Fix git-remote for ActiveState Perl
[git/git.git] / perl / Git.pm
1 =head1 NAME
2
3 Git - Perl interface to the Git version control system
4
5 =cut
6
7
8 package Git;
9
10 use strict;
11
12
13 BEGIN {
14
15 our ($VERSION, @ISA, @EXPORT, @EXPORT_OK);
16
17 # Totally unstable API.
18 $VERSION = '0.01';
19
20
21 =head1 SYNOPSIS
22
23 use Git;
24
25 my $version = Git::command_oneline('version');
26
27 git_cmd_try { Git::command_noisy('update-server-info') }
28 '%s failed w/ code %d';
29
30 my $repo = Git->repository (Directory => '/srv/git/cogito.git');
31
32
33 my @revs = $repo->command('rev-list', '--since=last monday', '--all');
34
35 my ($fh, $c) = $repo->command_output_pipe('rev-list', '--since=last monday', '--all');
36 my $lastrev = <$fh>; chomp $lastrev;
37 $repo->command_close_pipe($fh, $c);
38
39 my $lastrev = $repo->command_oneline( [ 'rev-list', '--all' ],
40 STDERR => 0 );
41
42 =cut
43
44
45 require Exporter;
46
47 @ISA = qw(Exporter);
48
49 @EXPORT = qw(git_cmd_try);
50
51 # Methods which can be called as standalone functions as well:
52 @EXPORT_OK = qw(command command_oneline command_noisy
53 command_output_pipe command_input_pipe command_close_pipe
54 version exec_path hash_object git_cmd_try);
55
56
57 =head1 DESCRIPTION
58
59 This module provides Perl scripts easy way to interface the Git version control
60 system. The modules have an easy and well-tested way to call arbitrary Git
61 commands; in the future, the interface will also provide specialized methods
62 for doing easily operations which are not totally trivial to do over
63 the generic command interface.
64
65 While some commands can be executed outside of any context (e.g. 'version'
66 or 'init'), most operations require a repository context, which in practice
67 means getting an instance of the Git object using the repository() constructor.
68 (In the future, we will also get a new_repository() constructor.) All commands
69 called as methods of the object are then executed in the context of the
70 repository.
71
72 Part of the "repository state" is also information about path to the attached
73 working copy (unless you work with a bare repository). You can also navigate
74 inside of the working copy using the C<wc_chdir()> method. (Note that
75 the repository object is self-contained and will not change working directory
76 of your process.)
77
78 TODO: In the future, we might also do
79
80 my $remoterepo = $repo->remote_repository (Name => 'cogito', Branch => 'master');
81 $remoterepo ||= Git->remote_repository ('http://git.or.cz/cogito.git/');
82 my @refs = $remoterepo->refs();
83
84 Currently, the module merely wraps calls to external Git tools. In the future,
85 it will provide a much faster way to interact with Git by linking directly
86 to libgit. This should be completely opaque to the user, though (performance
87 increate nonwithstanding).
88
89 =cut
90
91
92 use Carp qw(carp croak); # but croak is bad - throw instead
93 use Error qw(:try);
94 use Cwd qw(abs_path);
95
96 }
97
98
99 =head1 CONSTRUCTORS
100
101 =over 4
102
103 =item repository ( OPTIONS )
104
105 =item repository ( DIRECTORY )
106
107 =item repository ()
108
109 Construct a new repository object.
110 C<OPTIONS> are passed in a hash like fashion, using key and value pairs.
111 Possible options are:
112
113 B<Repository> - Path to the Git repository.
114
115 B<WorkingCopy> - Path to the associated working copy; not strictly required
116 as many commands will happily crunch on a bare repository.
117
118 B<WorkingSubdir> - Subdirectory in the working copy to work inside.
119 Just left undefined if you do not want to limit the scope of operations.
120
121 B<Directory> - Path to the Git working directory in its usual setup.
122 The C<.git> directory is searched in the directory and all the parent
123 directories; if found, C<WorkingCopy> is set to the directory containing
124 it and C<Repository> to the C<.git> directory itself. If no C<.git>
125 directory was found, the C<Directory> is assumed to be a bare repository,
126 C<Repository> is set to point at it and C<WorkingCopy> is left undefined.
127 If the C<$GIT_DIR> environment variable is set, things behave as expected
128 as well.
129
130 You should not use both C<Directory> and either of C<Repository> and
131 C<WorkingCopy> - the results of that are undefined.
132
133 Alternatively, a directory path may be passed as a single scalar argument
134 to the constructor; it is equivalent to setting only the C<Directory> option
135 field.
136
137 Calling the constructor with no options whatsoever is equivalent to
138 calling it with C<< Directory => '.' >>. In general, if you are building
139 a standard porcelain command, simply doing C<< Git->repository() >> should
140 do the right thing and setup the object to reflect exactly where the user
141 is right now.
142
143 =cut
144
145 sub repository {
146 my $class = shift;
147 my @args = @_;
148 my %opts = ();
149 my $self;
150
151 if (defined $args[0]) {
152 if ($#args % 2 != 1) {
153 # Not a hash.
154 $#args == 0 or throw Error::Simple("bad usage");
155 %opts = ( Directory => $args[0] );
156 } else {
157 %opts = @args;
158 }
159 }
160
161 if (not defined $opts{Repository} and not defined $opts{WorkingCopy}) {
162 $opts{Directory} ||= '.';
163 }
164
165 if ($opts{Directory}) {
166 -d $opts{Directory} or throw Error::Simple("Directory not found: $!");
167
168 my $search = Git->repository(WorkingCopy => $opts{Directory});
169 my $dir;
170 try {
171 $dir = $search->command_oneline(['rev-parse', '--git-dir'],
172 STDERR => 0);
173 } catch Git::Error::Command with {
174 $dir = undef;
175 };
176
177 if ($dir) {
178 $dir =~ m#^/# or $dir = $opts{Directory} . '/' . $dir;
179 $opts{Repository} = $dir;
180
181 # If --git-dir went ok, this shouldn't die either.
182 my $prefix = $search->command_oneline('rev-parse', '--show-prefix');
183 $dir = abs_path($opts{Directory}) . '/';
184 if ($prefix) {
185 if (substr($dir, -length($prefix)) ne $prefix) {
186 throw Error::Simple("rev-parse confused me - $dir does not have trailing $prefix");
187 }
188 substr($dir, -length($prefix)) = '';
189 }
190 $opts{WorkingCopy} = $dir;
191 $opts{WorkingSubdir} = $prefix;
192
193 } else {
194 # A bare repository? Let's see...
195 $dir = $opts{Directory};
196
197 unless (-d "$dir/refs" and -d "$dir/objects" and -e "$dir/HEAD") {
198 # Mimick git-rev-parse --git-dir error message:
199 throw Error::Simple('fatal: Not a git repository');
200 }
201 my $search = Git->repository(Repository => $dir);
202 try {
203 $search->command('symbolic-ref', 'HEAD');
204 } catch Git::Error::Command with {
205 # Mimick git-rev-parse --git-dir error message:
206 throw Error::Simple('fatal: Not a git repository');
207 }
208
209 $opts{Repository} = abs_path($dir);
210 }
211
212 delete $opts{Directory};
213 }
214
215 $self = { opts => \%opts };
216 bless $self, $class;
217 }
218
219
220 =back
221
222 =head1 METHODS
223
224 =over 4
225
226 =item command ( COMMAND [, ARGUMENTS... ] )
227
228 =item command ( [ COMMAND, ARGUMENTS... ], { Opt => Val ... } )
229
230 Execute the given Git C<COMMAND> (specify it without the 'git-'
231 prefix), optionally with the specified extra C<ARGUMENTS>.
232
233 The second more elaborate form can be used if you want to further adjust
234 the command execution. Currently, only one option is supported:
235
236 B<STDERR> - How to deal with the command's error output. By default (C<undef>)
237 it is delivered to the caller's C<STDERR>. A false value (0 or '') will cause
238 it to be thrown away. If you want to process it, you can get it in a filehandle
239 you specify, but you must be extremely careful; if the error output is not
240 very short and you want to read it in the same process as where you called
241 C<command()>, you are set up for a nice deadlock!
242
243 The method can be called without any instance or on a specified Git repository
244 (in that case the command will be run in the repository context).
245
246 In scalar context, it returns all the command output in a single string
247 (verbatim).
248
249 In array context, it returns an array containing lines printed to the
250 command's stdout (without trailing newlines).
251
252 In both cases, the command's stdin and stderr are the same as the caller's.
253
254 =cut
255
256 sub command {
257 my ($fh, $ctx) = command_output_pipe(@_);
258
259 if (not defined wantarray) {
260 # Nothing to pepper the possible exception with.
261 _cmd_close($fh, $ctx);
262
263 } elsif (not wantarray) {
264 local $/;
265 my $text = <$fh>;
266 try {
267 _cmd_close($fh, $ctx);
268 } catch Git::Error::Command with {
269 # Pepper with the output:
270 my $E = shift;
271 $E->{'-outputref'} = \$text;
272 throw $E;
273 };
274 return $text;
275
276 } else {
277 my @lines = <$fh>;
278 defined and chomp for @lines;
279 try {
280 _cmd_close($fh, $ctx);
281 } catch Git::Error::Command with {
282 my $E = shift;
283 $E->{'-outputref'} = \@lines;
284 throw $E;
285 };
286 return @lines;
287 }
288 }
289
290
291 =item command_oneline ( COMMAND [, ARGUMENTS... ] )
292
293 =item command_oneline ( [ COMMAND, ARGUMENTS... ], { Opt => Val ... } )
294
295 Execute the given C<COMMAND> in the same way as command()
296 does but always return a scalar string containing the first line
297 of the command's standard output.
298
299 =cut
300
301 sub command_oneline {
302 my ($fh, $ctx) = command_output_pipe(@_);
303
304 my $line = <$fh>;
305 defined $line and chomp $line;
306 try {
307 _cmd_close($fh, $ctx);
308 } catch Git::Error::Command with {
309 # Pepper with the output:
310 my $E = shift;
311 $E->{'-outputref'} = \$line;
312 throw $E;
313 };
314 return $line;
315 }
316
317
318 =item command_output_pipe ( COMMAND [, ARGUMENTS... ] )
319
320 =item command_output_pipe ( [ COMMAND, ARGUMENTS... ], { Opt => Val ... } )
321
322 Execute the given C<COMMAND> in the same way as command()
323 does but return a pipe filehandle from which the command output can be
324 read.
325
326 The function can return C<($pipe, $ctx)> in array context.
327 See C<command_close_pipe()> for details.
328
329 =cut
330
331 sub command_output_pipe {
332 _command_common_pipe('-|', @_);
333 }
334
335
336 =item command_input_pipe ( COMMAND [, ARGUMENTS... ] )
337
338 =item command_input_pipe ( [ COMMAND, ARGUMENTS... ], { Opt => Val ... } )
339
340 Execute the given C<COMMAND> in the same way as command_output_pipe()
341 does but return an input pipe filehandle instead; the command output
342 is not captured.
343
344 The function can return C<($pipe, $ctx)> in array context.
345 See C<command_close_pipe()> for details.
346
347 =cut
348
349 sub command_input_pipe {
350 _command_common_pipe('|-', @_);
351 }
352
353
354 =item command_close_pipe ( PIPE [, CTX ] )
355
356 Close the C<PIPE> as returned from C<command_*_pipe()>, checking
357 whether the command finished successfully. The optional C<CTX> argument
358 is required if you want to see the command name in the error message,
359 and it is the second value returned by C<command_*_pipe()> when
360 called in array context. The call idiom is:
361
362 my ($fh, $ctx) = $r->command_output_pipe('status');
363 while (<$fh>) { ... }
364 $r->command_close_pipe($fh, $ctx);
365
366 Note that you should not rely on whatever actually is in C<CTX>;
367 currently it is simply the command name but in future the context might
368 have more complicated structure.
369
370 =cut
371
372 sub command_close_pipe {
373 my ($self, $fh, $ctx) = _maybe_self(@_);
374 $ctx ||= '<unknown>';
375 _cmd_close($fh, $ctx);
376 }
377
378
379 =item command_noisy ( COMMAND [, ARGUMENTS... ] )
380
381 Execute the given C<COMMAND> in the same way as command() does but do not
382 capture the command output - the standard output is not redirected and goes
383 to the standard output of the caller application.
384
385 While the method is called command_noisy(), you might want to as well use
386 it for the most silent Git commands which you know will never pollute your
387 stdout but you want to avoid the overhead of the pipe setup when calling them.
388
389 The function returns only after the command has finished running.
390
391 =cut
392
393 sub command_noisy {
394 my ($self, $cmd, @args) = _maybe_self(@_);
395 _check_valid_cmd($cmd);
396
397 my $pid = fork;
398 if (not defined $pid) {
399 throw Error::Simple("fork failed: $!");
400 } elsif ($pid == 0) {
401 _cmd_exec($self, $cmd, @args);
402 }
403 if (waitpid($pid, 0) > 0 and $?>>8 != 0) {
404 throw Git::Error::Command(join(' ', $cmd, @args), $? >> 8);
405 }
406 }
407
408
409 =item version ()
410
411 Return the Git version in use.
412
413 =cut
414
415 sub version {
416 my $verstr = command_oneline('--version');
417 $verstr =~ s/^git version //;
418 $verstr;
419 }
420
421
422 =item exec_path ()
423
424 Return path to the Git sub-command executables (the same as
425 C<git --exec-path>). Useful mostly only internally.
426
427 =cut
428
429 sub exec_path { command_oneline('--exec-path') }
430
431
432 =item repo_path ()
433
434 Return path to the git repository. Must be called on a repository instance.
435
436 =cut
437
438 sub repo_path { $_[0]->{opts}->{Repository} }
439
440
441 =item wc_path ()
442
443 Return path to the working copy. Must be called on a repository instance.
444
445 =cut
446
447 sub wc_path { $_[0]->{opts}->{WorkingCopy} }
448
449
450 =item wc_subdir ()
451
452 Return path to the subdirectory inside of a working copy. Must be called
453 on a repository instance.
454
455 =cut
456
457 sub wc_subdir { $_[0]->{opts}->{WorkingSubdir} ||= '' }
458
459
460 =item wc_chdir ( SUBDIR )
461
462 Change the working copy subdirectory to work within. The C<SUBDIR> is
463 relative to the working copy root directory (not the current subdirectory).
464 Must be called on a repository instance attached to a working copy
465 and the directory must exist.
466
467 =cut
468
469 sub wc_chdir {
470 my ($self, $subdir) = @_;
471 $self->wc_path()
472 or throw Error::Simple("bare repository");
473
474 -d $self->wc_path().'/'.$subdir
475 or throw Error::Simple("subdir not found: $!");
476 # Of course we will not "hold" the subdirectory so anyone
477 # can delete it now and we will never know. But at least we tried.
478
479 $self->{opts}->{WorkingSubdir} = $subdir;
480 }
481
482
483 =item config ( VARIABLE )
484
485 Retrieve the configuration C<VARIABLE> in the same manner as C<config>
486 does. In scalar context requires the variable to be set only one time
487 (exception is thrown otherwise), in array context returns allows the
488 variable to be set multiple times and returns all the values.
489
490 Must be called on a repository instance.
491
492 This currently wraps command('config') so it is not so fast.
493
494 =cut
495
496 sub config {
497 my ($self, $var) = @_;
498 $self->repo_path()
499 or throw Error::Simple("not a repository");
500
501 try {
502 if (wantarray) {
503 return $self->command('config', '--get-all', $var);
504 } else {
505 return $self->command_oneline('config', '--get', $var);
506 }
507 } catch Git::Error::Command with {
508 my $E = shift;
509 if ($E->value() == 1) {
510 # Key not found.
511 return undef;
512 } else {
513 throw $E;
514 }
515 };
516 }
517
518
519 =item config_bool ( VARIABLE )
520
521 Retrieve the bool configuration C<VARIABLE>. The return value
522 is usable as a boolean in perl (and C<undef> if it's not defined,
523 of course).
524
525 Must be called on a repository instance.
526
527 This currently wraps command('config') so it is not so fast.
528
529 =cut
530
531 sub config_bool {
532 my ($self, $var) = @_;
533 $self->repo_path()
534 or throw Error::Simple("not a repository");
535
536 try {
537 my $val = $self->command_oneline('config', '--bool', '--get',
538 $var);
539 return undef unless defined $val;
540 return $val eq 'true';
541 } catch Git::Error::Command with {
542 my $E = shift;
543 if ($E->value() == 1) {
544 # Key not found.
545 return undef;
546 } else {
547 throw $E;
548 }
549 };
550 }
551
552
553 =item ident ( TYPE | IDENTSTR )
554
555 =item ident_person ( TYPE | IDENTSTR | IDENTARRAY )
556
557 This suite of functions retrieves and parses ident information, as stored
558 in the commit and tag objects or produced by C<var GIT_type_IDENT> (thus
559 C<TYPE> can be either I<author> or I<committer>; case is insignificant).
560
561 The C<ident> method retrieves the ident information from C<git-var>
562 and either returns it as a scalar string or as an array with the fields parsed.
563 Alternatively, it can take a prepared ident string (e.g. from the commit
564 object) and just parse it.
565
566 C<ident_person> returns the person part of the ident - name and email;
567 it can take the same arguments as C<ident> or the array returned by C<ident>.
568
569 The synopsis is like:
570
571 my ($name, $email, $time_tz) = ident('author');
572 "$name <$email>" eq ident_person('author');
573 "$name <$email>" eq ident_person($name);
574 $time_tz =~ /^\d+ [+-]\d{4}$/;
575
576 Both methods must be called on a repository instance.
577
578 =cut
579
580 sub ident {
581 my ($self, $type) = @_;
582 my $identstr;
583 if (lc $type eq lc 'committer' or lc $type eq lc 'author') {
584 $identstr = $self->command_oneline('var', 'GIT_'.uc($type).'_IDENT');
585 } else {
586 $identstr = $type;
587 }
588 if (wantarray) {
589 return $identstr =~ /^(.*) <(.*)> (\d+ [+-]\d{4})$/;
590 } else {
591 return $identstr;
592 }
593 }
594
595 sub ident_person {
596 my ($self, @ident) = @_;
597 $#ident == 0 and @ident = $self->ident($ident[0]);
598 return "$ident[0] <$ident[1]>";
599 }
600
601
602 =item hash_object ( TYPE, FILENAME )
603
604 Compute the SHA1 object id of the given C<FILENAME> (or data waiting in
605 C<FILEHANDLE>) considering it is of the C<TYPE> object type (C<blob>,
606 C<commit>, C<tree>).
607
608 The method can be called without any instance or on a specified Git repository,
609 it makes zero difference.
610
611 The function returns the SHA1 hash.
612
613 =cut
614
615 # TODO: Support for passing FILEHANDLE instead of FILENAME
616 sub hash_object {
617 my ($self, $type, $file) = _maybe_self(@_);
618 command_oneline('hash-object', '-t', $type, $file);
619 }
620
621
622
623 =back
624
625 =head1 ERROR HANDLING
626
627 All functions are supposed to throw Perl exceptions in case of errors.
628 See the L<Error> module on how to catch those. Most exceptions are mere
629 L<Error::Simple> instances.
630
631 However, the C<command()>, C<command_oneline()> and C<command_noisy()>
632 functions suite can throw C<Git::Error::Command> exceptions as well: those are
633 thrown when the external command returns an error code and contain the error
634 code as well as access to the captured command's output. The exception class
635 provides the usual C<stringify> and C<value> (command's exit code) methods and
636 in addition also a C<cmd_output> method that returns either an array or a
637 string with the captured command output (depending on the original function
638 call context; C<command_noisy()> returns C<undef>) and $<cmdline> which
639 returns the command and its arguments (but without proper quoting).
640
641 Note that the C<command_*_pipe()> functions cannot throw this exception since
642 it has no idea whether the command failed or not. You will only find out
643 at the time you C<close> the pipe; if you want to have that automated,
644 use C<command_close_pipe()>, which can throw the exception.
645
646 =cut
647
648 {
649 package Git::Error::Command;
650
651 @Git::Error::Command::ISA = qw(Error);
652
653 sub new {
654 my $self = shift;
655 my $cmdline = '' . shift;
656 my $value = 0 + shift;
657 my $outputref = shift;
658 my(@args) = ();
659
660 local $Error::Depth = $Error::Depth + 1;
661
662 push(@args, '-cmdline', $cmdline);
663 push(@args, '-value', $value);
664 push(@args, '-outputref', $outputref);
665
666 $self->SUPER::new(-text => 'command returned error', @args);
667 }
668
669 sub stringify {
670 my $self = shift;
671 my $text = $self->SUPER::stringify;
672 $self->cmdline() . ': ' . $text . ': ' . $self->value() . "\n";
673 }
674
675 sub cmdline {
676 my $self = shift;
677 $self->{'-cmdline'};
678 }
679
680 sub cmd_output {
681 my $self = shift;
682 my $ref = $self->{'-outputref'};
683 defined $ref or undef;
684 if (ref $ref eq 'ARRAY') {
685 return @$ref;
686 } else { # SCALAR
687 return $$ref;
688 }
689 }
690 }
691
692 =over 4
693
694 =item git_cmd_try { CODE } ERRMSG
695
696 This magical statement will automatically catch any C<Git::Error::Command>
697 exceptions thrown by C<CODE> and make your program die with C<ERRMSG>
698 on its lips; the message will have %s substituted for the command line
699 and %d for the exit status. This statement is useful mostly for producing
700 more user-friendly error messages.
701
702 In case of no exception caught the statement returns C<CODE>'s return value.
703
704 Note that this is the only auto-exported function.
705
706 =cut
707
708 sub git_cmd_try(&$) {
709 my ($code, $errmsg) = @_;
710 my @result;
711 my $err;
712 my $array = wantarray;
713 try {
714 if ($array) {
715 @result = &$code;
716 } else {
717 $result[0] = &$code;
718 }
719 } catch Git::Error::Command with {
720 my $E = shift;
721 $err = $errmsg;
722 $err =~ s/\%s/$E->cmdline()/ge;
723 $err =~ s/\%d/$E->value()/ge;
724 # We can't croak here since Error.pm would mangle
725 # that to Error::Simple.
726 };
727 $err and croak $err;
728 return $array ? @result : $result[0];
729 }
730
731
732 =back
733
734 =head1 COPYRIGHT
735
736 Copyright 2006 by Petr Baudis E<lt>pasky@suse.czE<gt>.
737
738 This module is free software; it may be used, copied, modified
739 and distributed under the terms of the GNU General Public Licence,
740 either version 2, or (at your option) any later version.
741
742 =cut
743
744
745 # Take raw method argument list and return ($obj, @args) in case
746 # the method was called upon an instance and (undef, @args) if
747 # it was called directly.
748 sub _maybe_self {
749 # This breaks inheritance. Oh well.
750 ref $_[0] eq 'Git' ? @_ : (undef, @_);
751 }
752
753 # Check if the command id is something reasonable.
754 sub _check_valid_cmd {
755 my ($cmd) = @_;
756 $cmd =~ /^[a-z0-9A-Z_-]+$/ or throw Error::Simple("bad command: $cmd");
757 }
758
759 # Common backend for the pipe creators.
760 sub _command_common_pipe {
761 my $direction = shift;
762 my ($self, @p) = _maybe_self(@_);
763 my (%opts, $cmd, @args);
764 if (ref $p[0]) {
765 ($cmd, @args) = @{shift @p};
766 %opts = ref $p[0] ? %{$p[0]} : @p;
767 } else {
768 ($cmd, @args) = @p;
769 }
770 _check_valid_cmd($cmd);
771
772 my $fh;
773 if ($^O eq 'MSWin32') {
774 # ActiveState Perl
775 #defined $opts{STDERR} and
776 # warn 'ignoring STDERR option - running w/ ActiveState';
777 $direction eq '-|' or
778 die 'input pipe for ActiveState not implemented';
779 # the strange construction with *ACPIPE is just to
780 # explain the tie below that we want to bind to
781 # a handle class, not scalar. It is not known if
782 # it is something specific to ActiveState Perl or
783 # just a Perl quirk.
784 tie (*ACPIPE, 'Git::activestate_pipe', $cmd, @args);
785 $fh = *ACPIPE;
786
787 } else {
788 my $pid = open($fh, $direction);
789 if (not defined $pid) {
790 throw Error::Simple("open failed: $!");
791 } elsif ($pid == 0) {
792 if (defined $opts{STDERR}) {
793 close STDERR;
794 }
795 if ($opts{STDERR}) {
796 open (STDERR, '>&', $opts{STDERR})
797 or die "dup failed: $!";
798 }
799 _cmd_exec($self, $cmd, @args);
800 }
801 }
802 return wantarray ? ($fh, join(' ', $cmd, @args)) : $fh;
803 }
804
805 # When already in the subprocess, set up the appropriate state
806 # for the given repository and execute the git command.
807 sub _cmd_exec {
808 my ($self, @args) = @_;
809 if ($self) {
810 $self->repo_path() and $ENV{'GIT_DIR'} = $self->repo_path();
811 $self->wc_path() and chdir($self->wc_path());
812 $self->wc_subdir() and chdir($self->wc_subdir());
813 }
814 _execv_git_cmd(@args);
815 die "exec failed: $!";
816 }
817
818 # Execute the given Git command ($_[0]) with arguments ($_[1..])
819 # by searching for it at proper places.
820 sub _execv_git_cmd { exec('git', @_); }
821
822 # Close pipe to a subprocess.
823 sub _cmd_close {
824 my ($fh, $ctx) = @_;
825 if (not close $fh) {
826 if ($!) {
827 # It's just close, no point in fatalities
828 carp "error closing pipe: $!";
829 } elsif ($? >> 8) {
830 # The caller should pepper this.
831 throw Git::Error::Command($ctx, $? >> 8);
832 }
833 # else we might e.g. closed a live stream; the command
834 # dying of SIGPIPE would drive us here.
835 }
836 }
837
838
839 sub DESTROY { }
840
841
842 # Pipe implementation for ActiveState Perl.
843
844 package Git::activestate_pipe;
845 use strict;
846
847 sub TIEHANDLE {
848 my ($class, @params) = @_;
849 # FIXME: This is probably horrible idea and the thing will explode
850 # at the moment you give it arguments that require some quoting,
851 # but I have no ActiveState clue... --pasky
852 # Let's just hope ActiveState Perl does at least the quoting
853 # correctly.
854 my @data = qx{git @params};
855 bless { i => 0, data => \@data }, $class;
856 }
857
858 sub READLINE {
859 my $self = shift;
860 if ($self->{i} >= scalar @{$self->{data}}) {
861 return undef;
862 }
863 my $i = $self->{i};
864 if (wantarray) {
865 $self->{i} = $#{$self->{'data'}} + 1;
866 return splice(@{$self->{'data'}}, $i);
867 }
868 $self->{i} = $i + 1;
869 return $self->{'data'}->[ $i ];
870 }
871
872 sub CLOSE {
873 my $self = shift;
874 delete $self->{data};
875 delete $self->{i};
876 }
877
878 sub EOF {
879 my $self = shift;
880 return ($self->{i} >= scalar @{$self->{data}});
881 }
882
883
884 1; # Famous last words