[pbs-devel] [RFC pxar 10/36] encoder/format: finish payload stream with marker

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

Mark the end of the optional payload stream, this makes sure that at
least some bytes are written to the stream (as empty archives are not
allowed by the proxmox backup server) and possible injected chunks
must be consumed.

Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
---
 examples/mk-format-hashes.rs | 5 +++++
 src/encoder/mod.rs           | 7 +++++++
 src/format/mod.rs            | 2 ++
 3 files changed, 14 insertions(+)

diff --git a/examples/mk-format-hashes.rs b/examples/mk-format-hashes.rs
index 83adb38..de73df0 100644
--- a/examples/mk-format-hashes.rs
+++ b/examples/mk-format-hashes.rs
@@ -56,6 +56,11 @@ const CONSTANTS: &[(&str, &str, &str)] = &[
         "PXAR_GOODBYE_TAIL_MARKER",
         "__PROXMOX_FORMAT_PXAR_GOODBYE_TAIL_MARKER__",
     ),
+    (
+        "The end marker used in the separate payload stream",
+        "PXAR_PAYLOAD_TAIL_MARKER",
+        "__PROXMOX_FORMAT_PXAR_PAYLOAD_TAIL_MARKER__",
+    ),
 ];
 
 fn main() {
diff --git a/src/encoder/mod.rs b/src/encoder/mod.rs
index dbb6fcb..9854114 100644
--- a/src/encoder/mod.rs
+++ b/src/encoder/mod.rs
@@ -890,6 +890,13 @@ impl<'a, T: SeqWrite + 'a> EncoderImpl<'a, T> {
 
         if let EncoderOutput::Owned(output) = &mut self.payload_output {
             if let Some(output) = output {
+                seq_write_pxar_entry(
+                    output,
+                    format::PXAR_PAYLOAD_TAIL_MARKER,
+                    &[],
+                    &mut state.payload_write_position,
+                )
+                .await?;
                 flush(output).await?;
             }
         }
diff --git a/src/format/mod.rs b/src/format/mod.rs
index 3512691..d6fad49 100644
--- a/src/format/mod.rs
+++ b/src/format/mod.rs
@@ -105,6 +105,8 @@ pub const PXAR_PAYLOAD_REF: u64 = 0x419d3d6bc4ba977e;
 pub const PXAR_GOODBYE: u64 = 0x2fec4fa642d5731d;
 /// The end marker used in the GOODBYE object
 pub const PXAR_GOODBYE_TAIL_MARKER: u64 = 0xef5eed5b753e1555;
+/// The end marker used in the separate payload stream
+pub const PXAR_PAYLOAD_TAIL_MARKER: u64 = 0x6c72b78b984c81b5;
 
 #[derive(Debug, Endian)]
 #[repr(C)]
-- 
2.39.2