safe-path: add more unit test cases

Add more unit test cases to improve code coverage.

Signed-off-by: Liu Jiang <gerry@linux.alibaba.com>

src/libs/safe-path/src/pinned_path_buf.rs

@@ -230,6 +230,7 @@ impl AsRef<Path> for PinnedPathBuf {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use std::ffi::OsString;
     use std::fs::DirBuilder;
     use std::io::Write;
     use std::os::unix::fs::{symlink, MetadataExt};
@@ -396,5 +397,48 @@ mod tests {
         let path = path.open_child(OsStr::new("child")).unwrap();
         let content = fs::read_to_string(&path).unwrap();
         assert_eq!(&content, "test");
+
+        path.open_child(&OsString::from("__does_not_exist__"))
+            .unwrap_err();
+        path.open_child(&OsString::from("test/a")).unwrap_err();
+    }
+
+    #[test]
+    fn test_prepare_path_component() {
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from("")).is_err());
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from(".")).is_err());
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from("..")).is_err());
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from("/")).is_err());
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from("//")).is_err());
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from("a/b")).is_err());
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from("./b")).is_err());
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from("a/.")).is_err());
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from("a/..")).is_err());
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from("a/./")).is_err());
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from("a/../")).is_err());
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from("a/./a")).is_err());
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from("a/../a")).is_err());
+
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from("a")).is_ok());
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from("a.b")).is_ok());
+        assert!(PinnedPathBuf::prepare_path_component(&OsString::from("a..b")).is_ok());
+    }
+
+    #[test]
+    fn test_target_fs_object_changed() {
+        let rootfs_dir = tempfile::tempdir().expect("failed to create tmpdir");
+        let rootfs_path = rootfs_dir.path();
+        let file = rootfs_path.join("child");
+        fs::write(&file, "test").unwrap();
+
+        let path = PinnedPathBuf::from_path(&file).unwrap();
+        let path3 = fs::read_link(path.as_path()).unwrap();
+        assert_eq!(&path3, path.target());
+        fs::rename(file, rootfs_path.join("child2")).unwrap();
+        let path4 = fs::read_link(path.as_path()).unwrap();
+        assert_ne!(&path4, path.target());
+        fs::remove_file(rootfs_path.join("child2")).unwrap();
+        let path5 = fs::read_link(path.as_path()).unwrap();
+        assert_ne!(&path4, &path5);
     }
 }

src/libs/safe-path/src/scoped_dir_builder.rs

@@ -253,9 +253,42 @@ mod tests {
         builder.create("../../.").unwrap();
         builder.create("").unwrap();
         builder.create_with_unscoped_path("/").unwrap();
-        builder.create_with_unscoped_path(".").unwrap();
-        builder.create_with_unscoped_path("..").unwrap();
-        builder.create_with_unscoped_path("../../.").unwrap();
-        builder.create_with_unscoped_path("").unwrap();
+        builder.create_with_unscoped_path("/..").unwrap();
+        builder.create_with_unscoped_path("/../.").unwrap();
+    }
+
+    #[test]
+    fn test_create_with_absolute_path() {
+        // create temporary directory to emulate container rootfs with symlink
+        let rootfs_dir = tempdir().expect("failed to create tmpdir");
+        DirBuilder::new()
+            .create(rootfs_dir.path().join("b"))
+            .unwrap();
+        symlink(rootfs_dir.path().join("b"), rootfs_dir.path().join("a")).unwrap();
+        let rootfs_path = &rootfs_dir.path().join("a");
+
+        let mut builder = ScopedDirBuilder::new(&rootfs_path).unwrap();
+        builder.create_with_unscoped_path("/").unwrap_err();
+        builder
+            .create_with_unscoped_path(rootfs_path.join("../__xxxx___xxx__"))
+            .unwrap_err();
+        builder
+            .create_with_unscoped_path(rootfs_path.join("c/d"))
+            .unwrap_err();
+
+        // Return `AlreadyExist` when recursive is false
+        builder.create_with_unscoped_path(&rootfs_path).unwrap_err();
+        builder
+            .create_with_unscoped_path(rootfs_path.join("."))
+            .unwrap_err();
+
+        builder.recursive(true);
+        builder.create_with_unscoped_path(&rootfs_path).unwrap();
+        builder
+            .create_with_unscoped_path(rootfs_path.join("."))
+            .unwrap();
+        builder
+            .create_with_unscoped_path(rootfs_path.join("c/d"))
+            .unwrap();
     }
 }

src/libs/safe-path/src/scoped_path_resolver.rs

@@ -319,6 +319,97 @@ mod tests {
         // Detect symlink loop.
         fs::symlink("/endpoint_b", rootfs_path.join("endpoint_a")).unwrap();
         fs::symlink("/endpoint_a", rootfs_path.join("endpoint_b")).unwrap();
+        scoped_resolve(rootfs_path, "endpoint_a").unwrap_err();
+    }
+
+    #[test]
+    fn test_scoped_join() {
+        // create temporary directory to emulate container rootfs with symlink
+        let rootfs_dir = tempdir().expect("failed to create tmpdir");
+        let rootfs_path = &rootfs_dir.path();
+
+        assert_eq!(
+            scoped_join(&rootfs_path, "a").unwrap(),
+            rootfs_path.join("a")
+        );
+        assert_eq!(
+            scoped_join(&rootfs_path, "./a").unwrap(),
+            rootfs_path.join("a")
+        );
+        assert_eq!(
+            scoped_join(&rootfs_path, "././a").unwrap(),
+            rootfs_path.join("a")
+        );
+        assert_eq!(
+            scoped_join(&rootfs_path, "c/d/../../a").unwrap(),
+            rootfs_path.join("a")
+        );
+        assert_eq!(
+            scoped_join(&rootfs_path, "c/d/../../../.././a").unwrap(),
+            rootfs_path.join("a")
+        );
+        assert_eq!(
+            scoped_join(&rootfs_path, "../../a").unwrap(),
+            rootfs_path.join("a")
+        );
+        assert_eq!(
+            scoped_join(&rootfs_path, "./../a").unwrap(),
+            rootfs_path.join("a")
+        );
+    }
+
+    #[test]
+    fn test_scoped_join_symlink() {
+        // create temporary directory to emulate container rootfs with symlink
+        let rootfs_dir = tempdir().expect("failed to create tmpdir");
+        let rootfs_path = &rootfs_dir.path();
+        DirBuilder::new()
+            .recursive(true)
+            .create(rootfs_dir.path().join("b/c"))
+            .unwrap();
+        fs::symlink("b/c", rootfs_dir.path().join("a")).unwrap();
+
+        let target = rootfs_path.join("b/c");
+        assert_eq!(scoped_join(&rootfs_path, "a").unwrap(), target);
+        assert_eq!(scoped_join(&rootfs_path, "./a").unwrap(), target);
+        assert_eq!(scoped_join(&rootfs_path, "././a").unwrap(), target);
+        assert_eq!(scoped_join(&rootfs_path, "b/c/../../a").unwrap(), target);
+        assert_eq!(
+            scoped_join(&rootfs_path, "b/c/../../../.././a").unwrap(),
+            target
+        );
+        assert_eq!(scoped_join(&rootfs_path, "../../a").unwrap(), target);
+        assert_eq!(scoped_join(&rootfs_path, "./../a").unwrap(), target);
+        assert_eq!(scoped_join(&rootfs_path, "a/../../../a").unwrap(), target);
+        assert_eq!(scoped_join(&rootfs_path, "a/../../../b/c").unwrap(), target);
+    }
+
+    #[test]
+    fn test_scoped_join_symlink_loop() {
+        // create temporary directory to emulate container rootfs with symlink
+        let rootfs_dir = tempdir().expect("failed to create tmpdir");
+        let rootfs_path = &rootfs_dir.path();
+        fs::symlink("/endpoint_b", rootfs_path.join("endpoint_a")).unwrap();
+        fs::symlink("/endpoint_a", rootfs_path.join("endpoint_b")).unwrap();
         scoped_join(rootfs_path, "endpoint_a").unwrap_err();
     }
+
+    #[test]
+    fn test_scoped_join_unicode_character() {
+        // create temporary directory to emulate container rootfs with symlink
+        let rootfs_dir = tempdir().expect("failed to create tmpdir");
+        let rootfs_path = &rootfs_dir.path().canonicalize().unwrap();
+
+        let path = scoped_join(rootfs_path, "您好").unwrap();
+        assert_eq!(path, rootfs_path.join("您好"));
+
+        let path = scoped_join(rootfs_path, "../../../您好").unwrap();
+        assert_eq!(path, rootfs_path.join("您好"));
+
+        let path = scoped_join(rootfs_path, "。。/您好").unwrap();
+        assert_eq!(path, rootfs_path.join("。。/您好"));
+
+        let path = scoped_join(rootfs_path, "您好/../../test").unwrap();
+        assert_eq!(path, rootfs_path.join("test"));
+    }
 }