internal/pkg: known checksum exec artifact

This optionally attaches an output checksum to an execArtifact and enables host networking for the resulting container.

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

internal/pkg/testdata/main.go

@@ -16,7 +16,13 @@ func main() {
 	log.SetFlags(0)
 	log.SetPrefix("testtool: ")
 
-	if wantArgs := []string{"testtool"}; !slices.Equal(os.Args, wantArgs) {
+	var hostNet bool
+	wantArgs := []string{"testtool"}
+	if len(os.Args) == 2 {
+		hostNet = true
+		wantArgs = []string{"testtool", "net"}
+	}
+	if !slices.Equal(os.Args, wantArgs) {
 		log.Fatalf("Args: %q, want %q", os.Args, wantArgs)
 	}
 	if wantEnv := []string{
@@ -31,6 +37,22 @@ func main() {
 		log.Fatalf("Executable: %q, want %q", got, wantExec)
 	}
 
+	wantHostname := "cure"
+	if hostNet {
+		wantHostname += "-net"
+	}
+
+	if hostname, err := os.Hostname(); err != nil {
+		log.Fatalf("Hostname: error = %v", err)
+	} else if hostname != wantHostname {
+		log.Fatalf("Hostname: %q, want %q", hostname, wantHostname)
+	}
+
+	ident := "oHuqV7p0v1Vd8IdAzjyYM8sfCS0P2LR5tfv5cb6Gbf2ZWUm8Ec-7hYPJ_qr183m7"
+	if hostNet {
+		ident = "I3T53NtN6HPAyyodHtq2B0clcsoS1nPdvCEb-Zc5K-hoqFGL2od1mftHhwG7gX1S"
+	}
+
 	var m *vfs.MountInfo
 	if f, err := os.Open(fhs.Proc + "self/mountinfo"); err != nil {
 		log.Fatalf("Open: error = %v", err)
@@ -64,14 +86,12 @@ func main() {
 	next() // testtool artifact
 
 	next()
-	if path.Base(m.Root) !=
-		"oHuqV7p0v1Vd8IdAzjyYM8sfCS0P2LR5tfv5cb6Gbf2ZWUm8Ec-7hYPJ_qr183m7" || m.Target != "/work" {
+	if path.Base(m.Root) != ident || m.Target != "/work" {
 		log.Fatal("unexpected work mount entry")
 	}
 
 	next()
-	if path.Base(m.Root) !=
-		"oHuqV7p0v1Vd8IdAzjyYM8sfCS0P2LR5tfv5cb6Gbf2ZWUm8Ec-7hYPJ_qr183m7" || m.Target != "/tmp" {
+	if path.Base(m.Root) != ident || m.Target != "/tmp" {
 		log.Fatal("unexpected temp mount entry")
 	}
 
@@ -97,7 +117,11 @@ func main() {
 		os.Exit(1)
 	}
 
-	if err := os.WriteFile("check", []byte{0}, 0400); err != nil {
+	checkData := []byte{0}
+	if hostNet {
+		checkData = []byte("net")
+	}
+	if err := os.WriteFile("check", checkData, 0400); err != nil {
 		log.Fatal(err)
 	}
 }