1Dpkg::Control::FieldsCore(3perl) libdpkg-perl Dpkg::Control::FieldsCore(3perl)
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NAME

6       Dpkg::Control::FieldsCore - manage (list of official) control fields
7

DESCRIPTION

9       The modules contains a list of fieldnames with associated meta-data
10       explaining in which type of control information they are allowed. The
11       types are the CTRL_* constants exported by Dpkg::Control.
12

FUNCTIONS

14       $f = field_capitalize($field_name)
15           Returns the field name properly capitalized. All characters are
16           lowercase, except the first of each word (words are separated by a
17           hyphen in field names).
18
19       $bool = field_is_official($fname)
20           Returns true if the field is official and known.
21
22       $bool = field_is_allowed_in($fname, @types)
23           Returns true (1) if the field $fname is allowed in all the types
24           listed in the list. Note that you can use type sets instead of
25           individual types (ex: CTRL_FILE_CHANGES | CTRL_CHANGELOG).
26
27           field_allowed_in(A|B, C) returns true only if the field is allowed
28           in C and either A or B.
29
30           Undef is returned for non-official fields.
31
32       $new_field = field_transfer_single($from, $to, $field)
33           If appropriate, copy the value of the field named $field taken from
34           the $from Dpkg::Control object to the $to Dpkg::Control object.
35
36           Official fields are copied only if the field is allowed in both
37           types of objects. Custom fields are treated in a specific manner.
38           When the target is not among CTRL_PKG_SRC, CTRL_PKG_DEB or
39           CTRL_FILE_CHANGES, then they are always copied as is (the X- prefix
40           is kept). Otherwise they are not copied except if the target object
41           matches the target destination encoded in the field name. The
42           initial X denoting custom fields can be followed by one or more
43           letters among "S" (Source: corresponds to CTRL_PKG_SRC), "B"
44           (Binary: corresponds to CTRL_PKG_DEB) or "C" (Changes: corresponds
45           to CTRL_FILE_CHANGES).
46
47           Returns undef if nothing has been copied or the name of the new
48           field added to $to otherwise.
49
50       @field_list = field_transfer_all($from, $to)
51           Transfer all appropriate fields from $from to $to. Calls
52           field_transfer_single() on all fields available in $from.
53
54           Returns the list of fields that have been added to $to.
55
56       @field_list = field_ordered_list($type)
57           Returns an ordered list of fields for a given type of control
58           information.  This list can be used to output the fields in a
59           predictable order.  The list might be empty for types where the
60           order does not matter much.
61
62       ($source, $version) = field_parse_binary_source($ctrl)
63           Parse the Source field in a binary package control stanza. The
64           field contains the source package name where it was built from, and
65           optionally a space and the source version enclosed in parenthesis
66           if it is different from the binary version.
67
68           Returns a list with the $source name, and the source $version, or
69           undef or an empty list when $ctrl does not contain a binary package
70           control stanza.  Neither $source nor $version are validated, but
71           that can be done with Dpkg::Package::pkg_name_is_illegal() and
72           Dpkg::Version::version_check().
73
74       @field_list = field_list_src_dep()
75           List of fields that contains dependencies-like information in a
76           source Debian package.
77
78       @field_list = field_list_pkg_dep()
79           List of fields that contains dependencies-like information in a
80           binary Debian package. The fields that express real dependencies
81           are sorted from the stronger to the weaker.
82
83       $dep_type = field_get_dep_type($field)
84           Return the type of the dependency expressed by the given field. Can
85           either be "normal" for a real dependency field (Pre-Depends,
86           Depends, ...)  or "union" for other relation fields sharing the
87           same syntax (Conflicts, Breaks, ...). Returns undef for fields
88           which are not dependencies.
89
90       $sep_type = field_get_sep_type($field)
91           Return the type of the field value separator. Can be one of
92           FIELD_SEP_UNKNOWN, FIELD_SEP_SPACE, FIELD_SEP_COMMA or
93           FIELD_SEP_LINE.
94
95       field_register($field, $allowed_types, %opts)
96           Register a new field as being allowed in control information of
97           specified types. %opts is optional.
98
99       $bool = field_insert_after($type, $ref, @fields)
100           Place field after another one ($ref) in output of control
101           information of type $type.
102
103           Return true if the field was inserted, otherwise false.
104
105       $bool = field_insert_before($type, $ref, @fields)
106           Place field before another one ($ref) in output of control
107           information of type $type.
108
109           Return true if the field was inserted, otherwise false.
110

CHANGES

112   Version 1.01 (dpkg 1.21.0)
113       New function: field_parse_binary_source().
114
115   Version 1.00 (dpkg 1.17.0)
116       Mark the module as public.
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1201.21.21                           2023-07-19  Dpkg::Control::FieldsCore(3perl)
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