mirror of
https://github.com/git/git.git
synced 2024-10-30 22:07:53 +01:00
b4c61ed6d3
This is mostly lifted from earlier series by Dan Zwell, but updated to use "git config --get-color" and "git config --get-colorbool" to make it simpler and more consistent with commands written in C. A new configuration color.interactive variable is like color.diff and color.status, and controls if "git-add -i" uses color. A set of configuration variables, color.interactive.<slot>, are used to define what color is used for the prompt, header, and help text. For perl scripts, Git.pm provides $repo->get_color() method, which takes the slot name and the default color, and returns the terminal escape sequence to color the output text. $repo->get_colorbool() method can be used to check if color is set to be used for a given operation. Signed-off-by: Junio C Hamano <gitster@pobox.com>
950 lines
24 KiB
Perl
950 lines
24 KiB
Perl
=head1 NAME
|
|
|
|
Git - Perl interface to the Git version control system
|
|
|
|
=cut
|
|
|
|
|
|
package Git;
|
|
|
|
use strict;
|
|
|
|
|
|
BEGIN {
|
|
|
|
our ($VERSION, @ISA, @EXPORT, @EXPORT_OK);
|
|
|
|
# Totally unstable API.
|
|
$VERSION = '0.01';
|
|
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
use Git;
|
|
|
|
my $version = Git::command_oneline('version');
|
|
|
|
git_cmd_try { Git::command_noisy('update-server-info') }
|
|
'%s failed w/ code %d';
|
|
|
|
my $repo = Git->repository (Directory => '/srv/git/cogito.git');
|
|
|
|
|
|
my @revs = $repo->command('rev-list', '--since=last monday', '--all');
|
|
|
|
my ($fh, $c) = $repo->command_output_pipe('rev-list', '--since=last monday', '--all');
|
|
my $lastrev = <$fh>; chomp $lastrev;
|
|
$repo->command_close_pipe($fh, $c);
|
|
|
|
my $lastrev = $repo->command_oneline( [ 'rev-list', '--all' ],
|
|
STDERR => 0 );
|
|
|
|
=cut
|
|
|
|
|
|
require Exporter;
|
|
|
|
@ISA = qw(Exporter);
|
|
|
|
@EXPORT = qw(git_cmd_try);
|
|
|
|
# Methods which can be called as standalone functions as well:
|
|
@EXPORT_OK = qw(command command_oneline command_noisy
|
|
command_output_pipe command_input_pipe command_close_pipe
|
|
version exec_path hash_object git_cmd_try);
|
|
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
This module provides Perl scripts easy way to interface the Git version control
|
|
system. The modules have an easy and well-tested way to call arbitrary Git
|
|
commands; in the future, the interface will also provide specialized methods
|
|
for doing easily operations which are not totally trivial to do over
|
|
the generic command interface.
|
|
|
|
While some commands can be executed outside of any context (e.g. 'version'
|
|
or 'init'), most operations require a repository context, which in practice
|
|
means getting an instance of the Git object using the repository() constructor.
|
|
(In the future, we will also get a new_repository() constructor.) All commands
|
|
called as methods of the object are then executed in the context of the
|
|
repository.
|
|
|
|
Part of the "repository state" is also information about path to the attached
|
|
working copy (unless you work with a bare repository). You can also navigate
|
|
inside of the working copy using the C<wc_chdir()> method. (Note that
|
|
the repository object is self-contained and will not change working directory
|
|
of your process.)
|
|
|
|
TODO: In the future, we might also do
|
|
|
|
my $remoterepo = $repo->remote_repository (Name => 'cogito', Branch => 'master');
|
|
$remoterepo ||= Git->remote_repository ('http://git.or.cz/cogito.git/');
|
|
my @refs = $remoterepo->refs();
|
|
|
|
Currently, the module merely wraps calls to external Git tools. In the future,
|
|
it will provide a much faster way to interact with Git by linking directly
|
|
to libgit. This should be completely opaque to the user, though (performance
|
|
increate nonwithstanding).
|
|
|
|
=cut
|
|
|
|
|
|
use Carp qw(carp croak); # but croak is bad - throw instead
|
|
use Error qw(:try);
|
|
use Cwd qw(abs_path);
|
|
|
|
}
|
|
|
|
|
|
=head1 CONSTRUCTORS
|
|
|
|
=over 4
|
|
|
|
=item repository ( OPTIONS )
|
|
|
|
=item repository ( DIRECTORY )
|
|
|
|
=item repository ()
|
|
|
|
Construct a new repository object.
|
|
C<OPTIONS> are passed in a hash like fashion, using key and value pairs.
|
|
Possible options are:
|
|
|
|
B<Repository> - Path to the Git repository.
|
|
|
|
B<WorkingCopy> - Path to the associated working copy; not strictly required
|
|
as many commands will happily crunch on a bare repository.
|
|
|
|
B<WorkingSubdir> - Subdirectory in the working copy to work inside.
|
|
Just left undefined if you do not want to limit the scope of operations.
|
|
|
|
B<Directory> - Path to the Git working directory in its usual setup.
|
|
The C<.git> directory is searched in the directory and all the parent
|
|
directories; if found, C<WorkingCopy> is set to the directory containing
|
|
it and C<Repository> to the C<.git> directory itself. If no C<.git>
|
|
directory was found, the C<Directory> is assumed to be a bare repository,
|
|
C<Repository> is set to point at it and C<WorkingCopy> is left undefined.
|
|
If the C<$GIT_DIR> environment variable is set, things behave as expected
|
|
as well.
|
|
|
|
You should not use both C<Directory> and either of C<Repository> and
|
|
C<WorkingCopy> - the results of that are undefined.
|
|
|
|
Alternatively, a directory path may be passed as a single scalar argument
|
|
to the constructor; it is equivalent to setting only the C<Directory> option
|
|
field.
|
|
|
|
Calling the constructor with no options whatsoever is equivalent to
|
|
calling it with C<< Directory => '.' >>. In general, if you are building
|
|
a standard porcelain command, simply doing C<< Git->repository() >> should
|
|
do the right thing and setup the object to reflect exactly where the user
|
|
is right now.
|
|
|
|
=cut
|
|
|
|
sub repository {
|
|
my $class = shift;
|
|
my @args = @_;
|
|
my %opts = ();
|
|
my $self;
|
|
|
|
if (defined $args[0]) {
|
|
if ($#args % 2 != 1) {
|
|
# Not a hash.
|
|
$#args == 0 or throw Error::Simple("bad usage");
|
|
%opts = ( Directory => $args[0] );
|
|
} else {
|
|
%opts = @args;
|
|
}
|
|
}
|
|
|
|
if (not defined $opts{Repository} and not defined $opts{WorkingCopy}) {
|
|
$opts{Directory} ||= '.';
|
|
}
|
|
|
|
if ($opts{Directory}) {
|
|
-d $opts{Directory} or throw Error::Simple("Directory not found: $!");
|
|
|
|
my $search = Git->repository(WorkingCopy => $opts{Directory});
|
|
my $dir;
|
|
try {
|
|
$dir = $search->command_oneline(['rev-parse', '--git-dir'],
|
|
STDERR => 0);
|
|
} catch Git::Error::Command with {
|
|
$dir = undef;
|
|
};
|
|
|
|
if ($dir) {
|
|
$dir =~ m#^/# or $dir = $opts{Directory} . '/' . $dir;
|
|
$opts{Repository} = $dir;
|
|
|
|
# If --git-dir went ok, this shouldn't die either.
|
|
my $prefix = $search->command_oneline('rev-parse', '--show-prefix');
|
|
$dir = abs_path($opts{Directory}) . '/';
|
|
if ($prefix) {
|
|
if (substr($dir, -length($prefix)) ne $prefix) {
|
|
throw Error::Simple("rev-parse confused me - $dir does not have trailing $prefix");
|
|
}
|
|
substr($dir, -length($prefix)) = '';
|
|
}
|
|
$opts{WorkingCopy} = $dir;
|
|
$opts{WorkingSubdir} = $prefix;
|
|
|
|
} else {
|
|
# A bare repository? Let's see...
|
|
$dir = $opts{Directory};
|
|
|
|
unless (-d "$dir/refs" and -d "$dir/objects" and -e "$dir/HEAD") {
|
|
# Mimick git-rev-parse --git-dir error message:
|
|
throw Error::Simple('fatal: Not a git repository');
|
|
}
|
|
my $search = Git->repository(Repository => $dir);
|
|
try {
|
|
$search->command('symbolic-ref', 'HEAD');
|
|
} catch Git::Error::Command with {
|
|
# Mimick git-rev-parse --git-dir error message:
|
|
throw Error::Simple('fatal: Not a git repository');
|
|
}
|
|
|
|
$opts{Repository} = abs_path($dir);
|
|
}
|
|
|
|
delete $opts{Directory};
|
|
}
|
|
|
|
$self = { opts => \%opts };
|
|
bless $self, $class;
|
|
}
|
|
|
|
|
|
=back
|
|
|
|
=head1 METHODS
|
|
|
|
=over 4
|
|
|
|
=item command ( COMMAND [, ARGUMENTS... ] )
|
|
|
|
=item command ( [ COMMAND, ARGUMENTS... ], { Opt => Val ... } )
|
|
|
|
Execute the given Git C<COMMAND> (specify it without the 'git-'
|
|
prefix), optionally with the specified extra C<ARGUMENTS>.
|
|
|
|
The second more elaborate form can be used if you want to further adjust
|
|
the command execution. Currently, only one option is supported:
|
|
|
|
B<STDERR> - How to deal with the command's error output. By default (C<undef>)
|
|
it is delivered to the caller's C<STDERR>. A false value (0 or '') will cause
|
|
it to be thrown away. If you want to process it, you can get it in a filehandle
|
|
you specify, but you must be extremely careful; if the error output is not
|
|
very short and you want to read it in the same process as where you called
|
|
C<command()>, you are set up for a nice deadlock!
|
|
|
|
The method can be called without any instance or on a specified Git repository
|
|
(in that case the command will be run in the repository context).
|
|
|
|
In scalar context, it returns all the command output in a single string
|
|
(verbatim).
|
|
|
|
In array context, it returns an array containing lines printed to the
|
|
command's stdout (without trailing newlines).
|
|
|
|
In both cases, the command's stdin and stderr are the same as the caller's.
|
|
|
|
=cut
|
|
|
|
sub command {
|
|
my ($fh, $ctx) = command_output_pipe(@_);
|
|
|
|
if (not defined wantarray) {
|
|
# Nothing to pepper the possible exception with.
|
|
_cmd_close($fh, $ctx);
|
|
|
|
} elsif (not wantarray) {
|
|
local $/;
|
|
my $text = <$fh>;
|
|
try {
|
|
_cmd_close($fh, $ctx);
|
|
} catch Git::Error::Command with {
|
|
# Pepper with the output:
|
|
my $E = shift;
|
|
$E->{'-outputref'} = \$text;
|
|
throw $E;
|
|
};
|
|
return $text;
|
|
|
|
} else {
|
|
my @lines = <$fh>;
|
|
defined and chomp for @lines;
|
|
try {
|
|
_cmd_close($fh, $ctx);
|
|
} catch Git::Error::Command with {
|
|
my $E = shift;
|
|
$E->{'-outputref'} = \@lines;
|
|
throw $E;
|
|
};
|
|
return @lines;
|
|
}
|
|
}
|
|
|
|
|
|
=item command_oneline ( COMMAND [, ARGUMENTS... ] )
|
|
|
|
=item command_oneline ( [ COMMAND, ARGUMENTS... ], { Opt => Val ... } )
|
|
|
|
Execute the given C<COMMAND> in the same way as command()
|
|
does but always return a scalar string containing the first line
|
|
of the command's standard output.
|
|
|
|
=cut
|
|
|
|
sub command_oneline {
|
|
my ($fh, $ctx) = command_output_pipe(@_);
|
|
|
|
my $line = <$fh>;
|
|
defined $line and chomp $line;
|
|
try {
|
|
_cmd_close($fh, $ctx);
|
|
} catch Git::Error::Command with {
|
|
# Pepper with the output:
|
|
my $E = shift;
|
|
$E->{'-outputref'} = \$line;
|
|
throw $E;
|
|
};
|
|
return $line;
|
|
}
|
|
|
|
|
|
=item command_output_pipe ( COMMAND [, ARGUMENTS... ] )
|
|
|
|
=item command_output_pipe ( [ COMMAND, ARGUMENTS... ], { Opt => Val ... } )
|
|
|
|
Execute the given C<COMMAND> in the same way as command()
|
|
does but return a pipe filehandle from which the command output can be
|
|
read.
|
|
|
|
The function can return C<($pipe, $ctx)> in array context.
|
|
See C<command_close_pipe()> for details.
|
|
|
|
=cut
|
|
|
|
sub command_output_pipe {
|
|
_command_common_pipe('-|', @_);
|
|
}
|
|
|
|
|
|
=item command_input_pipe ( COMMAND [, ARGUMENTS... ] )
|
|
|
|
=item command_input_pipe ( [ COMMAND, ARGUMENTS... ], { Opt => Val ... } )
|
|
|
|
Execute the given C<COMMAND> in the same way as command_output_pipe()
|
|
does but return an input pipe filehandle instead; the command output
|
|
is not captured.
|
|
|
|
The function can return C<($pipe, $ctx)> in array context.
|
|
See C<command_close_pipe()> for details.
|
|
|
|
=cut
|
|
|
|
sub command_input_pipe {
|
|
_command_common_pipe('|-', @_);
|
|
}
|
|
|
|
|
|
=item command_close_pipe ( PIPE [, CTX ] )
|
|
|
|
Close the C<PIPE> as returned from C<command_*_pipe()>, checking
|
|
whether the command finished successfully. The optional C<CTX> argument
|
|
is required if you want to see the command name in the error message,
|
|
and it is the second value returned by C<command_*_pipe()> when
|
|
called in array context. The call idiom is:
|
|
|
|
my ($fh, $ctx) = $r->command_output_pipe('status');
|
|
while (<$fh>) { ... }
|
|
$r->command_close_pipe($fh, $ctx);
|
|
|
|
Note that you should not rely on whatever actually is in C<CTX>;
|
|
currently it is simply the command name but in future the context might
|
|
have more complicated structure.
|
|
|
|
=cut
|
|
|
|
sub command_close_pipe {
|
|
my ($self, $fh, $ctx) = _maybe_self(@_);
|
|
$ctx ||= '<unknown>';
|
|
_cmd_close($fh, $ctx);
|
|
}
|
|
|
|
|
|
=item command_noisy ( COMMAND [, ARGUMENTS... ] )
|
|
|
|
Execute the given C<COMMAND> in the same way as command() does but do not
|
|
capture the command output - the standard output is not redirected and goes
|
|
to the standard output of the caller application.
|
|
|
|
While the method is called command_noisy(), you might want to as well use
|
|
it for the most silent Git commands which you know will never pollute your
|
|
stdout but you want to avoid the overhead of the pipe setup when calling them.
|
|
|
|
The function returns only after the command has finished running.
|
|
|
|
=cut
|
|
|
|
sub command_noisy {
|
|
my ($self, $cmd, @args) = _maybe_self(@_);
|
|
_check_valid_cmd($cmd);
|
|
|
|
my $pid = fork;
|
|
if (not defined $pid) {
|
|
throw Error::Simple("fork failed: $!");
|
|
} elsif ($pid == 0) {
|
|
_cmd_exec($self, $cmd, @args);
|
|
}
|
|
if (waitpid($pid, 0) > 0 and $?>>8 != 0) {
|
|
throw Git::Error::Command(join(' ', $cmd, @args), $? >> 8);
|
|
}
|
|
}
|
|
|
|
|
|
=item version ()
|
|
|
|
Return the Git version in use.
|
|
|
|
=cut
|
|
|
|
sub version {
|
|
my $verstr = command_oneline('--version');
|
|
$verstr =~ s/^git version //;
|
|
$verstr;
|
|
}
|
|
|
|
|
|
=item exec_path ()
|
|
|
|
Return path to the Git sub-command executables (the same as
|
|
C<git --exec-path>). Useful mostly only internally.
|
|
|
|
=cut
|
|
|
|
sub exec_path { command_oneline('--exec-path') }
|
|
|
|
|
|
=item repo_path ()
|
|
|
|
Return path to the git repository. Must be called on a repository instance.
|
|
|
|
=cut
|
|
|
|
sub repo_path { $_[0]->{opts}->{Repository} }
|
|
|
|
|
|
=item wc_path ()
|
|
|
|
Return path to the working copy. Must be called on a repository instance.
|
|
|
|
=cut
|
|
|
|
sub wc_path { $_[0]->{opts}->{WorkingCopy} }
|
|
|
|
|
|
=item wc_subdir ()
|
|
|
|
Return path to the subdirectory inside of a working copy. Must be called
|
|
on a repository instance.
|
|
|
|
=cut
|
|
|
|
sub wc_subdir { $_[0]->{opts}->{WorkingSubdir} ||= '' }
|
|
|
|
|
|
=item wc_chdir ( SUBDIR )
|
|
|
|
Change the working copy subdirectory to work within. The C<SUBDIR> is
|
|
relative to the working copy root directory (not the current subdirectory).
|
|
Must be called on a repository instance attached to a working copy
|
|
and the directory must exist.
|
|
|
|
=cut
|
|
|
|
sub wc_chdir {
|
|
my ($self, $subdir) = @_;
|
|
$self->wc_path()
|
|
or throw Error::Simple("bare repository");
|
|
|
|
-d $self->wc_path().'/'.$subdir
|
|
or throw Error::Simple("subdir not found: $!");
|
|
# Of course we will not "hold" the subdirectory so anyone
|
|
# can delete it now and we will never know. But at least we tried.
|
|
|
|
$self->{opts}->{WorkingSubdir} = $subdir;
|
|
}
|
|
|
|
|
|
=item config ( VARIABLE )
|
|
|
|
Retrieve the configuration C<VARIABLE> in the same manner as C<config>
|
|
does. In scalar context requires the variable to be set only one time
|
|
(exception is thrown otherwise), in array context returns allows the
|
|
variable to be set multiple times and returns all the values.
|
|
|
|
Must be called on a repository instance.
|
|
|
|
This currently wraps command('config') so it is not so fast.
|
|
|
|
=cut
|
|
|
|
sub config {
|
|
my ($self, $var) = @_;
|
|
$self->repo_path()
|
|
or throw Error::Simple("not a repository");
|
|
|
|
try {
|
|
if (wantarray) {
|
|
return $self->command('config', '--get-all', $var);
|
|
} else {
|
|
return $self->command_oneline('config', '--get', $var);
|
|
}
|
|
} catch Git::Error::Command with {
|
|
my $E = shift;
|
|
if ($E->value() == 1) {
|
|
# Key not found.
|
|
return undef;
|
|
} else {
|
|
throw $E;
|
|
}
|
|
};
|
|
}
|
|
|
|
|
|
=item config_bool ( VARIABLE )
|
|
|
|
Retrieve the bool configuration C<VARIABLE>. The return value
|
|
is usable as a boolean in perl (and C<undef> if it's not defined,
|
|
of course).
|
|
|
|
Must be called on a repository instance.
|
|
|
|
This currently wraps command('config') so it is not so fast.
|
|
|
|
=cut
|
|
|
|
sub config_bool {
|
|
my ($self, $var) = @_;
|
|
$self->repo_path()
|
|
or throw Error::Simple("not a repository");
|
|
|
|
try {
|
|
my $val = $self->command_oneline('config', '--bool', '--get',
|
|
$var);
|
|
return undef unless defined $val;
|
|
return $val eq 'true';
|
|
} catch Git::Error::Command with {
|
|
my $E = shift;
|
|
if ($E->value() == 1) {
|
|
# Key not found.
|
|
return undef;
|
|
} else {
|
|
throw $E;
|
|
}
|
|
};
|
|
}
|
|
|
|
=item config_int ( VARIABLE )
|
|
|
|
Retrieve the integer configuration C<VARIABLE>. The return value
|
|
is simple decimal number. An optional value suffix of 'k', 'm',
|
|
or 'g' in the config file will cause the value to be multiplied
|
|
by 1024, 1048576 (1024^2), or 1073741824 (1024^3) prior to output.
|
|
It would return C<undef> if configuration variable is not defined,
|
|
|
|
Must be called on a repository instance.
|
|
|
|
This currently wraps command('config') so it is not so fast.
|
|
|
|
=cut
|
|
|
|
sub config_int {
|
|
my ($self, $var) = @_;
|
|
$self->repo_path()
|
|
or throw Error::Simple("not a repository");
|
|
|
|
try {
|
|
return $self->command_oneline('config', '--int', '--get', $var);
|
|
} catch Git::Error::Command with {
|
|
my $E = shift;
|
|
if ($E->value() == 1) {
|
|
# Key not found.
|
|
return undef;
|
|
} else {
|
|
throw $E;
|
|
}
|
|
};
|
|
}
|
|
|
|
=item get_colorbool ( NAME )
|
|
|
|
Finds if color should be used for NAMEd operation from the configuration,
|
|
and returns boolean (true for "use color", false for "do not use color").
|
|
|
|
=cut
|
|
|
|
sub get_colorbool {
|
|
my ($self, $var) = @_;
|
|
my $stdout_to_tty = (-t STDOUT) ? "true" : "false";
|
|
my $use_color = $self->command_oneline('config', '--get-colorbool',
|
|
$var, $stdout_to_tty);
|
|
return ($use_color eq 'true');
|
|
}
|
|
|
|
=item get_color ( SLOT, COLOR )
|
|
|
|
Finds color for SLOT from the configuration, while defaulting to COLOR,
|
|
and returns the ANSI color escape sequence:
|
|
|
|
print $repo->get_color("color.interactive.prompt", "underline blue white");
|
|
print "some text";
|
|
print $repo->get_color("", "normal");
|
|
|
|
=cut
|
|
|
|
sub get_color {
|
|
my ($self, $slot, $default) = @_;
|
|
my $color = $self->command_oneline('config', '--get-color', $slot, $default);
|
|
if (!defined $color) {
|
|
$color = "";
|
|
}
|
|
return $color;
|
|
}
|
|
|
|
=item ident ( TYPE | IDENTSTR )
|
|
|
|
=item ident_person ( TYPE | IDENTSTR | IDENTARRAY )
|
|
|
|
This suite of functions retrieves and parses ident information, as stored
|
|
in the commit and tag objects or produced by C<var GIT_type_IDENT> (thus
|
|
C<TYPE> can be either I<author> or I<committer>; case is insignificant).
|
|
|
|
The C<ident> method retrieves the ident information from C<git-var>
|
|
and either returns it as a scalar string or as an array with the fields parsed.
|
|
Alternatively, it can take a prepared ident string (e.g. from the commit
|
|
object) and just parse it.
|
|
|
|
C<ident_person> returns the person part of the ident - name and email;
|
|
it can take the same arguments as C<ident> or the array returned by C<ident>.
|
|
|
|
The synopsis is like:
|
|
|
|
my ($name, $email, $time_tz) = ident('author');
|
|
"$name <$email>" eq ident_person('author');
|
|
"$name <$email>" eq ident_person($name);
|
|
$time_tz =~ /^\d+ [+-]\d{4}$/;
|
|
|
|
Both methods must be called on a repository instance.
|
|
|
|
=cut
|
|
|
|
sub ident {
|
|
my ($self, $type) = @_;
|
|
my $identstr;
|
|
if (lc $type eq lc 'committer' or lc $type eq lc 'author') {
|
|
$identstr = $self->command_oneline('var', 'GIT_'.uc($type).'_IDENT');
|
|
} else {
|
|
$identstr = $type;
|
|
}
|
|
if (wantarray) {
|
|
return $identstr =~ /^(.*) <(.*)> (\d+ [+-]\d{4})$/;
|
|
} else {
|
|
return $identstr;
|
|
}
|
|
}
|
|
|
|
sub ident_person {
|
|
my ($self, @ident) = @_;
|
|
$#ident == 0 and @ident = $self->ident($ident[0]);
|
|
return "$ident[0] <$ident[1]>";
|
|
}
|
|
|
|
|
|
=item hash_object ( TYPE, FILENAME )
|
|
|
|
Compute the SHA1 object id of the given C<FILENAME> (or data waiting in
|
|
C<FILEHANDLE>) considering it is of the C<TYPE> object type (C<blob>,
|
|
C<commit>, C<tree>).
|
|
|
|
The method can be called without any instance or on a specified Git repository,
|
|
it makes zero difference.
|
|
|
|
The function returns the SHA1 hash.
|
|
|
|
=cut
|
|
|
|
# TODO: Support for passing FILEHANDLE instead of FILENAME
|
|
sub hash_object {
|
|
my ($self, $type, $file) = _maybe_self(@_);
|
|
command_oneline('hash-object', '-t', $type, $file);
|
|
}
|
|
|
|
|
|
|
|
=back
|
|
|
|
=head1 ERROR HANDLING
|
|
|
|
All functions are supposed to throw Perl exceptions in case of errors.
|
|
See the L<Error> module on how to catch those. Most exceptions are mere
|
|
L<Error::Simple> instances.
|
|
|
|
However, the C<command()>, C<command_oneline()> and C<command_noisy()>
|
|
functions suite can throw C<Git::Error::Command> exceptions as well: those are
|
|
thrown when the external command returns an error code and contain the error
|
|
code as well as access to the captured command's output. The exception class
|
|
provides the usual C<stringify> and C<value> (command's exit code) methods and
|
|
in addition also a C<cmd_output> method that returns either an array or a
|
|
string with the captured command output (depending on the original function
|
|
call context; C<command_noisy()> returns C<undef>) and $<cmdline> which
|
|
returns the command and its arguments (but without proper quoting).
|
|
|
|
Note that the C<command_*_pipe()> functions cannot throw this exception since
|
|
it has no idea whether the command failed or not. You will only find out
|
|
at the time you C<close> the pipe; if you want to have that automated,
|
|
use C<command_close_pipe()>, which can throw the exception.
|
|
|
|
=cut
|
|
|
|
{
|
|
package Git::Error::Command;
|
|
|
|
@Git::Error::Command::ISA = qw(Error);
|
|
|
|
sub new {
|
|
my $self = shift;
|
|
my $cmdline = '' . shift;
|
|
my $value = 0 + shift;
|
|
my $outputref = shift;
|
|
my(@args) = ();
|
|
|
|
local $Error::Depth = $Error::Depth + 1;
|
|
|
|
push(@args, '-cmdline', $cmdline);
|
|
push(@args, '-value', $value);
|
|
push(@args, '-outputref', $outputref);
|
|
|
|
$self->SUPER::new(-text => 'command returned error', @args);
|
|
}
|
|
|
|
sub stringify {
|
|
my $self = shift;
|
|
my $text = $self->SUPER::stringify;
|
|
$self->cmdline() . ': ' . $text . ': ' . $self->value() . "\n";
|
|
}
|
|
|
|
sub cmdline {
|
|
my $self = shift;
|
|
$self->{'-cmdline'};
|
|
}
|
|
|
|
sub cmd_output {
|
|
my $self = shift;
|
|
my $ref = $self->{'-outputref'};
|
|
defined $ref or undef;
|
|
if (ref $ref eq 'ARRAY') {
|
|
return @$ref;
|
|
} else { # SCALAR
|
|
return $$ref;
|
|
}
|
|
}
|
|
}
|
|
|
|
=over 4
|
|
|
|
=item git_cmd_try { CODE } ERRMSG
|
|
|
|
This magical statement will automatically catch any C<Git::Error::Command>
|
|
exceptions thrown by C<CODE> and make your program die with C<ERRMSG>
|
|
on its lips; the message will have %s substituted for the command line
|
|
and %d for the exit status. This statement is useful mostly for producing
|
|
more user-friendly error messages.
|
|
|
|
In case of no exception caught the statement returns C<CODE>'s return value.
|
|
|
|
Note that this is the only auto-exported function.
|
|
|
|
=cut
|
|
|
|
sub git_cmd_try(&$) {
|
|
my ($code, $errmsg) = @_;
|
|
my @result;
|
|
my $err;
|
|
my $array = wantarray;
|
|
try {
|
|
if ($array) {
|
|
@result = &$code;
|
|
} else {
|
|
$result[0] = &$code;
|
|
}
|
|
} catch Git::Error::Command with {
|
|
my $E = shift;
|
|
$err = $errmsg;
|
|
$err =~ s/\%s/$E->cmdline()/ge;
|
|
$err =~ s/\%d/$E->value()/ge;
|
|
# We can't croak here since Error.pm would mangle
|
|
# that to Error::Simple.
|
|
};
|
|
$err and croak $err;
|
|
return $array ? @result : $result[0];
|
|
}
|
|
|
|
|
|
=back
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2006 by Petr Baudis E<lt>pasky@suse.czE<gt>.
|
|
|
|
This module is free software; it may be used, copied, modified
|
|
and distributed under the terms of the GNU General Public Licence,
|
|
either version 2, or (at your option) any later version.
|
|
|
|
=cut
|
|
|
|
|
|
# Take raw method argument list and return ($obj, @args) in case
|
|
# the method was called upon an instance and (undef, @args) if
|
|
# it was called directly.
|
|
sub _maybe_self {
|
|
# This breaks inheritance. Oh well.
|
|
ref $_[0] eq 'Git' ? @_ : (undef, @_);
|
|
}
|
|
|
|
# Check if the command id is something reasonable.
|
|
sub _check_valid_cmd {
|
|
my ($cmd) = @_;
|
|
$cmd =~ /^[a-z0-9A-Z_-]+$/ or throw Error::Simple("bad command: $cmd");
|
|
}
|
|
|
|
# Common backend for the pipe creators.
|
|
sub _command_common_pipe {
|
|
my $direction = shift;
|
|
my ($self, @p) = _maybe_self(@_);
|
|
my (%opts, $cmd, @args);
|
|
if (ref $p[0]) {
|
|
($cmd, @args) = @{shift @p};
|
|
%opts = ref $p[0] ? %{$p[0]} : @p;
|
|
} else {
|
|
($cmd, @args) = @p;
|
|
}
|
|
_check_valid_cmd($cmd);
|
|
|
|
my $fh;
|
|
if ($^O eq 'MSWin32') {
|
|
# ActiveState Perl
|
|
#defined $opts{STDERR} and
|
|
# warn 'ignoring STDERR option - running w/ ActiveState';
|
|
$direction eq '-|' or
|
|
die 'input pipe for ActiveState not implemented';
|
|
# the strange construction with *ACPIPE is just to
|
|
# explain the tie below that we want to bind to
|
|
# a handle class, not scalar. It is not known if
|
|
# it is something specific to ActiveState Perl or
|
|
# just a Perl quirk.
|
|
tie (*ACPIPE, 'Git::activestate_pipe', $cmd, @args);
|
|
$fh = *ACPIPE;
|
|
|
|
} else {
|
|
my $pid = open($fh, $direction);
|
|
if (not defined $pid) {
|
|
throw Error::Simple("open failed: $!");
|
|
} elsif ($pid == 0) {
|
|
if (defined $opts{STDERR}) {
|
|
close STDERR;
|
|
}
|
|
if ($opts{STDERR}) {
|
|
open (STDERR, '>&', $opts{STDERR})
|
|
or die "dup failed: $!";
|
|
}
|
|
_cmd_exec($self, $cmd, @args);
|
|
}
|
|
}
|
|
return wantarray ? ($fh, join(' ', $cmd, @args)) : $fh;
|
|
}
|
|
|
|
# When already in the subprocess, set up the appropriate state
|
|
# for the given repository and execute the git command.
|
|
sub _cmd_exec {
|
|
my ($self, @args) = @_;
|
|
if ($self) {
|
|
$self->repo_path() and $ENV{'GIT_DIR'} = $self->repo_path();
|
|
$self->wc_path() and chdir($self->wc_path());
|
|
$self->wc_subdir() and chdir($self->wc_subdir());
|
|
}
|
|
_execv_git_cmd(@args);
|
|
die qq[exec "@args" failed: $!];
|
|
}
|
|
|
|
# Execute the given Git command ($_[0]) with arguments ($_[1..])
|
|
# by searching for it at proper places.
|
|
sub _execv_git_cmd { exec('git', @_); }
|
|
|
|
# Close pipe to a subprocess.
|
|
sub _cmd_close {
|
|
my ($fh, $ctx) = @_;
|
|
if (not close $fh) {
|
|
if ($!) {
|
|
# It's just close, no point in fatalities
|
|
carp "error closing pipe: $!";
|
|
} elsif ($? >> 8) {
|
|
# The caller should pepper this.
|
|
throw Git::Error::Command($ctx, $? >> 8);
|
|
}
|
|
# else we might e.g. closed a live stream; the command
|
|
# dying of SIGPIPE would drive us here.
|
|
}
|
|
}
|
|
|
|
|
|
sub DESTROY { }
|
|
|
|
|
|
# Pipe implementation for ActiveState Perl.
|
|
|
|
package Git::activestate_pipe;
|
|
use strict;
|
|
|
|
sub TIEHANDLE {
|
|
my ($class, @params) = @_;
|
|
# FIXME: This is probably horrible idea and the thing will explode
|
|
# at the moment you give it arguments that require some quoting,
|
|
# but I have no ActiveState clue... --pasky
|
|
# Let's just hope ActiveState Perl does at least the quoting
|
|
# correctly.
|
|
my @data = qx{git @params};
|
|
bless { i => 0, data => \@data }, $class;
|
|
}
|
|
|
|
sub READLINE {
|
|
my $self = shift;
|
|
if ($self->{i} >= scalar @{$self->{data}}) {
|
|
return undef;
|
|
}
|
|
my $i = $self->{i};
|
|
if (wantarray) {
|
|
$self->{i} = $#{$self->{'data'}} + 1;
|
|
return splice(@{$self->{'data'}}, $i);
|
|
}
|
|
$self->{i} = $i + 1;
|
|
return $self->{'data'}->[ $i ];
|
|
}
|
|
|
|
sub CLOSE {
|
|
my $self = shift;
|
|
delete $self->{data};
|
|
delete $self->{i};
|
|
}
|
|
|
|
sub EOF {
|
|
my $self = shift;
|
|
return ($self->{i} >= scalar @{$self->{data}});
|
|
}
|
|
|
|
|
|
1; # Famous last words
|