7.13. Packaging - package*.bbclass

-7.13. Packaging - `package*.bbclass` -

- The packaging classes add support for generating packages from a build's - output. - The core generic functionality is in package.bbclass. - The code specific to particular package types is contained in various sub-classes such as - package_deb.bbclass, package_ipk.bbclass, - and package_rpm.bbclass. - Most users will want one or more of these classes. -

- You can control the list of resulting package formats by using the - PACKAGE_CLASSES - variable defined in the local.conf configuration file, - which is located in the conf folder of the - Source Directory. - When defining the variable, you can specify one or more package types. - Since images are generated from packages, a packaging class is - needed to enable image generation. - The first class listed in this variable is used for image generation. -

- The package class you choose can affect build-time performance and has space - ramifications. - In general, building a package with RPM takes about thirty percent more time as - compared to using IPK to build the same or similar package. - This comparison takes into account a complete build of the package with all - dependencies previously built. - The reason for this discrepancy is because the RPM package manager creates and - processes more metadata than the IPK package manager. - Consequently, you might consider setting PACKAGE_CLASSES - to "package_ipk" if you are building smaller systems. -

- Keep in mind, however, that RPM starts to provide more abilities than IPK due to - the fact that it processes more metadata. - For example, this information includes individual file types, file checksum generation - and evaluation on install, sparse file support, conflict detection and resolution - for multilib systems, ACID style upgrade, and repackaging abilities for rollbacks. -

- Another consideration for packages built using the RPM package manager is space. - For smaller systems, the extra space used for the Berkley Database and the amount - of metadata can affect your ability to do on-device upgrades. -

- You can find additional information on the effects of the package class at these - two Yocto Project mailing list links: -

-7.13. Packaging - package*.bbclass -

-7.13. Packaging - `package*.bbclass` -