comparison rust/hg-core/src/vfs.rs @ 50180:be019ac8c1e4 stable

dirstate-v2: don't mmap the data file when on NFS

`mmap` on NFS will trigger a SIGBUS when the mmap'ed file is deleted, which
wouldn't work in our case. Also, the performance advantage of using mmap on
NFS is debatable at best.

50179:f2e13d8d30e0

}

pub(crate) fn is_file(path: impl AsRef<Path>) -> Result<bool, HgError> {
    Ok(fs_metadata(path)?.map_or(false, |meta| meta.is_file()))
}

50180:be019ac8c1e4

}

pub(crate) fn is_file(path: impl AsRef<Path>) -> Result<bool, HgError> {
    Ok(fs_metadata(path)?.map_or(false, |meta| meta.is_file()))
}

/// Returns whether the given `path` is on a network file system.
/// Taken from `cargo`'s codebase.
#[cfg(target_os = "linux")]
pub(crate) fn is_on_nfs_mount(path: impl AsRef<Path>) -> bool {
    use std::ffi::CString;
    use std::mem;
    use std::os::unix::prelude::*;

    let path = match CString::new(path.as_ref().as_os_str().as_bytes()) {
        Ok(path) => path,
        Err(_) => return false,
    };

    unsafe {
        let mut buf: libc::statfs = mem::zeroed();
        let r = libc::statfs(path.as_ptr(), &mut buf);

        r == 0 && buf.f_type as u32 == libc::NFS_SUPER_MAGIC as u32
    }
}