[pbs-devel] [RFC proxmox-backup 15/20] fix #3174: archiver: store ref to previous backup

[Christian Ebner <c.ebner@proxmox.com>]

Adds the statefull information needed for accessing the previous backups
information such as the index and catalog.

This patch only introduces the struct and interface, by setting all
occurrences to None it is not used for now.

Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
---
 pbs-client/src/pxar/create.rs                 | 19 +++++++++++++++++--
 pbs-client/src/pxar/mod.rs                    |  2 +-
 proxmox-backup-client/src/main.rs             |  1 +
 .../src/proxmox_restore_daemon/api.rs         |  1 +
 pxar-bin/src/main.rs                          | 17 +++++++++--------
 5 files changed, 29 insertions(+), 11 deletions(-)

diff --git a/pbs-client/src/pxar/create.rs b/pbs-client/src/pxar/create.rs
index c0fc5e2d..5feb7e6e 100644
--- a/pbs-client/src/pxar/create.rs
+++ b/pbs-client/src/pxar/create.rs
@@ -24,14 +24,15 @@ use proxmox_io::vec;
 use proxmox_lang::c_str;
 use proxmox_sys::fs::{self, acl, xattr};
 
-use pbs_datastore::catalog::BackupCatalogWriter;
+use pbs_datastore::catalog::{BackupCatalogWriter, CatalogReader};
+use pbs_datastore::dynamic_index::DynamicIndexReader;
 
 use crate::pxar::metadata::errno_is_unsupported;
 use crate::pxar::tools::assert_single_path_component;
 use crate::pxar::Flags;
 
 /// Pxar options for creating a pxar archive/stream
-#[derive(Default, Clone)]
+#[derive(Default)]
 pub struct PxarCreateOptions {
     /// Device/mountpoint st_dev numbers that should be included. None for no limitation.
     pub device_set: Option<HashSet<u64>>,
@@ -41,6 +42,18 @@ pub struct PxarCreateOptions {
     pub entries_max: usize,
     /// Skip lost+found directory
     pub skip_lost_and_found: bool,
+    /// Reference state for partial backups
+    pub previous_ref: Option<PxarPrevRef>,
+}
+
+/// Contains statefull information of previous backups snapshots for partial backups
+pub struct PxarPrevRef {
+    /// Reference index for partial backups
+    pub index: DynamicIndexReader,
+    /// Reference catalog for partial backups
+    pub catalog: CatalogReader<std::fs::File>,
+    /// Reference archive name for partial backups
+    pub archive_name: String,
 }
 
 pub fn detect_fs_type(fd: RawFd) -> Result<i64, Error> {
@@ -128,6 +141,7 @@ struct Archiver {
     device_set: Option<HashSet<u64>>,
     hardlinks: HashMap<HardLinkInfo, (PathBuf, LinkOffset)>,
     file_copy_buffer: Vec<u8>,
+    previous_ref: Option<PxarPrevRef>,
 }
 
 type Encoder<'a, T> = pxar::encoder::aio::Encoder<'a, T>;
@@ -192,6 +206,7 @@ where
         device_set,
         hardlinks: HashMap::new(),
         file_copy_buffer: vec::undefined(4 * 1024 * 1024),
+        previous_ref: options.previous_ref,
     };
 
     archiver
diff --git a/pbs-client/src/pxar/mod.rs b/pbs-client/src/pxar/mod.rs
index 14674b9b..24315f5f 100644
--- a/pbs-client/src/pxar/mod.rs
+++ b/pbs-client/src/pxar/mod.rs
@@ -56,7 +56,7 @@ pub(crate) mod tools;
 mod flags;
 pub use flags::Flags;
 
-pub use create::{create_archive, PxarCreateOptions};
+pub use create::{create_archive, PxarCreateOptions, PxarPrevRef};
 pub use extract::{
     create_tar, create_zip, extract_archive, extract_sub_dir, extract_sub_dir_seq, ErrorHandler,
     OverwriteFlags, PxarExtractContext, PxarExtractOptions,
diff --git a/proxmox-backup-client/src/main.rs b/proxmox-backup-client/src/main.rs
index 1a13291a..509fa22c 100644
--- a/proxmox-backup-client/src/main.rs
+++ b/proxmox-backup-client/src/main.rs
@@ -993,6 +993,7 @@ async fn create_backup(
                     patterns: pattern_list.clone(),
                     entries_max: entries_max as usize,
                     skip_lost_and_found,
+                    previous_ref: None,
                 };
 
                 let upload_options = UploadOptions {
diff --git a/proxmox-restore-daemon/src/proxmox_restore_daemon/api.rs b/proxmox-restore-daemon/src/proxmox_restore_daemon/api.rs
index 95e3593b..27f20a1c 100644
--- a/proxmox-restore-daemon/src/proxmox_restore_daemon/api.rs
+++ b/proxmox-restore-daemon/src/proxmox_restore_daemon/api.rs
@@ -353,6 +353,7 @@ fn extract(
                         device_set: None,
                         patterns,
                         skip_lost_and_found: false,
+                        previous_ref: None,
                     };
 
                     let pxar_writer = TokioWriter::new(writer);
diff --git a/pxar-bin/src/main.rs b/pxar-bin/src/main.rs
index bc044035..9376a2c1 100644
--- a/pxar-bin/src/main.rs
+++ b/pxar-bin/src/main.rs
@@ -330,13 +330,6 @@ async fn create_archive(
         Some(HashSet::new())
     };
 
-    let options = pbs_client::pxar::PxarCreateOptions {
-        entries_max: entries_max as usize,
-        device_set,
-        patterns,
-        skip_lost_and_found: false,
-    };
-
     let source = PathBuf::from(source);
 
     let dir = nix::dir::Dir::open(
@@ -349,7 +342,7 @@ async fn create_archive(
         .create_new(true)
         .write(true)
         .mode(0o640)
-        .open(archive)?;
+        .open(archive.clone())?;
 
     let writer = std::io::BufWriter::with_capacity(1024 * 1024, file);
     let mut feature_flags = Flags::DEFAULT;
@@ -372,6 +365,14 @@ async fn create_archive(
         feature_flags.remove(Flags::WITH_SOCKETS);
     }
 
+    let options = pbs_client::pxar::PxarCreateOptions {
+        entries_max: entries_max as usize,
+        device_set,
+        patterns,
+        skip_lost_and_found: false,
+        previous_ref: None,
+    };
+
     let writer = pxar::encoder::sync::StandardWriter::new(writer);
     pbs_client::pxar::create_archive(
         dir,
-- 
2.39.2