Linux build: Use sysroot when calculating dependencies

third_party/dpkg-dev/scripts/Dpkg/Version.pm

+# Copyright © Colin Watson <cjwatson@debian.org>
+# Copyright © Ian Jackson <iwj@debian.org>
+# Copyright © 2007 Don Armstrong <don@donarmstrong.com>.
+# Copyright © 2009 Raphaël Hertzog <hertzog@debian.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package Dpkg::Version;
+
+use strict;
+use warnings;
+
+our $VERSION = '1.01';
+
+use Dpkg::ErrorHandling;
+use Dpkg::Gettext;
+
+use Carp;
+use Exporter qw(import);
+our @EXPORT = qw(version_compare version_compare_relation
+                 version_normalize_relation version_compare_string
+                 version_compare_part version_split_digits version_check
+                 REL_LT REL_LE REL_EQ REL_GE REL_GT);
+
+use constant {
+    REL_LT => '<<',
+    REL_LE => '<=',
+    REL_EQ => '=',
+    REL_GE => '>=',
+    REL_GT => '>>',
+};
+
+use overload
+    '<=>' => \&comparison,
+    'cmp' => \&comparison,
+    '""'  => sub { return $_[0]->as_string(); },
+    'bool' => sub { return $_[0]->as_string() if $_[0]->is_valid(); },
+    'fallback' => 1;
+
+=encoding utf8
+
+=head1 NAME
+
+Dpkg::Version - handling and comparing dpkg-style version numbers
+
+=head1 DESCRIPTION
+
+The Dpkg::Version module provides pure-Perl routines to compare
+dpkg-style version numbers (as used in Debian packages) and also
+an object oriented interface overriding perl operators
+to do the right thing when you compare Dpkg::Version object between
+them.
+
+=head1 OBJECT INTERFACE
+
+=over 4
+
+=item my $v = Dpkg::Version->new($version, %opts)
+
+Create a new Dpkg::Version object corresponding to the version indicated in
+the string (scalar) $version. By default it will accepts any string
+and consider it as a valid version. If you pass the option "check => 1",
+it will return undef if the version is invalid (see version_check for
+details).
+
+You can always call $v->is_valid() later on to verify that the version is
+valid.
+
+=cut
+
+sub new {
+    my ($this, $ver, %opts) = @_;
+    my $class = ref($this) || $this;
+    $ver = "$ver" if ref($ver); # Try to stringify objects
+
+    if ($opts{check}) {
+        return unless version_check($ver);
+    }
+
+    my $self = {};
+    if ($ver =~ /^([^:]*):(.+)$/) {
+        $self->{epoch} = $1;
+        $ver = $2;
+    } else {
+        $self->{epoch} = 0;
+        $self->{no_epoch} = 1;
+    }
+    if ($ver =~ /(.*)-(.*)$/) {
+        $self->{version} = $1;
+        $self->{revision} = $2;
+    } else {
+        $self->{version} = $ver;
+        $self->{revision} = 0;
+        $self->{no_revision} = 1;
+    }
+
+    return bless $self, $class;
+}
+
+=item boolean evaluation
+
+When the Dpkg::Version object is used in a boolean evaluation (for example
+in "if ($v)" or "$v || 'default'") it returns its string representation
+if the version stored is valid ($v->is_valid()) and undef otherwise.
+
+=item $v->is_valid()
+
+Returns true if the version is valid, false otherwise.
+
+=cut
+
+sub is_valid {
+    my ($self) = @_;
+    return scalar version_check($self);
+}
+
+=item $v->epoch(), $v->version(), $v->revision()
+
+Returns the corresponding part of the full version string.
+
+=cut
+
+sub epoch {
+    my $self = shift;
+    return $self->{epoch};
+}
+
+sub version {
+    my $self = shift;
+    return $self->{version};
+}
+
+sub revision {
+    my $self = shift;
+    return $self->{revision};
+}
+
+=item $v->is_native()
+
+Returns true if the version is native, false if it has a revision.
+
+=cut
+
+sub is_native {
+    my $self = shift;
+    return $self->{no_revision};
+}
+
+=item $v1 <=> $v2, $v1 < $v2, $v1 <= $v2, $v1 > $v2, $v1 >= $v2
+
+Numerical comparison of various versions numbers. One of the two operands
+needs to be a Dpkg::Version, the other one can be anything provided that
+its string representation is a version number.
+
+=cut
+
+sub comparison {
+    my ($a, $b, $inverted) = @_;
+    if (not ref($b) or not $b->isa('Dpkg::Version')) {
+        $b = Dpkg::Version->new($b);
+    }
+    ($a, $b) = ($b, $a) if $inverted;
+    my $r = version_compare_part($a->epoch(), $b->epoch());
+    return $r if $r;
+    $r = version_compare_part($a->version(), $b->version());
+    return $r if $r;
+    return version_compare_part($a->revision(), $b->revision());
+}
+
+=item "$v", $v->as_string(), $v->as_string(%options)
+
+Accepts an optional option hash reference, affecting the string conversion.
+
+Options:
+
+=over 8
+
+=item omit_epoch (defaults to 0)
+
+Omit the epoch, if present, in the output string.
+
+=item omit_revision (defaults to 0)
+
+Omit the revision, if present, in the output string.
+
+=back
+
+Returns the string representation of the version number.
+
+=cut
+
+sub as_string {
+    my ($self, %opts) = @_;
+    my $no_epoch = $opts{omit_epoch} || $self->{no_epoch};
+    my $no_revision = $opts{omit_revision} || $self->{no_revision};
+
+    my $str = '';
+    $str .= $self->{epoch} . ':' unless $no_epoch;
+    $str .= $self->{version};
+    $str .= '-' . $self->{revision} unless $no_revision;
+    return $str;
+}
+
+=back
+
+=head1 FUNCTIONS
+
+All the functions are exported by default.
+
+=over 4
+
+=item version_compare($a, $b)
+
+Returns -1 if $a is earlier than $b, 0 if they are equal and 1 if $a
+is later than $b.
+
+If $a or $b are not valid version numbers, it dies with an error.
+
+=cut
+
+sub version_compare($$) {
+    my ($a, $b) = @_;
+    my $va = Dpkg::Version->new($a, check => 1);
+    defined($va) || error(_g('%s is not a valid version'), "$a");
+    my $vb = Dpkg::Version->new($b, check => 1);
+    defined($vb) || error(_g('%s is not a valid version'), "$b");
+    return $va <=> $vb;
+}
+
+=item version_compare_relation($a, $rel, $b)
+
+Returns the result (0 or 1) of the given comparison operation. This
+function is implemented on top of version_compare().
+
+Allowed values for $rel are the exported constants REL_GT, REL_GE,
+REL_EQ, REL_LE, REL_LT. Use version_normalize_relation() if you
+have an input string containing the operator.
+
+=cut
+
+sub version_compare_relation($$$) {
+    my ($a, $op, $b) = @_;
+    my $res = version_compare($a, $b);
+
+    if ($op eq REL_GT) {
+        return $res > 0;
+    } elsif ($op eq REL_GE) {
+        return $res >= 0;
+    } elsif ($op eq REL_EQ) {
+        return $res == 0;
+    } elsif ($op eq REL_LE) {
+        return $res <= 0;
+    } elsif ($op eq REL_LT) {
+        return $res < 0;
+    } else {
+        croak "unsupported relation for version_compare_relation(): '$op'";
+    }
+}
+
+=item my $rel = version_normalize_relation($rel_string)
+
+Returns the normalized constant of the relation $rel (a value
+among REL_GT, REL_GE, REL_EQ, REL_LE and REL_LT). Supported
+relations names in input are: "gt", "ge", "eq", "le", "lt", ">>", ">=",
+"=", "<=", "<<". ">" and "<" are also supported but should not be used as
+they are obsolete aliases of ">=" and "<=".
+
+=cut
+
+sub version_normalize_relation($) {
+    my $op = shift;
+
+    warning('relation %s is deprecated: use %s or %s',
+            $op, "$op$op", "$op=") if ($op eq '>' or $op eq '<');
+
+    if ($op eq '>>' or $op eq 'gt') {
+        return REL_GT;
+    } elsif ($op eq '>=' or $op eq 'ge' or $op eq '>') {
+        return REL_GE;
+    } elsif ($op eq '=' or $op eq 'eq') {
+        return REL_EQ;
+    } elsif ($op eq '<=' or $op eq 'le' or $op eq '<') {
+        return REL_LE;
+    } elsif ($op eq '<<' or $op eq 'lt') {
+        return REL_LT;
+    } else {
+        croak "bad relation '$op'";
+    }
+}
+
+=item version_compare_string($a, $b)
+
+String comparison function used for comparing non-numerical parts of version
+numbers. Returns -1 if $a is earlier than $b, 0 if they are equal and 1 if $a
+is later than $b.
+
+The "~" character always sort lower than anything else. Digits sort lower
+than non-digits. Among remaining characters alphabetic characters (A-Za-z)
+sort lower than the other ones. Within each range, the ASCII decimal value
+of the character is used to sort between characters.
+
+=cut
+
+sub _version_order {
+    my ($x) = @_;
+
+    if ($x eq '~') {
+        return -1;
+    } elsif ($x =~ /^\d$/) {
+        return $x * 1 + 1;
+    } elsif ($x =~ /^[A-Za-z]$/) {
+        return ord($x);
+    } else {
+        return ord($x) + 256;
+    }
+}
+
+sub version_compare_string($$) {
+    my @a = map { _version_order($_) } split(//, shift);
+    my @b = map { _version_order($_) } split(//, shift);
+    while (1) {
+        my ($a, $b) = (shift @a, shift @b);
+        return 0 if not defined($a) and not defined($b);
+        $a ||= 0; # Default order for "no character"
+        $b ||= 0;
+        return 1 if $a > $b;
+        return -1 if $a < $b;
+    }
+}
+
+=item version_compare_part($a, $b)
+
+Compare two corresponding sub-parts of a version number (either upstream
+version or debian revision).
+
+Each parameter is split by version_split_digits() and resulting items
+are compared together. As soon as a difference happens, it returns -1 if
+$a is earlier than $b, 0 if they are equal and 1 if $a is later than $b.
+
+=cut
+
+sub version_compare_part($$) {
+    my @a = version_split_digits(shift);
+    my @b = version_split_digits(shift);
+    while (1) {
+        my ($a, $b) = (shift @a, shift @b);
+        return 0 if not defined($a) and not defined($b);
+        $a ||= 0; # Default value for lack of version
+        $b ||= 0;
+        if ($a =~ /^\d+$/ and $b =~ /^\d+$/) {
+            # Numerical comparison
+            my $cmp = $a <=> $b;
+            return $cmp if $cmp;
+        } else {
+            # String comparison
+            my $cmp = version_compare_string($a, $b);
+            return $cmp if $cmp;
+        }
+    }
+}
+
+=item my @items = version_split_digits($version)
+
+Splits a string in items that are each entirely composed either
+of digits or of non-digits. For instance for "1.024~beta1+svn234" it would
+return ("1", ".", "024", "~beta", "1", "+svn", "234").
+
+=cut
+
+sub version_split_digits($) {
+    return split(/(?<=\d)(?=\D)|(?<=\D)(?=\d)/, $_[0]);
+}
+
+=item my ($ok, $msg) = version_check($version)
+
+=item my $ok = version_check($version)
+
+Checks the validity of $version as a version number. Returns 1 in $ok
+if the version is valid, 0 otherwise. In the latter case, $msg
+contains a description of the problem with the $version scalar.
+
+=cut
+
+sub version_check($) {
+    my $version = shift;
+    my $str;
+    if (defined $version) {
+        $str = "$version";
+        $version = Dpkg::Version->new($str) unless ref($version);
+    }
+    if (not defined($str) or not length($str)) {
+        my $msg = _g('version number cannot be empty');
+        return (0, $msg) if wantarray;
+        return 0;
+    }
+    if ($version->version() =~ m/^[^\d]/) {
+        my $msg = _g('version number does not start with digit');
+        return (0, $msg) if wantarray;
+        return 0;
+    }
+    if ($str =~ m/([^-+:.0-9a-zA-Z~])/o) {
+        my $msg = sprintf(_g("version number contains illegal character `%s'"), $1);
+        return (0, $msg) if wantarray;
+        return 0;
+    }
+    if ($version->epoch() !~ /^\d*$/) {
+        my $msg = sprintf(_g('epoch part of the version number ' .
+                             "is not a number: '%s'"), $version->epoch());
+        return (0, $msg) if wantarray;
+        return 0;
+    }
+    return (1, '') if wantarray;
+    return 1;
+}
+
+=back
+
+=head1 CHANGES
+
+=head2 Version 1.01
+
+New argument: Accept an options argument in $v->as_string().
+
+New method: $v->is_native().
+
+=head1 AUTHOR
+
+Don Armstrong <don@donarmstrong.com>, Colin Watson
+<cjwatson@debian.org> and Raphaël Hertzog <hertzog@debian.org>, based on
+the implementation in F<dpkg/lib/version.c> by Ian Jackson and others.
+
+=cut
+
+1;