Dpkg::Checksums(3perl) libdpkg-perl Dpkg::Checksums(3perl)
NAME
Dpkg::Checksums - generate and manipulate file checksums
DESCRIPTION
This module provides a class that can generate and manipulate various
file checksums as well as some methods to query information about
supported checksums.
FUNCTIONS
@list = checksums_get_list()
Returns the list of supported checksums algorithms.
$bool = checksums_is_supported($alg)
Returns a boolean indicating whether the given checksum algorithm is
supported. The checksum algorithm is case-insensitive.
$value = checksums_get_property($alg, $property)
Returns the requested property of the checksum algorithm. Returns
undef if either the property or the checksum algorithm doesn't
exist. Valid properties currently include "name" (returns the name
of the digest algorithm), "regex" for the regular expression
describing the common string representation of the checksum, and
"strong" for a boolean describing whether the checksum algorithm is
considered cryptographically strong.
METHODS
$ck = Dpkg::Checksums->new()
Create a new Dpkg::Checksums object. This object is able to store
the checksums of several files to later export them or verify them.
$ck->reset()
Forget about all checksums stored. The object is again in the same
state as if it was newly created.
$ck->add_from_file($filename, %opts)
Add or verify checksums information for the file $filename. The file
must exists for the call to succeed. By default if the $filename is
known and the checksums do not match, the function will error out.
Options:
key Set to the public name to use when exporting the checksums,
instead of using $filename.
checksums
Set an array reference with the list of wanted checksums to
generate instead of generating all of them.
update
Set a boolean on whether the object should update the checksums
information associated with the $filename (or key), instead of
emitting an error if it does not match.
$ck->add_from_string($alg, $value, %opts)
Add checksums of type $alg that are stored in the $value variable.
$value can be multi-lines, each line should be a space separated
list of checksum, file size and filename. Leading or trailing spaces
are not allowed.
Options:
update
Set a boolean on whether the object should update the checksums
information associated with the $filename (or key), instead of
emitting an error if it does not match.
$ck->add_from_control($control, %opts)
Read checksums from Checksums-* fields stored in the Dpkg::Control
object $control. It uses $self->add_from_string() on the field
values to do the actual work. The default field used is
Checksums-Md5.
Options:
use_files_for_md5
Set to true to use the Files field instead of Checksums-Md5.
Defaults to false.
@files = $ck->get_files()
Return the list of files whose checksums are stored in the object.
$bool = $ck->has_file($file)
Return true if we have checksums for the given file. Returns false
otherwise.
$ck->remove_file($file)
Remove all checksums of the given file.
$checksum = $ck->get_checksum($file, $alg)
Return the checksum of type $alg for the requested $file. This will
not compute the checksum but only return the checksum stored in the
object, if any.
If $alg is not defined, it returns a reference to a hash: keys are
the checksum algorithms and values are the checksums themselves. The
hash returned must not be modified, it's internal to the object.
$size = $ck->get_size($file)
Return the size of the requested file if it's available in the
object.
$bool = $ck->has_strong_checksums($file)
Return a boolean on whether the file has a strong checksum.
$ck->export_to_string($alg, %opts)
Return a multi-line string containing the checksums of type $alg.
The string can be stored as-is in a Checksum-* field of a
Dpkg::Control object.
$ck->export_to_control($control, %opts)
Export the checksums in the Checksums-* fields of the Dpkg::Control
$control object.
Options:
use_files_for_md5
Set to true to use the Files field instead of Checksums-Md5.
Defaults to false.
CHANGES
Version 1.04 (dpkg 1.20.0)
Remove warning: For obsolete property 'program'.
Version 1.03 (dpkg 1.18.5)
New property: Add new 'strong' property.
New member: $ck->has_strong_checksums().
Version 1.02 (dpkg 1.18.0)
Obsolete property: Getting the 'program' checksum property will warn and
return undef, the Digest module is used internally now.
New property: Add new 'name' property with the name of the Digest
algorithm to use.
Version 1.01 (dpkg 1.17.6)
New argument: Accept an options argument in $ck->export_to_string().
New option: Accept new option 'update' in $ck->add_from_file() and
$ck->add_from_control().
Version 1.00 (dpkg 1.15.6)
Mark the module as public.
1.22.21 2025-06-30 Dpkg::Checksums(3perl)
Generated by dwww version 1.16 on Tue Dec 16 05:49:11 CET 2025.