mirror of
https://github.com/BurntSushi/ripgrep.git
synced 2025-05-18 17:20:21 -07:00
bb8601b2ba
Some of the new hyperlink work caused ripgrep to stop compiling
on non-{Unix,Windows} platforms. The most popular of which is WASI.
This commit makes non-{Unix,Windows} compile again. And we add a
very basic WASI test in CI to catch regressions.
More work is needed to make tests on non-{Unix,Windows} platforms
work. And of course, this commit specifically takes the path of disabling
hyperlink support for non-{Unix,Windows} platforms.
86 lines
2.9 KiB
Rust
86 lines
2.9 KiB
Rust
use std::{ffi::OsString, io};
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/// Returns the hostname of the current system.
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///
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/// It is unusual, although technically possible, for this routine to return
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/// an error. It is difficult to list out the error conditions, but one such
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/// possibility is platform support.
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///
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/// # Platform specific behavior
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///
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/// On Windows, this currently uses the "physical DNS hostname" computer name.
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/// This may change in the future.
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///
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/// On Unix, this returns the result of the `gethostname` function from the
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/// `libc` linked into the program.
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pub fn hostname() -> io::Result<OsString> {
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#[cfg(windows)]
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{
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use winapi_util::sysinfo::{get_computer_name, ComputerNameKind};
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get_computer_name(ComputerNameKind::PhysicalDnsHostname)
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}
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#[cfg(unix)]
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{
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gethostname()
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}
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#[cfg(not(any(windows, unix)))]
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{
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Err(io::Error::new(
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io::ErrorKind::Other,
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"hostname could not be found on unsupported platform",
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))
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}
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}
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#[cfg(unix)]
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fn gethostname() -> io::Result<OsString> {
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use std::os::unix::ffi::OsStringExt;
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// SAFETY: There don't appear to be any safety requirements for calling
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// sysconf.
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let limit = unsafe { libc::sysconf(libc::_SC_HOST_NAME_MAX) };
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if limit == -1 {
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// It is in theory possible for sysconf to return -1 for a limit but
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// *not* set errno, in which case, io::Error::last_os_error is
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// indeterminate. But untangling that is super annoying because std
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// doesn't expose any unix-specific APIs for inspecting the errno. (We
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// could do it ourselves, but it just doesn't seem worth doing?)
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return Err(io::Error::last_os_error());
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}
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let Ok(maxlen) = usize::try_from(limit) else {
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let msg = format!("host name max limit ({}) overflowed usize", limit);
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return Err(io::Error::new(io::ErrorKind::Other, msg));
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};
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// maxlen here includes the NUL terminator.
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let mut buf = vec![0; maxlen];
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// SAFETY: The pointer we give is valid as it is derived directly from a
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// Vec. Similarly, `maxlen` is the length of our Vec, and is thus valid
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// to write to.
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let rc = unsafe {
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libc::gethostname(buf.as_mut_ptr().cast::<libc::c_char>(), maxlen)
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};
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if rc == -1 {
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return Err(io::Error::last_os_error());
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}
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// POSIX says that if the hostname is bigger than `maxlen`, then it may
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// write a truncate name back that is not necessarily NUL terminated (wtf,
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// lol). So if we can't find a NUL terminator, then just give up.
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let Some(zeropos) = buf.iter().position(|&b| b == 0) else {
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let msg = "could not find NUL terminator in hostname";
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return Err(io::Error::new(io::ErrorKind::Other, msg));
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};
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buf.truncate(zeropos);
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buf.shrink_to_fit();
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Ok(OsString::from_vec(buf))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn print_hostname() {
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println!("{:?}", hostname().unwrap());
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}
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}
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