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Alien::Package(3pm)   User Contributed Perl Documentation  Alien::Package(3pm)

       Alien::Package - an object that represents a package

       This is a perl object class that represents a package in an internal
       format usable by alien. The package may be a deb, a rpm, a tgz, or a
       slp package, etc. Objects in this class hold various fields of metadata
       from the actual packages they represent, as well as some fields point-
       ing to the actual contents of the package. They can also examine an
       actual package on disk, and populate those fields. And they can build
       the actual package using the data stored in the fields.

       A typical use of this object class will be to instantiate an object
       from a class derived from this one, such as Alien::Package::Rpm. Feed
       the object a rpm file, thus populating all of its fields. Then rebless
       the object into the destination class, such as Alien::Package::Deb.
       Finally, ask the object to build a package, and the package has been

       These fields are of course really just methods that all act similarly;
       allowing a value to be passed in to set them, or simply returning the
       value of the field if nothing is passed in. Child classes may override
       these fields to process input data, or to format output data. The gen-
       eral rule is that input data is modified to get things into a package-
       independant form, which is how the data is stored in the fields. When
       the value of a field is read, it too may be modified before it is
       returned, to change things into a form more suitable for the particular
       type of package.

           The package's name.

           The package's upstream version.

           The package's distribution specific release number.

           The package's architecture, in the format used by Debian.

           The package's maintainer.

           The package's dependancies. Only dependencies that should exist on
           all target distributions can be put in here though (ie: lsb).

           The section the package is in.

           A one line description of the package.

           A longer description of the package. May contain multiple para-

           A short statement of copyright.

           What format the package was originally in.

           What distribution family the package originated from.

           Whatever the package's package tool says when told to display info
           about the package.

           A reference to a list of all the conffiles in the package.

           A reference to a list of all the files in the package.

           The text of the changelog

           The postinst script of the package.

           The postrm script of the package.

           The preinst script of the package.

           The prerm script of the package.

           Only use the above scripts fields when generating the package if
           this is set to a true value.

           Points to a directory where the package has been unpacked.

           If set this will be a reference to a hash, with filename as key,
           that holds ownership/group information for files that cannot be
           represented on the filesystem. Typically that is because the owners
           or groups just don't exist yet. It will be set at unpack time.

           If set this will be a reference to a hash, with filename as key,
           that holds mode information for setuid files that have an entry in
           owninfo.  It will be set at unpack time.

           This is called by new(). It's a handy place to set fields, etc,
           without having to write your own new() method.

           Simply installs a package file. The filename is passed.  This has
           to be overridden in child classes.

           Test a package file. The filename is passed, should return an array
           of lines of test results. Child classses may implement this.

           Set/get the filename of the package the object represents.

           When it is set, it performs a scan of the file, populating most
           other fields with data from it.

           (This is just a stub; child classes should override it to actually
           do something.)

           Returns a list of all non-empty maintainer scripts in the package.

           This method scans the file associated with an object, and populates
           as many other fields as it can with data from it.

           This method unpacks the package into a temporary directory. It sets
           unpacked_tree to point to that directory.

           (This is just a stub method that makes a directory below the cur-
           rent working directory, and sets unpacked_tree to point to it. It
           should be overridden by child classes to actually unpack the pack-
           age as well.)

           This method causes the object to prepare a build tree to be used in
           building the object. It expects that the unpack method has already
           been called. It takes the tree generated by that method, and man-
           gles it somehow, to produce a suitable build tree.

           (This is just a stub method that all child classes should over-

           This method should clean the unpacked_tree of any effects the prep
           and build methods might have on it.

           This method should ensure that the object is in the same state it
           was in before the prep method was called.

           This method takes a prepped build tree, and simply builds a package
           from it. It should put the package in the current directory, and
           should return the filename of the generated package.

           (This is just a stub method that all child classes should over-

           This method should increment the release field of the package by
           the specified number.

           When an object is destroyed, it cleans some stuff up. In particu-
           lar, if the package was unpacked, it is time now to wipe out the
           temporary directory.

           Handles all fields, by creating accessor methods for them the first
           time they are accessed.

           If set to a nonzero value, the shell commands that are run should
           be output.  If set to a value greater than 1, any output of the
           commands should also be output.

       These methods can be called on either an object or on the class itself.

       new Returns a new object of this class. Optionally, you can pass in
           named parameters that specify the values of any fields in the

           Pass it a filename, and it will return true if it looks like the
           file is a package of the type handled by the class.

       do  Runs a shell command. Is verbose or not depending on the value of
           $Alien::Package::verbose. Returns true if the command succeeds,
           false on failure.

           This is similar to backticks, but honors $Alien::Package::verbose,
           logging the command run if asked to. The output of the command is

           The first parameter controls what to do on error. If it's true then
           any errors from the command will be ignored (and $? will be set).
           If it's false, errors will abort alien.

       Joey Hess <joeyATkitenet.net>

perl v5.8.8                       2008-04-29               Alien::Package(3pm)