Build on alpine, synchronize file right after writing chunk

Author: 0xf104a

Dockerfile

@@ -1,15 +1,19 @@
-FROM rust:latest AS builder
+FROM alpine:latest AS builder
 LABEL authors="Anna-Sophie Zaitsewa"
 
+RUN apk add rust cargo
+
 RUN mkdir /tmp/pcp
 WORKDIR /tmp/pcp
 COPY . .
+RUN mkdir .cargo
 
 RUN cargo build --release
 RUN cp /tmp/pcp/target/release/pretty-copy /usr/bin/pcp
 
 FROM alpine:latest
 LABEL authors="Anna-Sophie Zaitsewa"
 
+RUN apk add musl libgcc
 COPY --from=builder /usr/bin/pcp /usr/bin/pcp
 

src/writer/file.rs

@@ -91,10 +91,18 @@ impl Writer for FileWriter{
     }
 
     async fn write_chunk(&mut self, chunk: &DynBuffer, size: usize) -> std::io::Result<usize> {
-        if chunk.len() == size {
+        let write_result = if chunk.len() == size {
             self.file.write(chunk).await
         } else { //chunk.len() > size
             self.file.write(&chunk[0..size]).await
+        };
+        if write_result.is_err(){
+            return write_result;
+        }
+        let sync_result = self.file.sync_all().await;
+        if sync_result.is_err(){
+            return Err(std::io::Error::last_os_error());
         }
+        write_result
     }
 }