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4984d0f230
Add a script to manage the .hash files in the BR2_GLOBAL_PATCH_DIR for packages using custom versions. To use it, run in a configured Buildroot directory, E.G. make foo_defconfig; ./utils/add-custom-hashes We support multiple patch directories in BR2_GLOBAL_PATCH_DIR. If multiple directories are specified then use the last one as that is likely to be the most specific one. Signed-off-by: Peter Korsgaard <peter@korsgaard.com> [Peter: silence command -v invocation] Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
84 lines
3.3 KiB
Plaintext
84 lines
3.3 KiB
Plaintext
// -*- mode:doc -*- ;
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// vim: set syntax=asciidoc:
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=== Adding project-specific patches and hashes
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[[customize-patches]]
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==== Providing extra patches
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It is sometimes useful to apply 'extra' patches to packages - on top of
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those provided in Buildroot. This might be used to support custom
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features in a project, for example, or when working on a new
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architecture.
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The +BR2_GLOBAL_PATCH_DIR+ configuration option can be used to specify
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a space separated list of one or more directories containing package
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patches.
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For a specific version +<packageversion>+ of a specific package
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+<packagename>+, patches are applied from +BR2_GLOBAL_PATCH_DIR+ as
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follows:
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. For every directory - +<global-patch-dir>+ - that exists in
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+BR2_GLOBAL_PATCH_DIR+, a +<package-patch-dir>+ will be determined as
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follows:
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+
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* +<global-patch-dir>/<packagename>/<packageversion>/+ if the
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directory exists.
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+
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* Otherwise, +<global-patch-dir>/<packagename>+ if the directory
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exists.
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. Patches will then be applied from a +<package-patch-dir>+ as
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follows:
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+
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* If a +series+ file exists in the package directory, then patches are
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applied according to the +series+ file;
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+
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* Otherwise, patch files matching +*.patch+ are applied in
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alphabetical order. So, to ensure they are applied in the right
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order, it is highly recommended to name the patch files like this:
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+<number>-<description>.patch+, where +<number>+ refers to the
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'apply order'.
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For information about how patches are applied for a package, see
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xref:patch-apply-order[]
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The +BR2_GLOBAL_PATCH_DIR+ option is the preferred method for
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specifying a custom patch directory for packages. It can be used to
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specify a patch directory for any package in buildroot. It should also
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be used in place of the custom patch directory options that are
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available for packages such as U-Boot and Barebox. By doing this, it
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will allow a user to manage their patches from one top-level
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directory.
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The exception to +BR2_GLOBAL_PATCH_DIR+ being the preferred method for
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specifying custom patches is +BR2_LINUX_KERNEL_PATCH+.
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+BR2_LINUX_KERNEL_PATCH+ should be used to specify kernel patches that
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are available at a URL. *Note:* +BR2_LINUX_KERNEL_PATCH+ specifies kernel
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patches that are applied after patches available in +BR2_GLOBAL_PATCH_DIR+,
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as it is done from a post-patch hook of the Linux package.
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[[customize-hashes]]
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==== Providing extra hashes
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Buildroot bundles a xref:adding-packages-hash[list of hashes] against
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which it checks the integrity of the downloaded archives, or of those
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it generates locally from VCS checkouts. However, it can only do so
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for the known versions; for packages where it is possible to specify
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a custom version (e.g. a custom version string, a remote tarball URL,
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or a VCS repository location and changeset), Buildroot can't carry
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hashes for those.
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For users concerned with the integrity of such downloads, it is possible
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to provide a list of hashes that Buildroot can use to check arbitrary
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downloaded files. Those extra hashes are looked up similarly to the
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extra patches (above); for each directory in +BR2_GLOBAL_PATCH_DIR+,
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the first file to exist is used to check a package download:
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* +<global-patch-dir>/<packagename>/<packageversion>/<packagename>.hash+
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* +<global-patch-dir>/<packagename>/<packagename>.hash+
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The +utils/add-custom-hashes+ script can be used to generate these files.
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