Implement a repository rule for importing system libraries

This commit is contained in:
Andrzej Głuszak 2020-09-21 17:47:08 +00:00
parent 02becfef8b
commit 6c1dbe079d
4 changed files with 1288 additions and 0 deletions

312
cc/system_library.bzl Normal file
View File

@ -0,0 +1,312 @@
BAZEL_LIB_ADDITIONAL_PATHS_ENV_VAR = "BAZEL_LIB_ADDITIONAL_PATHS"
BAZEL_LIB_OVERRIDE_PATHS_ENV_VAR = "BAZEL_LIB_OVERRIDE_PATHS"
BAZEL_INCLUDE_ADDITIONAL_PATHS_ENV_VAR = "BAZEL_INCLUDE_ADDITIONAL_PATHS"
BAZEL_INCLUDE_OVERRIDE_PATHS_ENV_VAR = "BAZEL_INCLUDE_OVERRIDE_PATHS"
ENV_VAR_SEPARATOR = ","
ENV_VAR_ASSIGNMENT = "="
def _make_flags(array_of_strings, prefix):
flags = []
if array_of_strings:
for s in array_of_strings:
flags.append(prefix + s)
return " ".join(flags)
def _split_env_var(repo_ctx, var_name):
value = repo_ctx.os.environ.get(var_name)
if value:
assignments = value.split(ENV_VAR_SEPARATOR)
dict = {}
for assignment in assignments:
pair = assignment.split(ENV_VAR_ASSIGNMENT)
if len(pair) != 2:
fail(
"Assignments should have form 'name=value', but encountered {} in env variable {}"
.format(assignment, var_name),
)
key, value = pair[0], pair[1]
if not dict.get(key):
dict[key] = []
dict[key].append(value)
return dict
else:
return {}
def _get_list_from_env_var(repo_ctx, var_name, key):
return _split_env_var(repo_ctx, var_name).get(key, default = [])
def _execute_bash(repo_ctx, cmd):
return repo_ctx.execute(["/bin/bash", "-c", cmd]).stdout.replace("\n", "")
def _find_linker(repo_ctx):
ld = _execute_bash(repo_ctx, "which ld")
lld = _execute_bash(repo_ctx, "which lld")
if ld:
return ld
elif lld:
return lld
else:
fail("No linker found")
def _find_compiler(repo_ctx):
gcc = _execute_bash(repo_ctx, "which g++")
clang = _execute_bash(repo_ctx, "which clang++")
if gcc:
return gcc
elif clang:
return clang
else:
fail("No compiler found")
def _find_lib_path(repo_ctx, lib_name, archive_names, lib_path_hints):
override_paths = _get_list_from_env_var(repo_ctx, BAZEL_LIB_OVERRIDE_PATHS_ENV_VAR, lib_name)
additional_paths = _get_list_from_env_var(repo_ctx, BAZEL_LIB_ADDITIONAL_PATHS_ENV_VAR, lib_name)
# Directories will be searched in order
path_flags = _make_flags(override_paths + lib_path_hints + additional_paths, "-L")
linker = _find_linker(repo_ctx)
for archive_name in archive_names:
cmd = """
{} -verbose -l:{} {} 2>/dev/null | \\
grep succeeded | \\
head -1 | \\
sed -e 's/^\\s*attempt to open //' -e 's/ succeeded\\s*$//'
""".format(
linker,
archive_name,
path_flags,
)
path = _execute_bash(repo_ctx, cmd)
if path:
return (archive_name, path)
return ("", "")
def _find_header_path(repo_ctx, lib_name, header_name, includes):
override_paths = _get_list_from_env_var(repo_ctx, BAZEL_INCLUDE_OVERRIDE_PATHS_ENV_VAR, lib_name)
additional_paths = _get_list_from_env_var(repo_ctx, BAZEL_INCLUDE_ADDITIONAL_PATHS_ENV_VAR, lib_name)
# See https://gcc.gnu.org/onlinedocs/gcc/Directory-Options.html
override_include_flags = _make_flags(override_paths, "-I")
standard_include_flags = _make_flags(includes, "-isystem")
additional_include_flags = _make_flags(additional_paths, "-idirafter")
compiler = _find_compiler(repo_ctx)
# Taken from https://stackoverflow.com/questions/63052707/which-header-exactly-will-c-preprocessor-include/63052918#63052918
cmd = """
f=\"{}\"; \\
echo | \\
{} -E {} {} {} -Wp,-v - 2>&1 | \\
sed '\\~^ /~!d; s/ //' | \\
while IFS= read -r path; \\
do if [[ -e \"$path/$f\" ]]; \\
then echo \"$path/$f\"; \\
break; \\
fi; \\
done
""".format(
header_name,
compiler,
override_include_flags,
standard_include_flags,
additional_include_flags,
)
return _execute_bash(repo_ctx, cmd)
def system_library_impl(repo_ctx):
repo_name = repo_ctx.attr.name
includes = repo_ctx.attr.includes
hdrs = repo_ctx.attr.hdrs
optional_hdrs = repo_ctx.attr.optional_hdrs
deps = repo_ctx.attr.deps
lib_path_hints = repo_ctx.attr.lib_path_hints
static_lib_names = repo_ctx.attr.static_lib_names
shared_lib_names = repo_ctx.attr.shared_lib_names
static_lib_name, static_lib_path = _find_lib_path(repo_ctx, repo_name, static_lib_names, lib_path_hints)
shared_lib_name, shared_lib_path = _find_lib_path(repo_ctx, repo_name, shared_lib_names, lib_path_hints)
if not static_lib_path and not shared_lib_path:
fail("Library {} could not be found".format(repo_name))
hdr_names = []
hdr_paths = []
for hdr in hdrs:
hdr_path = _find_header_path(repo_ctx, repo_name, hdr, includes)
if hdr_path:
repo_ctx.symlink(hdr_path, hdr)
hdr_names.append(hdr)
hdr_paths.append(hdr_path)
else:
fail("Could not find required header {}".format(hdr))
for hdr in optional_hdrs:
hdr_path = _find_header_path(repo_ctx, repo_name, hdr, includes)
if hdr_path:
repo_ctx.symlink(hdr_path, hdr)
hdr_names.append(hdr)
hdr_paths.append(hdr_path)
hdrs_param = "hdrs = {},".format(str(hdr_names))
# This is needed for the case when quote-includes and system-includes alternate in the include chain, i.e.
# #include <SDL2/SDL.h> -> #include "SDL_main.h" -> #include <SDL2/_real_SDL_config.h> -> #include "SDL_platform.h"
# The problem is that the quote-includes are assumed to be
# in the same directory as the header they are included from - they have no subdir prefix ("SDL2/") in their paths
include_subdirs = {}
for hdr in hdr_names:
path_segments = hdr.split("/")
path_segments.pop()
current_path_segments = ["external", repo_name]
for segment in path_segments:
current_path_segments.append(segment)
current_path = "/".join(current_path_segments)
include_subdirs.update({current_path: None})
includes_param = "includes = {},".format(str(include_subdirs.keys()))
deps_names = []
for dep in deps:
dep_name = repr("@" + dep)
deps_names.append(dep_name)
deps_param = "deps = [{}],".format(",".join(deps_names))
link_hdrs_command = "mkdir -p $(RULEDIR)/remote \n"
remote_hdrs = []
for path, hdr in zip(hdr_paths, hdr_names):
remote_hdr = "remote/" + hdr
remote_hdrs.append(remote_hdr)
link_hdrs_command += "cp {path} $(RULEDIR)/{hdr}\n ".format(
path = path,
hdr = remote_hdr,
)
link_remote_static_library_genrule = ""
link_remote_shared_library_genrule = ""
remote_static_library_param = ""
remote_shared_library_param = ""
static_library_param = ""
shared_library_param = ""
if static_lib_path:
repo_ctx.symlink(static_lib_path, static_lib_name)
static_library_param = "static_library = \"{}\",".format(static_lib_name)
remote_static_library = "remote/" + static_lib_name
link_library_command = "mkdir -p $(RULEDIR)/remote && cp {path} $(RULEDIR)/{lib}".format(
path = static_lib_path,
lib = remote_static_library,
)
remote_static_library_param = "static_library = \"remote_link_static_library\","
link_remote_static_library_genrule = \
"""
genrule(
name = "remote_link_static_library",
outs = ["{remote_static_library}"],
cmd = {link_library_command}
)
""".format(
link_library_command = repr(link_library_command),
remote_static_library = remote_static_library,
)
if shared_lib_path:
repo_ctx.symlink(shared_lib_path, shared_lib_name)
shared_library_param = "shared_library = \"{}\",".format(shared_lib_name)
remote_shared_library = "remote/" + shared_lib_name
link_library_command = "mkdir -p $(RULEDIR)/remote && cp {path} $(RULEDIR)/{lib}".format(
path = shared_lib_path,
lib = remote_shared_library,
)
remote_shared_library_param = "shared_library = \"remote_link_shared_library\","
link_remote_shared_library_genrule = \
"""
genrule(
name = "remote_link_shared_library",
outs = ["{remote_shared_library}"],
cmd = {link_library_command}
)
""".format(
link_library_command = repr(link_library_command),
remote_shared_library = remote_shared_library,
)
repo_ctx.file(
"BUILD",
executable = False,
content =
"""
load("@bazel_tools//tools/build_defs/cc:cc_import.bzl", "cc_import")
cc_import(
name = "local_includes",
{static_library}
{shared_library}
{hdrs}
{deps}
{includes}
)
genrule(
name = "remote_link_headers",
outs = {remote_hdrs},
cmd = {link_hdrs_command}
)
{link_remote_static_library_genrule}
{link_remote_shared_library_genrule}
cc_import(
name = "remote_includes",
hdrs = [":remote_link_headers"],
{remote_static_library}
{remote_shared_library}
{deps}
{includes}
)
alias(
name = "{name}",
actual = select({{
"@bazel_tools//src/conditions:remote": "remote_includes",
"//conditions:default": "local_includes",
}}),
visibility = ["//visibility:public"],
)
""".format(
static_library = static_library_param,
shared_library = shared_library_param,
hdrs = hdrs_param,
deps = deps_param,
hdr_names = str(hdr_names),
link_hdrs_command = repr(link_hdrs_command),
link_library_command = repr(link_library_command),
name = repo_name,
includes = includes_param,
remote_hdrs = remote_hdrs,
link_remote_static_library_genrule = link_remote_static_library_genrule,
link_remote_shared_library_genrule = link_remote_shared_library_genrule,
remote_static_library = remote_static_library_param,
remote_shared_library = remote_shared_library_param,
),
)
system_library = repository_rule(
implementation = system_library_impl,
local = True,
remotable = True,
environ = [
BAZEL_LIB_ADDITIONAL_PATHS_ENV_VAR,
BAZEL_LIB_OVERRIDE_PATHS_ENV_VAR,
BAZEL_INCLUDE_ADDITIONAL_PATHS_ENV_VAR,
BAZEL_INCLUDE_OVERRIDE_PATHS_ENV_VAR,
],
attrs = {
"static_lib_names": attr.string_list(),
"shared_lib_names": attr.string_list(),
"lib_path_hints": attr.string_list(),
"includes": attr.string_list(),
"hdrs": attr.string_list(mandatory = True, allow_empty = False),
"optional_hdrs": attr.string_list(),
"deps": attr.string_list(),
},
)

View File

@ -0,0 +1,10 @@
sh_test(
name = "system_library_test",
size = "small",
srcs = ["system_library_test.sh"],
data = [
":unittest.bash",
"@bazel_tools//tools/bash/runfiles",
"//cc:system_library.bzl"
],
)

View File

@ -0,0 +1,165 @@
# --- begin runfiles.bash initialization ---
set -euo pipefail
if [[ ! -d "${RUNFILES_DIR:-/dev/null}" && ! -f "${RUNFILES_MANIFEST_FILE:-/dev/null}" ]]; then
if [[ -f "$0.runfiles_manifest" ]]; then
export RUNFILES_MANIFEST_FILE="$0.runfiles_manifest"
elif [[ -f "$0.runfiles/MANIFEST" ]]; then
export RUNFILES_MANIFEST_FILE="$0.runfiles/MANIFEST"
elif [[ -f "$0.runfiles/bazel_tools/tools/bash/runfiles/runfiles.bash" ]]; then
export RUNFILES_DIR="$0.runfiles"
fi
fi
if [[ -f "${RUNFILES_DIR:-/dev/null}/bazel_tools/tools/bash/runfiles/runfiles.bash" ]]; then
source "${RUNFILES_DIR}/bazel_tools/tools/bash/runfiles/runfiles.bash"
elif [[ -f "${RUNFILES_MANIFEST_FILE:-/dev/null}" ]]; then
source "$(grep -m1 "^bazel_tools/tools/bash/runfiles/runfiles.bash " \
"$RUNFILES_MANIFEST_FILE" | cut -d ' ' -f 2-)"
else
echo >&2 "ERROR: cannot find @bazel_tools//tools/bash/runfiles:runfiles.bash"
exit 1
fi
# --- end runfiles.bash initialization ---
source "$(rlocation rules_cc/tests/system_library/unittest.bash)" \
|| { echo "Could not rules_cc/source tests/system_library/unittest.bash" >&2; exit 1; }
#### TESTS #############################################################
function test_system_library() {
mkdir -p systemlib
cat << EOF > systemlib/foo.cc
int bar() {
return 42;
}
EOF
cat << EOF > systemlib/foo.h
int bar();
EOF
cd systemlib
g++ -c -fpic foo.cc || fail "Expected foo.o to build successfully"
g++ -shared -o libfoo.so foo.o || fail "Expected foo.so to build successfully"
g++ -c foo.cc || fail "Expected foo.o to build successfully"
ar rvs foo.a foo.o || fail "Expected foo.a to build successfully"
cd ..
cat << EOF > WORKSPACE
load("//:cc/system_library.bzl", "system_library")
system_library(
name = "foo",
hdrs = [
"foo.h",
],
static_lib_names = ["libfoo.a"],
shared_lib_names = ["libfoo.so"]
)
system_library(
name = "foo_hardcoded_path",
hdrs = [
"foo.h",
],
static_lib_names = ["libfoo.a"],
shared_lib_names = ["libfoo.so"],
lib_path_hints = ["${PWD}/systemlib"],
includes = ["${PWD}/systemlib"]
)
EOF
cat << EOF > BUILD
cc_binary(
name = "test",
srcs = ["test.cc"],
deps = ["@foo"]
)
cc_binary(
name = "test_static",
srcs = ["test.cc"],
deps = ["@foo"],
linkstatic = True
)
cc_binary(
name = "test_hardcoded_path",
srcs = ["test.cc"],
deps = ["@foo_hardcoded_path"]
)
cc_binary(
name = "test_static_hardcoded_path",
srcs = ["test.cc"],
deps = ["@foo_hardcoded_path"],
linkstatic = True
)
EOF
cat << EOF > test.cc
#include "foo.h"
int main() {
return 42 - bar();
}
EOF
# Make sure it fails with a correct message when no library is found
bazel run //:test \
--experimental_starlark_cc_import \
--experimental_repo_remote_exec \
&> $TEST_log \
|| true
expect_log "Library foo could not be found"
bazel run //:test_static \
--experimental_starlark_cc_import \
--experimental_repo_remote_exec \
&> $TEST_log \
|| true
expect_log "Library foo could not be found"
# Test override paths
bazel run //:test \
--experimental_starlark_cc_import \
--experimental_repo_remote_exec \
--action_env=BAZEL_LIB_OVERRIDE_PATHS=foo="${PWD}"/systemlib \
--action_env=BAZEL_INCLUDE_OVERRIDE_PATHS=foo="${PWD}"/systemlib \
|| fail "Expected test to run successfully"
bazel run //:test_static \
--experimental_starlark_cc_import \
--experimental_repo_remote_exec \
--action_env=BAZEL_LIB_OVERRIDE_PATHS=foo="${PWD}"/systemlib \
--action_env=BAZEL_INCLUDE_OVERRIDE_PATHS=foo="${PWD}"/systemlib \
|| fail "Expected test_static to run successfully"
# Test additional paths
bazel run //:test \
--experimental_starlark_cc_import \
--experimental_repo_remote_exec \
--action_env=BAZEL_LIB_ADDITIONAL_PATHS=foo="${PWD}"/systemlib \
--action_env=BAZEL_INCLUDE_ADDITIONAL_PATHS=foo="${PWD}"/systemlib \
|| fail "Expected test to run successfully"
bazel run //:test_static \
--experimental_starlark_cc_import \
--experimental_repo_remote_exec \
--action_env=BAZEL_LIB_ADDITIONAL_PATHS=foo="${PWD}"/systemlib \
--action_env=BAZEL_INCLUDE_ADDITIONAL_PATHS=foo="${PWD}"/systemlib \
|| fail "Expected test_static to run successfully"
# Test hardcoded paths
bazel run //:test_hardcoded_path \
--experimental_starlark_cc_import \
--experimental_repo_remote_exec \
|| fail "Expected test_hardcoded_path to run successfully"
bazel run //:test_static_hardcoded_path \
--experimental_starlark_cc_import \
--experimental_repo_remote_exec \
|| fail "Expected test_static_hardcoded_path to run successfully"
}
run_suite "Integration tests for system_library."

View File

@ -0,0 +1,801 @@
#!/bin/bash
#
# Copyright 2015 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Common utility file for Bazel shell tests
#
# unittest.bash: a unit test framework in Bash.
#
# A typical test suite looks like so:
#
# ------------------------------------------------------------------------
# #!/bin/bash
#
# source path/to/unittest.bash || exit 1
#
# # Test that foo works.
# function test_foo() {
# foo >$TEST_log || fail "foo failed";
# expect_log "blah" "Expected to see 'blah' in output of 'foo'."
# }
#
# # Test that bar works.
# function test_bar() {
# bar 2>$TEST_log || fail "bar failed";
# expect_not_log "ERROR" "Unexpected error from 'bar'."
# ...
# assert_equals $x $y
# }
#
# run_suite "Test suite for blah"
# ------------------------------------------------------------------------
#
# Each test function is considered to pass iff fail() is not called
# while it is active. fail() may be called directly, or indirectly
# via other assertions such as expect_log(). run_suite must be called
# at the very end.
#
# A test function may redefine functions "set_up" and/or "tear_down";
# these functions are executed before and after each test function,
# respectively. Similarly, "cleanup" and "timeout" may be redefined,
# and these function are called upon exit (of any kind) or a timeout.
#
# The user can pass --test_arg to bazel test to select specific tests
# to run. Specifying --test_arg multiple times allows to select several
# tests to be run in the given order. Additionally the user may define
# TESTS=(test_foo test_bar ...) to specify a subset of test functions to
# execute, for example, a working set during debugging. By default, all
# functions called test_* will be executed.
#
# This file provides utilities for assertions over the output of a
# command. The output of the command under test is directed to the
# file $TEST_log, and then the expect_log* assertions can be used to
# test for the presence of certain regular expressions in that file.
#
# The test framework is responsible for restoring the original working
# directory before each test.
#
# The order in which test functions are run is not defined, so it is
# important that tests clean up after themselves.
#
# Each test will be run in a new subshell.
#
# Functions named __* are not intended for use by clients.
#
# This framework implements the "test sharding protocol".
#
[ -n "$BASH_VERSION" ] ||
{ echo "unittest.bash only works with bash!" >&2; exit 1; }
DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
#### Configuration variables (may be overridden by testenv.sh or the suite):
# This function may be called by testenv.sh or a test suite to enable errexit
# in a way that enables us to print pretty stack traces when something fails.
function enable_errexit() {
set -o errtrace
set -eu
trap __test_terminated_err ERR
}
function disable_errexit() {
set +o errtrace
set +eu
trap - ERR
}
#### Set up the test environment, branched from the old shell/testenv.sh
# Enable errexit with pretty stack traces.
enable_errexit
# Print message in "$1" then exit with status "$2"
die () {
# second argument is optional, defaulting to 1
local status_code=${2:-1}
# Stop capturing stdout/stderr, and dump captured output
if [ "$CAPTURED_STD_ERR" -ne 0 -o "$CAPTURED_STD_OUT" -ne 0 ]; then
restore_outputs
if [ "$CAPTURED_STD_OUT" -ne 0 ]; then
cat "${TEST_TMPDIR}/captured.out"
CAPTURED_STD_OUT=0
fi
if [ "$CAPTURED_STD_ERR" -ne 0 ]; then
cat "${TEST_TMPDIR}/captured.err" 1>&2
CAPTURED_STD_ERR=0
fi
fi
if [ -n "${1-}" ] ; then
echo "$1" 1>&2
fi
if [ -n "${BASH-}" ]; then
local caller_n=0
while [ $caller_n -lt 4 ] && caller_out=$(caller $caller_n 2>/dev/null); do
test $caller_n -eq 0 && echo "CALLER stack (max 4):"
echo " $caller_out"
let caller_n=caller_n+1
done 1>&2
fi
if [ x"$status_code" != x -a x"$status_code" != x"0" ]; then
exit "$status_code"
else
exit 1
fi
}
# Print message in "$1" then record that a non-fatal error occurred in ERROR_COUNT
ERROR_COUNT="${ERROR_COUNT:-0}"
error () {
if [ -n "$1" ] ; then
echo "$1" 1>&2
fi
ERROR_COUNT=$(($ERROR_COUNT + 1))
}
# Die if "$1" != "$2", print $3 as death reason
check_eq () {
[ "$1" = "$2" ] || die "Check failed: '$1' == '$2' ${3:+ ($3)}"
}
# Die if "$1" == "$2", print $3 as death reason
check_ne () {
[ "$1" != "$2" ] || die "Check failed: '$1' != '$2' ${3:+ ($3)}"
}
# The structure of the following if statements is such that if '[' fails
# (e.g., a non-number was passed in) then the check will fail.
# Die if "$1" > "$2", print $3 as death reason
check_le () {
[ "$1" -gt "$2" ] || die "Check failed: '$1' <= '$2' ${3:+ ($3)}"
}
# Die if "$1" >= "$2", print $3 as death reason
check_lt () {
[ "$1" -lt "$2" ] || die "Check failed: '$1' < '$2' ${3:+ ($3)}"
}
# Die if "$1" < "$2", print $3 as death reason
check_ge () {
[ "$1" -ge "$2" ] || die "Check failed: '$1' >= '$2' ${3:+ ($3)}"
}
# Die if "$1" <= "$2", print $3 as death reason
check_gt () {
[ "$1" -gt "$2" ] || die "Check failed: '$1' > '$2' ${3:+ ($3)}"
}
# Die if $2 !~ $1; print $3 as death reason
check_match ()
{
expr match "$2" "$1" >/dev/null || \
die "Check failed: '$2' does not match regex '$1' ${3:+ ($3)}"
}
# Run command "$1" at exit. Like "trap" but multiple atexits don't
# overwrite each other. Will break if someone does call trap
# directly. So, don't do that.
ATEXIT="${ATEXIT-}"
atexit () {
if [ -z "$ATEXIT" ]; then
ATEXIT="$1"
else
ATEXIT="$1 ; $ATEXIT"
fi
trap "$ATEXIT" EXIT
}
## TEST_TMPDIR
if [ -z "${TEST_TMPDIR:-}" ]; then
export TEST_TMPDIR="$(mktemp -d ${TMPDIR:-/tmp}/bazel-test.XXXXXXXX)"
fi
if [ ! -e "${TEST_TMPDIR}" ]; then
mkdir -p -m 0700 "${TEST_TMPDIR}"
# Clean TEST_TMPDIR on exit
atexit "rm -fr ${TEST_TMPDIR}"
fi
# Functions to compare the actual output of a test to the expected
# (golden) output.
#
# Usage:
# capture_test_stdout
# ... do something ...
# diff_test_stdout "$TEST_SRCDIR/path/to/golden.out"
# Redirect a file descriptor to a file.
CAPTURED_STD_OUT="${CAPTURED_STD_OUT:-0}"
CAPTURED_STD_ERR="${CAPTURED_STD_ERR:-0}"
capture_test_stdout () {
exec 3>&1 # Save stdout as fd 3
exec 4>"${TEST_TMPDIR}/captured.out"
exec 1>&4
CAPTURED_STD_OUT=1
}
capture_test_stderr () {
exec 6>&2 # Save stderr as fd 6
exec 7>"${TEST_TMPDIR}/captured.err"
exec 2>&7
CAPTURED_STD_ERR=1
}
# Force XML_OUTPUT_FILE to an existing path
if [ -z "${XML_OUTPUT_FILE:-}" ]; then
XML_OUTPUT_FILE=${TEST_TMPDIR}/ouput.xml
fi
#### Global variables:
TEST_name="" # The name of the current test.
TEST_log=$TEST_TMPDIR/log # The log file over which the
# expect_log* assertions work. Must
# be absolute to be robust against
# tests invoking 'cd'!
TEST_passed="true" # The result of the current test;
# failed assertions cause this to
# become false.
# These variables may be overridden by the test suite:
TESTS=() # A subset or "working set" of test
# functions that should be run. By
# default, all tests called test_* are
# run.
if [ $# -gt 0 ]; then
# Legacy behavior is to ignore missing regexp, but with errexit
# the following line fails without || true.
# TODO(dmarting): maybe we should revisit the way of selecting
# test with that framework (use Bazel's environment variable instead).
TESTS=($(for i in $@; do echo $i; done | grep ^test_ || true))
if (( ${#TESTS[@]} == 0 )); then
echo "WARNING: Arguments do not specifies tests!" >&2
fi
fi
TEST_verbose="true" # Whether or not to be verbose. A
# command; "true" or "false" are
# acceptable. The default is: true.
TEST_script="$(pwd)/$0" # Full path to test script
#### Internal functions
function __show_log() {
echo "-- Test log: -----------------------------------------------------------"
[[ -e $TEST_log ]] && cat $TEST_log || echo "(Log file did not exist.)"
echo "------------------------------------------------------------------------"
}
# Usage: __pad <title> <pad-char>
# Print $title padded to 80 columns with $pad_char.
function __pad() {
local title=$1
local pad=$2
{
echo -n "$pad$pad $title "
printf "%80s" " " | tr ' ' "$pad"
} | head -c 80
echo
}
#### Exported functions
# Usage: init_test ...
# Deprecated. Has no effect.
function init_test() {
:
}
# Usage: set_up
# Called before every test function. May be redefined by the test suite.
function set_up() {
:
}
# Usage: tear_down
# Called after every test function. May be redefined by the test suite.
function tear_down() {
:
}
# Usage: cleanup
# Called upon eventual exit of the test suite. May be redefined by
# the test suite.
function cleanup() {
:
}
# Usage: timeout
# Called upon early exit from a test due to timeout.
function timeout() {
:
}
# Usage: fail <message> [<message> ...]
# Print failure message with context information, and mark the test as
# a failure. The context includes a stacktrace including the longest sequence
# of calls outside this module. (We exclude the top and bottom portions of
# the stack because they just add noise.) Also prints the contents of
# $TEST_log.
function fail() {
__show_log >&2
echo "$TEST_name FAILED:" "$@" "." >&2
echo "$@" >$TEST_TMPDIR/__fail
TEST_passed="false"
__show_stack
# Cleanup as we are leaving the subshell now
tear_down
exit 1
}
# Usage: warn <message>
# Print a test warning with context information.
# The context includes a stacktrace including the longest sequence
# of calls outside this module. (We exclude the top and bottom portions of
# the stack because they just add noise.)
function warn() {
__show_log >&2
echo "$TEST_name WARNING: $1." >&2
__show_stack
if [ -n "${TEST_WARNINGS_OUTPUT_FILE:-}" ]; then
echo "$TEST_name WARNING: $1." >> "$TEST_WARNINGS_OUTPUT_FILE"
fi
}
# Usage: show_stack
# Prints the portion of the stack that does not belong to this module,
# i.e. the user's code that called a failing assertion. Stack may not
# be available if Bash is reading commands from stdin; an error is
# printed in that case.
__show_stack() {
local i=0
local trace_found=0
# Skip over active calls within this module:
while (( i < ${#FUNCNAME[@]} )) && [[ ${BASH_SOURCE[i]:-} == ${BASH_SOURCE[0]} ]]; do
(( ++i ))
done
# Show all calls until the next one within this module (typically run_suite):
while (( i < ${#FUNCNAME[@]} )) && [[ ${BASH_SOURCE[i]:-} != ${BASH_SOURCE[0]} ]]; do
# Read online docs for BASH_LINENO to understand the strange offset.
# Undefined can occur in the BASH_SOURCE stack apparently when one exits from a subshell
echo "${BASH_SOURCE[i]:-"Unknown"}:${BASH_LINENO[i - 1]:-"Unknown"}: in call to ${FUNCNAME[i]:-"Unknown"}" >&2
(( ++i ))
trace_found=1
done
[ $trace_found = 1 ] || echo "[Stack trace not available]" >&2
}
# Usage: expect_log <regexp> [error-message]
# Asserts that $TEST_log matches regexp. Prints the contents of
# $TEST_log and the specified (optional) error message otherwise, and
# returns non-zero.
function expect_log() {
local pattern=$1
local message=${2:-Expected regexp "$pattern" not found}
grep -sq -- "$pattern" $TEST_log && return 0
fail "$message"
return 1
}
# Usage: expect_log_warn <regexp> [error-message]
# Warns if $TEST_log does not match regexp. Prints the contents of
# $TEST_log and the specified (optional) error message on mismatch.
function expect_log_warn() {
local pattern=$1
local message=${2:-Expected regexp "$pattern" not found}
grep -sq -- "$pattern" $TEST_log && return 0
warn "$message"
return 1
}
# Usage: expect_log_once <regexp> [error-message]
# Asserts that $TEST_log contains one line matching <regexp>.
# Prints the contents of $TEST_log and the specified (optional)
# error message otherwise, and returns non-zero.
function expect_log_once() {
local pattern=$1
local message=${2:-Expected regexp "$pattern" not found exactly once}
expect_log_n "$pattern" 1 "$message"
}
# Usage: expect_log_n <regexp> <count> [error-message]
# Asserts that $TEST_log contains <count> lines matching <regexp>.
# Prints the contents of $TEST_log and the specified (optional)
# error message otherwise, and returns non-zero.
function expect_log_n() {
local pattern=$1
local expectednum=${2:-1}
local message=${3:-Expected regexp "$pattern" not found exactly $expectednum times}
local count=$(grep -sc -- "$pattern" $TEST_log)
[[ $count = $expectednum ]] && return 0
fail "$message"
return 1
}
# Usage: expect_not_log <regexp> [error-message]
# Asserts that $TEST_log does not match regexp. Prints the contents
# of $TEST_log and the specified (optional) error message otherwise, and
# returns non-zero.
function expect_not_log() {
local pattern=$1
local message=${2:-Unexpected regexp "$pattern" found}
grep -sq -- "$pattern" $TEST_log || return 0
fail "$message"
return 1
}
# Usage: expect_log_with_timeout <regexp> <timeout> [error-message]
# Waits for the given regexp in the $TEST_log for up to timeout seconds.
# Prints the contents of $TEST_log and the specified (optional)
# error message otherwise, and returns non-zero.
function expect_log_with_timeout() {
local pattern=$1
local timeout=$2
local message=${3:-Regexp "$pattern" not found in "$timeout" seconds}
local count=0
while [ $count -lt $timeout ]; do
grep -sq -- "$pattern" $TEST_log && return 0
let count=count+1
sleep 1
done
grep -sq -- "$pattern" $TEST_log && return 0
fail "$message"
return 1
}
# Usage: expect_cmd_with_timeout <expected> <cmd> [timeout]
# Repeats the command once a second for up to timeout seconds (10s by default),
# until the output matches the expected value. Fails and returns 1 if
# the command does not return the expected value in the end.
function expect_cmd_with_timeout() {
local expected="$1"
local cmd="$2"
local timeout=${3:-10}
local count=0
while [ $count -lt $timeout ]; do
local actual="$($cmd)"
[ "$expected" = "$actual" ] && return 0
let count=count+1
sleep 1
done
[ "$expected" = "$actual" ] && return 0
fail "Expected '$expected' within ${timeout}s, was '$actual'"
return 1
}
# Usage: assert_one_of <expected_list>... <actual>
# Asserts that actual is one of the items in expected_list
# Example: assert_one_of ( "foo", "bar", "baz" ) actualval
function assert_one_of() {
local args=("$@")
local last_arg_index=$((${#args[@]} - 1))
local actual=${args[last_arg_index]}
unset args[last_arg_index]
for expected_item in "${args[@]}"; do
[ "$expected_item" = "$actual" ] && return 0
done;
fail "Expected one of '${args[@]}', was '$actual'"
return 1
}
# Usage: assert_equals <expected> <actual>
# Asserts [ expected = actual ].
function assert_equals() {
local expected=$1 actual=$2
[ "$expected" = "$actual" ] && return 0
fail "Expected '$expected', was '$actual'"
return 1
}
# Usage: assert_not_equals <unexpected> <actual>
# Asserts [ unexpected != actual ].
function assert_not_equals() {
local unexpected=$1 actual=$2
[ "$unexpected" != "$actual" ] && return 0;
fail "Expected not '$unexpected', was '$actual'"
return 1
}
# Usage: assert_contains <regexp> <file> [error-message]
# Asserts that file matches regexp. Prints the contents of
# file and the specified (optional) error message otherwise, and
# returns non-zero.
function assert_contains() {
local pattern=$1
local file=$2
local message=${3:-Expected regexp "$pattern" not found in "$file"}
grep -sq -- "$pattern" "$file" && return 0
cat "$file" >&2
fail "$message"
return 1
}
# Usage: assert_not_contains <regexp> <file> [error-message]
# Asserts that file does not match regexp. Prints the contents of
# file and the specified (optional) error message otherwise, and
# returns non-zero.
function assert_not_contains() {
local pattern=$1
local file=$2
local message=${3:-Expected regexp "$pattern" found in "$file"}
grep -sq -- "$pattern" "$file" || return 0
cat "$file" >&2
fail "$message"
return 1
}
# Updates the global variables TESTS if
# sharding is enabled, i.e. ($TEST_TOTAL_SHARDS > 0).
function __update_shards() {
[ -z "${TEST_TOTAL_SHARDS-}" ] && return 0
[ "$TEST_TOTAL_SHARDS" -gt 0 ] ||
{ echo "Invalid total shards $TEST_TOTAL_SHARDS" >&2; exit 1; }
[ "$TEST_SHARD_INDEX" -lt 0 -o "$TEST_SHARD_INDEX" -ge "$TEST_TOTAL_SHARDS" ] &&
{ echo "Invalid shard $shard_index" >&2; exit 1; }
TESTS=$(for test in "${TESTS[@]}"; do echo "$test"; done |
awk "NR % $TEST_TOTAL_SHARDS == $TEST_SHARD_INDEX")
[ -z "${TEST_SHARD_STATUS_FILE-}" ] || touch "$TEST_SHARD_STATUS_FILE"
}
# Usage: __test_terminated <signal-number>
# Handler that is called when the test terminated unexpectedly
function __test_terminated() {
__show_log >&2
echo "$TEST_name FAILED: terminated by signal $1." >&2
TEST_passed="false"
__show_stack
timeout
exit 1
}
# Usage: __test_terminated_err
# Handler that is called when the test terminated unexpectedly due to "errexit".
function __test_terminated_err() {
# When a subshell exits due to signal ERR, its parent shell also exits,
# thus the signal handler is called recursively and we print out the
# error message and stack trace multiple times. We're only interested
# in the first one though, as it contains the most information, so ignore
# all following.
if [[ -f $TEST_TMPDIR/__err_handled ]]; then
exit 1
fi
__show_log >&2
if [[ ! -z "$TEST_name" ]]; then
echo -n "$TEST_name "
fi
echo "FAILED: terminated because this command returned a non-zero status:" >&2
touch $TEST_TMPDIR/__err_handled
TEST_passed="false"
__show_stack
# If $TEST_name is still empty, the test suite failed before we even started
# to run tests, so we shouldn't call tear_down.
if [[ ! -z "$TEST_name" ]]; then
tear_down
fi
exit 1
}
# Usage: __trap_with_arg <handler> <signals ...>
# Helper to install a trap handler for several signals preserving the signal
# number, so that the signal number is available to the trap handler.
function __trap_with_arg() {
func="$1" ; shift
for sig ; do
trap "$func $sig" "$sig"
done
}
# Usage: <node> <block>
# Adds the block to the given node in the report file. Quotes in the in
# arguments need to be escaped.
function __log_to_test_report() {
local node="$1"
local block="$2"
if [[ ! -e "$XML_OUTPUT_FILE" ]]; then
local xml_header='<?xml version="1.0" encoding="UTF-8"?>'
echo "$xml_header<testsuites></testsuites>" > $XML_OUTPUT_FILE
fi
# replace match on node with block and match
# replacement expression only needs escaping for quotes
perl -e "\
\$input = @ARGV[0]; \
\$/=undef; \
open FILE, '+<$XML_OUTPUT_FILE'; \
\$content = <FILE>; \
if (\$content =~ /($node.*)\$/) { \
seek FILE, 0, 0; \
print FILE \$\` . \$input . \$1; \
}; \
close FILE" "$block"
}
# Usage: <total> <passed>
# Adds the test summaries to the xml nodes.
function __finish_test_report() {
local total=$1
local passed=$2
local failed=$((total - passed))
cat $XML_OUTPUT_FILE | \
sed \
"s/<testsuites>/<testsuites tests=\"$total\" failures=\"0\" errors=\"$failed\">/" | \
sed \
"s/<testsuite>/<testsuite tests=\"$total\" failures=\"0\" errors=\"$failed\">/" \
> $XML_OUTPUT_FILE.bak
rm -f $XML_OUTPUT_FILE
mv $XML_OUTPUT_FILE.bak $XML_OUTPUT_FILE
}
# Multi-platform timestamp function
UNAME=$(uname -s | tr 'A-Z' 'a-z')
if [ "$UNAME" = "linux" ] || [[ "$UNAME" =~ msys_nt* ]]; then
function timestamp() {
echo $(($(date +%s%N)/1000000))
}
else
function timestamp() {
# OS X and FreeBSD do not have %N so python is the best we can do
python -c 'import time; print int(round(time.time() * 1000))'
}
fi
function get_run_time() {
local ts_start=$1
local ts_end=$2
run_time_ms=$((${ts_end}-${ts_start}))
echo $(($run_time_ms/1000)).${run_time_ms: -3}
}
# Usage: run_tests <suite-comment>
# Must be called from the end of the user's test suite.
# Calls exit with zero on success, non-zero otherwise.
function run_suite() {
echo >&2
echo "$1" >&2
echo >&2
__log_to_test_report "<\/testsuites>" "<testsuite></testsuite>"
local total=0
local passed=0
atexit "cleanup"
# If the user didn't specify an explicit list of tests (e.g. a
# working set), use them all.
if [ ${#TESTS[@]} = 0 ]; then
TESTS=$(declare -F | awk '{print $3}' | grep ^test_)
elif [ -n "${TEST_WARNINGS_OUTPUT_FILE:-}" ]; then
if grep -q "TESTS=" "$TEST_script" ; then
echo "TESTS variable overridden in Bazel sh_test. Please remove before submitting" \
>> "$TEST_WARNINGS_OUTPUT_FILE"
fi
fi
__update_shards
for TEST_name in ${TESTS[@]}; do
>$TEST_log # Reset the log.
TEST_passed="true"
total=$(($total + 1))
if [[ "$TEST_verbose" == "true" ]]; then
__pad $TEST_name '*' >&2
fi
local run_time="0.0"
rm -f $TEST_TMPDIR/{__ts_start,__ts_end}
if [ "$(type -t $TEST_name)" = function ]; then
# Save exit handlers eventually set.
local SAVED_ATEXIT="$ATEXIT";
ATEXIT=
# Run test in a subshell.
rm -f $TEST_TMPDIR/__err_handled
__trap_with_arg __test_terminated INT KILL PIPE TERM ABRT FPE ILL QUIT SEGV
(
timestamp >$TEST_TMPDIR/__ts_start
set_up
eval $TEST_name
tear_down
timestamp >$TEST_TMPDIR/__ts_end
test $TEST_passed == "true"
) 2>&1 | tee $TEST_TMPDIR/__log
# Note that tee will prevent the control flow continuing if the test
# spawned any processes which are still running and have not closed
# their stdout.
test_subshell_status=${PIPESTATUS[0]}
if [ "$test_subshell_status" != 0 ]; then
TEST_passed="false"
# Ensure that an end time is recorded in case the test subshell
# terminated prematurely.
[ -f $TEST_TMPDIR/__ts_end ] || timestamp >$TEST_TMPDIR/__ts_end
fi
# Calculate run time for the testcase.
local ts_start=$(cat $TEST_TMPDIR/__ts_start)
local ts_end=$(cat $TEST_TMPDIR/__ts_end)
run_time=$(get_run_time $ts_start $ts_end)
# Eventually restore exit handlers.
if [ -n "$SAVED_ATEXIT" ]; then
ATEXIT="$SAVED_ATEXIT"
trap "$ATEXIT" EXIT
fi
else # Bad test explicitly specified in $TESTS.
fail "Not a function: '$TEST_name'"
fi
local testcase_tag=""
if [[ "$TEST_passed" == "true" ]]; then
if [[ "$TEST_verbose" == "true" ]]; then
echo "PASSED: $TEST_name" >&2
fi
passed=$(($passed + 1))
testcase_tag="<testcase name=\"$TEST_name\" status=\"run\" time=\"$run_time\" classname=\"\"></testcase>"
else
echo "FAILED: $TEST_name" >&2
# end marker in CDATA cannot be escaped, we need to split the CDATA sections
log=$(cat $TEST_TMPDIR/__log | sed 's/]]>/]]>]]&gt;<![CDATA[/g')
fail_msg=$(cat $TEST_TMPDIR/__fail 2> /dev/null || echo "No failure message")
testcase_tag="<testcase name=\"$TEST_name\" status=\"run\" time=\"$run_time\" classname=\"\"><error message=\"$fail_msg\"><![CDATA[$log]]></error></testcase>"
fi
if [[ "$TEST_verbose" == "true" ]]; then
echo >&2
fi
__log_to_test_report "<\/testsuite>" "$testcase_tag"
done
__finish_test_report $total $passed
__pad "$passed / $total tests passed." '*' >&2
[ $total = $passed ] || {
__pad "There were errors." '*'
exit 1
} >&2
exit 0
}