bastion 0.54.0

client-go/mcpconfig_linux_test.go

@@ -0,0 +1,38 @@
+//go:build linux
+
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"syscall"
+	"testing"
+	"time"
+)
+
+// A FIFO left where a client keeps its config must not hold the read, and
+// with it the heartbeat: it is counted unreadable and the scan moves on.
+func TestReadMCPConfigsDoesNotBlockOnAFIFO(t *testing.T) {
+	home := t.TempDir()
+	if err := os.MkdirAll(filepath.Join(home, ".cursor"), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := syscall.Mkfifo(filepath.Join(home, ".cursor", "mcp.json"), 0o600); err != nil {
+		t.Skipf("cannot make a FIFO here: %v", err)
+	}
+	oldH, oldS := mcpHomesFn, mcpSystemFn
+	t.Cleanup(func() { mcpHomesFn, mcpSystemFn = oldH, oldS })
+	mcpHomesFn = func() ([]mcpHome, bool) { return []mcpHome{{Dir: home, ConfigDir: home}}, true }
+	mcpSystemFn = func() []mcpSource { return nil }
+
+	done := make(chan mcpConfigScan, 1)
+	go func() { _, scan := readMCPConfigs(); done <- scan }()
+	select {
+	case scan := <-done:
+		if scan.Unreadable != 1 {
+			t.Fatalf("the FIFO was not counted: %+v", scan)
+		}
+	case <-time.After(5 * time.Second):
+		t.Fatal("reading the config files blocked on a FIFO")
+	}
+}