[pbs-devel] [PATCH proxmox-backup v2 4/9] server/worker_task: write older tasks into archive file

[Dominik Csapak <d.csapak@proxmox.com>]

instead of removing tasks beyond the 1000 that are in the index
write them into an archive file by appending them at the end
this way we can later still read them

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
---
 src/server/worker_task.rs | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/server/worker_task.rs b/src/server/worker_task.rs
index 2ce71136..4a4406e1 100644
--- a/src/server/worker_task.rs
+++ b/src/server/worker_task.rs
@@ -1,6 +1,6 @@
 use std::collections::HashMap;
 use std::fs::File;
-use std::io::{Read, BufRead, BufReader};
+use std::io::{Read, Write, BufRead, BufReader};
 use std::panic::UnwindSafe;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Mutex};
@@ -32,6 +32,7 @@ pub const PROXMOX_BACKUP_TASK_DIR: &str = PROXMOX_BACKUP_TASK_DIR_M!();
 pub const PROXMOX_BACKUP_TASK_LOCK_FN: &str = concat!(PROXMOX_BACKUP_TASK_DIR_M!(), "/.active.lock");
 pub const PROXMOX_BACKUP_ACTIVE_TASK_FN: &str = concat!(PROXMOX_BACKUP_TASK_DIR_M!(), "/active");
 pub const PROXMOX_BACKUP_INDEX_TASK_FN: &str = concat!(PROXMOX_BACKUP_TASK_DIR_M!(), "/index");
+pub const PROXMOX_BACKUP_ARCHIVE_TASK_FN: &str = concat!(PROXMOX_BACKUP_TASK_DIR_M!(), "/archive");
 
 const MAX_INDEX_TASKS: usize = 1000;
 
@@ -407,6 +408,19 @@ fn update_active_workers(new_upid: Option<&UPID>) -> Result<Vec<TaskListInfo>, E
             .group(backup_user.gid),
     )?;
 
+    if !finish_list.is_empty() && start > 0 {
+        match std::fs::OpenOptions::new().append(true).create(true).open(PROXMOX_BACKUP_ARCHIVE_TASK_FN) {
+            Ok(mut writer) => {
+                for info in &finish_list[0..start] {
+                    writer.write_all(render_task_line(&info).as_bytes())?;
+                }
+            },
+            Err(err) => bail!("could not write task archive - {}", err),
+        }
+
+        nix::unistd::chown(PROXMOX_BACKUP_ARCHIVE_TASK_FN, Some(backup_user.uid), Some(backup_user.gid))?;
+    }
+
     drop(lock);
 
     finish_list.append(&mut active_list);
-- 
2.20.1