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# Copyright 1999-2018 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: multibuild.eclass
# @MAINTAINER:
# Michał Górny <mgorny@gentoo.org>
# @AUTHOR:
# Author: Michał Górny <mgorny@gentoo.org>
# @SUPPORTED_EAPIS: 4 5 6 7
# @BLURB: A generic eclass for building multiple variants of packages.
# @DESCRIPTION:
# The multibuild eclass aims to provide a generic framework for building
# multiple 'variants' of a package (e.g. multilib, Python
# implementations).
case "${EAPI:-0}" in
0|1|2|3)
die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}"
;;
4|5|6|7)
;;
*)
die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
;;
esac
if [[ ! ${_MULTIBUILD} ]]; then
# @ECLASS-VARIABLE: MULTIBUILD_VARIANTS
# @DESCRIPTION:
# An array specifying all enabled variants which multibuild_foreach*
# can execute the process for.
#
# In ebuild, it can be set in global scope. Eclasses should set it
# locally in function scope to support nesting properly.
#
# Example:
# @CODE
# python_foreach_impl() {
# local MULTIBUILD_VARIANTS=( python{2_5,2_6,2_7} ... )
# multibuild_foreach_variant python_compile
# }
# @CODE
# @ECLASS-VARIABLE: MULTIBUILD_VARIANT
# @DESCRIPTION:
# The current variant which the function was executed for.
#
# Example value:
# @CODE
# python2_6
# @CODE
# @ECLASS-VARIABLE: MULTIBUILD_ID
# @DESCRIPTION:
# The unique identifier for a multibuild run. In a simple run, it is
# equal to MULTIBUILD_VARIANT. In a nested multibuild environment, it
# contains the complete selection tree.
#
# It can be used to create variant-unique directories and files.
#
# Example value:
# @CODE
# amd64-double
# @CODE
# @ECLASS-VARIABLE: BUILD_DIR
# @DESCRIPTION:
# The current build directory. In global scope, it is supposed
# to contain an 'initial' build directory. If unset, ${S} is used.
#
# multibuild_foreach_variant() sets BUILD_DIR locally
# to variant-specific build directories based on the initial value
# of BUILD_DIR.
#
# Example value:
# @CODE
# ${WORKDIR}/foo-1.3-python2_6
# @CODE
# @FUNCTION: multibuild_foreach_variant
# @USAGE: [<argv>...]
# @DESCRIPTION:
# Run the passed command repeatedly for each of the enabled package
# variants.
#
# Each of the runs will have variant-specific BUILD_DIR set, and output
# teed to a separate log in ${T}.
#
# The function returns 0 if all commands return 0, or the first non-zero
# exit status otherwise. However, it performs all the invocations
# nevertheless. It is preferred to call 'die' inside of the passed
# function.
multibuild_foreach_variant() {
debug-print-function ${FUNCNAME} "${@}"
[[ ${MULTIBUILD_VARIANTS} ]] \
|| die "MULTIBUILD_VARIANTS need to be set"
local bdir=${BUILD_DIR:-${S}}
# Avoid writing outside WORKDIR if S=${WORKDIR}.
[[ ${bdir%%/} == ${WORKDIR%%/} ]] && bdir=${WORKDIR}/build
local prev_id=${MULTIBUILD_ID:+${MULTIBUILD_ID}-}
local ret=0 lret=0 v
debug-print "${FUNCNAME}: initial build_dir = ${bdir}"
for v in "${MULTIBUILD_VARIANTS[@]}"; do
local MULTIBUILD_VARIANT=${v}
local MULTIBUILD_ID=${prev_id}${v}
local BUILD_DIR=${bdir%%/}-${v}
_multibuild_run() {
# find the first non-private command
local i=1
while [[ ${!i} == _* ]]; do
(( i += 1 ))
done
[[ ${i} -le ${#} ]] && einfo "${v}: running ${@:${i}}"
"${@}"
}
_multibuild_run "${@}" \
> >(exec tee -a "${T}/build-${MULTIBUILD_ID}.log") 2>&1
lret=${?}
done
[[ ${ret} -eq 0 && ${lret} -ne 0 ]] && ret=${lret}
return ${ret}
}
# @FUNCTION: multibuild_parallel_foreach_variant
# @USAGE: [<argv>...]
# @DESCRIPTION:
# Run the passed command repeatedly for each of the enabled package
# variants. This used to run the commands in parallel but now it's
# just a deprecated alias to multibuild_foreach_variant.
#
# The function returns 0 if all commands return 0, or the first non-zero
# exit status otherwise. However, it performs all the invocations
# nevertheless. It is preferred to call 'die' inside of the passed
# function.
multibuild_parallel_foreach_variant() {
debug-print-function ${FUNCNAME} "${@}"
[[ ${EAPI} == [45] ]] || die "${FUNCNAME} is banned in EAPI ${EAPI}"
multibuild_foreach_variant "${@}"
}
# @FUNCTION: multibuild_for_best_variant
# @USAGE: [<argv>...]
# @DESCRIPTION:
# Run the passed command once, for the best of the enabled package
# variants.
#
# The run will have a proper, variant-specificBUILD_DIR set, and output
# teed to a separate log in ${T}.
#
# The function returns command exit status.
multibuild_for_best_variant() {
debug-print-function ${FUNCNAME} "${@}"
[[ ${MULTIBUILD_VARIANTS} ]] \
|| die "MULTIBUILD_VARIANTS need to be set"
# bash-4.1 can't handle negative subscripts
local MULTIBUILD_VARIANTS=(
"${MULTIBUILD_VARIANTS[$(( ${#MULTIBUILD_VARIANTS[@]} - 1 ))]}"
)
multibuild_foreach_variant "${@}"
}
# @FUNCTION: multibuild_copy_sources
# @DESCRIPTION:
# Create per-variant copies of source tree. The source tree is assumed
# to be in ${BUILD_DIR}, or ${S} if the former is unset. The copies will
# be placed in directories matching BUILD_DIRs used by
# multibuild_foreach().
multibuild_copy_sources() {
debug-print-function ${FUNCNAME} "${@}"
local _MULTIBUILD_INITIAL_BUILD_DIR=${BUILD_DIR:-${S}}
einfo "Will copy sources from ${_MULTIBUILD_INITIAL_BUILD_DIR}"
local cp_args=()
if cp --reflink=auto --version &>/dev/null; then
# enable reflinking if possible to make this faster
cp_args+=( --reflink=auto )
fi
_multibuild_create_source_copy() {
einfo "${MULTIBUILD_VARIANT}: copying to ${BUILD_DIR}"
cp -p -R "${cp_args[@]}" \
"${_MULTIBUILD_INITIAL_BUILD_DIR}" "${BUILD_DIR}" || die
}
multibuild_foreach_variant _multibuild_create_source_copy
}
# @FUNCTION: run_in_build_dir
# @USAGE: <argv>...
# @DESCRIPTION:
# Run the given command in the directory pointed by BUILD_DIR.
run_in_build_dir() {
debug-print-function ${FUNCNAME} "${@}"
local ret
[[ ${#} -ne 0 ]] || die "${FUNCNAME}: no command specified."
[[ ${BUILD_DIR} ]] || die "${FUNCNAME}: BUILD_DIR not set."
mkdir -p "${BUILD_DIR}" || die
pushd "${BUILD_DIR}" >/dev/null || die
"${@}"
ret=${?}
popd >/dev/null || die
return ${ret}
}
# @FUNCTION: multibuild_merge_root
# @USAGE: <src-root> <dest-root>
# @DESCRIPTION:
# Merge the directory tree (fake root) from <src-root> to <dest-root>
# (the real root). Both directories have to be real, absolute paths
# (i.e. including ${D}). Source root will be removed.
multibuild_merge_root() {
local src=${1}
local dest=${2}
local ret
if use userland_BSD; then
# Most of BSD variants fail to copy broken symlinks, #447370
# also, they do not support --version
tar -C "${src}" -f - -c . \
| tar -x -f - -C "${dest}"
[[ ${PIPESTATUS[*]} == '0 0' ]]
ret=${?}
else
local cp_args=()
if cp -a --version &>/dev/null; then
cp_args+=( -a )
else
cp_args+=( -P -R -p )
fi
if cp --reflink=auto --version &>/dev/null; then
# enable reflinking if possible to make this faster
cp_args+=( --reflink=auto )
fi
cp "${cp_args[@]}" "${src}"/. "${dest}"/
ret=${?}
fi
if [[ ${ret} -ne 0 ]]; then
die "${MULTIBUILD_VARIANT:-(unknown)}: merging image failed."
fi
rm -rf "${src}"
}
_MULTIBUILD=1
fi