// -*- mode:doc; -*- // vim: set syntax=asciidoc: === Tips and tricks [[package-name-variable-relation]] ==== Package name, config entry name and makefile variable relationship In Buildroot, there is some relationship between: * the _package name_, which is the package directory name (and the name of the +*.mk+ file); * the config entry name that is declared in the +Config.in+ file; * the makefile variable prefix. It is mandatory to maintain consistency between these elements, using the following rules: * the package directory and the +*.mk+ name are the _package name_ itself (e.g.: +package/foo-bar_boo/foo-bar_boo.mk+); * the _make_ target name is the _package name_ itself (e.g.: +foo-bar_boo+); * the config entry is the upper case _package name_ with `.` and `-` characters substituted with `_`, prefixed with +BR2_PACKAGE_+ (e.g.: +BR2_PACKAGE_FOO_BAR_BOO+); * the +*.mk+ file variable prefix is the upper case _package name_ with `.` and `-` characters substituted with `_` (e.g.: +FOO_BAR_BOO_VERSION+). [[github-download-url]] ==== How to add a package from GitHub Packages on GitHub often don't have a download area with release tarballs. However, it is possible to download tarballs directly from the repository on GitHub. As GitHub is known to have changed download mechanisms in the past, the 'github' helper function should be used as shown below. ------------------------ # Use a tag or a full commit ID FOO_VERSION = v1.0 FOO_SITE = $(call github,,,$(FOO_VERSION)) ------------------------ .Notes - The FOO_VERSION can either be a tag or a commit ID. - The tarball name generated by github matches the default one from Buildroot (e.g.: +foo-f6fb6654af62045239caed5950bc6c7971965e60.tar.gz+), so it is not necessary to specify it in the +.mk+ file. - When using a commit ID as version, you should use the full 40 hex characters. If the package you wish to add does have a release section on GitHub, the maintainer may have uploaded a release tarball, or the release may just point to the automatically generated tarball from the git tag. If there is a release tarball uploaded by the maintainer, we prefer to use that since it may be slightly different (e.g. it contains a configure script so we don't need to do AUTORECONF). You can see on the release page if it's an uploaded tarball or a git tag: - If there is a green download button, like https://github.com/zedshaw/mongrel2/releases/tag/v1.9.1[mongrel2], then it was uploaded by the maintainer and you should use the link of that button to specify +FOO_SITE+, and not use the 'github' helper. - If there is grey download button, like https://github.com/xbmc/xbmc/releases/tag/13.2-Gotham[xbmc], then it's an automatically generated tarball and you should use the 'github' helper function.