feat: add instrumented go shell script

src/run/runner/wall_time/executor.rs

@@ -6,6 +6,7 @@ use crate::run::runner::executor::Executor;
 use crate::run::runner::helpers::env::{get_base_injected_env, is_codspeed_debug_enabled};
 use crate::run::runner::helpers::get_bench_command::get_bench_command;
 use crate::run::runner::helpers::run_command_with_log_pipe::run_command_with_log_pipe;
+use crate::run::runner::wall_time::introspected_golang::setup_introspected_go;
 use crate::run::runner::{ExecutorName, RunData};
 use crate::run::{check_system::SystemInfo, config::Config};
 use async_trait::async_trait;
@@ -106,7 +107,18 @@ impl WallTimeExecutor {
                 .map(|(k, v)| format!("export {k}={v}",))
                 .collect::<Vec<_>>()
                 .join("\n");
-        let combined_env = format!("{system_env}\n{base_injected_env}");
+
+        // We need to intercept the `go` command to ensure we can run it with our custom runner.
+        let path_env = std::env::var("PATH").unwrap_or_default();
+        let path_env = format!(
+            "export PATH={}:{}",
+            setup_introspected_go()
+                .map_err(|e| anyhow!("failed to setup Go introspection. {}", e))?
+                .to_string_lossy(),
+            path_env
+        );
+
+        let combined_env = format!("{system_env}\n{base_injected_env}\n{path_env}");
 
         let mut env_file = NamedTempFile::new()?;
         env_file.write_all(combined_env.as_bytes())?;

src/run/runner/wall_time/introspected_golang/go.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+debug_log() {
+    if [ "${CODSPEED_LOG:-}" = "debug" ]; then
+        echo "[DEBUG go.sh] $*" >&2
+    fi
+}
+
+debug_log "Called with arguments: $*"
+debug_log "Number of arguments: $#"
+
+# Find the real go binary, so that we don't end up in infinite recursion
+REAL_GO=$(which -a go | grep -v "$(realpath "$0")" | head -1)
+if [ -z "$REAL_GO" ]; then
+    echo "ERROR: Could not find real go binary" >&2
+    exit 1
+fi
+
+# Check if we have any arguments
+if [ $# -eq 0 ]; then
+    debug_log "No arguments provided, using standard go binary"
+    "$REAL_GO"
+    exit $?
+fi
+
+# Check if first argument is "test"
+if [ "$1" = "test" ]; then
+    debug_log "Detected 'test' command, routing to go-runner"
+
+    # Find go-runner or install if not found
+    GO_RUNNER=$(which go-runner 2>/dev/null || true)
+    if [ -z "$GO_RUNNER" ]; then
+        curl -fsSL http://github.com/CodSpeedHQ/runner/releases/latest/download/go-runner-installer.sh | bash -s -- --quiet
+        GO_RUNNER=$(which go-runner 2>/dev/null || true)
+    fi
+
+    debug_log "Using go-runner at: $GO_RUNNER"
+    debug_log "Full command: RUST_LOG=info $GO_RUNNER $*"
+
+    "$GO_RUNNER" "$@"
+else
+    debug_log "Detected non-test command ('$1'), routing to standard go binary"
+    debug_log "Full command: $REAL_GO $*"
+    "$REAL_GO" "$@"
+fi

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

@@ -0,0 +1,19 @@
+use crate::prelude::*;
+use std::{env, fs::File, io::Write, os::unix::fs::PermissionsExt, path::PathBuf};
+
+const INTROSPECTED_GO_SCRIPT: &str = include_str!("go.sh");
+
+/// Creates the `go` script that will replace the `go` binary while running
+/// Returns the path to the script folder, which should be added to the PATH environment variable
+pub fn setup_introspected_go() -> Result<PathBuf> {
+    let script_folder = env::temp_dir().join("codspeed_introspected_go");
+    std::fs::create_dir_all(&script_folder)?;
+    let script_path = script_folder.join("go");
+    let mut script_file = File::create(script_path)?;
+    script_file.write_all(INTROSPECTED_GO_SCRIPT.as_bytes())?;
+    // Make the script executable
+    let mut perms = script_file.metadata()?.permissions();
+    perms.set_mode(0o755);
+    script_file.set_permissions(perms)?;
+    Ok(script_folder)
+}

src/run/runner/wall_time/mod.rs

@@ -1,2 +1,3 @@
 pub mod executor;
+pub mod introspected_golang;
 pub mod perf;