Replace in-place compression

Compress gzip files to a temporary file first and then do an atomic
rename.

Cargo.lock

@@ -1734,6 +1734,7 @@ dependencies = [
  "tempfile",
  "tokio",
  "ureq",
+ "uuid",
  "vergen",
  "walkdir",
  "whoami",

meilisearch-http/Cargo.toml

@@ -51,6 +51,7 @@ tar = "0.4.30"
 tempfile = "3.1.0"
 tokio = { version = "0.2", features = ["macros"] }
 ureq = { version = "2.0.0", features = ["tls"], default-features = false }
+uuid = "0.8"
 walkdir = "2.3.1"
 whoami = "1.0.3"
 

meilisearch-http/src/helpers/compression.rs

@@ -1,19 +1,27 @@
 use flate2::Compression;
 use flate2::read::GzDecoder;
 use flate2::write::GzEncoder;
-use std::fs::{create_dir_all, File};
+use std::fs::{create_dir_all, rename, File};
 use std::path::Path;
 use tar::{Builder, Archive};
+use uuid::Uuid;
 
 use crate::error::Error;
 
 pub fn to_tar_gz(src: &Path, dest: &Path) -> Result<(), Error> {
-    let f = File::create(dest)?;
+    let file_name = format!(".{}", Uuid::new_v4().to_urn());
+    let p = dest.with_file_name(file_name);
+    let tmp_dest = p.as_path();
+
+    let f = File::create(tmp_dest)?;
     let gz_encoder = GzEncoder::new(f, Compression::default());
     let mut tar_encoder = Builder::new(gz_encoder);
     tar_encoder.append_dir_all(".", src)?;
     let gz_encoder = tar_encoder.into_inner()?;
     gz_encoder.finish()?;
+
+    rename(tmp_dest, dest)?;
+
     Ok(())
 }