Create relocatable Conan install folder

install_script.cmake

# Run as `install(SCRIPT)`

execute_process(
    COMMAND
        conan install
            -l @CMAKE_BINARY_DIR@/conan.${CMAKE_INSTALL_CONFIG_NAME}.lock
            -g deploy
            -g CMakeDeps
            -if ${CMAKE_INSTALL_PREFIX}/packages
            @CMAKE_SOURCE_DIR@/conanfile.txt
    COMMAND_ERROR_IS_FATAL ANY
)

execute_process(
    COMMAND @Python3_EXECUTABLE@ @CMAKE_SOURCE_DIR@/patch_conan_cmake_files.py ${CMAKE_INSTALL_PREFIX}/packages
    COMMAND_ERROR_IS_FATAL ANY
)

patch_conan_cmake_files.py

import argparse
import os.path
from glob import glob
import re


def parse_args():
    parser = argparse.ArgumentParser()
    parser.add_argument('root', help='Path to directory containing Conan generated files')
    return parser.parse_args()


def main(args):
    match_pattern = re.compile(r'set\((?P<name>\S+)_PACKAGE_FOLDER_(?P<config>\S+) ".*"\)')
    replacement = r'set(\g<name>_PACKAGE_FOLDER_\g<config> "${CMAKE_CURRENT_LIST_DIR}/\g<name>")'

    for fname in glob(os.path.abspath(os.path.join(args.root, '*-data.cmake'))):
        with open(fname, 'r') as f:
            content = f.read()

        content = match_pattern.sub(replacement, content)

        with open(fname, 'w') as f:
            f.write(content)


main(parse_args())