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|
package Apbuild::Utils;
use strict;
use warnings;
use Exporter;
use base qw(Exporter);
use IO::Handle;
use IPC::Open2;
use POSIX;
use Cwd qw(abs_path);
our @EXPORT = qw(debug error checkCommand empty homeDir searchLib searchStaticLib soname run parseDataFile writeDataFile);
our $debugOpened = 0;
##
# debug(message)
#
# If the environment variable $APBUILD_DEBUG is set to 1,
# then print a debugging message to /dev/tty (not stdout or stderr).
sub debug {
return if (empty($ENV{APBUILD_DEBUG}) || !$ENV{APBUILD_DEBUG});
if (!$debugOpened) {
if (open DEBUG, '>/dev/tty') {
$debugOpened = 1;
} else {
return;
}
}
my @args = split /\n/, "@_";
foreach (@args) {
$_ = '# ' . $_;
$_ .= "\n";
}
print DEBUG "\033[1;33m";
print DEBUG join '', @args;
print DEBUG "\033[0m";
DEBUG->flush;
}
##
# error(message)
#
# Print an error message to stderr. It will be displayed in red.
sub error {
print STDERR "\033[1;31m";
print STDERR $_[0];
print STDERR "\033[0m";
STDERR->flush;
}
##
# checkCommand(file)
# file: an command's filename.
# Returns: the full path to $file, or undef if $file is not a valid command.
#
# Checks whether $file is an executable which is in $PATH or the working directory.
#
# Example:
# checkCommand('gcc'); # Returns "/usr/bin/gcc"
sub checkCommand {
my ($file, $file2) = split / /, $_[0];
$file = $file2 if ($file =~ /ccache/);
return abs_path($file) if (-x $file);
foreach my $dir (split /:+/, $ENV{PATH}) {
if (-x "$dir/$file") {
return "$dir/$file";
}
}
return undef;
}
##
# empty(str)
#
# Checks whether $str is undefined or empty.
sub empty {
return !defined($_[0]) || $_[0] eq '';
}
##
# homeDir()
#
# Returns the user's home folder.
sub homeDir {
if (!$ENV{HOME}) {
my $user = getpwuid(POSIX::getuid());
$ENV{HOME} = (getpwnam($user))[7];
}
return $ENV{HOME};
}
##
# searchLib(basename, [extra_paths])
# basename: the base name of the library.
# extra_paths: a reference to an array, which contains extra folders in which to look for the library.
# Returns: the absolute path to the library, or undef if not found.
#
# Get the absolute path of a (static or shared) library.
#
# Example:
# searchLib("libfoo.so.1"); # Returns "/usr/lib/libfoo.so.1"
sub searchLib {
my ($basename, $extra_paths) = @_;
if ($extra_paths) {
foreach my $path (reverse(@{$extra_paths})) {
return "$path/$basename" if (-f "$path/$basename");
}
}
foreach my $path ('/usr/local/lib', '/lib', '/usr/lib') {
return "$path/$basename" if (-f "$path/$basename");
}
return undef;
}
##
# soname(lib)
# lib: a filename to a shared library.
# Returns: the soname.
#
# Get the soname of the specified shared library by reading
# the SONAME section of the shared library file.
sub soname {
my ($lib) = @_;
my ($r, $w);
if (open2($r, $w, 'objdump', '-p', $lib)) {
close $w;
my @lines = <$r>;
close $r;
my ($soname) = grep {/SONAME/} @lines;
$soname =~ s/.*?SONAME[ \t]+//;
$soname =~ s/\n//gs;
return $soname;
} else {
my ($soname) = $lib =~ /.*\/lib(.+)\.so/;
return $soname;
}
}
##
# run(args...)
# Returns: the command's exit code.
#
# Run a command with system().
sub run {
# split the first item in @_ into "words". The `printf ...`
# takes care of respecting ' and " quotes so we don't split a
# quoted string that contains whitespace. If $cmd itself
# contains \n, this will still go wrong.
my $cmd = shift @_;
my @words = `printf '%s\n' $cmd`;
chomp @words;
my $status = system(@words, @_);
return 127 if ($status == -1);
return $status / 256 if ($status != 0);
return 0;
}
sub parseDataFile {
my ($file, $r_hash) = @_;
%{$r_hash} = ();
return if (!open FILE, "< $file");
foreach (<FILE>) {
next if (/^#/);
s/[\r\n]//g;
next if (length($_) == 0);
my ($key, $value) = split / /, $_, 2;
$r_hash->{$key} = $value;
}
close FILE;
}
sub writeDataFile {
my ($file, $r_hash) = @_;
return if (!open FILE, "> $file");
foreach my $key (sort(keys %{$r_hash})) {
print FILE "$key $r_hash->{$key}\n";
}
close FILE;
}
1;
|
