fix(engine-dylib) Remove temporary file used to creating an artifact.

When creating an artifact, a first temporary file is created and kept
to prevent the file from being removed by the system. This patch
removes that temporary file manually whatever the linker fails or not.

CHANGELOG.md

@@ -9,20 +9,21 @@ Looking for changes that affect our C API? See the [C API Changelog](lib/c-api/C
 ## **[Unreleased]**
 
 ### Added
-- [#2427](https://github.com/wasmerio/wasmer/pull/2427) Wasmer can now compile to Javascript via `wasm-bindgen`. Use the `js-default` (and no default features) feature to try it!
-- [#2436](https://github.com/wasmerio/wasmer/pull/2436) Added the x86-32 bit variant support to LLVM compiler
+- [#2427](https://github.com/wasmerio/wasmer/pull/2427) Wasmer can now compile to Javascript via `wasm-bindgen`. Use the `js-default` (and no default features) feature to try it!.
+- [#2436](https://github.com/wasmerio/wasmer/pull/2436) Added the x86-32 bit variant support to LLVM compiler.
 
 ### Changed
-- [#2460](https://github.com/wasmerio/wasmer/pull/2460) **breaking change** `wasmer` API usage with `no-default-features` requires now the `sys` feature to preserve old behavior
-- [#2476](https://github.com/wasmerio/wasmer/pull/2476) Removed unncessary abstraction `ModuleInfoTranslate` from `wasmer-compiler`
-- [#2442](https://github.com/wasmerio/wasmer/pull/2442) Improved `WasmPtr`, added `WasmCell` for host/guest interaction
+- [#2460](https://github.com/wasmerio/wasmer/pull/2460) **breaking change** `wasmer` API usage with `no-default-features` requires now the `sys` feature to preserve old behavior.
+- [#2476](https://github.com/wasmerio/wasmer/pull/2476) Removed unncessary abstraction `ModuleInfoTranslate` from `wasmer-compiler`.
+- [#2442](https://github.com/wasmerio/wasmer/pull/2442) Improved `WasmPtr`, added `WasmCell` for host/guest interaction.
 - [#2427](https://github.com/wasmerio/wasmer/pull/2427) Update `loupe` to 0.1.3.
 - [#2478](https://github.com/wasmerio/wasmer/pull/2478) Rename `wasm_instance_new()`’s “traps” argument to “trap”.
 
 ### Fixed
-- [#2494](https://github.com/wasmerio/wasmer/pull/2494) Fixed `WasmerEnv` access when using `call_indirect` with the Singlepass compiler
-- [#2449](https://github.com/wasmerio/wasmer/pull/2449) Fixed `wasmer-c-api` used `soname`
-- [#2479](https://github.com/wasmerio/wasmer/pull/2479) Improved `wasmer validate` error message on non-wasm inputs
+- [#2518](https://github.com/wasmerio/wasmer/pull/2518) Remove temporary file used to creating an artifact when creating a Dylib engine artifact.
+- [#2494](https://github.com/wasmerio/wasmer/pull/2494) Fixed `WasmerEnv` access when using `call_indirect` with the Singlepass compiler.
+- [#2449](https://github.com/wasmerio/wasmer/pull/2449) Fixed `wasmer-c-api` used `soname`.
+- [#2479](https://github.com/wasmerio/wasmer/pull/2479) Improved `wasmer validate` error message on non-wasm inputs.
 - [#2454](https://github.com/wasmerio/wasmer/issues/2454) Won't set `WASMER_CACHE_DIR` for Windows.
 - [#2426](https://github.com/wasmerio/wasmer/pull/2426) Fix the `wax` script generation.
 

lib/engine-dylib/src/artifact.rs

@@ -6,7 +6,7 @@ use crate::serialize::{ArchivedModuleMetadata, ModuleMetadata};
 use libloading::{Library, Symbol as LibrarySymbol};
 use loupe::MemoryUsage;
 use std::error::Error;
-use std::fs::File;
+use std::fs::{self, File};
 use std::io::{Read, Write};
 use std::path::{Path, PathBuf};
 #[cfg(feature = "compiler")]
@@ -59,7 +59,7 @@ pub struct DylibArtifact {
 }
 
 fn to_compile_error(err: impl Error) -> CompileError {
-    CompileError::Codegen(format!("{}", err))
+    CompileError::Codegen(err.to_string())
 }
 
 const WASMER_METADATA_SYMBOL: &[u8] = b"WASMER_METADATA";
@@ -266,7 +266,7 @@ impl DylibArtifact {
             }
         };
 
-        let shared_filepath = {
+        let output_filepath = {
             let suffix = format!(".{}", Self::get_default_extension(&target_triple));
             let shared_file = tempfile::Builder::new()
                 .prefix("wasmer_dylib_")
@@ -322,14 +322,20 @@ impl DylibArtifact {
         let output = Command::new(linker)
             .arg(&filepath)
             .arg("-o")
-            .arg(&shared_filepath)
+            .arg(&output_filepath)
             .args(&target_args)
             // .args(&wasmer_symbols)
             .arg("-shared")
             .args(&cross_compiling_args)
             .arg("-v")
             .output()
-            .map_err(to_compile_error)?;
+            .map_err(to_compile_error);
+
+        if fs::metadata(filepath).is_ok() {
+            fs::remove_file(filepath).map_err(to_compile_error)?;
+        }
+
+        let output = output?;
 
         if !output.status.success() {
             return Err(CompileError::Codegen(format!(
@@ -338,12 +344,14 @@ impl DylibArtifact {
                 String::from_utf8_lossy(&output.stdout).trim_end()
             )));
         }
+
         trace!("gcc command result {:?}", output);
+
         if is_cross_compiling {
-            Self::from_parts_crosscompiled(metadata, shared_filepath)
+            Self::from_parts_crosscompiled(metadata, output_filepath)
         } else {
-            let lib = unsafe { Library::new(&shared_filepath).map_err(to_compile_error)? };
-            Self::from_parts(&mut engine_inner, metadata, shared_filepath, lib)
+            let lib = unsafe { Library::new(&output_filepath).map_err(to_compile_error)? };
+            Self::from_parts(&mut engine_inner, metadata, output_filepath, lib)
         }
     }