Call Delve using exec() instead of "dlv attach".
"dlv attach":
- Spams the terminal
- Requires sysctl -w kernel.yama.ptrace_scope=0
- Apparently, does not allow the debugger to inspect variables
Test: Manual.
Change-Id: I625369effaf5abda2b5d884c8ce5bde7247774eb
diff --git a/android/env.go b/android/env.go
index 46bd3d6..c7c96d5 100644
--- a/android/env.go
+++ b/android/env.go
@@ -15,9 +15,11 @@
package android
import (
+ "fmt"
"os"
"os/exec"
"strings"
+ "syscall"
"android/soong/env"
)
@@ -30,28 +32,59 @@
// a manifest regeneration.
var originalEnv map[string]string
-var SoongDelveListen string
-var SoongDelvePath string
+var soongDelveListen string
+var soongDelvePath string
+var soongDelveEnv []string
func init() {
// Delve support needs to read this environment variable very early, before NewConfig has created a way to
// access originalEnv with dependencies. Store the value where soong_build can find it, it will manually
// ensure the dependencies are created.
- SoongDelveListen = os.Getenv("SOONG_DELVE")
- SoongDelvePath, _ = exec.LookPath("dlv")
+ soongDelveListen = os.Getenv("SOONG_DELVE")
+ soongDelvePath, _ = exec.LookPath("dlv")
originalEnv = make(map[string]string)
+ soongDelveEnv = []string{}
for _, env := range os.Environ() {
idx := strings.IndexRune(env, '=')
if idx != -1 {
originalEnv[env[:idx]] = env[idx+1:]
+ if env[:idx] != "SOONG_DELVE" {
+ soongDelveEnv = append(soongDelveEnv, env)
+ }
}
}
+
// Clear the environment to prevent use of os.Getenv(), which would not provide dependencies on environment
// variable values. The environment is available through ctx.Config().Getenv, ctx.Config().IsEnvTrue, etc.
os.Clearenv()
}
+func ReexecWithDelveMaybe() {
+ if soongDelveListen == "" {
+ return
+ }
+
+ if soongDelvePath == "" {
+ fmt.Fprintln(os.Stderr, "SOONG_DELVE is set but failed to find dlv")
+ os.Exit(1)
+ }
+ dlvArgv := []string{
+ soongDelvePath,
+ "--listen=:" + soongDelveListen,
+ "--headless=true",
+ "--api-version=2",
+ "exec",
+ os.Args[0],
+ "--",
+ }
+ dlvArgv = append(dlvArgv, os.Args[1:]...)
+ os.Chdir(absSrcDir)
+ syscall.Exec(soongDelvePath, dlvArgv, soongDelveEnv)
+ fmt.Fprintln(os.Stderr, "exec() failed while trying to reexec with Delve")
+ os.Exit(1)
+}
+
// getenv checks either os.Getenv or originalEnv so that it works before or after the init()
// function above. It doesn't add any dependencies on the environment variable, so it should
// only be used for values that won't change. For values that might change use ctx.Config().Getenv.
diff --git a/cmd/soong_build/main.go b/cmd/soong_build/main.go
index bd1a9ed..905f206 100644
--- a/cmd/soong_build/main.go
+++ b/cmd/soong_build/main.go
@@ -18,12 +18,7 @@
"flag"
"fmt"
"os"
- "os/exec"
"path/filepath"
- "strconv"
- "strings"
- "syscall"
- "time"
"github.com/google/blueprint/bootstrap"
@@ -55,42 +50,7 @@
}
func main() {
- if android.SoongDelveListen != "" {
- if android.SoongDelvePath == "" {
- fmt.Fprintln(os.Stderr, "SOONG_DELVE is set but failed to find dlv")
- os.Exit(1)
- }
- pid := strconv.Itoa(os.Getpid())
- cmd := []string{android.SoongDelvePath,
- "attach", pid,
- "--headless",
- "-l", android.SoongDelveListen,
- "--api-version=2",
- "--accept-multiclient",
- "--log",
- }
-
- fmt.Println("Starting", strings.Join(cmd, " "))
- dlv := exec.Command(cmd[0], cmd[1:]...)
- dlv.Stdout = os.Stdout
- dlv.Stderr = os.Stderr
- dlv.Stdin = nil
-
- // Put dlv into its own process group so we can kill it and the child process it starts.
- dlv.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
-
- err := dlv.Start()
- if err != nil {
- // Print the error starting dlv and continue.
- fmt.Println(err)
- } else {
- // Kill the process group for dlv when soong_build exits.
- defer syscall.Kill(-dlv.Process.Pid, syscall.SIGKILL)
- // Wait to give dlv a chance to connect and pause the process.
- time.Sleep(time.Second)
- }
- }
-
+ android.ReexecWithDelveMaybe()
flag.Parse()
// The top-level Blueprints file is passed as the first argument.