internal/rosa/etc: resolv.conf

Required by programs that download from the internet in measured execArtifact.

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

internal/rosa/etc.go

@@ -4,8 +4,10 @@ import (
 	"errors"
 	"io"
 	"os"
+	"sync"
 	"syscall"
 
+	"hakurei.app/container/fhs"
 	"hakurei.app/internal/pkg"
 )
 
@@ -140,3 +142,22 @@ func newIANAEtc() pkg.Artifact {
 		pkg.TarGzip,
 	)
 }
+
+var (
+	resolvconfPath pkg.ExecPath
+	resolvconfOnce sync.Once
+)
+
+// resolvconf returns a hardcoded /etc/resolv.conf file.
+func resolvconf() pkg.ExecPath {
+	resolvconfOnce.Do(func() {
+		resolvconfPath = pkg.Path(
+			fhs.AbsEtc.Append("resolv.conf"), false,
+			pkg.NewFile("resolv.conf", []byte(`
+nameserver 1.1.1.1
+nameserver 1.0.0.1
+`)),
+		)
+	})
+	return resolvconfPath
+}