[pbs-devel] [PATCH proxmox-backup v5 29/46] datastore: get and set owner for s3 store backend

[Christian Ebner]

Read or write the ownership information from/to the corresponding
object in the S3 object store. Keep that information available if
the bucket is reused as datastore.

Signed-off-by: Christian Ebner <c.ebner at proxmox.com>
---
 pbs-datastore/src/datastore.rs | 35 ++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/pbs-datastore/src/datastore.rs b/pbs-datastore/src/datastore.rs
index fe14e5bd5..e7dfabf40 100644
--- a/pbs-datastore/src/datastore.rs
+++ b/pbs-datastore/src/datastore.rs
@@ -7,6 +7,7 @@ use std::sync::{Arc, LazyLock, Mutex};
 use std::time::Duration;
 
 use anyhow::{bail, format_err, Context, Error};
+use http_body_util::BodyExt;
 use nix::unistd::{unlinkat, UnlinkatFlags};
 use pbs_s3_client::{S3Client, S3ClientOptions};
 use pbs_tools::lru_cache::LruCache;
@@ -835,6 +836,24 @@ impl DataStore {
         backup_group: &pbs_api_types::BackupGroup,
     ) -> Result<Authid, Error> {
         let full_path = self.owner_path(ns, backup_group);
+
+        if let DatastoreBackend::S3(s3_client) = self.backend()? {
+            let object_key = format!(
+                "{}/{backup_group}/owner",
+                ns.path()
+                    .to_str()
+                    .ok_or_else(|| format_err!("unexpected owner path"))?,
+            );
+            let response =
+                proxmox_async::runtime::block_on(s3_client.get_object(object_key.as_str().into()))?
+                    .ok_or_else(|| format_err!("fetching owner failed"))?;
+            let content = proxmox_async::runtime::block_on(response.content.collect())?;
+            let owner = String::from_utf8(content.to_bytes().trim_ascii_end().to_vec())?;
+            return owner
+                .parse()
+                .map_err(|err| format_err!("parsing owner for {backup_group} failed: {err}"));
+        }
+
         let owner = proxmox_sys::fs::file_read_firstline(full_path)?;
         owner
             .trim_end() // remove trailing newline
@@ -863,6 +882,22 @@ impl DataStore {
     ) -> Result<(), Error> {
         let path = self.owner_path(ns, backup_group);
 
+        if let DatastoreBackend::S3(s3_client) = self.backend()? {
+            let object_key = format!(
+                "{}/{backup_group}/owner",
+                ns.path()
+                    .to_str()
+                    .ok_or_else(|| format_err!("unexpected owner path"))?,
+            );
+            let data = hyper::body::Bytes::from(format!("{auth_id}\n"));
+            let _is_duplicate = proxmox_async::runtime::block_on(s3_client.upload_with_retry(
+                object_key.as_str().into(),
+                data,
+                true,
+            ))
+            .context("failed to set owner on s3 backend")?;
+        }
+
         let mut open_options = std::fs::OpenOptions::new();
         open_options.write(true);
 
-- 
2.47.2