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Windows implementation of fs::try_exists
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@ -173,6 +173,7 @@ fn clone(&self) -> Self {
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pub const ERROR_NOT_ENOUGH_MEMORY: DWORD = 8;
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pub const ERROR_OUTOFMEMORY: DWORD = 14;
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pub const ERROR_NO_MORE_FILES: DWORD = 18;
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pub const ERROR_SHARING_VIOLATION: u32 = 32;
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pub const ERROR_HANDLE_EOF: DWORD = 38;
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pub const ERROR_FILE_EXISTS: DWORD = 80;
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pub const ERROR_INVALID_PARAMETER: DWORD = 87;
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@ -11,7 +11,6 @@
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use crate::sys::handle::Handle;
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use crate::sys::time::SystemTime;
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use crate::sys::{c, cvt};
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pub use crate::sys_common::fs::try_exists;
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use crate::sys_common::FromInner;
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use super::to_u16s;
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@ -945,3 +944,32 @@ fn symlink_junction_inner(original: &Path, junction: &Path) -> io::Result<()> {
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.map(drop)
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}
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}
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// Try to see if a file exists but, unlike `exists`, report I/O errors.
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pub fn try_exists(path: &Path) -> io::Result<bool> {
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// Open the file to ensure any symlinks are followed to their target.
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let mut opts = OpenOptions::new();
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// No read, write, etc access rights are needed.
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opts.access_mode(0);
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// Backup semantics enables opening directories as well as files.
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opts.custom_flags(c::FILE_FLAG_BACKUP_SEMANTICS);
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match File::open(path, &opts) {
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Err(e) => match e.kind() {
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// The file definitely does not exist
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io::ErrorKind::NotFound => Ok(false),
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// `ERROR_SHARING_VIOLATION` means that the file has been locked by
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// another process. This is often temporary so we simply report it
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// as the file existing.
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io::ErrorKind::Other if e.raw_os_error() == Some(c::ERROR_SHARING_VIOLATION as i32) => {
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Ok(true)
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}
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// Other errors such as `ERROR_ACCESS_DENIED` may indicate that the
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// file exists. However, these types of errors are usually more
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// permanent so we report them here.
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_ => Err(e),
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},
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// The file was opened successfully therefore it must exist,
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Ok(_) => Ok(true),
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}
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}
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