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From: Christian Ebner <c.ebner@proxmox.com>
To: pbs-devel@lists.proxmox.com
Date: Mon, 19 May 2025 13:46:39 +0200
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Subject: [pbs-devel] [RFC proxmox-backup 38/39] datastore: get and set owner
for S3 store backend
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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@proxmox.com>
---
pbs-datastore/src/datastore.rs | 34 +++++++++++++++++++++++++++++++++-
1 file changed, 33 insertions(+), 1 deletion(-)
diff --git a/pbs-datastore/src/datastore.rs b/pbs-datastore/src/datastore.rs
index 19d4ca02c..9c8b7de03 100644
--- a/pbs-datastore/src/datastore.rs
+++ b/pbs-datastore/src/datastore.rs
@@ -8,7 +8,7 @@ use std::time::{Duration, SystemTime};
use anyhow::{bail, format_err, Context, Error};
use nix::unistd::{unlinkat, UnlinkatFlags};
-use pbs_s3_client::{S3Client, S3ClientOptions};
+use pbs_s3_client::{PutObjectResponse, S3Client, S3ClientOptions};
use pbs_tools::lru_cache::LruCache;
use tracing::{info, warn};
@@ -840,6 +840,22 @@ 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 = full_path
+ .to_str()
+ .ok_or_else(|| format_err!("unexpected owner path"))?;
+ let response =
+ proxmox_async::runtime::block_on(s3_client.get_object(object_key.into()))?
+ .ok_or_else(|| format_err!("fetching owner failed"))?;
+ let content =
+ proxmox_async::runtime::block_on(hyper::body::HttpBody::collect(response.content))?;
+ 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
@@ -868,6 +884,22 @@ impl DataStore {
) -> Result<(), Error> {
let path = self.owner_path(ns, backup_group);
+ if let DatastoreBackend::S3(s3_client) = self.backend()? {
+ let object_key = path
+ .to_str()
+ .ok_or_else(|| format_err!("unexpected owner path"))?;
+ let data = hyper::body::Body::from(format!("{auth_id}\n"));
+ let response =
+ proxmox_async::runtime::block_on(s3_client.put_object(object_key.into(), data))?;
+ match response {
+ PutObjectResponse::NeedsRetry => bail!("failed to set owner, needs retry"),
+ PutObjectResponse::PreconditionFailed => {
+ bail!("failed to set owner, precondition failed")
+ }
+ PutObjectResponse::Success(_) => return Ok(()),
+ }
+ }
+
let mut open_options = std::fs::OpenOptions::new();
open_options.write(true);
--
2.39.5
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