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Make pwd module optional for wasm32-emscripten and wasi #91089

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tiran opened this issue Mar 5, 2022 · 3 comments
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Make pwd module optional for wasm32-emscripten and wasi #91089

tiran opened this issue Mar 5, 2022 · 3 comments
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3.11 bug and security fixes stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error

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@tiran
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tiran commented Mar 5, 2022

BPO 46933
Nosy @tiran, @erlend-aasland
PRs
  • bpo-46933: Make pwd module optional (GH-31700) #31700
  • bpo-46933: Fix make distclean regression (GH-31737) #31737
  • Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = 'https://github.com/tiran'
    closed_at = <Date 2022-03-07.12:40:22.912>
    created_at = <Date 2022-03-05.20:50:25.168>
    labels = ['type-bug', 'library', '3.11']
    title = 'Make pwd module optional for wasm32-emscripten and wasi'
    updated_at = <Date 2022-03-07.22:18:58.077>
    user = 'https://github.com/tiran'

    bugs.python.org fields:

    activity = <Date 2022-03-07.22:18:58.077>
    actor = 'christian.heimes'
    assignee = 'christian.heimes'
    closed = True
    closed_date = <Date 2022-03-07.12:40:22.912>
    closer = 'christian.heimes'
    components = ['Library (Lib)']
    creation = <Date 2022-03-05.20:50:25.168>
    creator = 'christian.heimes'
    dependencies = []
    files = []
    hgrepos = []
    issue_num = 46933
    keywords = ['patch']
    message_count = 3.0
    messages = ['414595', '414662', '414704']
    nosy_count = 2.0
    nosy_names = ['christian.heimes', 'erlendaasland']
    pr_nums = ['31700', '31737']
    priority = 'normal'
    resolution = 'fixed'
    stage = 'resolved'
    status = 'closed'
    superseder = None
    type = 'behavior'
    url = 'https://bugs.python.org/issue46933'
    versions = ['Python 3.11']

    @tiran
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    tiran commented Mar 5, 2022

    WebAssembly platforms like wasm32-emscripten and wasm32-wasi don't have a typical user and group database.

    WASI platform does not provide necessary API functions at all. Emscripten provides dummy stubs. On Emscripten the pwd module compiles, but is non-functional:

    Python 3.11.0a4+ (heads/main-dirty:b1a3446, Jan 25 2022, 10:19:07) [Clang 14.0.0 (https://github.com/llvm/llvm-project f142c45f1e494f8dbdcc1bcf1412 on emscripten
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import pwd, os
    >>> os.getuid()
    0
    >>> pwd.getpwall()
    []
    >>> pwd.getpwuid(os.getuid())
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    KeyError: 'getpwuid(): uid not found: 0'

    I propose to make the pwd optional and catch import error in few places where the pwd module is used to look up user home directory.

    @tiran tiran added the 3.11 bug and security fixes label Mar 5, 2022
    @tiran tiran self-assigned this Mar 5, 2022
    @tiran tiran added stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error 3.11 bug and security fixes labels Mar 5, 2022
    @tiran tiran self-assigned this Mar 5, 2022
    @tiran tiran added stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error labels Mar 5, 2022
    @tiran
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    tiran commented Mar 7, 2022

    New changeset ca9689f by Christian Heimes in branch 'main':
    bpo-46933: Make pwd module optional (GH-31700)
    ca9689f

    @tiran tiran closed this as completed Mar 7, 2022
    @tiran tiran closed this as completed Mar 7, 2022
    @tiran
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    tiran commented Mar 7, 2022

    New changeset 47cca04 by Erlend Egeberg Aasland in branch 'main':
    bpo-46933: Fix make distclean regression (GH-31737)
    47cca04

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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