cmd/mbf: abort remote cures

This command arranges for all pending cures to be aborted. It does not wait for cures to complete.

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

cmd/mbf/daemon.go

@@ -70,6 +70,9 @@ const (
 	// specialCancel is a message consisting of a single identifier referring
 	// to a curing artifact to be cancelled.
 	specialCancel = iota
+	// specialAbort requests for all pending cures to be aborted. It has no
+	// message body.
+	specialAbort
 
 	// remoteSpecial denotes a special message with custom layout.
 	remoteSpecial = math.MaxUint64
@@ -189,6 +192,10 @@ func serve(
 								pkg.Encode(*id),
 							)
 						}
+
+					case specialAbort:
+						log.Println("aborting all pending cures")
+						cm.c.Abort()
 					}
 
 					return
@@ -291,7 +298,7 @@ func cureRemote(
 	return p, err
 }
 
-// cureRemote cancels a [pkg.Artifact] curing on a daemon.
+// cancelRemote cancels a [pkg.Artifact] curing on a daemon.
 func cancelRemote(
 	ctx context.Context,
 	addr *net.UnixAddr,
@@ -316,3 +323,18 @@ func cancelRemote(
 	}
 	return conn.Close()
 }
+
+// abortRemote aborts all [pkg.Artifact] curing on a daemon.
+func abortRemote(
+	ctx context.Context,
+	addr *net.UnixAddr,
+) error {
+	done, conn, err := dial(ctx, addr)
+	if err != nil {
+		return err
+	}
+	defer close(done)
+
+	err = writeSpecialHeader(conn, specialAbort)
+	return errors.Join(err, conn.Close())
+}

cmd/mbf/daemon_test.go

@@ -110,6 +110,10 @@ func TestDaemon(t *testing.T) {
 		t.Fatalf("cancelRemote: error = %v", err)
 	}
 
+	if err = abortRemote(ctx, &addr); err != nil {
+		t.Fatalf("abortRemote: error = %v", err)
+	}
+
 	// keep this last for synchronisation
 	var p *check.Absolute
 	p, err = cureRemote(ctx, &addr, pkg.NewFile("check", []byte{0}), 0)
@@ -127,6 +131,7 @@ func TestDaemon(t *testing.T) {
 
 	wantLog := []string{
 		"",
+		"daemon: aborting all pending cures",
 		"daemon: attempting to cancel invalid artifact kQm9fmnCmXST1-MMmxzcau2oKZCXXrlZydo4PkeV5hO_2PKfeC8t98hrbV_ZZx_j",
 		"daemon: fulfilled artifact fiZf-ZY_Yq6qxJNrHbMiIPYCsGkUiKCRsZrcSELXTqZWtCnESlHmzV5ThhWWGGYG",
 	}

cmd/mbf/main.go

@@ -520,6 +520,12 @@ func main() {
 		)
 	}
 
+	c.NewCommand(
+		"abort",
+		"Abort all pending cures on the daemon",
+		func([]string) error { return abortRemote(ctx, &addr) },
+	)
+
 	{
 		var (
 			flagNet     bool