Dropping libdbus (dbus-python) support

[fohrloop]

I'm in the midst of writing wakepy 1.0.0 release, and with the goal of giving user possibility to select the used method. Currently, on linux there are options: dbus (with jeepney), libdbus (uses dbus-python) and systemd (requires sudo).

I just finished writing the dbus version with jeepney and got tests working. Tests will run in isolated containers using virtual environments, and for that I would need to install dbus-python. Running pip install dbus-python will fail:

pip install dbus-python output

pip install dbus-python output

(Running on Ubuntu 22.04)

(venv) $ python -m pip install dbus-python
Collecting dbus-python
  Using cached dbus-python-1.3.2.tar.gz (605 kB)
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Preparing metadata (pyproject.toml) ... error
  error: subprocess-exited-with-error
  
  × Preparing metadata (pyproject.toml) did not run successfully.
  │ exit code: 1
  ╰─> [95 lines of output]
      The Meson build system
      Version: 1.1.0
      Source dir: /tmp/pip-install-lj8uqzl6/dbus-python_b3d7f4686fd5485495fb1661fcae60af
      Build dir: /tmp/pip-install-lj8uqzl6/dbus-python_b3d7f4686fd5485495fb1661fcae60af/.mesonpy-aiwb5keg/build
      Build type: native build
      Project name: dbus-python
      Project version: 1.3.2
      C compiler for the host machine: cc (gcc 11.3.0 "cc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0")
      C linker for the host machine: cc ld.bfd 2.38
      Host machine cpu family: x86_64
      Host machine cpu: x86_64
      Compiler for C supports arguments -fno-common: YES
      Compiler for C supports arguments -Wno-missing-field-initializers: YES
      Compiler for C supports arguments -Wno-declaration-after-statement: YES
      Compiler for C supports arguments -Wno-inline: YES
      Compiler for C supports arguments -Wno-redundant-decls: YES
      Compiler for C supports arguments -Wno-switch-default: YES
      Compiler for C supports arguments -Wno-write-strings: YES
      Compiler for C supports arguments -Wcast-align: YES
      Compiler for C supports arguments -Wdouble-promotion: YES
      Compiler for C supports arguments -Wduplicated-cond: YES
      Compiler for C supports arguments -Wfloat-equal: YES
      Compiler for C supports arguments -Wformat-nonliteral: YES
      Compiler for C supports arguments -Wformat-security: YES
      Compiler for C supports arguments -Wformat=2: YES
      Compiler for C supports arguments -Winit-self: YES
      Compiler for C supports arguments -Wlogical-op: YES
      Compiler for C supports arguments -Wmissing-declarations: YES
      Compiler for C supports arguments -Wmissing-format-attribute: YES
      Compiler for C supports arguments -Wmissing-include-dirs: YES
      Compiler for C supports arguments -Wmissing-noreturn: YES
      Compiler for C supports arguments -Wnull-dereference: YES
      Compiler for C supports arguments -Wpacked: YES
      Compiler for C supports arguments -Wpointer-arith: YES
      Compiler for C supports arguments -Wshadow: YES
      Compiler for C supports arguments -Wswitch-enum: YES
      Compiler for C supports arguments -Wundef: YES
      Compiler for C supports arguments -Wunused-but-set-variable: YES
      Compiler for C supports arguments -Wjump-misses-init: YES
      Compiler for C supports arguments -Wmissing-prototypes: YES
      Compiler for C supports arguments -Wnested-externs: YES
      Compiler for C supports arguments -Wold-style-definition: YES
      Compiler for C supports arguments -Wpointer-sign: YES
      Compiler for C supports arguments -Wstrict-prototypes: YES
      Configuring _dbus-python-config.h using configuration
      
      Executing subproject dbus-gmain
      
      dbus-gmain| Project name: dbus-gmain
      dbus-gmain| Project version: undefined
      dbus-gmain| C compiler for the host machine: cc (gcc 11.3.0 "cc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0")
      dbus-gmain| C linker for the host machine: cc ld.bfd 2.38
      dbus-gmain| Compiler for C supports arguments -fno-common: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wno-missing-field-initializers: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wcast-align: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wdouble-promotion: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wduplicated-branches: YES
      dbus-gmain| Compiler for C supports arguments -Wduplicated-cond: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wfloat-equal: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wformat-nonliteral: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wformat-security: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wformat=2: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Winit-self: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wlogical-op: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wmissing-declarations: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wmissing-format-attribute: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wmissing-include-dirs: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wmissing-noreturn: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wnull-dereference: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wpacked: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wpointer-arith: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wredundant-decls: YES
      dbus-gmain| Compiler for C supports arguments -Wshadow: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wswitch-default: YES
      dbus-gmain| Compiler for C supports arguments -Wswitch-enum: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wundef: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wunused-but-set-variable: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wwrite-strings: YES
      dbus-gmain| Compiler for C supports arguments -Wdeclaration-after-statement: YES
      dbus-gmain| Compiler for C supports arguments -Wjump-misses-init: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wmissing-prototypes: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wnested-externs: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wold-style-definition: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wpointer-sign: YES (cached)
      dbus-gmain| Compiler for C supports arguments -Wstrict-prototypes: YES (cached)
      dbus-gmain| Did not find pkg-config by name 'pkg-config'
      dbus-gmain| Found Pkg-config: NO
      dbus-gmain| Did not find CMake 'cmake'
      dbus-gmain| Found CMake: NO
      dbus-gmain| Run-time dependency dbus-1 found: NO
      
      ../../subprojects/dbus-gmain/meson.build:107:11: ERROR: Dependency lookup for dbus-1 with method 'pkgconfig' failed: Pkg-config binary for machine 1 not found. Giving up.
      
      A full log can be found at /tmp/pip-install-lj8uqzl6/dbus-python_b3d7f4686fd5485495fb1661fcae60af/.mesonpy-aiwb5keg/build/meson-logs/meson-log.txt
      + meson setup --prefix=/usr /tmp/pip-install-lj8uqzl6/dbus-python_b3d7f4686fd5485495fb1661fcae60af /tmp/pip-install-lj8uqzl6/dbus-python_b3d7f4686fd5485495fb1661fcae60af/.mesonpy-aiwb5keg/build --native-file=/tmp/pip-install-lj8uqzl6/dbus-python_b3d7f4686fd5485495fb1661fcae60af/.mesonpy-native-file.ini -Ddebug=false -Doptimization=2
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.

I assume that the installation process is a bit more complicated than that. It says it is missing "dbus-1". Unfortunately the pypi.org page and dbus-python docs do not have installation instructions. This is slightly unmotivating. In addition the docs say: "..it uses libdbus (which has known problems with multi-threaded use)" (not sure if that will cause problems, or not).

The only real motivation for using dbus-python + libdbus would be that it is in many times installed on the system by default ( like on my Ubuntu machine ), so users would not need jeepney, but if I'm not mistaken also jeepney is included in many distributions. The functionality should be pretty much same, and wakepy only uses a tiny subset of that.

In the 1.0.0 release, I'm planning to have the "jeepney" method with name "dbus", and dropping the dbus-python + libdbus version. I'm still open for discussion about taking dbus-python + libdbus as supported alternative. Happy to hear any thoughts on this.

[fohrloop]

I think this might be the installation instructions for dbus-python

• Download https://dbus.freedesktop.org/releases/dbus-python/dbus-python-1.3.2.tar.gz
• Run

pip3 wheel -w dist --no-build-isolation --no-deps $PWD
pip3 install --no-index --find-links dist --no-cache-dir --no-user dbus-python

From: linuxfromscratch.org

[fohrloop]

Even if I'll get the installation working easily, this needs a bit of thinking. I think the correct place for that thinking process is #33