sandboxed-api/cmake/libcap.cmake

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CMake
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# Copyright 2019 Google LLC
#
# 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
#
# https://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.
FetchContent_Declare(libcap
URL https://www.kernel.org/pub/linux/libs/security/linux-privs/libcap2/libcap-2.27.tar.gz
URL_HASH SHA256=260b549c154b07c3cdc16b9ccc93c04633c39f4fb6a4a3b8d1fa5b8a9c3f5fe8
)
FetchContent_MakeAvailable(libcap)
set(libcap_INCLUDE_DIR "${libcap_SOURCE_DIR}/libcap/include")
add_custom_command(OUTPUT ${libcap_SOURCE_DIR}/libcap/cap_names.list.h
VERBATIM
COMMAND # Use the same logic as libcap/Makefile
sed -ne [=[/^#define[ \\t]CAP[_A-Z]\+[ \\t]\+[0-9]\+/{s/^#define \([^ \\t]*\)[ \\t]*\([^ \\t]*\)/\{\"\1\",\2\},/p;}]=]
${libcap_SOURCE_DIR}/libcap/include/uapi/linux/capability.h |
tr [:upper:] [:lower:] > ${libcap_SOURCE_DIR}/libcap/cap_names.list.h
)
if (CMAKE_CROSSCOMPILING AND BUILD_C_COMPILER)
add_custom_command(OUTPUT ${libcap_SOURCE_DIR}/libcap/libcap_makenames
VERBATIM
# Use the same logic as libcap/Makefile
COMMAND ${BUILD_C_COMPILER} ${BUILD_C_FLAGS}
${libcap_SOURCE_DIR}/libcap/_makenames.c
-o ${libcap_SOURCE_DIR}/libcap/libcap_makenames
DEPENDS ${libcap_SOURCE_DIR}/libcap/cap_names.list.h
${libcap_SOURCE_DIR}/libcap/_makenames.c
)
add_custom_command(OUTPUT ${libcap_SOURCE_DIR}/libcap/cap_names.h
COMMAND ${libcap_SOURCE_DIR}/libcap/libcap_makenames >
${libcap_SOURCE_DIR}/libcap/cap_names.h
DEPENDS ${libcap_SOURCE_DIR}/libcap/libcap_makenames
)
else()
add_executable(libcap_makenames
${libcap_SOURCE_DIR}/libcap/cap_names.list.h
${libcap_SOURCE_DIR}/libcap/_makenames.c
)
target_include_directories(libcap_makenames PUBLIC
${libcap_SOURCE_DIR}/libcap
${libcap_SOURCE_DIR}/libcap/include
${libcap_SOURCE_DIR}/libcap/include/uapi
)
add_custom_command(OUTPUT ${libcap_SOURCE_DIR}/libcap/cap_names.h
COMMAND libcap_makenames > ${libcap_SOURCE_DIR}/libcap/cap_names.h
)
endif()
add_library(cap STATIC
${libcap_SOURCE_DIR}/libcap/cap_alloc.c
${libcap_SOURCE_DIR}/libcap/cap_extint.c
${libcap_SOURCE_DIR}/libcap/cap_file.c
${libcap_SOURCE_DIR}/libcap/cap_flag.c
${libcap_SOURCE_DIR}/libcap/cap_names.h
${libcap_SOURCE_DIR}/libcap/cap_proc.c
${libcap_SOURCE_DIR}/libcap/cap_text.c
${libcap_SOURCE_DIR}/libcap/include/uapi/linux/capability.h
${libcap_SOURCE_DIR}/libcap/libcap.h
)
add_library(libcap::libcap ALIAS cap)
target_include_directories(cap PUBLIC
${libcap_SOURCE_DIR}/libcap
${libcap_SOURCE_DIR}/libcap/include
${libcap_SOURCE_DIR}/libcap/include/uapi
)
target_compile_options(cap PRIVATE
-Wno-tautological-compare
-Wno-unused-result
)
target_compile_definitions(cap PRIVATE
# Work around sys/xattr.h not declaring this
-DXATTR_NAME_CAPS="\"security.capability\""
)
target_link_libraries(cap PRIVATE
sapi::base
)