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Section: libdpkg-perl (3) Updated: 2011-03-01
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Dpkg::Control::Fields - manage (list of official) control fields  


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


my $f = field_capitalize($field_name)
Returns the field name properly capitalized. All characters are lowercase, except the first of each word (words are separated by a dash in field names).
Returns true if the field is official and known.
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.

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_PKG_SRC, CTRL_PKG_DEB or CTRL_FILE_CHANGES, then they are alway 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_PKG_SRC), ``B'' (Binary: corresponds to CTRL_PKG_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_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.

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.
List of fields that contains dependencies-like information in a source Debian package.
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.
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.
field_register($field, $allowed_types, %opts)
Register a new field as being allowed in control information of specified types. %opts is optional
field_insert_after($type, $ref, @fields)
Place field after another one ($ref) in output of control information of type $type.
field_insert_before($type, $ref, @fields)
Place field before another one ($ref) in output of control information of type $type.


Raphaël Hertzog <>.




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Time: 21:45:12 GMT, April 16, 2011