90 lines
2.5 KiB
Rust
90 lines
2.5 KiB
Rust
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use std::fs::File;
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use std::io::Read;
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use proxmox::{
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sys::error::SysError,
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tools::Uuid,
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};
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use crate::{
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tape::{
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TapeWrite,
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file_formats::{
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PROXMOX_TAPE_BLOCK_SIZE,
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PROXMOX_BACKUP_CATALOG_ARCHIVE_MAGIC_1_0,
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MediaContentHeader,
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CatalogArchiveHeader,
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},
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},
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};
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/// Write a media catalog to the tape
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///
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/// Returns `Ok(Some(content_uuid))` on success, and `Ok(None)` if
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/// `LEOM` was detected before all data was written. The stream is
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/// marked inclomplete in that case and does not contain all data (The
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/// backup task must rewrite the whole file on the next media).
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///
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pub fn tape_write_catalog<'a>(
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writer: &mut (dyn TapeWrite + 'a),
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uuid: &Uuid,
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media_set_uuid: &Uuid,
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seq_nr: usize,
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file: &mut File,
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) -> Result<Option<Uuid>, std::io::Error> {
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let archive_header = CatalogArchiveHeader {
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uuid: uuid.clone(),
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media_set_uuid: media_set_uuid.clone(),
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seq_nr: seq_nr as u64,
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};
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let header_data = serde_json::to_string_pretty(&archive_header)?.as_bytes().to_vec();
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let header = MediaContentHeader::new(
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PROXMOX_BACKUP_CATALOG_ARCHIVE_MAGIC_1_0, header_data.len() as u32);
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let content_uuid: Uuid = header.uuid.into();
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let leom = writer.write_header(&header, &header_data)?;
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if leom {
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writer.finish(true)?; // mark as incomplete
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return Ok(None);
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}
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let mut file_copy_buffer = proxmox::tools::vec::undefined(PROXMOX_TAPE_BLOCK_SIZE);
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let result: Result<(), std::io::Error> = proxmox::try_block!({
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let file_size = file.metadata()?.len();
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let mut remaining = file_size;
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while remaining != 0 {
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let got = file.read(&mut file_copy_buffer[..])?;
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if got as u64 > remaining {
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proxmox::io_bail!("catalog '{}' changed while reading", uuid);
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}
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writer.write_all(&file_copy_buffer[..got])?;
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remaining -= got as u64;
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}
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if remaining > 0 {
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proxmox::io_bail!("catalog '{}' shrunk while reading", uuid);
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}
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Ok(())
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});
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match result {
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Ok(()) => {
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writer.finish(false)?;
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Ok(Some(content_uuid))
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}
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Err(err) => {
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if err.is_errno(nix::errno::Errno::ENOSPC) && writer.logical_end_of_media() {
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writer.finish(true)?; // mark as incomplete
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Ok(None)
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} else {
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Err(err)
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}
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}
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}
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}
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