breaking: Remove the pre-exec extension function
The purpose for removing this function is twofold: - It is the only unsafe code in this crate that can't be realistically replaced with safe code. - It is a footgun anyways, and can be done anyways with Into::into() if users really want it. This is a breaking change. Signed-off-by: John Nunley <dev@notgull.net>
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41
src/unix.rs
41
src/unix.rs
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@ -20,39 +20,6 @@ pub trait CommandExt: crate::sealed::Sealed {
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/// the same semantics as the `uid` field.
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/// the same semantics as the `uid` field.
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fn gid(&mut self, id: u32) -> &mut Command;
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fn gid(&mut self, id: u32) -> &mut Command;
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/// Schedules a closure to be run just before the `exec` function is
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/// invoked.
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///
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/// The closure is allowed to return an I/O error whose OS error code will
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/// be communicated back to the parent and returned as an error from when
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/// the spawn was requested.
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///
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/// Multiple closures can be registered and they will be called in order of
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/// their registration. If a closure returns `Err` then no further closures
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/// will be called and the spawn operation will immediately return with a
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/// failure.
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///
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/// # Safety
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///
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/// This closure will be run in the context of the child process after a
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/// `fork`. This primarily means that any modifications made to memory on
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/// behalf of this closure will **not** be visible to the parent process.
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/// This is often a very constrained environment where normal operations
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/// like `malloc` or acquiring a mutex are not guaranteed to work (due to
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/// other threads perhaps still running when the `fork` was run).
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///
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/// This also means that all resources such as file descriptors and
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/// memory-mapped regions got duplicated. It is your responsibility to make
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/// sure that the closure does not violate library invariants by making
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/// invalid use of these duplicates.
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///
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/// When this closure is run, aspects such as the stdio file descriptors and
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/// working directory have successfully been changed, so output to these
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/// locations may not appear where intended.
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unsafe fn pre_exec<F>(&mut self, f: F) -> &mut Command
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where
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F: FnMut() -> io::Result<()> + Send + Sync + 'static;
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/// Performs all the required setup by this `Command`, followed by calling
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/// Performs all the required setup by this `Command`, followed by calling
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/// the `execvp` syscall.
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/// the `execvp` syscall.
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///
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///
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@ -103,14 +70,6 @@ impl CommandExt for Command {
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self
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self
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}
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}
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unsafe fn pre_exec<F>(&mut self, f: F) -> &mut Command
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where
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F: FnMut() -> io::Result<()> + Send + Sync + 'static,
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{
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self.inner.pre_exec(f);
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self
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}
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fn exec(&mut self) -> io::Error {
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fn exec(&mut self) -> io::Error {
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self.inner.exec()
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self.inner.exec()
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}
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}
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