* [pve-devel] [PATCH proxmox 1/2] oci: fix rootfs extraction when paths already exist
2025-12-01 17:13 [pve-devel] [PATCH proxmox 0/2] fix rootfs extraction when paths already exist Filip Schauer
@ 2025-12-01 17:13 ` Filip Schauer
2025-12-01 17:13 ` [pve-devel] [PATCH proxmox 2/2] oci: test replacing files in subsequent layers Filip Schauer
1 sibling, 0 replies; 3+ messages in thread
From: Filip Schauer @ 2025-12-01 17:13 UTC (permalink / raw)
To: pve-devel
Remove paths from previous layers that conflict with new layer entries
before unpacking. This aligns with the OCI spec. [0]
This fixes a rootfs extraction failure with docker.io/grafana/otel-lgtm,
which was reported in the Proxmox Forum [1].
[0] https://github.com/opencontainers/image-spec/blob/26647a49f642c7d22a1cd3aa0a48e4650a542269/layer.md#changeset-over-existing-files
[1] https://forum.proxmox.com/threads/otel-lgtm-oci-create-lxc-failed.176996/
Signed-off-by: Filip Schauer <f.schauer@proxmox.com>
---
proxmox-oci/src/lib.rs | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/proxmox-oci/src/lib.rs b/proxmox-oci/src/lib.rs
index cf0e4271..cce68207 100644
--- a/proxmox-oci/src/lib.rs
+++ b/proxmox-oci/src/lib.rs
@@ -302,6 +302,16 @@ fn extract_archive<R: Read, P: AsRef<Path>>(reader: &mut R, target_path: P) -> s
}
}
+ // If a file or directory already exists at this path, remove it first.
+ let file_path_abs = target_path.as_ref().join(file.path()?);
+ if file_path_abs.exists() {
+ if file_path_abs.is_dir() {
+ remove_dir_all(file_path_abs)?;
+ } else {
+ remove_file(file_path_abs)?;
+ }
+ }
+
file.unpack_in(&target_path)?;
}
@@ -309,6 +319,16 @@ fn extract_archive<R: Read, P: AsRef<Path>>(reader: &mut R, target_path: P) -> s
// to avoid failure on restrictive parent directory permissions.
directories.sort_by(|a, b| b.path_bytes().cmp(&a.path_bytes()));
for mut dir in directories {
+ let dir_path_abs = target_path.as_ref().join(dir.path()?);
+
+ // Remove the trailing slash
+ let dir_path_abs = dir_path_abs.components().as_path();
+
+ // If a file already exists at this path, remove it first.
+ if dir_path_abs.exists() && !dir_path_abs.is_dir() {
+ remove_file(dir_path_abs)?;
+ }
+
dir.unpack_in(&target_path)?;
}
--
2.47.3
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^ permalink raw reply [flat|nested] 3+ messages in thread* [pve-devel] [PATCH proxmox 2/2] oci: test replacing files in subsequent layers
2025-12-01 17:13 [pve-devel] [PATCH proxmox 0/2] fix rootfs extraction when paths already exist Filip Schauer
2025-12-01 17:13 ` [pve-devel] [PATCH proxmox 1/2] oci: " Filip Schauer
@ 2025-12-01 17:13 ` Filip Schauer
1 sibling, 0 replies; 3+ messages in thread
From: Filip Schauer @ 2025-12-01 17:13 UTC (permalink / raw)
To: pve-devel
Add tests that verify later layer entries properly replace paths from
earlier layers.
Signed-off-by: Filip Schauer <f.schauer@proxmox.com>
---
| 57 ++++++++++++++++++
.../oci_test_replace_dir_with_file.tar | Bin 0 -> 8704 bytes
.../oci_image_data/oci_test_replace_file.tar | Bin 0 -> 8704 bytes
.../oci_test_replace_file_with_dir.tar | Bin 0 -> 8704 bytes
4 files changed, 57 insertions(+)
create mode 100644 proxmox-oci/tests/extract_replace.rs
create mode 100644 proxmox-oci/tests/oci_image_data/oci_test_replace_dir_with_file.tar
create mode 100644 proxmox-oci/tests/oci_image_data/oci_test_replace_file.tar
create mode 100644 proxmox-oci/tests/oci_image_data/oci_test_replace_file_with_dir.tar
--git a/proxmox-oci/tests/extract_replace.rs b/proxmox-oci/tests/extract_replace.rs
new file mode 100644
index 00000000..eb41f9e3
--- /dev/null
+++ b/proxmox-oci/tests/extract_replace.rs
@@ -0,0 +1,57 @@
+use std::fs::{read_to_string, remove_dir_all};
+
+use proxmox_oci::{parse_and_extract_image, Arch};
+use proxmox_sys::fs::make_tmp_dir;
+
+#[test]
+fn test_replace_file() {
+ let extract_dir = make_tmp_dir("/tmp/", None).unwrap();
+
+ parse_and_extract_image(
+ &"tests/oci_image_data/oci_test_replace_file.tar".into(),
+ &extract_dir,
+ Some(&Arch::Amd64),
+ )
+ .unwrap();
+
+ let replaced_path = extract_dir.join("etc/a");
+ assert!(replaced_path.is_file());
+ assert_eq!(read_to_string(replaced_path).unwrap(), "2");
+
+ // Cleanup
+ remove_dir_all(extract_dir).unwrap();
+}
+
+#[test]
+fn test_replace_file_with_dir() {
+ let extract_dir = make_tmp_dir("/tmp/", None).unwrap();
+
+ parse_and_extract_image(
+ &"tests/oci_image_data/oci_test_replace_file_with_dir.tar".into(),
+ &extract_dir,
+ Some(&Arch::Amd64),
+ )
+ .unwrap();
+
+ assert!(extract_dir.join("etc/a").is_dir());
+
+ // Cleanup
+ remove_dir_all(extract_dir).unwrap();
+}
+
+#[test]
+fn test_replace_dir_with_file() {
+ let extract_dir = make_tmp_dir("/tmp/", None).unwrap();
+
+ parse_and_extract_image(
+ &"tests/oci_image_data/oci_test_replace_dir_with_file.tar".into(),
+ &extract_dir,
+ Some(&Arch::Amd64),
+ )
+ .unwrap();
+
+ assert!(extract_dir.join("etc/a").is_file());
+
+ // Cleanup
+ remove_dir_all(extract_dir).unwrap();
+}
diff --git a/proxmox-oci/tests/oci_image_data/oci_test_replace_dir_with_file.tar b/proxmox-oci/tests/oci_image_data/oci_test_replace_dir_with_file.tar
new file mode 100644
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diff --git a/proxmox-oci/tests/oci_image_data/oci_test_replace_file.tar b/proxmox-oci/tests/oci_image_data/oci_test_replace_file.tar
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--
2.47.3
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^ permalink raw reply [flat|nested] 3+ messages in thread