513                 debug(sub{"push_objects=\n"}, $push_objects);
 514                 # %remote_objects
 515                         my %remote_objects = ();
 516                         while (my ($pack_id, $pack) = each %{$ctx->{manifest}->{packs}}) {
 517                                 foreach my $obj (@{$pack->{objects}}) {
 518                                         $remote_objects{$obj} = $pack_id;
 519                                  }
 520                          }
 521                 # @common_objects
 522                         IPC::Run::run(['git', 'cat-file', '--batch-check']
 523                          , '<', \join("\n", keys %remote_objects)
 524                          , '>', \$_)
 525                                 or error("failed to query local git objects");
 526                         my @common_objects
 527                          = map {
 528                                 if ($_ =~ m/ missing$/) { () }
 529                                 else { s/ .*//; $_ }
 530                          } (split(/\n/, $_));
 531                 # @pack_objects, @pack_deps_objects
 532                         IPC::Run::run(['git', 'rev-list', '--objects-edge', '--stdin', '--']
 533                          , '<', \join("\n", ((map {'^'.$_} @common_objects), @$push_objects))
 534                          , '>', \$_)
 535                                 or error("failed to query objects to pack");
 536                         my @pack_objects_edge = split(/\n/, $_);
 537                         foreach (@pack_objects_edge) {s/ .*//}
 538                         my @pack_objects = grep {m/^[^-]/} @pack_objects_edge;
 539                         my @pack_deps_objects = grep {s/^-//} @pack_objects_edge;
 540                 # %pack_deps
 541                         my %pack_deps = ();
 542                         foreach my $obj (@pack_deps_objects) {
 543                                 my $pack = $remote_objects{$obj};
 544                                 error("manifest is missing object dependencies")
 545                                         unless defined $pack;
 546                                 $pack_deps{$pack} = 1;
 547                          }
 548                 if (@pack_objects > 0) {
 549                         # $pack_id
 550                                 my $pack_id;
 551                                 my $pack_id_try = 0;
 552                                 while (not defined $pack_id
 553                                  or exists $ctx->{manifest}->{packs}->{$pack_id}) {
 554                                         $pack_id = grg_rand($ctx, $ctx->{config}->{'pack-filename-size'});
 555                                         $pack_id =~ s{/}{-}g;
 556                                         error("failed to pick an unused random pack filename after 512 tries; retry or increase grg.pack-filename-size")
 557                                                 if $pack_id_try++ >= 512;
 558                                  }
 559                         my $pack_key = grg_rand($ctx, $ctx->{config}->{'pack-key-size'});
 560                         my $pack_data;
 561                         IPC::Run::run(['git', 'pack-objects', '--stdout']
 562                          , '<', \join("\n", @pack_objects)
 563                          , '>', \$pack_data)
 564                                 or error("failed to pack objects to push");
 565                         my $pack_hash = grg_hash($ctx
 566                          , $ctx->{config}->{'pack-hash-algo'}
 567                          , sub { return (@_, '<', \$pack_data); });
 568                         grg_encrypt_symmetric($ctx, $pack_data, $pack_key, sub {
 569                                 push @{$_[0]}, ('--output', File::Spec->catfile($ctx->{'dir-cache'}, $pack_id));
 570                                 return @_;
 571                          });
 572                         push @{$ctx->{remote}->{push}}, $pack_id;
 573                         $ctx->{manifest}->{packs}->{$pack_id} =
 574                          { deps => [keys %pack_deps]
 575                          , hash => $pack_hash
 576                          , hash_algo => $ctx->{config}->{'pack-hash-algo'}
 577                          , key => $pack_key
 578                          , objects => \@pack_objects
 579                          };
 580                  }
 581          }
 582 # grg manifest
 583         sub grg_manifest_fetch ($) {
 584                 my ($ctx) = @_;
 585                 $ctx->{manifest} =
 586                  { 'hidden-keys' => {}
 587                  , keys => {}
 588                  , packs => {}
 589                  , refs => {}
 590                  , version => undef
 591                  };
 592                 my $fetched = grg_remote_fetch($ctx, [$ctx->{'manifest-file'}]);
 593                 my $crypt = $fetched->{$ctx->{'manifest-file'}}->{path};
 594                 if (defined $crypt) {
 595                         $ctx->{remote}->{checked} = 1;
 596                         my $json;
 597                         grg_decrypt_asymmetric($ctx, sub {
 598                                 push @{$_[0]}, $crypt;
 599                                 return (@_, '>', \$json); });
 600                         rm($fetched->{$ctx->{'manifest-file'}}->{path})
 601                                 unless $fetched->{$ctx->{'manifest-file'}}->{preserve};
 602                         my $manifest;
 603                         ($manifest = JSON::decode_json($json) and ref $manifest eq 'HASH')
 604                                 or error("failed to decode JSON manifest");
 605                         $ctx->{manifest} = {%{$ctx->{manifest}}, %$manifest};
 606                         foreach my $slot (qw(keys hidden-keys)) {
 607                                 while (my ($fpr, $uid) = each %{$ctx->{manifest}->{$slot}}) {
 608                                         my %keys = gpg_fingerprint($ctx, '0x'.$fpr, ['E']);
 609                                         my ($fpr, $uid) = each %keys;
 610                                         $ctx->{config}->{$slot}->{$fpr} = $uid;
 611                                  }
 612                          }
 613                  }
 614                 else {
 615                         debug(sub{'ctx='}, $ctx);
 616                         if ($ctx->{command} eq 'push' or $ctx->{command} eq 'list for-push') {
 617                                 $ctx->{remote}->{checked} = 0;
 618                          }
 619                         elsif ($ctx->{remote}->{checking}) {
 620                                 exit 100;
 621                          }
 622                         else {
 623                                 error("remote checking failed");
 624                          }
 625                  }
 626          }
 627         sub grg_manifest_push ($) {
 628                 my ($ctx) = @_;
 629                 foreach my $slot (qw(keys hidden-keys)) {
 630                         $ctx->{manifest}->{$slot} = {};
 631                         while (my ($fpr, $uid) = each %{$ctx->{config}->{$slot}}) {
 632                                 $ctx->{manifest}->{$slot}->{$fpr} = $uid;
 633                          }
 634                  }
 635                 my $json = JSON::encode_json($ctx->{manifest})
 636                         or error("failed to encode JSON manifest");
 637                 grg_encrypt_asymmetric($ctx, $json, sub {
 638                         push @{$_[0]}
 639                          , ('--output', File::Spec->catfile($ctx->{'dir-cache'}, $ctx->{'manifest-file'}));
 640                         return @_; });
 641                 push @{$ctx->{remote}->{push}}, $ctx->{'manifest-file'};
 642          }
 643 # grg config
 644         sub grg_config_read($) {
 645                 my ($ctx) = @_;
 646                 my $cfg = $ctx->{config};
 647                 local $/ = "\n";
 648
 649                 foreach my $name (qw(gpg signingkey keys)
 650                  , grep {       !m/^(gpg|signingkey|keys)$/ } (keys %$cfg)) {
 651                         my $value;
 652                         IPC::Run::run(['git', 'config', '--get', 'remote.'.$ctx->{remote}->{name}.'.'.$name, '.+'], '>', \$value) or
 653                         IPC::Run::run(['git', 'config', '--get', 'grg.'.$name, '.+'], '>', \$value) or 1;
 654                         if ($name eq 'signingkey') {
 655                                 IPC::Run::run(['git', 'config', '--get', 'user.'.$name, '.+'], '>', \$value)
 656                                         if (not $value);
 657                                 chomp $value;
 658                                 my %keys = gpg_fingerprint($ctx, $value, ['S']);
 659                                 warning("signing key ID is not matching a unique key: taking only one")
 660                                         unless scalar(keys %keys) == 1;
 661                                 my ($fpr, $uid) = each %keys;
 662                                 $cfg->{$name} = {fpr => $fpr, uid => $uid};
 663                          }
 664                         elsif ($name eq 'keys' or $name eq 'hidden-keys') {
 665                                 IPC::Run::run(['git', 'config', '--get', 'user.'.$name, '.+'], '>', \$value)
 666                                         if (not $value);
 667                                 chomp $value;
 668                                 my @ids = split(/,/, $value);
 669                                 if (@ids > 0) {
 670                                         foreach my $key (@ids) {
 671                                                 my %keys = gpg_fingerprint($ctx, $key, ['E']);
 672                                                 while (my ($fpr, $uid) = each %keys) {
 673                                                         $cfg->{$name}->{$fpr} = $uid;
 674                                                  }
 675                                          }
 676                                  }
 677                          }
 678                         elsif (grep(/^$name$/, qw(curl gpg rsync))) {
 679                                 IPC::Run::run(['git', 'config', '--get', $name.'.program', '.+'], '>', \$value)
 680                                         if (not $value);
 681                                 $cfg->{$name} = [split(' ', $value)]
 682                                         if $value;
 683                          }
 684                         else {
 685                                 chomp $value;
 686                                 $cfg->{$name} = $value
 687                                         if $value;
 688                          }
 689                  }
 690                 error("no signingkey configured; to do so you may use one of following commands:\n"
 691                  , "\t\$ git config remote.'$ctx->{remote}->{name}'.signingkey \$your_openpgp_id\n"
 692                  , "\t\$ git config grg.signingkey \$your_openpgp_id\n"
 693                  , "\t\$ git config user.signingkey \$your_openpgp_id"
 694                  ) unless defined $cfg->{signingkey};
 695                 if ( (scalar (keys %{$cfg->{keys}}) == 0)
 696                  and (scalar (keys %{$cfg->{'hidden-keys'}}) == 0) ) {
 697                         $cfg->{keys} = { $cfg->{signingkey}->{fpr} => $cfg->{signingkey}->{uid} };
 698                  }
 699
 700                 debug(sub{'config='},$cfg);
 701          }
 702 # grg system
 703         sub grg_connect ($) {
 704                 my ($ctx) = @_;
 705                 grg_config_read($ctx);
 706                 grg_manifest_fetch($ctx);
 707          }
 708         sub grg_disconnect ($) {
 709                 my ($ctx) = @_;
 710                 grg_remote_push($ctx);
 711          }
 712 # grg commands
 713         sub gpg_command_answer ($) {
 714                 my @cmd = @_;
 715                 debug(sub{join('', @cmd)."\n"});
 716                 print STDOUT (@cmd, "\n");
 717          }
 718         sub grg_command_capabilities ($) {
 719                 my ($ctx) = @_;
 720                 $ctx->{command} = 'capabilities';
 721                 gpg_command_answer("fetch");
 722                 gpg_command_answer("push");
 723                 gpg_command_answer("");
 724                 STDOUT->flush;
 725          }
 726         sub grg_command_fetch ($$) {
 727                 my ($ctx, $fetch_refs) = @_;
 728                 $ctx->{command} = 'fetch';
 729                 debug(sub{"fetch_refs="}, $fetch_refs);
 730                 grg_connect($ctx);
 731                 # @fetch_objects
 732                         my @fetch_objects= ();
 733                         foreach my $ref (@$fetch_refs) {
 734                                 push @fetch_objects, $ref->{sha1};
 735                          }
 736                 grg_pack_fetch($ctx, \@fetch_objects);
 737          }
 738         sub grg_command_list ($$) {
 739                 my ($ctx, $command) = @_;
 740                 $ctx->{command} = $command;
 741                 grg_connect($ctx);
 742                 while (my ($ref, $obj) = each %{$ctx->{manifest}->{refs}}) {
 743                         gpg_command_answer("$obj $ref");
 744                  };
 745                 gpg_command_answer("");
 746          }
 747         sub grg_command_push ($$) {
 748                 my ($ctx, $push_refs) = @_;
 749                 local $_;
 750                 $ctx->{command} = 'push';
 751                 debug(sub{"push_refs="}, $push_refs);
 752                 grg_connect($ctx);
 753                 # @push_objects
 754                         my @push_objects= ();
 755                         foreach my $ref (@$push_refs) {
 756                                 IPC::Run::run(['git', 'rev-list', '--ignore-missing', '--max-count=1', $ref->{src}, '--']
 757                                  , '>', \$_)
 758                                         or error("failed to dereference ref to push: ".$ref->{src});
 759                                 chomp;
 760                                 $ref->{src_obj} = $_;
 761                                 push @push_objects, $_;
 762                          }
 763                 grg_pack_push($ctx, \@push_objects);
 764                 my $manifest_refs = $ctx->{manifest}->{refs};
 765                 foreach my $ref (@$push_refs) {
 766                         $manifest_refs->{$ref->{dst}} = $ref->{src_obj};
 767                  }
 768                 $manifest_refs->{HEAD}
 769                  = $push_refs->[-1]->{src_obj}
 770                         unless exists $manifest_refs->{HEAD}
 771                         or @$push_refs == 0;
 772                 grg_manifest_push($ctx);
 773                 grg_disconnect($ctx);
 774          }
 775         sub grg_commands(@) {
 776                 my ($ctx) = @_;
 777                 my $line = undef;
 778                 local $/ = "\n";
 779                 #STDOUT->autoflush(1);
 780                 while (defined $line or (not eof(*STDIN) and
 781                         (defined($line = readline(*STDIN)))
 782                          ? (chomp $line or 1)
 783                          : error("readline failed: $!")
 784                  )) {
 785                         debug(sub{"line=\"",$line,"\"\n"});
 786                         $ctx->{command} = undef;
 787                         if ($line eq 'capabilities') {
 788                                 grg_command_capabilities($ctx);
 789                                 $line = undef;
 790                          }
 791                         elsif ($line =~ m/^fetch .*$/) {
 792                                 my @refs = ();
 793                                 my ($sha1, $name);
 794                                 while ((defined $line or (not eof(*STDIN) and
 795                                         ((defined($line = readline(*STDIN)))
 796                                          ? (chomp $line or 1)
 797                                          : error("readline failed: $!")))) and
 798                                         (($sha1, $name) = ($line =~ m/^fetch ([0-9a-f]{40}) (.+)$/))
 799                                  ) {
 800                                         debug(sub{"fetch line=\"",$line,"\"\n"});
 801                                         push @refs, {sha1=>$sha1, name=>$name};
 802                                         $line = undef;
 803                                  }
 804                                 error("failed to parse command: $line")
 805                                         if @refs == 0;
 806                                 grg_command_fetch($ctx, \@refs);
 807                          }
 808                         elsif ($line eq 'list' or $line eq 'list for-push') {
 809                                 grg_command_list($ctx, $line);
 810                                 $line = undef;
 811                          }
 812                         elsif ($line =~ m/^push .*$/) {
 813                                 my @refs = ();
 814                                 my ($force, $src, $dst);
 815                                 while ((defined $line or (not eof(*STDIN) and
 816                                         ((defined($line = readline(*STDIN)))
 817                                          ? (chomp $line or 1)
 818                                          : error("readline failed: $!")))) and
 819                                         (($force, $src, $dst) = ($line =~ m/^push (\+)?([^:]+):(.+)$/))
 820                                  ) {
 821                                         debug(sub{"push line=\"",$line,"\"\n"});
 822                                         push @refs, {force=>(defined $force), src=>$src, dst=>$dst};
 823                                         $line = undef;
 824                                  }
 825                                 error("failed to parse command: $line")
 826                                         if @refs == 0;
 827                                 grg_command_push($ctx, \@refs);
 828                          }
 829                         elsif ($line =~ m/^$/) {
 830                                 $line = undef;
 831                                 {
 832                                         local $SIG{'PIPE'} = 'IGNORE';
 833                                         gpg_command_answer("");
 834                                 }
 835                                 return 0;
 836                          }
 837                         else {
 838                                 warning("unsupported command supplied: `$line'");
 839                                 $line = undef;
 840                          }
 841                  }
 842          }
 843 sub main {
 844         $ENV{GIT_DIR} = $ENV{GIT_DIR} || '.git';
 845         $ENV{GITCEPTION} = ($ENV{GITCEPTION} || '') . '+';
 846         my $ctx =
 847          { command => undef
 848          , config =>
 849                  { curl => ['curl']
 850                  , gpg => ['gpg']
 851                  , keys => {}
 852                  , 'hidden-keys' => {}
 853                  , 'manifest-hash-algo' => 'SHA224' # NOTE: SHA512, SHA384, SHA256, SHA224 supported.
 854                  , 'pack-filename-size' => 42
 855                  , 'pack-hash-algo' => 'SHA224' # NOTE: SHA512, SHA384, SHA256, SHA224 supported.
 856                  , 'pack-key-size' => 64
 857                  , signingkey => undef
 858                  , rsync => ['rsync']
 859                  }
 860          , 'dir-cache' => undef
 861          , manifest => {}
 862          , 'manifest-file' => undef
 863          , remote =>
 864                  { checking => 0
 865                  , checked => undef
 866                  , name => undef
 867                  , uri => undef
 868                  , push => []
 869                  }
 870          };
 871         Getopt::Long::Configure
 872          ( 'auto_version'
 873          , 'pass_through'
 874          , 'require_order'
 875          );
 876         Getopt::Long::GetOptions
 877          ( help => sub { Pod::Usage::pod2usage
 878                  ( -exitstatus => 0
 879                  , -sections   => ['SYNOPSIS', 'OPTIONS', 'REMOTES', 'CONFIG']
 880                  , -verbose    => 99 ); }
 881          , man => sub { Pod::Usage::pod2usage(-verbose => 2); }
 882          , check => sub {
 883                         $ctx->{remote}->{checking} = 1;
 884                  }
 885          );
 886         if (not $ctx->{remote}->{checking}) {
 887                 my $name = shift @ARGV;
 888                 Pod::Usage::pod2usage(-verbose => 1)
 889                         unless defined $name;
 890                 ($ctx->{remote}->{name}) = ($name =~ m/^((\w|-)+)$/);
 891                 error("valid name of remote Git required, got: `$name'")
 892                         unless $ctx->{remote}->{name};
 893          }
 894         my $uri = shift @ARGV;
 895         Pod::Usage::pod2usage(-verbose => 1)
 896                 unless defined $uri;
 897         $ctx->{remote}->{uri} = URI->new($uri);
 898         error("valid URL of remote Git required, got: `$uri'")
 899                 unless $ctx->{remote}->{uri};
 900         my $fragment = $ctx->{remote}->{uri}->fragment;
 901         $fragment = ''
 902                 unless defined $fragment;
 903         $ctx->{'manifest-file'} = grg_hash($ctx
 904          , $ctx->{config}->{'manifest-hash-algo'}
 905          , sub { return (@_, '<', \$fragment); });
 906         if (-d $ENV{GIT_DIR}) {
 907                 $ctx->{'dir-cache'} = File::Spec->catdir
 908                  ( $ENV{GIT_DIR}, 'cache', 'remotes'
 909                  , $ctx->{remote}->{name}, 'gpg');
 910                 &mkdir($ctx->{'dir-cache'});
 911          }
 912         else {
 913                 $ctx->{'dir-cache'} = File::Temp->tempdir('grg_cache_XXXXXXXX', CLEANUP => 1);
 914          }
 915         debug(sub{"ctx="},$ctx);
 916         grg_commands($ctx);
 917  }
 918 main;
 919 1;
 920 __END__
 921
 922 =encoding utf8
 923
 924 =head1 NAME
 925
 926 git-remote-gpg - git-remote-helpers(1) to encrypt remote repository through gpg(1)
 927
 928 =head1 SYNOPSIS
 929
 930 =item git-remote-gpg $gpg_remote $gpg_url
 931
 932 =item git-remote-gpg --check $gpg_url
 933
 934 =head1 OPTIONS
 935
 936 =over 8
 937
 938 =item B<-h>, B<--help>
 939
 940 =item B<--version>
 941
 942 =back
 943
 944 =head1 REMOTES
 945
 946 =head2 Via rsync(1)
 947
 948 =item git remote add $remote gpg::rsync:${user:+$user@}$host:$path
 949
 950 =item git remote add $remote gpg::rsync://${user:+$user@}$host${port:+:$port}/$path
 951
 952 =head2 Via curl(1)
 953
 954 =item git remote add $remote gpg::sftp://${user:+$user@}$host${port:+:$port}/$path
 955
 956 =head2 Via File::Copy(3pm)
 957
 958 =item git remote add $remote gpg::file://$path
 959
 960 =head1 CONFIG
 961
 962 =head2 git-config(1)
 963
 964 =over 8
 965
 966 =item B<grg.curl>
 967
 968 =item B<grg.gpg>
 969
 970 =item B<grg.keys>
 971
 972 =item B<grg.hidden-keys>
 973
 974 =item B<grg.manifest-hash-algo>
 975
 976 =item B<grg.pack-filename-size>
 977
 978 =item B<grg.pack-hash-algo>
 979
 980 =item B<grg.pack-key-size>
 981
 982 =item B<grg.signingkey>
 983
 984 =item B<grg.rsync>
 985
 986 =back
 987
 988 =cut