Dpkg::Control::FieldsCore(3perl)

NAME
Dpkg::Control::FieldsCore - manage (list of official) control fields

DESCRIPTION
The modules contains a list of field names with associated meta-data explaining in which type of control information they are allowed. The types are the CTRL_* constants exported by Dpkg::Control.

FUNCTIONS

$f = field_capitalize($field_name)
    Returns the field name properly capitalized. All characters are lowercase, except the first of each word (words are separated by a hyphen in field names).

$bool = field_is_official($fname)
    Returns true if the field is official and known.

$bool = field_is_allowed_in($fname, @types)
    Returns true (1) if the field $fname is allowed in all the types listed in the list. Note that you can use type sets instead of individual types (ex: CTRL_FILE_CHANGES | CTRL_CHANGELOG).

    field_allowed_in(A|B, C) returns true only if the field is allowed in C and either A or B.

    Undef is returned for non-official fields.

$new_field = field_transfer_single($from, $to, $field)
    If appropriate, copy the value of the field named $field taken from the $from Dpkg::Control object to the $to Dpkg::Control object.

    Official fields are copied only if the field is allowed in both types of objects. Custom fields are treated in a specific manner. When the target is not among CTRL_DSC, CTRL_DEB or CTRL_FILE_CHANGES, then they are always copied as is (the X- prefix is kept). Otherwise they are not copied except if the target object matches the target destination encoded in the field name. The initial X denoting custom fields can be followed by one or more letters among "S" (Source: corresponds to CTRL_DSC), "B" (Binary: corresponds to CTRL_DEB) or "C" (Changes: corresponds to CTRL_FILE_CHANGES).

    Returns undef if nothing has been copied or the name of the new field added to $to otherwise.

@field_list = field_transfer_all($from, $to)
    Transfer all appropriate fields from $from to $to. Calls field_transfer_single() on all fields available in $from.

    Returns the list of fields that have been added to $to.

@field_list = field_ordered_list($type)
    Returns an ordered list of fields for a given type of control information. This list can be used to output the fields in a predictable order. The list might be empty for types where the order does not matter much.

($source, $version) = field_parse_binary_source($ctrl)
    Parse the Source field in a binary package control stanza. The field contains the source package name where it was built from, and optionally a space and the source version enclosed in parenthesis if it is different from the binary version.

    Returns a list with the $source name, and the source $version, or undef or an empty list when $ctrl does not contain a binary package control stanza. Neither $source nor $version are validated, but that can be done with Dpkg::Package::pkg_name_is_illegal() and Dpkg::Version::version_check().

@field_list = field_list_src_dep()
    List of fields that contains dependencies-like information in a source Debian package.

@field_list = field_list_pkg_dep()
    List of fields that contains dependencies-like information in a binary Debian package. The fields that express real dependencies are sorted from the stronger to the weaker.

$dep_type = field_get_dep_type($field)
    Return the type of the dependency expressed by the given field. Can either be "normal" for a real dependency field (Pre-Depends, Depends, ...) or "union" for other relation fields sharing the same syntax (Conflicts, Breaks, ...). Returns undef for fields which are not dependencies.

$sep_type = field_get_sep_type($field)
    Return the type of the field value separator. Can be one of FIELD_SEP_UNKNOWN, FIELD_SEP_SPACE, FIELD_SEP_COMMA or FIELD_SEP_LINE.

$value = field_get_default_value($field)
    Return the default value (if any) for the field. If there is no default value then it returns "undef".

field_register($field, $allowed_types, %opts)
    Register a new field as being allowed in control information of specified types. %opts is optional.

$bool = field_insert_after($type, $ref, @fields)
    Place field after another one ($ref) in output of control information of type $type.

    Return true if the field was inserted, otherwise false.

$bool = field_insert_before($type, $ref, @fields)
    Place field before another one ($ref) in output of control information of type $type.

    Return true if the field was inserted, otherwise false.

CHANGES

  Version 1.03 (dpkg 1.22.12)
New function: field_get_default_value().

  Version 1.02 (dpkg 1.22.0)
Deprecate argument: field_transfer_single() implicit argument usage.

  Version 1.01 (dpkg 1.21.0)
New function: field_parse_binary_source().

  Version 1.00 (dpkg 1.17.0)
Mark the module as public.