Added test for shallow cloned repo

crates/turborepo-scm/Cargo.toml

@@ -13,4 +13,5 @@ thiserror = { workspace = true }
 turbopath = { workspace = true }
 
 [dev-dependencies]
+git2 = { version = "0.16.1", default-features = false }
 tempfile = { workspace = true }

crates/turborepo-scm/src/git.rs

@@ -144,13 +144,9 @@ mod tests {
 
     use git2::{Oid, Repository};
     use tempfile::TempDir;
-    use turbopath::AbsoluteSystemPathBuf;
 
     use super::previous_content;
-    use crate::{
-        git::{changed_files, reanchor_path_from_git_root_to_turbo_root},
-        Error,
-    };
+    use crate::{git::changed_files, Error};
 
     fn setup_repository() -> Result<(TempDir, Repository), Error> {
         let repo_root = tempfile::tempdir()?;
@@ -208,6 +204,39 @@ mod tests {
         )?)
     }
 
+    #[test]
+    fn test_shallow_clone() -> Result<(), Error> {
+        let tmp_dir = tempfile::tempdir()?;
+        let output = Command::new("git")
+            .args(&[
+                "clone",
+                "--depth",
+                "2",
+                "https://github.com/vercel/app-playground.git",
+                tmp_dir.path().to_str().unwrap(),
+            ])
+            .output()?;
+        assert!(output.status.success());
+
+        assert!(changed_files(
+            tmp_dir.path().to_owned(),
+            tmp_dir.path().to_owned(),
+            Some("HEAD~1"),
+            "HEAD",
+        )
+        .is_ok());
+
+        assert!(changed_files(
+            tmp_dir.path().to_owned(),
+            tmp_dir.path().to_owned(),
+            None,
+            "HEAD",
+        )
+        .is_ok());
+
+        Ok(())
+    }
+
     #[test]
     fn test_deleted_files() -> Result<(), Error> {
         let (repo_root, repo) = setup_repository()?;

crates/turborepo-scm/src/lib.rs

@@ -5,6 +5,8 @@ pub mod git;
 
 #[derive(Debug, Error)]
 pub enum Error {
+    #[error("git error: {0}")]
+    Git(#[from] git2::Error),
     #[error("repository not found")]
     RepositoryNotFound,
     #[error("io error: {0}")]