From d0843dffe41438d0286396bf213840ced140ccca Mon Sep 17 00:00:00 2001
From: Christian Duerr <chris.durr@phylum.io>
Date: Mon, 16 Oct 2023 23:47:35 +0200
Subject: [PATCH] Add test for broken symlinks

---
 Cargo.toml                 |  5 +++++
 tests/fs_broken_symlink.rs | 30 ++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 tests/fs_broken_symlink.rs

diff --git a/Cargo.toml b/Cargo.toml
index 7cd500e..0b07bf6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -49,6 +49,11 @@ name = "fs_symlink_dir"
 path = "tests/fs_symlink_dir.rs"
 harness = false
 
+[[test]]
+name = "fs_broken_symlink"
+path = "tests/fs_broken_symlink.rs"
+harness = false
+
 [[test]]
 name = "fs_null"
 path = "tests/fs_null.rs"
diff --git a/tests/fs_broken_symlink.rs b/tests/fs_broken_symlink.rs
new file mode 100644
index 0000000..e8d8bce
--- /dev/null
+++ b/tests/fs_broken_symlink.rs
@@ -0,0 +1,30 @@
+use std::fs;
+use std::os::unix::fs as unixfs;
+use std::path::PathBuf;
+
+use birdcage::error::Error;
+use birdcage::{Birdcage, Exception, Sandbox};
+use tempfile::NamedTempFile;
+
+fn main() {
+    // Setup a symlink without target.
+    let tempfile = NamedTempFile::new().unwrap();
+    let tempfile_path = tempfile.path().to_path_buf();
+    let symlink_str = tempfile_path.to_string_lossy() + "_tmpfile";
+    let symlink = PathBuf::from(symlink_str.as_ref());
+    unixfs::symlink(&tempfile, &symlink).unwrap();
+    drop(tempfile);
+    assert!(!tempfile_path.exists());
+
+    // Sandbox exception fails with invalid path error.
+    let mut birdcage = Birdcage::new();
+    let result = birdcage.add_exception(Exception::Read(symlink.clone()));
+    assert!(matches!(result, Err(Error::InvalidPath(_))));
+    birdcage.lock().unwrap();
+
+    // Read/Write results in error.
+    let result = fs::read_to_string(&symlink);
+    assert!(result.is_err());
+    let result = fs::write(&symlink, "bob");
+    assert!(result.is_err());
+}