Error out when user doesn't have access permission to the repository
[git/git.git] / perl / Git.pm
CommitLineData
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1=head1 NAME
2
3Git - Perl interface to the Git version control system
4
5=cut
6
7
8package Git;
9
10use strict;
11
12
13BEGIN {
14
15our ($VERSION, @ISA, @EXPORT, @EXPORT_OK);
16
17# Totally unstable API.
18$VERSION = '0.01';
19
20
21=head1 SYNOPSIS
22
23 use Git;
24
25 my $version = Git::command_oneline('version');
26
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27 git_cmd_try { Git::command_noisy('update-server-info') }
28 '%s failed w/ code %d';
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29
30 my $repo = Git->repository (Directory => '/srv/git/cogito.git');
31
32
33 my @revs = $repo->command('rev-list', '--since=last monday', '--all');
34
d79850e1 35 my ($fh, $c) = $repo->command_output_pipe('rev-list', '--since=last monday', '--all');
b1edc53d 36 my $lastrev = <$fh>; chomp $lastrev;
8b9150e3 37 $repo->command_close_pipe($fh, $c);
b1edc53d 38
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39 my $lastrev = $repo->command_oneline( [ 'rev-list', '--all' ],
40 STDERR => 0 );
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41
42=cut
43
44
45require Exporter;
46
47@ISA = qw(Exporter);
48
8b9150e3 49@EXPORT = qw(git_cmd_try);
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50
51# Methods which can be called as standalone functions as well:
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52@EXPORT_OK = qw(command command_oneline command_noisy
53 command_output_pipe command_input_pipe command_close_pipe
8b9150e3 54 version exec_path hash_object git_cmd_try);
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55
56
57=head1 DESCRIPTION
58
59This module provides Perl scripts easy way to interface the Git version control
60system. The modules have an easy and well-tested way to call arbitrary Git
61commands; in the future, the interface will also provide specialized methods
62for doing easily operations which are not totally trivial to do over
63the generic command interface.
64
65While some commands can be executed outside of any context (e.g. 'version'
5c94f87e 66or 'init'), most operations require a repository context, which in practice
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67means 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
69called as methods of the object are then executed in the context of the
70repository.
71
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72Part of the "repository state" is also information about path to the attached
73working copy (unless you work with a bare repository). You can also navigate
74inside of the working copy using the C<wc_chdir()> method. (Note that
75the repository object is self-contained and will not change working directory
76of your process.)
b1edc53d 77
d5c7721d 78TODO: In the future, we might also do
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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 = $remoterepo->refs();
83
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84Currently, the module merely wraps calls to external Git tools. In the future,
85it will provide a much faster way to interact with Git by linking directly
86to libgit. This should be completely opaque to the user, though (performance
87increate nonwithstanding).
88
89=cut
90
91
8b9150e3 92use Carp qw(carp croak); # but croak is bad - throw instead
97b16c06 93use Error qw(:try);
d5c7721d 94use Cwd qw(abs_path);
b1edc53d 95
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96}
97
98
99=head1 CONSTRUCTORS
100
101=over 4
102
103=item repository ( OPTIONS )
104
105=item repository ( DIRECTORY )
106
107=item repository ()
108
109Construct a new repository object.
110C<OPTIONS> are passed in a hash like fashion, using key and value pairs.
111Possible options are:
112
113B<Repository> - Path to the Git repository.
114
115B<WorkingCopy> - Path to the associated working copy; not strictly required
116as many commands will happily crunch on a bare repository.
117
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118B<WorkingSubdir> - Subdirectory in the working copy to work inside.
119Just left undefined if you do not want to limit the scope of operations.
120
121B<Directory> - Path to the Git working directory in its usual setup.
122The C<.git> directory is searched in the directory and all the parent
123directories; if found, C<WorkingCopy> is set to the directory containing
124it and C<Repository> to the C<.git> directory itself. If no C<.git>
125directory was found, the C<Directory> is assumed to be a bare repository,
126C<Repository> is set to point at it and C<WorkingCopy> is left undefined.
127If the C<$GIT_DIR> environment variable is set, things behave as expected
128as well.
b1edc53d 129
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130You should not use both C<Directory> and either of C<Repository> and
131C<WorkingCopy> - the results of that are undefined.
132
133Alternatively, a directory path may be passed as a single scalar argument
134to the constructor; it is equivalent to setting only the C<Directory> option
135field.
136
137Calling the constructor with no options whatsoever is equivalent to
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138calling it with C<< Directory => '.' >>. In general, if you are building
139a standard porcelain command, simply doing C<< Git->repository() >> should
140do the right thing and setup the object to reflect exactly where the user
141is right now.
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142
143=cut
144
145sub 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.
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154 $#args == 0 or throw Error::Simple("bad usage");
155 %opts = ( Directory => $args[0] );
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156 } else {
157 %opts = @args;
158 }
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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 $dir = undef;
175 };
b1edc53d 176
d5c7721d 177 if ($dir) {
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178 $dir =~ m#^/# or $dir = $opts{Directory} . '/' . $dir;
179 $opts{Repository} = $dir;
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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)) = '';
b1edc53d 189 }
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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);
b1edc53d 210 }
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211
212 delete $opts{Directory};
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213 }
214
81a71734 215 $self = { opts => \%opts };
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216 bless $self, $class;
217}
218
219
220=back
221
222=head1 METHODS
223
224=over 4
225
226=item command ( COMMAND [, ARGUMENTS... ] )
227
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228=item command ( [ COMMAND, ARGUMENTS... ], { Opt => Val ... } )
229
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230Execute the given Git C<COMMAND> (specify it without the 'git-'
231prefix), optionally with the specified extra C<ARGUMENTS>.
232
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233The second more elaborate form can be used if you want to further adjust
234the command execution. Currently, only one option is supported:
235
236B<STDERR> - How to deal with the command's error output. By default (C<undef>)
237it is delivered to the caller's C<STDERR>. A false value (0 or '') will cause
238it to be thrown away. If you want to process it, you can get it in a filehandle
239you specify, but you must be extremely careful; if the error output is not
240very short and you want to read it in the same process as where you called
241C<command()>, you are set up for a nice deadlock!
242
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243The method can be called without any instance or on a specified Git repository
244(in that case the command will be run in the repository context).
245
246In scalar context, it returns all the command output in a single string
247(verbatim).
248
249In array context, it returns an array containing lines printed to the
250command's stdout (without trailing newlines).
251
252In both cases, the command's stdin and stderr are the same as the caller's.
253
254=cut
255
256sub command {
d79850e1 257 my ($fh, $ctx) = command_output_pipe(@_);
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258
259 if (not defined wantarray) {
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260 # Nothing to pepper the possible exception with.
261 _cmd_close($fh, $ctx);
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262
263 } elsif (not wantarray) {
264 local $/;
265 my $text = <$fh>;
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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 };
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274 return $text;
275
276 } else {
277 my @lines = <$fh>;
67e4baf8 278 defined and chomp for @lines;
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279 try {
280 _cmd_close($fh, $ctx);
281 } catch Git::Error::Command with {
282 my $E = shift;
283 $E->{'-outputref'} = \@lines;
284 throw $E;
285 };
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286 return @lines;
287 }
288}
289
290
291=item command_oneline ( COMMAND [, ARGUMENTS... ] )
292
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293=item command_oneline ( [ COMMAND, ARGUMENTS... ], { Opt => Val ... } )
294
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295Execute the given C<COMMAND> in the same way as command()
296does but always return a scalar string containing the first line
297of the command's standard output.
298
299=cut
300
301sub command_oneline {
d79850e1 302 my ($fh, $ctx) = command_output_pipe(@_);
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303
304 my $line = <$fh>;
d5c7721d 305 defined $line and chomp $line;
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306 try {
307 _cmd_close($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 };
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314 return $line;
315}
316
317
d79850e1 318=item command_output_pipe ( COMMAND [, ARGUMENTS... ] )
b1edc53d 319
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320=item command_output_pipe ( [ COMMAND, ARGUMENTS... ], { Opt => Val ... } )
321
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322Execute the given C<COMMAND> in the same way as command()
323does but return a pipe filehandle from which the command output can be
324read.
325
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326The function can return C<($pipe, $ctx)> in array context.
327See C<command_close_pipe()> for details.
328
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329=cut
330
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331sub command_output_pipe {
332 _command_common_pipe('-|', @_);
333}
b1edc53d 334
b1edc53d 335
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336=item command_input_pipe ( COMMAND [, ARGUMENTS... ] )
337
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338=item command_input_pipe ( [ COMMAND, ARGUMENTS... ], { Opt => Val ... } )
339
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340Execute the given C<COMMAND> in the same way as command_output_pipe()
341does but return an input pipe filehandle instead; the command output
342is not captured.
343
344The function can return C<($pipe, $ctx)> in array context.
345See C<command_close_pipe()> for details.
346
347=cut
348
349sub command_input_pipe {
350 _command_common_pipe('|-', @_);
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351}
352
353
354=item command_close_pipe ( PIPE [, CTX ] )
355
d79850e1 356Close the C<PIPE> as returned from C<command_*_pipe()>, checking
3dff5379 357whether the command finished successfully. The optional C<CTX> argument
8b9150e3 358is required if you want to see the command name in the error message,
d79850e1 359and it is the second value returned by C<command_*_pipe()> when
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360called in array context. The call idiom is:
361
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362 my ($fh, $ctx) = $r->command_output_pipe('status');
363 while (<$fh>) { ... }
364 $r->command_close_pipe($fh, $ctx);
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365
366Note that you should not rely on whatever actually is in C<CTX>;
367currently it is simply the command name but in future the context might
368have more complicated structure.
369
370=cut
371
372sub command_close_pipe {
373 my ($self, $fh, $ctx) = _maybe_self(@_);
374 $ctx ||= '<unknown>';
375 _cmd_close($fh, $ctx);
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376}
377
378
379=item command_noisy ( COMMAND [, ARGUMENTS... ] )
380
381Execute the given C<COMMAND> in the same way as command() does but do not
382capture the command output - the standard output is not redirected and goes
383to the standard output of the caller application.
384
385While the method is called command_noisy(), you might want to as well use
386it for the most silent Git commands which you know will never pollute your
387stdout but you want to avoid the overhead of the pipe setup when calling them.
388
389The function returns only after the command has finished running.
390
391=cut
392
393sub command_noisy {
394 my ($self, $cmd, @args) = _maybe_self(@_);
d79850e1 395 _check_valid_cmd($cmd);
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396
397 my $pid = fork;
398 if (not defined $pid) {
97b16c06 399 throw Error::Simple("fork failed: $!");
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400 } elsif ($pid == 0) {
401 _cmd_exec($self, $cmd, @args);
402 }
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403 if (waitpid($pid, 0) > 0 and $?>>8 != 0) {
404 throw Git::Error::Command(join(' ', $cmd, @args), $? >> 8);
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405 }
406}
407
408
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409=item version ()
410
411Return the Git version in use.
412
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413=cut
414
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415sub version {
416 my $verstr = command_oneline('--version');
417 $verstr =~ s/^git version //;
418 $verstr;
419}
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420
421
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422=item exec_path ()
423
d5c7721d 424Return path to the Git sub-command executables (the same as
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425C<git --exec-path>). Useful mostly only internally.
426
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427=cut
428
18b0fc1c 429sub exec_path { command_oneline('--exec-path') }
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430
431
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432=item repo_path ()
433
434Return path to the git repository. Must be called on a repository instance.
435
436=cut
437
438sub repo_path { $_[0]->{opts}->{Repository} }
439
440
441=item wc_path ()
442
443Return path to the working copy. Must be called on a repository instance.
444
445=cut
446
447sub wc_path { $_[0]->{opts}->{WorkingCopy} }
448
449
450=item wc_subdir ()
451
452Return path to the subdirectory inside of a working copy. Must be called
453on a repository instance.
454
455=cut
456
457sub wc_subdir { $_[0]->{opts}->{WorkingSubdir} ||= '' }
458
459
460=item wc_chdir ( SUBDIR )
461
462Change the working copy subdirectory to work within. The C<SUBDIR> is
463relative to the working copy root directory (not the current subdirectory).
464Must be called on a repository instance attached to a working copy
465and the directory must exist.
466
467=cut
468
469sub wc_chdir {
470 my ($self, $subdir) = @_;
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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} = $subdir;
480}
481
482
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483=item config ( VARIABLE )
484
e0d10e1c 485Retrieve the configuration C<VARIABLE> in the same manner as C<config>
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486does. In scalar context requires the variable to be set only one time
487(exception is thrown otherwise), in array context returns allows the
488variable to be set multiple times and returns all the values.
489
490Must be called on a repository instance.
491
e0d10e1c 492This currently wraps command('config') so it is not so fast.
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493
494=cut
495
496sub config {
497 my ($self, $var) = @_;
498 $self->repo_path()
499 or throw Error::Simple("not a repository");
500
501 try {
502 if (wantarray) {
e0d10e1c 503 return $self->command('config', '--get-all', $var);
dc2613de 504 } else {
e0d10e1c 505 return $self->command_oneline('config', '--get', $var);
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PB
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 $E;
514 }
515 };
516}
517
518
35c49eea 519=item config_bool ( VARIABLE )
7b9a13ec 520
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PB
521Retrieve the bool configuration C<VARIABLE>. The return value
522is usable as a boolean in perl (and C<undef> if it's not defined,
523of course).
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TT
524
525Must be called on a repository instance.
526
527This currently wraps command('config') so it is not so fast.
528
529=cut
530
35c49eea 531sub config_bool {
7b9a13ec
TT
532 my ($self, $var) = @_;
533 $self->repo_path()
534 or throw Error::Simple("not a repository");
535
536 try {
35c49eea 537 my $val = $self->command_oneline('config', '--bool', '--get',
7b9a13ec 538 $var);
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PB
539 return undef unless defined $val;
540 return $val eq 'true';
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TT
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 $E;
548 }
549 };
550}
551
552
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PB
553=item ident ( TYPE | IDENTSTR )
554
555=item ident_person ( TYPE | IDENTSTR | IDENTARRAY )
556
557This suite of functions retrieves and parses ident information, as stored
558in the commit and tag objects or produced by C<var GIT_type_IDENT> (thus
559C<TYPE> can be either I<author> or I<committer>; case is insignificant).
560
561The C<ident> method retrieves the ident information from C<git-var>
562and either returns it as a scalar string or as an array with the fields parsed.
563Alternatively, it can take a prepared ident string (e.g. from the commit
564object) and just parse it.
565
566C<ident_person> returns the person part of the ident - name and email;
567it can take the same arguments as C<ident> or the array returned by C<ident>.
568
569The synopsis is like:
570
571 my ($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
576Both methods must be called on a repository instance.
577
578=cut
579
580sub 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 $identstr;
592 }
593}
594
595sub ident_person {
596 my ($self, @ident) = @_;
597 $#ident == 0 and @ident = $self->ident($ident[0]);
598 return "$ident[0] <$ident[1]>";
599}
600
601
24c4b714 602=item hash_object ( TYPE, FILENAME )
b1edc53d 603
b1edc53d 604Compute the SHA1 object id of the given C<FILENAME> (or data waiting in
24c4b714
PB
605C<FILEHANDLE>) considering it is of the C<TYPE> object type (C<blob>,
606C<commit>, C<tree>).
b1edc53d 607
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608The method can be called without any instance or on a specified Git repository,
609it makes zero difference.
610
611The function returns the SHA1 hash.
612
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613=cut
614
18b0fc1c 615# TODO: Support for passing FILEHANDLE instead of FILENAME
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616sub hash_object {
617 my ($self, $type, $file) = _maybe_self(@_);
18b0fc1c 618 command_oneline('hash-object', '-t', $type, $file);
e6634ac9 619}
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620
621
8b9150e3 622
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623=back
624
97b16c06 625=head1 ERROR HANDLING
b1edc53d 626
97b16c06 627All functions are supposed to throw Perl exceptions in case of errors.
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628See the L<Error> module on how to catch those. Most exceptions are mere
629L<Error::Simple> instances.
630
631However, the C<command()>, C<command_oneline()> and C<command_noisy()>
632functions suite can throw C<Git::Error::Command> exceptions as well: those are
633thrown when the external command returns an error code and contain the error
634code as well as access to the captured command's output. The exception class
635provides the usual C<stringify> and C<value> (command's exit code) methods and
636in addition also a C<cmd_output> method that returns either an array or a
637string with the captured command output (depending on the original function
638call context; C<command_noisy()> returns C<undef>) and $<cmdline> which
639returns the command and its arguments (but without proper quoting).
640
d79850e1 641Note that the C<command_*_pipe()> functions cannot throw this exception since
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PB
642it has no idea whether the command failed or not. You will only find out
643at the time you C<close> the pipe; if you want to have that automated,
644use 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
696This magical statement will automatically catch any C<Git::Error::Command>
697exceptions thrown by C<CODE> and make your program die with C<ERRMSG>
698on its lips; the message will have %s substituted for the command line
699and %d for the exit status. This statement is useful mostly for producing
700more user-friendly error messages.
701
702In case of no exception caught the statement returns C<CODE>'s return value.
703
704Note that this is the only auto-exported function.
705
706=cut
707
708sub 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 : $result[0];
729}
730
731
732=back
b1edc53d
PB
733
734=head1 COPYRIGHT
735
736Copyright 2006 by Petr Baudis E<lt>pasky@suse.czE<gt>.
737
738This module is free software; it may be used, copied, modified
739and distributed under the terms of the GNU General Public Licence,
740either version 2, or (at your option) any later version.
741
742=cut
743
744
745# Take raw method argument list and return ($obj, @args) in case
746# the method was called upon an instance and (undef, @args) if
747# it was called directly.
748sub _maybe_self {
749 # This breaks inheritance. Oh well.
750 ref $_[0] eq 'Git' ? @_ : (undef, @_);
751}
752
d79850e1
PB
753# Check if the command id is something reasonable.
754sub _check_valid_cmd {
755 my ($cmd) = @_;
756 $cmd =~ /^[a-z0-9A-Z_-]+$/ or throw Error::Simple("bad command: $cmd");
757}
758
759# Common backend for the pipe creators.
760sub _command_common_pipe {
761 my $direction = shift;
d43ba468
PB
762 my ($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 ($cmd, @args) = @p;
769 }
d79850e1
PB
770 _check_valid_cmd($cmd);
771
a6065b54 772 my $fh;
d3b1785f 773 if ($^O eq 'MSWin32') {
a6065b54
PB
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';
bed118d6
AR
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;
a6065b54
PB
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, $cmd, @args);
d43ba468 800 }
d79850e1
PB
801 }
802 return wantarray ? ($fh, join(' ', $cmd, @args)) : $fh;
803}
804
b1edc53d
PB
805# When already in the subprocess, set up the appropriate state
806# for the given repository and execute the git command.
807sub _cmd_exec {
808 my ($self, @args) = @_;
809 if ($self) {
d5c7721d
PB
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());
b1edc53d 813 }
97b16c06 814 _execv_git_cmd(@args);
6aaa65da 815 die qq[exec "@args" failed: $!];
b1edc53d
PB
816}
817
8062f81c
PB
818# Execute the given Git command ($_[0]) with arguments ($_[1..])
819# by searching for it at proper places.
18b0fc1c 820sub _execv_git_cmd { exec('git', @_); }
8062f81c 821
b1edc53d
PB
822# Close pipe to a subprocess.
823sub _cmd_close {
8b9150e3 824 my ($fh, $ctx) = @_;
b1edc53d
PB
825 if (not close $fh) {
826 if ($!) {
827 # It's just close, no point in fatalities
828 carp "error closing pipe: $!";
829 } elsif ($? >> 8) {
8b9150e3
PB
830 # The caller should pepper this.
831 throw Git::Error::Command($ctx, $? >> 8);
b1edc53d
PB
832 }
833 # else we might e.g. closed a live stream; the command
834 # dying of SIGPIPE would drive us here.
835 }
836}
837
838
b1edc53d
PB
839sub DESTROY { }
840
841
a6065b54
PB
842# Pipe implementation for ActiveState Perl.
843
844package Git::activestate_pipe;
845use strict;
846
847sub TIEHANDLE {
848 my ($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
d3b1785f
AR
852 # Let's just hope ActiveState Perl does at least the quoting
853 # correctly.
854 my @data = qx{git @params};
a6065b54
PB
855 bless { i => 0, data => \@data }, $class;
856}
857
858sub READLINE {
859 my $self = shift;
860 if ($self->{i} >= scalar @{$self->{data}}) {
861 return undef;
862 }
2f5b3980
AR
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 ];
a6065b54
PB
870}
871
872sub CLOSE {
873 my $self = shift;
874 delete $self->{data};
875 delete $self->{i};
876}
877
878sub EOF {
879 my $self = shift;
880 return ($self->{i} >= scalar @{$self->{data}});
881}
882
883
b1edc53d 8841; # Famous last words