virtual_fs/
empty_fs.rs

1//! When no file system is used by a WebC then this is used as a placeholder -
2//! as the name suggests it always returns file not found.
3
4use std::path::Path;
5#[allow(unused_imports, dead_code)]
6use tracing::{debug, error, info, trace, warn};
7
8use crate::*;
9
10#[derive(Debug, Default)]
11pub struct EmptyFileSystem {}
12
13#[allow(unused_variables)]
14impl FileSystem for EmptyFileSystem {
15    fn readlink(&self, path: &Path) -> Result<PathBuf> {
16        Err(FsError::EntryNotFound)
17    }
18
19    fn read_dir(&self, path: &Path) -> Result<ReadDir> {
20        // Special-case the root path by returning an empty iterator.
21        // An empty file system should still be readable, just not contain
22        // any entries.
23        if path == Path::new("/") {
24            Ok(ReadDir::new(Vec::new()))
25        } else {
26            Err(FsError::EntryNotFound)
27        }
28    }
29
30    fn create_dir(&self, path: &Path) -> Result<()> {
31        Err(FsError::EntryNotFound)
32    }
33
34    fn remove_dir(&self, path: &Path) -> Result<()> {
35        Err(FsError::EntryNotFound)
36    }
37
38    fn rename<'a>(&'a self, from: &'a Path, to: &'a Path) -> BoxFuture<'a, Result<()>> {
39        Box::pin(async { Err(FsError::EntryNotFound) })
40    }
41
42    fn metadata(&self, path: &Path) -> Result<Metadata> {
43        // Special-case the root path by returning an stub value.
44        // An empty file system should still be readable, just not contain
45        // any entries.
46        if path == Path::new("/") {
47            Ok(Metadata {
48                ft: FileType::new_dir(),
49                accessed: 0,
50                created: 0,
51                modified: 0,
52                len: 0,
53            })
54        } else {
55            Err(FsError::EntryNotFound)
56        }
57    }
58
59    fn symlink_metadata(&self, path: &Path) -> Result<Metadata> {
60        Err(FsError::EntryNotFound)
61    }
62
63    fn remove_file(&self, path: &Path) -> Result<()> {
64        Err(FsError::EntryNotFound)
65    }
66
67    fn new_open_options(&self) -> OpenOptions<'_> {
68        OpenOptions::new(self)
69    }
70
71    fn mount(
72        &self,
73        name: String,
74        path: &Path,
75        fs: Box<dyn crate::FileSystem + Send + Sync>,
76    ) -> Result<()> {
77        Err(FsError::Unsupported)
78    }
79}
80
81impl FileOpener for EmptyFileSystem {
82    #[allow(unused_variables)]
83    fn open(
84        &self,
85        path: &Path,
86        conf: &OpenOptionsConfig,
87    ) -> Result<Box<dyn VirtualFile + Send + Sync + 'static>> {
88        Err(FsError::EntryNotFound)
89    }
90}
virtual_fs/empty_fs.rs

virtual_fs/
empty_fs.rs
