summaryrefslogtreecommitdiff
blob: 0a2771e66326fc3b928425b89ef616e4fcf17bfc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
# Copyright 1999-2013 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/multibuild.eclass,v 1.14 2013/09/18 08:49:33 mgorny Exp $

# @ECLASS: multibuild
# @MAINTAINER:
# Michał Górny <mgorny@gentoo.org>
# @AUTHOR:
# Author: Michał Górny <mgorny@gentoo.org>
# @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 ${ECLASS}"
		;;
	4|5)
		;;
	*)
		die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
		;;
esac

if [[ ! ${_MULTIBUILD} ]]; then

inherit multiprocessing

DEPEND="userland_GNU? ( >=sys-apps/coreutils-8.5 )"

# @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 alike multibuild_foreach_variant. Multiple invocations of the command
# will be performed in parallel, up to MULTIBUILD_JOBS tasks.
#
# 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 ${FUNCNAME} "${@}"

	local ret lret

	_multibuild_parallel() {
		(
			multijob_child_init
			"${@}"
		) &
		multijob_post_fork
	}

	local opts
	if [[ ${MULTIBUILD_JOBS} ]]; then
		opts=-j${MULTIBUILD_JOBS}
	else
		opts=${MAKEOPTS}
	fi

	multijob_init "${opts}"
	multibuild_foreach_variant _multibuild_parallel "${@}"
	ret=${?}
	multijob_finish
	lret=${?}

	[[ ${ret} -eq 0 ]] && ret=${lret}
	return ${ret}
}

# @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}"

	_multibuild_create_source_copy() {
		einfo "${MULTIBUILD_VARIANT}: copying to ${BUILD_DIR}"
		cp -pr "${_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."

	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 ${D}). Source root will be removed.
#
# This functions uses locking to support merging during parallel
# installs.
multibuild_merge_root() {
	local src=${1}
	local dest=${2}

	local lockfile=${T}/.multibuild_merge_lock
	local lockfile_l=${lockfile}.${BASHPID}
	local ret

	# Lock the install tree for merge. The touch+ln method ensures race
	# condition-free locking with maximum portability.
	touch "${lockfile_l}" || die
	until ln "${lockfile_l}" "${lockfile}" &>/dev/null; do
		sleep 1
	done
	rm "${lockfile_l}" || die

	if use userland_BSD; then
		# 'cp -a -n' is broken:
		# http://www.freebsd.org/cgi/query-pr.cgi?pr=174489
		# using tar instead which is universal but terribly slow.

		tar -C "${src}" -f - -c . \
			| tar -x -f - -C "${dest}"
		[[ ${PIPESTATUS[*]} == '0 0' ]]
		ret=${?}
	elif use userland_GNU; then
		# cp works with '-a -n'.

		cp -a -l -n "${src}"/. "${dest}"/
		ret=${?}
	else
		die "Unsupported userland (${USERLAND}), please report."
	fi

	# Remove the lock.
	rm "${lockfile}" || die

	if [[ ${ret} -ne 0 ]]; then
		die "${MULTIBUILD_VARIANT:-(unknown)}: merging image failed."
	fi

	rm -rf "${src}"
}

_MULTIBUILD=1
fi