1 files changed, 65 insertions, 0 deletions
diff --git a/vendor/gix/src/repository/shallow.rs b/vendor/gix/src/repository/shallow.rs
new file mode 100644
index 000000000..7fac83a55
--- /dev/null
+++ b/vendor/gix/src/repository/shallow.rs
@@ -0,0 +1,65 @@
+use std::{borrow::Cow, path::PathBuf};
+
+use crate::{
+    bstr::ByteSlice,
+    config::tree::{gitoxide, Key},
+    Repository,
+};
+
+impl Repository {
+    /// Return `true` if the repository is a shallow clone, i.e. contains history only up to a certain depth.
+    pub fn is_shallow(&self) -> bool {
+        self.shallow_file()
+            .metadata()
+            .map_or(false, |m| m.is_file() && m.len() > 0)
+    }
+
+    /// Return a shared list of shallow commits which is updated automatically if the in-memory snapshot has become stale
+    /// as the underlying file on disk has changed.
+    ///
+    /// The list of shallow commits represents the shallow boundary, beyond which we are lacking all (parent) commits.
+    /// Note that the list is never empty, as `Ok(None)` is returned in that case indicating the repository
+    /// isn't a shallow clone.
+    ///
+    /// The shared list is shared across all clones of this repository.
+    pub fn shallow_commits(&self) -> Result<Option<crate::shallow::Commits>, crate::shallow::open::Error> {
+        self.shallow_commits.recent_snapshot(
+            || self.shallow_file().metadata().ok().and_then(|m| m.modified().ok()),
+            || {
+                let buf = match std::fs::read(self.shallow_file()) {
+                    Ok(buf) => buf,
+                    Err(err) if err.kind() == std::io::ErrorKind::NotFound => return Ok(None),
+                    Err(err) => return Err(err.into()),
+                };
+
+                let mut commits = buf
+                    .lines()
+                    .map(gix_hash::ObjectId::from_hex)
+                    .collect::<Result<Vec<_>, _>>()?;
+
+                commits.sort();
+                if commits.is_empty() {
+                    Ok(None)
+                } else {
+                    Ok(Some(commits))
+                }
+            },
+        )
+    }
+
+    /// Return the path to the `shallow` file which contains hashes, one per line, that describe commits that don't have their
+    /// parents within this repository.
+    ///
+    /// Note that it may not exist if the repository isn't actually shallow.
+    pub fn shallow_file(&self) -> PathBuf {
+        let shallow_name = self
+            .config
+            .resolved
+            .string_filter_by_key(
+                gitoxide::Core::SHALLOW_FILE.logical_name().as_str(),
+                &mut self.filter_config_section(),
+            )
+            .unwrap_or_else(|| Cow::Borrowed("shallow".into()));
+        self.common_dir().join(gix_path::from_bstr(shallow_name))
+    }
+}