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[packages/trusty/cirros-testvm.git] / cirros-testvm / src-cirros / buildroot-2015.05 / docs / manual / adding-packages-hooks.txt

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+// -*- mode:doc; -*-
+// vim: set syntax=asciidoc:
+
+[[hooks]]
+=== Hooks available in the various build steps
+
+The generic infrastructure (and as a result also the derived autotools
+and cmake infrastructures) allow packages to specify hooks.
+These define further actions to perform after existing steps.
+Most hooks aren't really useful for generic packages, since the +.mk+
+file already has full control over the actions performed in each step
+of the package construction.
+
+The following hook points are available:
+
+* +LIBFOO_PRE_DOWNLOAD_HOOKS+
+* +LIBFOO_POST_DOWNLOAD_HOOKS+
+
+* +LIBFOO_PRE_EXTRACT_HOOKS+
+* +LIBFOO_POST_EXTRACT_HOOKS+
+
+* +LIBFOO_PRE_RSYNC_HOOKS+
+* +LIBFOO_POST_RSYNC_HOOKS+
+
+* +LIBFOO_PRE_PATCH_HOOKS+
+* +LIBFOO_POST_PATCH_HOOKS+
+
+* +LIBFOO_PRE_CONFIGURE_HOOKS+
+* +LIBFOO_POST_CONFIGURE_HOOKS+
+
+* +LIBFOO_PRE_BUILD_HOOKS+
+* +LIBFOO_POST_BUILD_HOOKS+
+
+* +LIBFOO_PRE_INSTALL_HOOKS+ (for host packages only)
+* +LIBFOO_POST_INSTALL_HOOKS+ (for host packages only)
+
+* +LIBFOO_PRE_INSTALL_STAGING_HOOKS+ (for target packages only)
+* +LIBFOO_POST_INSTALL_STAGING_HOOKS+ (for target packages only)
+
+* +LIBFOO_PRE_INSTALL_TARGET_HOOKS+ (for target packages only)
+* +LIBFOO_POST_INSTALL_TARGET_HOOKS+ (for target packages only)
+
+* +LIBFOO_PRE_INSTALL_IMAGES_HOOKS+
+* +LIBFOO_POST_INSTALL_IMAGES_HOOKS+
+
+* +LIBFOO_PRE_LEGAL_INFO_HOOKS+
+* +LIBFOO_POST_LEGAL_INFO_HOOKS+
+
+These variables are 'lists' of variable names containing actions to be
+performed at this hook point. This allows several hooks to be
+registered at a given hook point. Here is an example:
+
+----------------------
+define LIBFOO_POST_PATCH_FIXUP
+       action1
+       action2
+endef
+
+LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
+----------------------
+
+==== Using the +POST_RSYNC+ hook
+The +POST_RSYNC+ hook is run only for packages that use a local source,
+either through the +local+ site method or the +OVERRIDE_SRCDIR+
+mechanism. In this case, package sources are copied using +rsync+ from
+the local location into the buildroot build directory. The +rsync+
+command does not copy all files from the source directory, though.
+Files belonging to a version control system, like the directories
++.git+, +.hg+, etc. are not copied. For most packages this is
+sufficient, but a given package can perform additional actions using
+the +POST_RSYNC+ hook.
+
+In principle, the hook can contain any command you want. One specific
+use case, though, is the intentional copying of the version control
+directory using +rsync+. The +rsync+ command you use in the hook can, among
+others, use the following variables:
+
+* +$(SRCDIR)+: the path to the overridden source directory
+* +$(@D)+: the path to the build directory