summaryrefslogtreecommitdiff
blob: 9e09255fd66fbb7694a60b300d7612359bc0ae30 (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
# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

# @ECLASS: bazel.eclass
# @MAINTAINER:
# Jason Zaman <perfinion@gentoo.org>
# @AUTHOR:
# Jason Zaman <perfinion@gentoo.org>
# @SUPPORTED_EAPIS: 7
# @BLURB: Utility functions for packages using Bazel Build
# @DESCRIPTION:
# A utility eclass providing functions to run the Bazel Build system.
#
# This eclass does not export any phase functions.

case "${EAPI:-0}" in
	0|1|2|3|4|5|6)
		die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}"
		;;
	7)
		;;
	*)
		die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
		;;
esac

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

inherit multiprocessing toolchain-funcs

BDEPEND=">=dev-util/bazel-0.20"

# @FUNCTION: bazel_get_flags
# @DESCRIPTION:
# Obtain and print the bazel flags for target and host *FLAGS.
#
# To add more flags to this, append the flags to the
# appropriate variable before calling this function
bazel_get_flags() {
	local i fs=()
	for i in ${CFLAGS}; do
		fs+=( "--conlyopt=${i}" )
	done
	for i in ${BUILD_CFLAGS}; do
		fs+=( "--host_conlyopt=${i}" )
	done
	for i in ${CXXFLAGS}; do
		fs+=( "--cxxopt=${i}" )
	done
	for i in ${BUILD_CXXFLAGS}; do
		fs+=( "--host_cxxopt=${i}" )
	done
	for i in ${CPPFLAGS}; do
		fs+=( "--conlyopt=${i}" "--cxxopt=${i}" )
	done
	for i in ${BUILD_CPPFLAGS}; do
		fs+=( "--host_conlyopt=${i}" "--host_cxxopt=${i}" )
	done
	for i in ${LDFLAGS}; do
		fs+=( "--linkopt=${i}" )
	done
	for i in ${BUILD_LDFLAGS}; do
		fs+=( "--host_linkopt=${i}" )
	done
	echo "${fs[*]}"
}

# @FUNCTION: bazel_setup_bazelrc
# @DESCRIPTION:
# Creates the bazelrc with common options that will be passed
# to bazel. This will be called by ebazel automatically so
# does not need to be called from the ebuild.
bazel_setup_bazelrc() {
	if [[ -f "${T}/bazelrc" ]]; then
		return
	fi

	# F: fopen_wr
	# P: /proc/self/setgroups
	# Even with standalone enabled, the Bazel sandbox binary is run for feature test:
	# https://github.com/bazelbuild/bazel/blob/7b091c1397a82258e26ab5336df6c8dae1d97384/src/main/java/com/google/devtools/build/lib/sandbox/LinuxSandboxedSpawnRunner.java#L61
	# https://github.com/bazelbuild/bazel/blob/76555482873ffcf1d32fb40106f89231b37f850a/src/main/tools/linux-sandbox-pid1.cc#L113
	addpredict /proc

	mkdir -p "${T}/bazel-cache" || die
	mkdir -p "${T}/bazel-distdir" || die

	cat > "${T}/bazelrc" <<-EOF || die
		startup --batch

		# dont strip HOME, portage sets a temp per-package dir
		build --action_env HOME

		# make bazel respect MAKEOPTS
		build --jobs=$(makeopts_jobs)
		build --compilation_mode=opt --host_compilation_mode=opt

		# FLAGS
		build $(bazel_get_flags)

		# Use standalone strategy to deactivate the bazel sandbox, since it
		# conflicts with FEATURES=sandbox.
		build --spawn_strategy=standalone --genrule_strategy=standalone
		test --spawn_strategy=standalone --genrule_strategy=standalone

		build --strip=never
		build --verbose_failures --noshow_loading_progress
		test --verbose_test_summary --verbose_failures --noshow_loading_progress

		# make bazel only fetch distfiles from the cache
		fetch --repository_cache="${T}/bazel-cache/" --distdir="${T}/bazel-distdir/"
		build --repository_cache="${T}/bazel-cache/" --distdir="${T}/bazel-distdir/"

		build --define=PREFIX=${EPREFIX%/}/usr
		build --define=LIBDIR=\$(PREFIX)/$(get_libdir)
		build --define=INCLUDEDIR=\$(PREFIX)/include
		EOF

	if tc-is-cross-compiler; then
		echo "build --distinct_host_configuration" >> "${T}/bazelrc" || die
	else
		echo "build --nodistinct_host_configuration" >> "${T}/bazelrc" || die
	fi
}

# @FUNCTION: ebazel
# @USAGE: [<args>...]
# @DESCRIPTION:
# Run bazel with the bazelrc and output_base.
#
# output_base will be specific to $BUILD_DIR (if unset, $S).
# bazel_setup_bazelrc will be called and the created bazelrc
# will be passed to bazel.
#
# Will automatically die if bazel does not exit cleanly.
ebazel() {
	bazel_setup_bazelrc

	# Use different build folders for each multibuild variant.
	local output_base="${BUILD_DIR:-${S}}"
	output_base="${output_base%/}-bazel-base"
	mkdir -p "${output_base}" || die

	set -- bazel --bazelrc="${T}/bazelrc" --output_base="${output_base}" ${@}
	echo "${*}" >&2
	"${@}" || die "ebazel failed"
}

# @FUNCTION: bazel_load_distfiles
# @USAGE: <distfiles>...
# @DESCRIPTION:
# Populate the bazel distdir to fetch from since it cannot use
# the network. Bazel looks in distdir but will only look for the
# original filename, not the possibly renamed one that portage
# downloaded. If the line has -> we to rename it back. This also
# handles use-conditionals that SRC_URI does.
#
# Example:
# @CODE
# bazel_external_uris="http://a/file-2.0.tgz
#     python? ( http://b/1.0.tgz -> foo-1.0.tgz )"
# SRC_URI="http://c/${PV}.tgz
#     ${bazel_external_uris}"
#
# src_unpack() {
#     unpack ${PV}.tgz
#     bazel_load_distfiles "${bazel_external_uris}"
# }
# @CODE
bazel_load_distfiles() {
	local file=""
	local rename=0

	[[ "${@}" ]] || die "Missing args"
	mkdir -p "${T}/bazel-distdir" || die

	for word in ${@}
	do
		if [[ "${word}" == "->" ]]; then
			# next word is a dest filename
			rename=1
		elif [[ "${word}" == ")" ]]; then
			# close conditional block
			continue
		elif [[ "${word}" == "(" ]]; then
			# open conditional block
			continue
		elif [[ "${word}" == ?(\!)[A-Za-z0-9]*([A-Za-z0-9+_@-])\? ]]; then
			# use-conditional block
			# USE-flags can contain [A-Za-z0-9+_@-], and start with alphanum
			# https://dev.gentoo.org/~ulm/pms/head/pms.html#x1-200003.1.4
			# ?(\!) matches zero-or-one !'s
			# *(...) zero-or-more characters
			# ends with a ?
			continue
		elif [[ ${rename} -eq 1 ]]; then
			# Make sure the distfile is used
			if [[ "${A}" == *"${word}"* ]]; then
				echo "Copying ${word} to bazel distdir as ${file}"
				ln -s "${DISTDIR}/${word}" "${T}/bazel-distdir/${file}" || die
			fi
			rename=0
			file=""
		else
			# another URL, current one may or may not be a rename
			# if there was a previous one, its not renamed so copy it now
			if [[ -n "${file}" && "${A}" == *"${file}"* ]]; then
				echo "Copying ${file} to bazel distdir"
				ln -s "${DISTDIR}/${file}" "${T}/bazel-distdir/${file}" || die
			fi
			# save the current URL, later we will find out if its a rename or not.
			file="${word##*/}"
		fi
	done

	# handle last file
	if [[ -n "${file}" ]]; then
		echo "Copying ${file} to bazel distdir"
		ln -s "${DISTDIR}/${file}" "${T}/bazel-distdir/${file}" || die
	fi
}

_BAZEL_ECLASS=1
fi