feat(app): resolve daemon self-exec path per OS

commit: eba0b225d67a9af0e00f9972799e309ea0eb2c60
author: brice · 3mo ago · 2026-07-16 17:43 UTC
parent: d2d212f
signature: GPG VerifiedCD88F9E564E0102646FB6077A1A07C7C7C3E349D · arch-gpg Verified for the committer email

4 files · +37 -1

A internal/app/selfexe_darwin.go +9 -0

@@ -0,0 +1,9 @@
	1	+	//go:build darwin
	2	+
	3	+	package app
	4	+
	5	+	import "os"
	6	+
	7	+	func selfExePath() (string, error) {
	8	+	return os.Executable()
	9	+	}

@@ -0,0 +1,9 @@
	1	+	//go:build darwin
	2	+
	3	+	package app
	4	+
	5	+	import "os"
	6	+
	7	+	func selfExePath() (string, error) {
	8	+	return os.Executable()
	9	+	}

A internal/app/selfexe_linux.go +7 -0

@@ -0,0 +1,7 @@
	1	+	//go:build linux
	2	+
	3	+	package app
	4	+
	5	+	func selfExePath() (string, error) {
	6	+	return "/proc/self/exe", nil
	7	+	}

@@ -0,0 +1,7 @@
	1	+	//go:build linux
	2	+
	3	+	package app
	4	+
	5	+	func selfExePath() (string, error) {
	6	+	return "/proc/self/exe", nil
	7	+	}

A internal/app/selfexe_linux_test.go +15 -0

@@ -0,0 +1,15 @@
	1	+	//go:build linux
	2	+
	3	+	package app
	4	+
	5	+	import "testing"
	6	+
	7	+	func TestSelfExePath(t *testing.T) {
	8	+	got, err := selfExePath()
	9	+	if err != nil {
	10	+	t.Fatalf("selfExePath: %v", err)
	11	+	}
	12	+	if got != "/proc/self/exe" {
	13	+	t.Fatalf("selfExePath = %q, want %q", got, "/proc/self/exe")
	14	+	}
	15	+	}

@@ -0,0 +1,15 @@
	1	+	//go:build linux
	2	+
	3	+	package app
	4	+
	5	+	import "testing"
	6	+
	7	+	func TestSelfExePath(t *testing.T) {
	8	+	got, err := selfExePath()
	9	+	if err != nil {
	10	+	t.Fatalf("selfExePath: %v", err)
	11	+	}
	12	+	if got != "/proc/self/exe" {
	13	+	t.Fatalf("selfExePath = %q, want %q", got, "/proc/self/exe")
	14	+	}
	15	+	}

M internal/app/spawn.go +6 -1


@@ -157,13 +157,18 @@ func realDial(ctx context.Context, dir string) (ports.Transport, error) {
157	157		// and never writes to the client's terminal. It logs via slog to the shared
158	158		// log file instead.
159	159		func realSpawn() error {
	160	+	exePath, err := selfExePath()
	161	+	if err != nil {
	162	+	return fmt.Errorf("resolving executable path: %w", err)
	163	+	}
	164	+
160	165		devNull, err := os.OpenFile(os.DevNull, os.O_RDWR, 0)
161	166		if err != nil {
162	167		return fmt.Errorf("opening %s: %w", os.DevNull, err)
163	168		}
164	169		defer func() { _ = devNull.Close() }()
165	170
166		-	cmd := exec.Command("/proc/self/exe", "--daemon")
	171	+	cmd := exec.Command(exePath, "--daemon")
167	172		cmd.Dir = platform.DirOrHome("")
168	173		cmd.Stdin = devNull
169	174		cmd.Stdout = devNull

 // and never writes to the client's terminal. It logs via slog to the shared
 // log file instead.
 func realSpawn() error {
+	exePath, err := selfExePath()
+	if err != nil {
+		return fmt.Errorf("resolving executable path: %w", err)
+	}
 	devNull, err := os.OpenFile(os.DevNull, os.O_RDWR, 0)
 	if err != nil {
 		return fmt.Errorf("opening %s: %w", os.DevNull, err)
 	}
 	defer func() { _ = devNull.Close() }()
-	cmd := exec.Command("/proc/self/exe", "--daemon")
+	cmd := exec.Command(exePath, "--daemon")
 	cmd.Dir = platform.DirOrHome("")
 	cmd.Stdin = devNull
 	cmd.Stdout = devNull