build-wheel sets _PYTHON_HOST_PLATFORM with incorrect format

[hongpingwei]

/root/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/bin/rustc --crate-name cryptography_rust --edition=2021 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --diagnostic-width=233 --crate-type cdylib --emit=dep-info,link -C opt-level=3 -C embed-bitcode=no -C overflow-checks=on --cfg 'feature="default"' --cfg 'feature="extension-module"' -C metadata=6a2eca71f96f7f26 --out-dir /root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps -C strip=debuginfo -L dependency=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps --extern asn1=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps/libasn1-3cbd8c400f93aebb.rlib --extern cfg_if=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps/libcfg_if-aaad75c953799a78.rlib --extern cryptography_cffi=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps/libcryptography_cffi-f6d1f53d4b4eba67.rlib --extern cryptography_key_parsing=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps/libcryptography_key_parsing-bf3a06dc4569f3b6.rlib --extern cryptography_openssl=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps/libcryptography_openssl-7ea2495f600dab58.rlib --extern cryptography_x509=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps/libcryptography_x509-dcfd9e64a59670f0.rlib --extern cryptography_x509_verification=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps/libcryptography_x509_verification-b4fcd3ced752b1c7.rlib --extern foreign_types_shared=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps/libforeign_types_shared-b4c802ac253d35ff.rlib --extern once_cell=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps/libonce_cell-92ab50a58aad97d5.rlib --extern openssl=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps/libopenssl-a842c4610fd1f319.rlib --extern openssl_sys=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps/libopenssl_sys-194f651fc41ddae3.rlib --extern pem=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps/libpem-c4abfd424caba6e8.rlib --extern pyo3=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps/libpyo3-8f6b6dac58ebb9e5.rlib --extern self_cell=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/deps/libself_cell-a6952d443b37ada8.rlib -L native=/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/src/src/rust/target/release/build/cryptography-cffi-7a83c08114839c33/out -L native=/usr/local/openssl/lib --cfg 'CRYPTOGRAPHY_OSSLCONF="OPENSSL_NO_SSL3_METHOD"'`
warning: unused import: `crate::error::CryptographyResult`
 --> src/lib.rs:7:5
  |
7 | use crate::error::CryptographyResult;
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

warning: unused import: `std::env`
  --> src/lib.rs:10:5
   |
10 | use std::env;
   |     ^^^^^^^^

warning: unused variable: `cipher_name`
   --> src/backend/aead.rs:548:13
    |
548 |         let cipher_name = match key.as_bytes().len() {
    |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_cipher_name`
    |
    = note: `#[warn(unused_variables)]` on by default

warning: `cryptography-rust` (lib) generated 3 warnings (run `cargo fix --lib -p cryptography-rust` to apply 3 suggestions)
    Finished release [optimized] target(s) in 35.28s
Traceback (most recent call last):
  File "/root/miniconda3/envs/build-wheel/lib/python3.10/site-packages/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
    main()
  File "/root/miniconda3/envs/build-wheel/lib/python3.10/site-packages/pyproject_hooks/_in_process/_in_process.py", line 335, in main
    json_out['return_val'] = hook(**hook_input['kwargs'])
  File "/root/miniconda3/envs/build-wheel/lib/python3.10/site-packages/pyproject_hooks/_in_process/_in_process.py", line 251, in build_wheel
    return _build_backend().build_wheel(wheel_directory, config_settings,
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/build_meta.py", line 410, in build_wheel
    return self._build_with_temp_dir(
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/build_meta.py", line 395, in _build_with_temp_dir
    self.run_setup()
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/build_meta.py", line 311, in run_setup
    exec(code, locals())
  File "<string>", line 1, in <module>
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/__init__.py", line 104, in setup
    return distutils.core.setup(**attrs)
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/_distutils/core.py", line 184, in setup
    return run_commands(dist)
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/_distutils/core.py", line 200, in run_commands
    dist.run_commands()
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/_distutils/dist.py", line 969, in run_commands
    self.run_command(cmd)
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/dist.py", line 967, in run_command
    super().run_command(command)
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/_distutils/dist.py", line 988, in run_command
    cmd_obj.run()
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/wheel/bdist_wheel.py", line 368, in run
    self.run_command("build")
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/_distutils/cmd.py", line 316, in run_command
    self.distribution.run_command(command)
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/dist.py", line 967, in run_command
    super().run_command(command)
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/_distutils/dist.py", line 988, in run_command
    cmd_obj.run()
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/_distutils/command/build.py", line 132, in run
    self.run_command(cmd_name)
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/_distutils/cmd.py", line 316, in run_command
    self.distribution.run_command(command)
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/dist.py", line 967, in run_command
    super().run_command(command)
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools/_distutils/dist.py", line 988, in run_command
    cmd_obj.run()
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools_rust/setuptools_ext.py", line 160, in run
    super().run()
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools_rust/setuptools_ext.py", line 168, in run
    build_rust.run()
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools_rust/command.py", line 100, in run
    self.run_for_extension(ext)
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools_rust/build.py", line 137, in run_for_extension
    self.install_extension(ext, dylib_paths)
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools_rust/build.py", line 373, in install_extension
    ext_path = self.get_dylib_ext_path(ext, module_name)
  File "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools_rust/build.py", line 460, in get_dylib_ext_path
    host_arch = host_platform.rsplit("-", 1)[1]
IndexError: list index out of range
build-wheel: Error: Backend subprocess exited when trying to invoke build_wheel
(build-wheel) [root@ecs-weichain pypi]# IndexError: list index out of range

[mhsmith]

Sorry, I don't have time to help building Rust-based packages at the moment. But there are some pre-built wheels for Cryptography 39 linked from #657 (comment). I haven't tested these wheels myself, so you should only use them for sensitive work if you trust @emanuele-f.

When creating issues in the future, please provide more context , including:

• What you're trying to achieve
• What command you ran
• The content of the recipe you're using

[vmitro]

Sorry for commenting on a closed issue, but I think I know what's wrong here. The rsplit('-') method in "/root/chaquopy/server/pypi/packages/cryptography/build/42.0.5/cp310-cp310-android_21_arm64_v8a/env/lib/python3.10/site-packages/setuptools_rust/build.py returns the whole string when called on host_platform.

You can use an ugly hack, change the file in question at line 460 to rsplit('_') - that is, underscore instead of a dash. It should work then.

P.S. run the build wheel command with --no-unpack to preserve the change.

[mhsmith]

Thanks very much – this looks like the same problem as #607 (comment): build-wheel's override of _PYTHON_HOST_PLATFORM should use a dash rather than an underscore.

[vmitro]

No problem. Is just changing the way platform string is being composed going to break the existing build scripts?

[mhsmith]

I don't think so, but as I said in the other comment, you might get a clearer answer by finding when the variable was added in the Git history.