[pbs-devel] [PATCH v5 proxmox-backup] Replace all occurences of open() with O_TMPFILE

[Mira Limbeck <m.limbeck@proxmox.com>]

with the tempfile() helper function from proxmox::tools. This abstracts
away the open() and adds a fallback to mkstemp() should open() with
O_TMPFILE fail.

This helps in getting the backup client to work under WSL (Windows
Subsystem for Linux).

Signed-off-by: Mira Limbeck <m.limbeck@proxmox.com>
---
This requires the tempfile() addition in the proxmox crate to work.

v5:
 - no changes
v4:
 - no changes
v3:
 - no changes

 src/bin/proxmox_backup_client/catalog.rs | 20 ++++----------------
 src/client/backup_reader.rs              | 21 ++++-----------------
 src/client/backup_writer.rs              | 15 +++------------
 3 files changed, 11 insertions(+), 45 deletions(-)

diff --git a/src/bin/proxmox_backup_client/catalog.rs b/src/bin/proxmox_backup_client/catalog.rs
index b419728e..15df232b 100644
--- a/src/bin/proxmox_backup_client/catalog.rs
+++ b/src/bin/proxmox_backup_client/catalog.rs
@@ -1,4 +1,3 @@
-use std::os::unix::fs::OpenOptionsExt;
 use std::io::{Seek, SeekFrom};
 use std::sync::Arc;
 
@@ -6,6 +5,7 @@ use anyhow::{bail, format_err, Error};
 use serde_json::Value;
 
 use proxmox::api::{api, cli::*};
+use proxmox::tools::fs::tempfile;
 
 use proxmox_backup::tools;
 
@@ -103,11 +103,7 @@ async fn dump_catalog(param: Value) -> Result<Value, Error> {
 
     let mut reader = BufferedDynamicReader::new(index, chunk_reader);
 
-    let mut catalogfile = std::fs::OpenOptions::new()
-        .write(true)
-        .read(true)
-        .custom_flags(libc::O_TMPFILE)
-        .open("/tmp")?;
+    let mut catalogfile = tempfile()?;
 
     std::io::copy(&mut reader, &mut catalogfile)
         .map_err(|err| format_err!("unable to download catalog - {}", err))?;
@@ -192,11 +188,7 @@ async fn catalog_shell(param: Value) -> Result<(), Error> {
         true,
     ).await?;
 
-    let mut tmpfile = std::fs::OpenOptions::new()
-        .write(true)
-        .read(true)
-        .custom_flags(libc::O_TMPFILE)
-        .open("/tmp")?;
+    let mut tmpfile = tempfile()?;
 
     let (manifest, _) = client.download_manifest().await?;
 
@@ -224,11 +216,7 @@ async fn catalog_shell(param: Value) -> Result<(), Error> {
     let file_info = manifest.lookup_file_info(&CATALOG_NAME)?;
     let chunk_reader = RemoteChunkReader::new(client.clone(), crypt_config, file_info.chunk_crypt_mode(), most_used);
     let mut reader = BufferedDynamicReader::new(index, chunk_reader);
-    let mut catalogfile = std::fs::OpenOptions::new()
-        .write(true)
-        .read(true)
-        .custom_flags(libc::O_TMPFILE)
-        .open("/tmp")?;
+    let mut catalogfile = tempfile()?;
 
     std::io::copy(&mut reader, &mut catalogfile)
         .map_err(|err| format_err!("unable to download catalog - {}", err))?;
diff --git a/src/client/backup_reader.rs b/src/client/backup_reader.rs
index d4185716..45370141 100644
--- a/src/client/backup_reader.rs
+++ b/src/client/backup_reader.rs
@@ -2,13 +2,12 @@ use anyhow::{format_err, Error};
 use std::io::{Read, Write, Seek, SeekFrom};
 use std::fs::File;
 use std::sync::Arc;
-use std::os::unix::fs::OpenOptionsExt;
 
 use chrono::{DateTime, Utc};
 use futures::future::AbortHandle;
 use serde_json::{json, Value};
 
-use proxmox::tools::digest_to_hex;
+use proxmox::tools::{digest_to_hex, fs::tempfile};
 
 use crate::backup::*;
 
@@ -148,11 +147,7 @@ impl BackupReader {
         name: &str,
     ) -> Result<DataBlobReader<File>, Error> {
 
-        let mut tmpfile = std::fs::OpenOptions::new()
-            .write(true)
-            .read(true)
-            .custom_flags(libc::O_TMPFILE)
-            .open("/tmp")?;
+        let mut tmpfile = tempfile()?;
 
         self.download(name, &mut tmpfile).await?;
 
@@ -174,11 +169,7 @@ impl BackupReader {
         name: &str,
     ) -> Result<DynamicIndexReader, Error> {
 
-        let mut tmpfile = std::fs::OpenOptions::new()
-            .write(true)
-            .read(true)
-            .custom_flags(libc::O_TMPFILE)
-            .open("/tmp")?;
+        let mut tmpfile = tempfile()?;
 
         self.download(name, &mut tmpfile).await?;
 
@@ -202,11 +193,7 @@ impl BackupReader {
         name: &str,
     ) -> Result<FixedIndexReader, Error> {
 
-        let mut tmpfile = std::fs::OpenOptions::new()
-            .write(true)
-            .read(true)
-            .custom_flags(libc::O_TMPFILE)
-            .open("/tmp")?;
+        let mut tmpfile = tempfile()?;
 
         self.download(name, &mut tmpfile).await?;
 
diff --git a/src/client/backup_writer.rs b/src/client/backup_writer.rs
index 38686f67..e04ad56a 100644
--- a/src/client/backup_writer.rs
+++ b/src/client/backup_writer.rs
@@ -1,5 +1,4 @@
 use std::collections::HashSet;
-use std::os::unix::fs::OpenOptionsExt;
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::{Arc, Mutex};
 
@@ -12,7 +11,7 @@ use serde_json::{json, Value};
 use tokio::io::AsyncReadExt;
 use tokio::sync::{mpsc, oneshot};
 
-use proxmox::tools::digest_to_hex;
+use proxmox::tools::{digest_to_hex, fs::tempfile};
 
 use super::merge_known_chunks::{MergedChunkInfo, MergeKnownChunks};
 use crate::backup::*;
@@ -408,11 +407,7 @@ impl BackupWriter {
         known_chunks: Arc<Mutex<HashSet<[u8;32]>>>,
     ) -> Result<FixedIndexReader, Error> {
 
-        let mut tmpfile = std::fs::OpenOptions::new()
-            .write(true)
-            .read(true)
-            .custom_flags(libc::O_TMPFILE)
-            .open("/tmp")?;
+        let mut tmpfile = tempfile()?;
 
         let param = json!({ "archive-name": archive_name });
         self.h2.download("previous", Some(param), &mut tmpfile).await?;
@@ -443,11 +438,7 @@ impl BackupWriter {
         known_chunks: Arc<Mutex<HashSet<[u8;32]>>>,
     ) -> Result<DynamicIndexReader, Error> {
 
-        let mut tmpfile = std::fs::OpenOptions::new()
-            .write(true)
-            .read(true)
-            .custom_flags(libc::O_TMPFILE)
-            .open("/tmp")?;
+        let mut tmpfile = tempfile()?;
 
         let param = json!({ "archive-name": archive_name });
         self.h2.download("previous", Some(param), &mut tmpfile).await?;
-- 
2.20.1