OpenBSD::PackingElement(3p)

NAME
OpenBSD::PackingElement - "pkg_add(1)" packing-elements object hierarchy

SYNOPSIS
    package OpenBSD::PackingElement;
    sub method
    {
    }

    package OpenBSD::PackingElement::Depend;
    sub method
    {
        my ($self, @args) = @_;
        # do something
    }

    package main;
    use OpenBSD::PackingList;

    $plist = OpenBSD::PackingList->fromfile($filename);
    $plist->visit('method', @args);

DESCRIPTION
"OpenBSD::PackingElement" is the base class for all elements in a packing-list (see OpenBSD::PackingList(3p) and pkg_create(1)).

Manipulation of packing-lists mostly occurs through visitor patterns such as "OpenBSD::PackingList::visit": client code defines a method for each relevant class in the hierarchy and calls "$plist->visit('method')" to perform the processing.

Most actual objects have one property: their "name".

::Meta
    base class for all meta information that can be reordered at will.

    ::Unique
        meta information with uniqueness properties.

        ::Arch
            architecture requirements.

        ::ExtraInfo
            some unique properties, like "PKGPATH" and allowed-for-ftp status.

        ::Name
            the package name.

        ::LocalBase
            the local base for the package.

        ::NoDefaultConflict
            special annotation that package should not have any "stem-*" conflict marker.

        ::SpecialFile
            special files like the package description or install script.

            ::FCONTENTS
                contents file.

            ::FDESC
                package description.

            ::DisplayFile
                abstract class for special files that can be displayed. provides method "prepare($state)" to display the file.

                ::FDISPLAY
                    message displayed during package install.

                ::FUNDISPLAY
                    message displayed during package uninstall.

    ::Option
        factory for @option

    ::Comment
        comments in the packing-lists. The constructor is actually a factory, since some comments evolve to some other class.

    ::CVSTag
        special class of comments that get reordered to the front of packing-lists.

    ::Depend
        all dependency information.

        ::Wantlib
            shared library needed for the package.

        ::Dependency
            package needed, with the following properties: "pkgpath" is the path used to create the dependency, "pattern" is the OpenBSD::PkgSpec(3p) pattern used to match the dependency, "def" is the default value of the dependency computed during build, to use for comparing package signatures and to fullfill default dependencies.

    ::Conflict
        conflict information.

::Annotation
    stuff that doesn't really exist as objects, but is used to add properties to objects.

    ::Ignore
        mark next object as ignored.

    ::sha
        mark last file with a checksum.

    ::size
        mark last file with a size.

    ::symlink
        mark last file as a symlink.

    ::hardlink
        mark last file as a hardlink.

    ::temp
        mark last file with a temporary name. Used during extraction of packages for replacement.

::Object
    somewhat concrete elements in packing-lists. This is the base class for objects with a location in the filesystem. It defineds method "fullname", to access the complete name of the object.

    Note that all objects with file names use relative names except for "::Extra", "::Sample" and "::Sampledir"

    ::FileObject
        abstract class corresponding to files and directories. Default constructor depends on a "dirclass" property, that may create objects from another class if their name ends with a "/". The full object name is normally computed relative to the current working directory as set in "::State".

        ::FileBase
            abstract class for files.

            ::File
                actual file objects present in the packing-list.

            ::InfoFile
                GNU info file objects.

            ::Shell
                files with shell properties.

            ::Manpage
                man pages.

            ::Lib
                shared library files.

            ::Sample
                file objects not present in the packing-list.

        ::DirlikeObject
            abstract class for directories.

            ::DirRm
                deprecated.

            ::DirBase
                ::Dir
                    normal directory, with specialized versions.

                    ::Infodir
                        directory holds GNU info files.

                    ::Fontdir
                        directory holds X11 fonts.

                    ::Mandir
                        directory is the root of a set of manpages.

                    ::Sampledir
                        directory is used to hold configuration files or similar objects.

    ::Action
        stuff that performs some action during addition/removal of package.

        ::NewAuth
            ::NewUser
                user that needs to be created for the package to work.

            ::NewGroup
                group that needs to be created for the package to work.

        ::ExeclikeAction
            escape mechanism for embedded code that needs to be run.

            ::Exec
                code to run during installation.

            ::Unexec
                code to run during deinstallation.

            ::Extraunexec
                extra code to run during deinstallation with -c.

    ::State
        annotation-like stuff that can't be easily moved around because it influences surrounding objects (mostly derived from "::FileObject").

        ::Cwd
            change the current working directory.

        ::Owner
            change the current file owner.

        ::Group
            change the current file group.

        ::Mode
            change the current file mode.

CAVEATS
Some aspects of this API are likely to change in the future, although the basic class hierarchy is now more or less worked out.