Bug 15340

I'm building a package using CMake and adding a service file into /lib/systemd/system.  Installation works fine but when I remove the package it deletes the /lib directory.
Here's a minimum CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
project(simplePack)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_FLAGS -pthread)
add_executable(${PROJECT_NAME} "main.cpp")
install(TARGETS ${PROJECT_NAME} DESTINATION /etc/simple)
set(CPACK_DEBIAN_PACKAGE_DEPENDS "")
set(CPACK_PACKAGE_NAME "TEST-MODEL")
set(CPACK_PACKAGE_VENDOR InventDesignBuild)
set(CPACK_PACKAGE_VERSION_MAJOR "1")
set(CPACK_PACKAGE_VERSION_MINOR "2")
set(CPACK_PACKAGE_VERSION_PATCH "15")
set(CPACK_PACKAGE_CONTACT info@...)
set(CPACK_GENERATOR "DEB")
set(CPACK_SET_DESTDIR true)
set(CPACK_INSTALL_PREFIX "/")
install(FILES ${CMAKE_SOURCE_DIR}/hyperion-bridge.service DESTINATION lib/systemd/system)
set(CPACK_DEBIAN_PACKAGE_ARCHITECTURE "aarch64")
include(CPack)

This is a minimum build to reproduce the problem. The hyperion-bridge.service file is included at the end (I don't think its contents are relevant). 

The executable is a simple 'hello, world' - code at the end.

The package is installed correctly using;
# opkg -V4 install ./TEST-MODEL-1.2.15-Linux.deb


Here's the output for removing the package;

# opkg -V4 remove test-model                     
pkg_hash_load_status_files:
pkg_vec_insert_merge: Adding new pkg=test-model version=1.2.15 arch=aarch64.
pkg_info_preinstall_check: Updating file owner list.
Removing test-model (1.2.15) from root...
pkg_run_script: Running script //var/lib/opkg/info/test-model.prerm.
remove_data_files_and_list: Deleting /etc/simple/simplePack.
remove_data_files_and_list: Deleting /lib/systemd/system/hyperion-bridge.service.
remove_data_files_and_list: Deleting /etc/simple.
remove_data_files_and_list: Deleting /lib.
pkg_run_script: Running script //var/lib/opkg/info/test-model.postrm.
remove_maintainer_scripts: Deleting //var/lib/opkg/info/test-model.control.
remove_maintainer_scripts: Deleting //var/lib/opkg/info/test-model.md5sums.
write_status_files_if_changed: Writing status file.
pkg_write_changed_filelists: Saving changed filelists.
hash_table: pkg-hash, 24576 bytes
    n_buckets=1024, n_elements=1, n_collisions=0
    max_bucket_len=0, n_used_buckets=1, ave_bucket_len=1.00
    n_hits=1, n_misses=1
hash_table: file-hash, 24576 bytes
    n_buckets=1024, n_elements=7, n_collisions=0
    max_bucket_len=0, n_used_buckets=7, ave_bucket_len=1.00
    n_hits=10, n_misses=7
hash_table: dir-hash, 24576 bytes
    n_buckets=1024, n_elements=5, n_collisions=0
    max_bucket_len=0, n_used_buckets=5, ave_bucket_len=1.00
    n_hits=10, n_misses=5
hash_table: obs-file-hash, 1536 bytes
    n_buckets=64, n_elements=0, n_collisions=0
    max_bucket_len=0, n_used_buckets=0, ave_bucket_len=0.00
    n_hits=0, n_misses=0

For some reason opkg seems to be removing the /lib directory hence the Linux system becomes unusable. 

Initially I was using opkg 4.2 built as part of my 'buildroot' build. I also see exactly the same effect having built and tested version 6.3.

Interestingly the /etc/ directory is not deleted when removing the package.

// hyperion-bridge.service file //
[Unit]
Description=Hyperion MQTT bridge
Wants=network.target
Wants=mosquitto.service

[Service]
Type=simple
WorkingDirectory=/etc/hyperion
ExecStart=/etc/hyperion/hypBridge -c config/bridgeConfig.yaml
Restart=always
RestartSec=5s
WatchdogSec=120s

[Install]
WantedBy=multi-user.target

// Source for the executable //
#include <iostream>

int main()
{
	std::cout << "Hello World!" << std::endl;
	return 0;
}