container: move out of toplevel

This allows slightly easier use of the vanity url. This also provides some disambiguation between low level containers and hakurei app containers.

Signed-off-by: Ophestra <cat@gensokyo.uk>

container/seccomp/seccomp.go

@@ -0,0 +1,60 @@
+// Package seccomp provides high level wrappers around libseccomp.
+package seccomp
+
+import (
+	"os"
+	"runtime"
+	"sync"
+)
+
+type exporter struct {
+	rules []NativeRule
+	flags ExportFlag
+	r, w  *os.File
+
+	prepareOnce sync.Once
+	prepareErr  error
+	closeOnce   sync.Once
+	closeErr    error
+	exportErr   <-chan error
+}
+
+func (e *exporter) prepare() error {
+	e.prepareOnce.Do(func() {
+		if r, w, err := os.Pipe(); err != nil {
+			e.prepareErr = err
+			return
+		} else {
+			e.r, e.w = r, w
+		}
+
+		ec := make(chan error, 1)
+		go func(fd uintptr) {
+			ec <- Export(int(fd), e.rules, e.flags)
+			close(ec)
+			_ = e.closeWrite()
+			runtime.KeepAlive(e.w)
+		}(e.w.Fd())
+		e.exportErr = ec
+		runtime.SetFinalizer(e, (*exporter).closeWrite)
+	})
+	return e.prepareErr
+}
+
+func (e *exporter) closeWrite() error {
+	e.closeOnce.Do(func() {
+		if e.w == nil {
+			panic("closeWrite called on invalid exporter")
+		}
+		e.closeErr = e.w.Close()
+
+		// no need for a finalizer anymore
+		runtime.SetFinalizer(e, nil)
+	})
+
+	return e.closeErr
+}
+
+func newExporter(rules []NativeRule, flags ExportFlag) *exporter {
+	return &exporter{rules: rules, flags: flags}
+}