feat: remove existing pipedata file if there are any

Author: GuillaumeLagrange

src/run/runner/wall_time/perf/mod.rs

@@ -90,6 +90,12 @@ impl PerfRunner {
         mut cmd_builder: CommandBuilder,
         config: &Config,
     ) -> anyhow::Result<ExitStatus> {
+        if Path::new(PERF_DATA_PATH).exists() {
+            std::fs::rename(PERF_DATA_PATH, format!("{PERF_DATA_PATH}.old")).with_context(
+                || format!("Failed to move existing perf data file at {PERF_DATA_PATH}",),
+            )?;
+        }
+
         let perf_fifo = PerfFifo::new()?;
         let runner_fifo = RunnerFifo::new()?;
 
@@ -144,9 +150,11 @@ impl PerfRunner {
             "--",
         ]);
         cmd_builder.wrap_with(perf_wrapper_builder);
-        cmd_builder.args(["|", "cat", ">", PERF_DATA_PATH]);
-        let cmd = wrap_with_sudo(cmd_builder)?.build();
-        debug!("cmd: {cmd:?}");
+        let raw_command = format!("{} | cat > PERF_DATA_PATH", &cmd_builder.as_command_line());
+        let mut wrapped_builder = CommandBuilder::new("sh");
+        wrapped_builder.args(["-c", &raw_command]);
+        let cmd = wrap_with_sudo(wrapped_builder)?.build();
+        println!("cmd: {cmd:?}");
 
         let on_process_started = async |_| -> anyhow::Result<()> {
             let data = Self::handle_fifo(runner_fifo, perf_fifo).await?;