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core: add support for multiple br2-external trees
Currently, we only support at most one br2-external tree. Being able
to use more than one br2-external tree can be very useful.
A use-case would be for having a br2-external to contain the basic
packages, basic board defconfigs and board files, provided by one team
responsible for the "board-bringup", while other teams consume that
br2-external as a base, and complements it each with their own set of
packages, defconfigs and extra board files.
Another use-case would be for third-parties to provide their own
Buildroot packaging in a br2-external tree, along-side the archives for
their stuff.
Finally, another use-case is to be able to add FLOSS packages in a
br2-external tree, and proprietary packages in another. This allows
to not touch the Buildroot tree at all, and still be able to get in
compliance by providing only that br2-external tree(s) that contains
FLOSS packages, leaving aside the br2-external tree(s) with the
proprietary bits.
What we do is to treat BR2_EXTERNAL as a colon-separated (space-
separated also work, and we use that internally) list of paths, on which
we iterate to construct:
- the list of all br2-external names, BR2_EXTERNAL_NAMES,
- the per-br2-external tree BR2_EXTERNAL_$(NAME) variables, which
point each to the actual location of the corresponding tree,
- the list of paths to all the external.mk files, BR2_EXTERNAL_MKS,
- the space-separated list of absolute paths to the external trees,
BR2_EXTERNAL_DIRS.
Once we have all those variables, we replace references to BR2_EXTERNAL
with either one of those.
This cascades into how we display the list of defconfigs, so that it is
easy to see what br2-external tree provides what defconfigs. As
suggested by Arnout, tweak the comment from "User-provided configs" to
"External configs", on the assumption that some br2-external trees could
be provided by vendors, so not necessarily user-provided. Ditto the menu
in Kconfig, changed from "User-provided options" to "External options".
Now, when more than one br2-external tree is used, each gets its own
sub-menu in the "User-provided options" menu. The sub-menu is labelled
with that br2-external tree's name and the sub-menu's first item is a
comment with the path to that br2-external tree.
If there's only one br2-external tree, then there is no sub-menu; there
is a single comment that contains the name and path to the br2-external
tree.
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Romain Naour <romain.naour@openwide.fr>
Cc: Julien CORJON <corjon.j@ecagroup.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Yann E. MORIN
committed by
Peter Korsgaard
Peter Korsgaard
parent
a71e311df6
commit
20cd497387
@@ -1,9 +1,9 @@
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#!/bin/bash
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set -e
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# The name and location of the br2-external tree, once validated.
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declare BR2_NAME
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declare BR2_EXT
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# The names and locations of the br2-external trees, once validated.
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declare -a BR2_EXT_NAMES
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declare -A BR2_EXT_PATHS
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# URL to manual for help in converting old br2-external trees.
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# Escape '#' so that make does not consider it a comment.
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@@ -26,13 +26,6 @@ main() {
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# Forget options; keep only positional args
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shift $((OPTIND-1))
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# Accept 0 or 1 br2-external tree.
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if [ ${#} -gt 1 ]; then
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error "only zero or one br2-external tree allowed.\n"
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fi
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br2_ext="${1}"
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case "${ofmt}" in
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mk|kconfig)
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;;
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@@ -44,13 +37,14 @@ main() {
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exec >"${ofile}"
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do_validate "${br2_ext}"
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do_validate ${@//:/ }
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do_${ofmt}
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}
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# Validates the br2-external tree passed as argument. Makes it cannonical
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# and store it in global variable BR2_EXT.
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# Validates the br2-external trees passed as arguments. Makes each of
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# them canonical and store them in the global arrays BR2_EXT_NAMES
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# and BR2_EXT_PATHS.
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#
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# Note: since this script is always first called from Makefile context
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# to generate the Makefile fragment before it is called to generate the
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@@ -59,14 +53,22 @@ main() {
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# snippet means that there were no error.
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#
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do_validate() {
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local br2_ext="${1}"
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local br2_name n
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local br2_ext
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# No br2-external tree is valid
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if [ -z "${br2_ext}" ]; then
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if [ ${#} -eq 0 ]; then
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# No br2-external tree is valid
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return
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fi
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for br2_ext in "${@}"; do
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do_validate_one "${br2_ext}"
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done
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}
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do_validate_one() {
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local br2_ext="${1}"
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local br2_name n
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if [ ! -d "${br2_ext}" ]; then
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error "'%s': no such file or directory\n" "${br2_ext}"
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fi
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@@ -88,6 +90,10 @@ do_validate() {
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error "'%s': name '%s' contains invalid chars: '%s'\n" \
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"${br2_ext}" "${br2_name//\$/\$\$}" "${n//\$/\$\$}"
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fi
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if [ -n "${BR2_EXT_PATHS["${br2_name}"]}" ]; then
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error "'%s': name '%s' is already used in '%s'\n" \
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"${br2_ext}" "${br2_name}" "${BR2_EXT_PATHS["${br2_name}"]}"
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fi
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if [ ! -f "${br2_ext}/external.mk" ]; then
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error "'%s/external.mk': no such file or directory\n" "${br2_ext}"
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fi
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@@ -95,51 +101,80 @@ do_validate() {
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error "'%s/Config.in': no such file or directory\n" "${br2_ext}"
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fi
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BR2_NAME="${br2_name}"
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BR2_EXT="$(cd "${br2_ext}"; pwd -P )"
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# Register this br2-external tree
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BR2_EXT_NAMES+=( "${br2_name}" )
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BR2_EXT_PATHS["${br2_name}"]="${br2_ext}"
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}
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# Generate the .mk snippet that defines makefile variables
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# for the br2-external tree
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do_mk() {
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local br2_name br2_ext
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printf '#\n# Automatically generated file; DO NOT EDIT.\n#\n'
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printf '\n'
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printf 'BR2_EXTERNAL ?= %s\n' "${BR2_EXT}"
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printf 'BR2_EXTERNAL_NAME = \n'
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printf 'BR2_EXTERNAL_MK =\n'
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# We can't use ${BR2_EXT_NAMES[@]} directly: it is not guaranteed
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# to be in the order paths were added (because it is an associative
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# array). So we need to iterate on BR2_EXT_NAMES, which is sorted
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# in the order names were added (because it is an indexed array).
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printf 'BR2_EXTERNAL ?='
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for br2_name in "${BR2_EXT_NAMES[@]}"; do
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printf ' %s' "${BR2_EXT_PATHS["${br2_name}"]}"
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done
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printf '\n'
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if [ -z "${BR2_NAME}" ]; then
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printf 'BR2_EXTERNAL_NAMES = \n'
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printf 'BR2_EXTERNAL_DIRS = \n'
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printf 'BR2_EXTERNAL_MKS = \n'
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if [ ${#BR2_EXT_NAMES[@]} -eq 0 ]; then
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printf '\n'
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printf '# No br2-external tree defined.\n'
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return
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fi
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printf 'BR2_EXTERNAL_NAME = %s\n' "${BR2_NAME}"
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printf 'BR2_EXTERNAL_MK = %s/external.mk\n' "${BR2_EXT}"
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printf 'BR2_EXTERNAL_%s_PATH = %s\n' "${BR2_NAME}" "${BR2_EXT}"
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for br2_name in "${BR2_EXT_NAMES[@]}"; do
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br2_ext="${BR2_EXT_PATHS["${br2_name}"]}"
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printf '\n'
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printf 'BR2_EXTERNAL_NAMES += %s\n' "${br2_name}"
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printf 'BR2_EXTERNAL_%s_PATH = %s\n' "${br2_name}" "${br2_ext}"
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printf 'BR2_EXTERNAL_DIRS += %s\n' "${br2_ext}"
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printf 'BR2_EXTERNAL_MKS += %s/external.mk\n' "${br2_ext}"
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done
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}
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# Generate the kconfig snippet for the br2-external tree.
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do_kconfig() {
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local br2_name br2_ext
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printf '#\n# Automatically generated file; DO NOT EDIT.\n#\n'
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printf '\n'
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if [ -z "${BR2_NAME}" ]; then
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if [ ${#BR2_EXT_NAMES[@]} -eq 0 ]; then
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printf '# No br2-external tree defined.\n'
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return
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fi
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printf 'menu "User-provided options"\n'
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printf '\n'
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printf 'comment "%s (in %s)"\n' "${BR2_NAME}" "${BR2_EXT}"
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printf '\n'
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printf 'config BR2_EXTERNAL_%s_PATH\n' "${BR2_NAME}"
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printf '\tstring\n'
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printf '\tdefault "%s"\n' "${BR2_EXT}"
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printf '\n'
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printf 'source "$BR2_EXTERNAL_%s_PATH/Config.in"\n' "${BR2_NAME}"
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printf 'menu "External options"\n'
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printf '\n'
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for br2_name in "${BR2_EXT_NAMES[@]}"; do
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br2_ext="${BR2_EXT_PATHS["${br2_name}"]}"
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if [ ${#BR2_EXT_NAMES[@]} -gt 1 ]; then
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printf 'menu "%s"\n' "${br2_name}"
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fi
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printf 'comment "%s (in %s)"\n' "${br2_name}" "${br2_ext}"
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printf 'config BR2_EXTERNAL_%s_PATH\n' "${br2_name}"
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printf '\tstring\n'
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printf '\tdefault "%s"\n' "${br2_ext}"
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printf 'source "%s/Config.in"\n' "${br2_ext}"
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if [ ${#BR2_EXT_NAMES[@]} -gt 1 ]; then
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printf 'endmenu # %s\n' "${br2_name}"
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fi
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printf '\n'
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done
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printf "endmenu # User-provided options\n"
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}
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@@ -149,12 +184,12 @@ help() {
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${my_name} <-m|-k> -o FILE PATH
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With -m, ${my_name} generates the makefile fragment that defines
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variables related to the br2-external tree passed as positional
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argument.
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variables related to the br2-external trees passed as positional
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arguments.
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With -k, ${my_name} generates the kconfig snippet to include the
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configuration options specified in the br2-external tree passed
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as positional argument.
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configuration options specified in the br2-external trees passed
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as positional arguments.
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Using -k and -m together is not possible. The last one wins.
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