[red-knot]: Add a VendoredFileSystem implementation

crates/ruff_db/Cargo.toml

@@ -20,6 +20,11 @@ camino = { workspace = true }
 countme = { workspace = true }
 dashmap = { workspace = true }
 filetime = { workspace = true }
+itertools = { workspace = true }
 salsa = { workspace = true }
 tracing = { workspace = true }
 rustc-hash = { workspace = true }
+zip = { workspace = true }
+
+[dev-dependencies]
+once_cell = { workspace = true }

crates/ruff_db/src/file_system.rs

@@ -3,8 +3,8 @@ use std::ops::Deref;
 use std::path::{Path, StripPrefixError};
 
 use camino::{Utf8Path, Utf8PathBuf};
-use filetime::FileTime;
 
+use crate::metadata::FileRevision;
 pub use memory::MemoryFileSystem;
 pub use os::OsFileSystem;
 
@@ -514,55 +514,6 @@ impl Metadata {
     }
 }
 
-/// A number representing the revision of a file.
-///
-/// Two revisions that don't compare equal signify that the file has been modified.
-/// Revisions aren't guaranteed to be monotonically increasing or in any specific order.
-///
-/// Possible revisions are:
-/// * The last modification time of the file.
-/// * The hash of the file's content.
-/// * The revision as it comes from an external system, for example the LSP.
-#[derive(Copy, Clone, Debug, Eq, PartialEq)]
-pub struct FileRevision(u128);
-
-impl FileRevision {
-    pub fn new(value: u128) -> Self {
-        Self(value)
-    }
-
-    pub const fn zero() -> Self {
-        Self(0)
-    }
-
-    #[must_use]
-    pub fn as_u128(self) -> u128 {
-        self.0
-    }
-}
-
-impl From<u128> for FileRevision {
-    fn from(value: u128) -> Self {
-        FileRevision(value)
-    }
-}
-
-impl From<u64> for FileRevision {
-    fn from(value: u64) -> Self {
-        FileRevision(u128::from(value))
-    }
-}
-
-impl From<FileTime> for FileRevision {
-    fn from(value: FileTime) -> Self {
-        let seconds = value.seconds() as u128;
-        let seconds = seconds << 64;
-        let nanos = u128::from(value.nanoseconds());
-
-        FileRevision(seconds | nanos)
-    }
-}
-
 #[derive(Copy, Clone, Eq, PartialEq, Debug, Hash)]
 pub enum FileType {
     File,
@@ -583,24 +534,3 @@ impl FileType {
         matches!(self, FileType::Symlink)
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use filetime::FileTime;
-
-    use crate::file_system::FileRevision;
-
-    #[test]
-    fn revision_from_file_time() {
-        let file_time = FileTime::now();
-        let revision = FileRevision::from(file_time);
-
-        let revision = revision.as_u128();
-
-        let nano = revision & 0xFFFF_FFFF_FFFF_FFFF;
-        let seconds = revision >> 64;
-
-        assert_eq!(file_time.nanoseconds(), nano as u32);
-        assert_eq!(file_time.seconds(), seconds as i64);
-    }
-}

crates/ruff_db/src/lib.rs

@@ -9,8 +9,10 @@ use crate::source::{line_index, source_text};
 use crate::vfs::{Vfs, VfsFile};
 
 pub mod file_system;
+mod metadata;
 pub mod parsed;
 pub mod source;
+pub mod vendored;
 pub mod vfs;
 
 pub(crate) type FxDashMap<K, V> = dashmap::DashMap<K, V, BuildHasherDefault<FxHasher>>;

crates/ruff_db/src/metadata.rs

@@ -0,0 +1,69 @@
+/// A number representing the revision of a file.
+///
+/// Two revisions that don't compare equal signify that the file has been modified.
+/// Revisions aren't guaranteed to be monotonically increasing or in any specific order.
+///
+/// Possible revisions are:
+/// * The last modification time of the file.
+/// * The hash of the file's content.
+/// * The revision as it comes from an external system, for example the LSP.
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub struct FileRevision(u128);
+
+impl FileRevision {
+    pub fn new(value: u128) -> Self {
+        Self(value)
+    }
+
+    pub const fn zero() -> Self {
+        Self(0)
+    }
+
+    #[must_use]
+    pub fn as_u128(self) -> u128 {
+        self.0
+    }
+}
+
+impl From<u128> for FileRevision {
+    fn from(value: u128) -> Self {
+        FileRevision(value)
+    }
+}
+
+impl From<u64> for FileRevision {
+    fn from(value: u64) -> Self {
+        FileRevision(u128::from(value))
+    }
+}
+
+impl From<filetime::FileTime> for FileRevision {
+    fn from(value: filetime::FileTime) -> Self {
+        let seconds = value.seconds() as u128;
+        let seconds = seconds << 64;
+        let nanos = u128::from(value.nanoseconds());
+
+        FileRevision(seconds | nanos)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use filetime::FileTime;
+
+    use super::*;
+
+    #[test]
+    fn revision_from_file_time() {
+        let file_time = FileTime::now();
+        let revision = FileRevision::from(file_time);
+
+        let revision = revision.as_u128();
+
+        let nano = revision & 0xFFFF_FFFF_FFFF_FFFF;
+        let seconds = revision >> 64;
+
+        assert_eq!(file_time.nanoseconds(), nano as u32);
+        assert_eq!(file_time.seconds(), seconds as i64);
+    }
+}

crates/ruff_db/src/parsed.rs

@@ -69,7 +69,7 @@ mod tests {
     use crate::file_system::FileSystemPath;
     use crate::parsed::parsed_module;
     use crate::tests::TestDb;
-    use crate::vfs::VendoredPath;
+    use crate::vendored::VendoredPath;
     use crate::vfs::{system_path_to_file, vendored_path_to_file};
 
     #[test]