Fix std::fs::copy on WASI target #69106
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r? @KodrAus (rust_highfive has picked a reviewer for you, use r? to override) |
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Previously `std::fs::copy` on wasm32-wasi would reuse code from the `sys_common` module and would successfully copy contents of the file just to fail right before closing it. This was happening because `sys_common::copy` tries to copy permissions of the file, but permissions are not a thing in WASI (at least yet) and `set_permissions` is implemented as an unconditional runtime error. This change instead adds a custom working implementation of `std::fs::copy` (like Rust already has on some other targets) that doesn't try to call `set_permissions` and is essentially a thin wrapper around `std::io::copy`. Fixes rust-lang#68560.
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I wanted to verify that this actually compiles as expected, since CI doesn't seem to try to do that on a PR; now verified and should be good to go (well, at least ready for review 😊). |
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@bors r+ |
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📌 Commit 8fb8bb4 has been approved by |
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Fix std::fs::copy on WASI target Previously `std::fs::copy` on wasm32-wasi would reuse code from the `sys_common` module and would successfully copy contents of the file just to fail right before closing it. This was happening because `sys_common::copy` tries to copy permissions of the file, but permissions are not a thing in WASI (at least yet) and `set_permissions` is implemented as an unconditional runtime error. This change instead adds a custom working implementation of `std::fs::copy` (like Rust already has on some other targets) that doesn't try to call `set_permissions` and is essentially a thin wrapper around `std::io::copy`. Fixes rust-lang#68560.
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Rollup of 6 pull requests Successful merges: - #64069 (Added From<Vec<NonZeroU8>> for CString) - #66721 (implement LowerExp and UpperExp for integers) - #69106 (Fix std::fs::copy on WASI target) - #69154 (Avoid calling `fn_sig` on closures) - #69166 (Check `has_typeck_tables` before calling `typeck_tables_of`) - #69180 (Suggest a comma if a struct initializer field fails to parse) Failed merges: r? @ghost
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Thanks @KodrAus! |
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Previously
std::fs::copyon wasm32-wasi would reuse code from thesys_commonmodule and would successfully copy contents of the file just to fail right before closing it.This was happening because
sys_common::copytries to copy permissions of the file, but permissions are not a thing in WASI (at least yet) andset_permissionsis implemented as an unconditional runtime error.This change instead adds a custom working implementation of
std::fs::copy(like Rust already has on some other targets) that doesn't try to callset_permissionsand is essentially a thin wrapper aroundstd::io::copy.Fixes #68560.