[pve-devel] [PATCH proxmox v4 03/15] proxmox-oci: add tests for whiteout handling

From: Filip Schauer <f.schauer@proxmox.com>
To: pve-devel@lists.proxmox.com
Subject: [pve-devel] [PATCH proxmox v4 03/15] proxmox-oci: add tests for whiteout handling
Date: Mon,  8 Sep 2025 17:02:06 +0200	[thread overview]
Message-ID: <20250908150224.155373-4-f.schauer@proxmox.com> (raw)
In-Reply-To: <20250908150224.155373-1-f.schauer@proxmox.com>

Test extracting OCI images with whiteout special cases.

Test cases inspired by:
https://github.com/containerd/containerd/blob/4312e076a8a3/pkg/archive/tar_test.go

Signed-off-by: Filip Schauer <f.schauer@proxmox.com>
---
Introduced in v4

 proxmox-oci/Cargo.toml                        |   3 +
 proxmox-oci/tests/extract_whiteouts.rs        |  92 ++++++++++++++++++
 .../oci_test_whiteout_current_directory.tar   | Bin 0 -> 8704 bytes
 .../oci_test_whiteout_dead_symlink_parent.tar | Bin 0 -> 8704 bytes
 .../oci_test_whiteout_root_breakout.tar       | Bin 0 -> 7168 bytes
 ...oci_test_whiteout_root_parent_breakout.tar | Bin 0 -> 7168 bytes
 .../oci_test_whiteout_symlink.tar             | Bin 0 -> 8704 bytes
 7 files changed, 95 insertions(+)
 create mode 100644 proxmox-oci/tests/extract_whiteouts.rs
 create mode 100644 proxmox-oci/tests/oci_image_data/oci_test_whiteout_current_directory.tar
 create mode 100644 proxmox-oci/tests/oci_image_data/oci_test_whiteout_dead_symlink_parent.tar
 create mode 100644 proxmox-oci/tests/oci_image_data/oci_test_whiteout_root_breakout.tar
 create mode 100644 proxmox-oci/tests/oci_image_data/oci_test_whiteout_root_parent_breakout.tar
 create mode 100644 proxmox-oci/tests/oci_image_data/oci_test_whiteout_symlink.tar

diff --git a/proxmox-oci/Cargo.toml b/proxmox-oci/Cargo.toml
index 4daff6ab..b162bf4f 100644
--- a/proxmox-oci/Cargo.toml
+++ b/proxmox-oci/Cargo.toml
@@ -20,3 +20,6 @@ thiserror = "1"
 zstd.workspace = true
 
 proxmox-io.workspace = true
+
+[dev-dependencies]
+proxmox-sys.workspace = true
diff --git a/proxmox-oci/tests/extract_whiteouts.rs b/proxmox-oci/tests/extract_whiteouts.rs
new file mode 100644
index 00000000..71ec4dea
--- /dev/null
+++ b/proxmox-oci/tests/extract_whiteouts.rs
@@ -0,0 +1,92 @@
+use std::fs::remove_dir_all;
+
+use proxmox_oci::{parse_and_extract_image, Arch};
+use proxmox_sys::fs::make_tmp_dir;
+
+#[test]
+fn test_whiteout_root_breakout() {
+    let extract_dir = make_tmp_dir("/tmp/", None).unwrap();
+
+    parse_and_extract_image(
+        &"tests/oci_image_data/oci_test_whiteout_root_breakout.tar".into(),
+        &extract_dir,
+        Some(&Arch::Amd64),
+    )
+    .unwrap();
+
+    // Check that the whiteout did not remove the root directory
+    assert!(extract_dir.exists());
+
+    // Cleanup
+    remove_dir_all(extract_dir).unwrap();
+}
+
+#[test]
+fn test_whiteout_root_parent_breakout() {
+    let extract_dir = make_tmp_dir("/tmp/", None).unwrap();
+
+    parse_and_extract_image(
+        &"tests/oci_image_data/oci_test_whiteout_root_parent_breakout.tar".into(),
+        &extract_dir,
+        Some(&Arch::Amd64),
+    )
+    .unwrap();
+
+    // Check that the whiteout did not remove the root directory
+    assert!(extract_dir.exists());
+
+    // Cleanup
+    remove_dir_all(extract_dir).unwrap();
+}
+
+#[test]
+fn test_whiteout_current_directory() {
+    let extract_dir = make_tmp_dir("/tmp/", None).unwrap();
+
+    parse_and_extract_image(
+        &"tests/oci_image_data/oci_test_whiteout_current_directory.tar".into(),
+        &extract_dir,
+        Some(&Arch::Amd64),
+    )
+    .unwrap();
+
+    assert!(!extract_dir.join("etc").exists());
+
+    // Cleanup
+    remove_dir_all(extract_dir).unwrap();
+}
+
+#[test]
+fn test_whiteout_symlink() {
+    let extract_dir = make_tmp_dir("/tmp/", None).unwrap();
+
+    parse_and_extract_image(
+        &"tests/oci_image_data/oci_test_whiteout_symlink.tar".into(),
+        &extract_dir,
+        Some(&Arch::Amd64),
+    )
+    .unwrap();
+
+    assert!(extract_dir.join("etc/passwd").exists());
+    assert!(!extract_dir.join("localetc").exists());
+
+    // Cleanup
+    remove_dir_all(extract_dir).unwrap();
+}
+
+#[test]
+fn test_whiteout_dead_symlink_parent() {
+    let extract_dir = make_tmp_dir("/tmp/", None).unwrap();
+
+    parse_and_extract_image(
+        &"tests/oci_image_data/oci_test_whiteout_dead_symlink_parent.tar".into(),
+        &extract_dir,
+        Some(&Arch::Amd64),
+    )
+    .unwrap();
+
+    assert!(extract_dir.join("etc/passwd").exists());
+
+    // Cleanup
+    remove_dir_all(extract_dir).unwrap();
+}
diff --git a/proxmox-oci/tests/oci_image_data/oci_test_whiteout_current_directory.tar b/proxmox-oci/tests/oci_image_data/oci_test_whiteout_current_directory.tar
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-- 
2.47.2



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