please add support for fuse 3

[custom82]

No description provided.

[smessmer]

Hi, thanks for reaching out. Are there platforms that don't support fuse2 anymore? Afaik, all current platforms support fuse2 and some support fuse3, so using fuse2 should be the most compatible.

[tnmils]

Hi,
i'm using KDEneon and it seems that support for fuse2 is dropped.The default is fuse3, and when trying to install back fuse it requires to remove plasma desktop and other essential packages: it surely means breaking the system.So now i'm stuck with fuse3 that i cannot use with any program.

`:~/cryfs/build$ PKG_CONFIG_PATH=/bin/fusermount3 cmake ..
CMake Deprecation Warning at CMakeLists.txt:4 (cmake_policy):
The OLD behavior for policy CMP0065 will be removed from a future version
of CMake.

The cmake-policies(7) manual explains that the OLD behaviors of all
policies are deprecated and that a policy should be set to OLD only under
specific short-term circumstances. Projects should be ported to the NEW
behavior and not rely on setting a policy to OLD.

-- Conan: checking conan executable
-- Conan: Found program /usr/local/bin/conan
-- Conan: Version found Conan version 1.48.1

-- Conan executing: /usr/local/bin/conan install /home/sc/cryfs/conanfile.py --build missing --settings build_type=RelWithDebInfo --settings compiler=gcc --settings compiler.version=9 --settings compiler.libcxx=libstdc++11
Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=RelWithDebInfo
compiler=gcc
compiler.libcxx=libstdc++11
compiler.version=9
os=Linux
os_build=Linux
[options]
[build_requires]
[env]

conanfile.py: Installing package
Requirements
boost/1.75.0 from 'conancenter' - Cache
fmt/7.1.3 from 'conancenter' - Cache
range-v3/0.11.0 from 'conancenter' - Cache
spdlog/1.8.5 from 'conancenter' - Cache
Packages
boost/1.75.0:ab131a35903c9deb16b92403a53cdb2662fe82fe - Cache
fmt/7.1.3:c0b6e263da7675aec620fd075210c48988506d73 - Cache
range-v3/0.11.0:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Cache
spdlog/1.8.5:2ac168a5a469cd6a81f11e00cf2589ff4bcb2ed0 - Cache

Installing (downloading, building) binaries...
boost/1.75.0: Already installed!
fmt/7.1.3: Already installed!
range-v3/0.11.0: Already installed!
spdlog/1.8.5: Already installed!
conanfile.py: Generator cmake created conanbuildinfo.cmake
conanfile.py: Generator txt created conanbuildinfo.txt
conanfile.py: Aggregating env generators
conanfile.py: Generated conaninfo.txt
conanfile.py: Generated graphinfo
-- Conan: Using cmake targets configuration
-- Library spdlog found /home/sc/.conan/data/spdlog/1.8.5///package/2ac168a5a469cd6a81f11e00cf2589ff4bcb2ed0/lib/libspdlog.a
-- Library boost_filesystem found /home/sc/.conan/data/boost/1.75.0///package/ab131a35903c9deb16b92403a53cdb2662fe82fe/lib/libboost_filesystem.a
-- Library boost_program_options found /home/sc/.conan/data/boost/1.75.0///package/ab131a35903c9deb16b92403a53cdb2662fe82fe/lib/libboost_program_options.a
-- Library boost_thread found /home/sc/.conan/data/boost/1.75.0///package/ab131a35903c9deb16b92403a53cdb2662fe82fe/lib/libboost_thread.a
-- Library boost_atomic found /home/sc/.conan/data/boost/1.75.0///package/ab131a35903c9deb16b92403a53cdb2662fe82fe/lib/libboost_atomic.a
-- Library boost_chrono found /home/sc/.conan/data/boost/1.75.0///package/ab131a35903c9deb16b92403a53cdb2662fe82fe/lib/libboost_chrono.a
-- Library boost_container found /home/sc/.conan/data/boost/1.75.0///package/ab131a35903c9deb16b92403a53cdb2662fe82fe/lib/libboost_container.a
-- Library boost_date_time found /home/sc/.conan/data/boost/1.75.0///package/ab131a35903c9deb16b92403a53cdb2662fe82fe/lib/libboost_date_time.a
-- Library boost_exception found /home/sc/.conan/data/boost/1.75.0///package/ab131a35903c9deb16b92403a53cdb2662fe82fe/lib/libboost_exception.a
-- Library boost_wserialization found /home/sc/.conan/data/boost/1.75.0///package/ab131a35903c9deb16b92403a53cdb2662fe82fe/lib/libboost_wserialization.a
-- Library boost_serialization found /home/sc/.conan/data/boost/1.75.0///package/ab131a35903c9deb16b92403a53cdb2662fe82fe/lib/libboost_serialization.a
-- Library fmt found /home/sc/.conan/data/fmt/7.1.3///package/c0b6e263da7675aec620fd075210c48988506d73/lib/libfmt.a
-- Conan: Adjusting default RPATHs Conan policies
-- Current conanbuildinfo.cmake directory: /home/sc/cryfs/build
-- Conan: Compiler GCC>=5, checking major version 9
-- Conan: Checking correct version: 9
-- *************************************************************************
The Crypto++ library does not officially support CMake. CMake support is a
community effort, and the library works with the folks using CMake to help
improve it. If you find an issue then please fix it or report it at
https://github.com/noloader/cryptopp-cmake.
-- *************************************************************************
-- CMake version 3.22.1
-- System Linux
-- Processor x86_64
CMake Deprecation Warning at vendor/cryptopp/vendor_cryptopp/CMakeLists.txt:34 (cmake_minimum_required):
Compatibility with CMake < 2.8.12 will be removed from a future version of
CMake.

Update the VERSION argument value or use a ... suffix to tell
CMake that the project does not need compatibility with older versions.

-- Performing Test CRYPTOPP_IA32_SSE2
-- Performing Test CRYPTOPP_IA32_SSE2 - Success
-- Performing Test CRYPTOPP_IA32_SSSE3
-- Performing Test CRYPTOPP_IA32_SSSE3 - Success
-- Performing Test CRYPTOPP_IA32_SSE41
-- Performing Test CRYPTOPP_IA32_SSE41 - Success
-- Performing Test CRYPTOPP_IA32_SSE42
-- Performing Test CRYPTOPP_IA32_SSE42 - Success
-- Performing Test CRYPTOPP_IA32_CLMUL
-- Performing Test CRYPTOPP_IA32_CLMUL - Success
-- Performing Test CRYPTOPP_IA32_AES
-- Performing Test CRYPTOPP_IA32_AES - Success
-- Performing Test CRYPTOPP_IA32_AVX
-- Performing Test CRYPTOPP_IA32_AVX - Success
-- Performing Test CRYPTOPP_IA32_AVX2
-- Performing Test CRYPTOPP_IA32_AVX2 - Success
-- Performing Test CRYPTOPP_IA32_SHA
-- Performing Test CRYPTOPP_IA32_SHA - Success
-- Performing Test CRYPTOPP_MIXED_ASM
-- Performing Test CRYPTOPP_MIXED_ASM - Success
-- OpenMP: Found libomp without any special flags
-- Platform: x86_64
-- Compiler: /usr/bin/c++
-- Compiler options:
-- Compiler definitions:
-- Build type: RelWithDebInfo
-- Building version 0.11.0+22.g31c831f9
-- addr2line found. Using it for backtraces.
-- Checking for module 'fuse'
-- No package 'fuse' found
CMake Error at /usr/share/cmake-3.22/Modules/FindPkgConfig.cmake:603 (message):
A required package was not found
Call Stack (most recent call first):
/usr/share/cmake-3.22/Modules/FindPkgConfig.cmake:825 (_pkg_check_modules_internal)
src/fspp/fuse/CMakeLists.txt:40 (pkg_check_modules)

-- Configuring incomplete, errors occurred!
`

[smessmer]

I tried to upgrade CryFS to libfuse3 but both MacFuse and Dokany don't support fuse3 yet. That means a fuse3 CryFS would not run on MacOS or Windows.

• MacFuse issue: libfuse >=3.1.0? osxfuse/osxfuse#390
• DokanY issue: Fuse3 support dokan-dev/dokany#1167

Mac and Windows support is important. I'll migrate CryFS to fuse3 once both the Mac and Windows fuse libraries support it.