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Dpkg::Version(3perl) libdpkg-perl Dpkg::Version(3perl)

Dpkg::Version - handling and comparing dpkg-style version numbers

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.

$v = Dpkg::Version->new($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 $v-> is_valid() later on to verify that the version is valid.
boolean evaluation
When the Dpkg::Version object is used in a boolean evaluation (for example in "if ($v)" or "$v ? \"$v\" : 'default'") it returns true if the version stored is valid ($v-> is_valid()) and false otherwise.
Notice: Between dpkg and 1.19.1 this overload used to return $v-> as_string() if $v->is_valid(), a breaking change in behavior that caused "0" versions to be evaluated as false. To catch any possibly intended code that relied on those semantics, this overload will emit a warning with category "Dpkg::Version::semantic_change::overload::bool" until dpkg 1.20.x. Once fixed, or for already valid code the warning can be quiesced with
  no if $Dpkg::Version::VERSION ge '1.02',
     warnings => qw(Dpkg::Version::semantic_change::overload::bool);
added after the "use Dpkg::Version".
Returns true if the version is valid, false otherwise.
$v->epoch(), $v->version(), $v->revision()
Returns the corresponding part of the full version string.
Returns true if the version is native, false if it has a revision.
$v1 <=> $v2, $v1 < $v2, $v1 <= $v2, $v1 > $v2, $v1 >= $v2
Numerical comparison of various versions numbers. One of the two operands needs to be a Dpkg::Version, the other one can be anything provided that its string representation is a version number.
"$v", $v->as_string(), $v->as_string(%options)
Accepts an optional option hash reference, affecting the string conversion.
omit_epoch (defaults to 0)
Omit the epoch, if present, in the output string.
omit_revision (defaults to 0)
Omit the revision, if present, in the output string.
Returns the string representation of the version number.

All the functions are exported by default.
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 $b are not valid version numbers, it dies with an error.
version_compare_relation($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.
$rel = version_normalize_relation($rel_string)
Returns the normalized constant of the relation $rel (a value among REL_GT, REL_GE, REL_EQ, REL_LE and REL_LT). Supported relations names in input are: "gt", "ge", "eq", "le", "lt", ">>", ">=", "=", "<=", "<<". ">" and "<" are also supported but should not be used as they are obsolete aliases of ">=" and "<=".
version_compare_string($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 $b.
The "~" character always sort lower than anything else. Digits sort lower than non-digits. Among remaining characters alphabetic characters (A-Z, a-z) sort lower than the other ones. Within each range, the ASCII decimal value of the character is used to sort between characters.
version_compare_part($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 $b.
@items = version_split_digits($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").
($ok, $msg) = version_check($version)
$ok = version_check($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.

Semantic change: bool evaluation semantics restored to their original behavior.

New argument: Accept an options argument in $v-> as_string().
New method: $v-> is_native().

Mark the module as public.
2018-10-07 1.19.2

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