Import AppImageLauncherFS into this repo

.gitmodules

@@ -1,9 +1,6 @@
 [submodule "lib/AppImageUpdate"]
 	path = lib/AppImageUpdate
 	url = https://github.com/AppImage/AppImageUpdate.git
-[submodule "lib/AppImageLauncherFS"]
-	path = lib/AppImageLauncherFS
-	url = https://github.com/TheAssassin/AppImageLauncherFS
 [submodule "lib/libappimage"]
 	path = lib/libappimage
 	url = https://github.com/AppImage/libappimage.git

LICENSE.txt

@@ -1,4 +1,4 @@
-Copyright (c) 2018 TheAssassin <theassassin@assassinate-you.net>
+Copyright (c) 2018-2019 TheAssassin <theassassin@assassinate-you.net>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

cmake/install.cmake

@@ -50,3 +50,15 @@ install(
     FILES ${PROJECT_BINARY_DIR}/resources/appimagelauncherd.service
     DESTINATION lib/systemd/user/ COMPONENT APPIMAGELAUNCHER
 )
+
+# install systemd service configuration for appimagelauncherfs
+configure_file(
+    ${PROJECT_SOURCE_DIR}/resources/appimagelauncherfs.service.in
+    ${PROJECT_BINARY_DIR}/resources/appimagelauncherfs.service
+    @ONLY
+)
+# caution: don't use ${CMAKE_INSTALL_LIBDIR} here, it's really just lib/systemd/user
+install(
+    FILES ${PROJECT_BINARY_DIR}/resources/appimagelauncherfs.service
+    DESTINATION lib/systemd/user/ COMPONENT APPIMAGELAUNCHERFS
+)

cmake/modules/FindFUSE.cmake

@@ -0,0 +1,18 @@
+find_path(FUSE_INCLUDE_DIR fuse.h
+    /usr/include
+    /usr/include/x86_64-linux-gnu
+    /usr/include/i386-linux-gnu
+)
+
+find_library(FUSE_LIBRARY fuse)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args("FUSE" DEFAULT_MSG FUSE_INCLUDE_DIR FUSE_LIBRARY)
+
+mark_as_advanced(FUSE_INCLUDE_DIR FUSE_LIBRARY)
+
+message(STATUS "Found FUSE: ${FUSE_LIBRARY} (include dirs: ${FUSE_INCLUDE_DIR})")
+
+add_library(libfuse IMPORTED SHARED)
+set_property(TARGET libfuse PROPERTY INTERFACE_INCLUDE_DIRECTORIES "${FUSE_INCLUDE_DIR}")
+set_property(TARGET libfuse PROPERTY IMPORTED_LOCATION "${FUSE_LIBRARY}")

lib/CMakeLists.txt

@@ -19,10 +19,6 @@ if(ENABLE_UPDATE_HELPER)
     add_subdirectory(AppImageUpdate EXCLUDE_FROM_ALL)
 endif()
 
-if(NOT USE_SYSTEM_APPIMAGELAUNCHERFS)
-    add_subdirectory(AppImageLauncherFS)
-endif()
-
 if(TRAVIS_BUILD)
     # TODO: use latest version of CMake once it contains the following change:
     # https://gitlab.kitware.com/cmake/cmake/commit/00a9d133fb2838ebb756d684659c5d51f577ede3

resources/appimagelauncherfs.service.in

@@ -0,0 +1,10 @@
+[Unit]
+Description=AppImageLauncherFS daemon
+
+[Service]
+ExecStart=@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_BINDIR@/appimagelauncherfs
+Restart=always
+RestartSec=2
+
+[Install]
+WantedBy=wm.target

src/CMakeLists.txt

@@ -42,3 +42,6 @@ add_subdirectory(daemon)
 
 # main application and helper tools
 add_subdirectory(ui)
+
+# FUSE filesystem AppImageLauncherFS
+add_subdirectory(fusefs)

src/fusefs/CMakeLists.txt

@@ -0,0 +1,22 @@
+# use latest FUSE API
+add_definitions(-DFUSE_USE_VERSION=26)
+# required by FUSE
+add_definitions(-D_FILE_OFFSET_BITS=64)
+
+if(NOT TARGET libfuse)
+    find_package(FUSE REQUIRED)
+endif()
+
+set(Boost_USE_STATIC_LIBS ON)
+find_package(Boost REQUIRED COMPONENTS filesystem)
+
+add_executable(appimagelauncherfs main.cpp fs.cpp fs.h error.h)
+target_link_libraries(appimagelauncherfs PUBLIC libfuse Boost::filesystem)
+
+# ISO C++ spawns annoying warnings about string literals
+target_compile_options(appimagelauncherfs PRIVATE -Wno-write-strings)
+
+install(
+    TARGETS appimagelauncherfs COMPONENT APPIMAGELAUNCHERFS
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)

src/fusefs/error.h

@@ -0,0 +1,28 @@
+#pragma once
+
+// system includes
+#include <stdexcept>
+
+// base class
+class AppImageLauncherFSError : public std::runtime_error {
+public:
+    explicit AppImageLauncherFSError(const std::string& msg = "") : runtime_error(msg) {}
+};
+
+class AlreadyRunningError : public AppImageLauncherFSError { using AppImageLauncherFSError::AppImageLauncherFSError; };
+class CouldNotOpenFileError : public AppImageLauncherFSError { using AppImageLauncherFSError::AppImageLauncherFSError; };
+class FileNotFoundError : public AppImageLauncherFSError { using AppImageLauncherFSError::AppImageLauncherFSError; };
+class InvalidPathError : public AppImageLauncherFSError { using AppImageLauncherFSError::AppImageLauncherFSError; };
+
+class AppImageAlreadyRegisteredError : public AppImageLauncherFSError {
+private:
+    int _id;
+
+public:
+    explicit AppImageAlreadyRegisteredError(int id) : _id(id) {};
+
+public:
+    int id() {
+        return _id;
+    }
+};