From a381e8672cb8f09fc13e9aa43b9d91cc6e2bdd1b Mon Sep 17 00:00:00 2001
From: Evgeny Khirin <32414982+evgeny-khirin@users.noreply.github.com>
Date: Sun, 17 Mar 2019 11:55:40 +0200
Subject: [PATCH] [NOD-4] Exit on out of disk space when storing a block (#211)

* [NOD-4] Exit on out of disk space when storing a block

* [NOD-4] Fixed log message

* [NOD-4] Fixed log message

* [NOD-4] Fixed log message
---
 config/config.go            | 2 +-
 database/ffldb/blockio.go   | 5 +++++
 mining/cpuminer/cpuminer.go | 2 +-
 3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/config/config.go b/config/config.go
index acb747283..888adc45d 100644
--- a/config/config.go
+++ b/config/config.go
@@ -764,7 +764,7 @@ func loadConfig() (*Config, []string, error) {
 	}
 
 	// Check that 'generate' and 'subnetwork' flags do not conflict
-	if cfg.Generate && cfg.SubnetworkID.IsEqual(subnetworkid.SubnetworkIDSupportsAll) {
+	if cfg.Generate && !cfg.SubnetworkID.IsEqual(subnetworkid.SubnetworkIDSupportsAll) {
 		str := "%s: both generate flag and subnetwork filtering are set "
 		err := fmt.Errorf(str, funcName)
 		fmt.Fprintln(os.Stderr, err)
diff --git a/database/ffldb/blockio.go b/database/ffldb/blockio.go
index d7c8b3856..246fa1d9e 100644
--- a/database/ffldb/blockio.go
+++ b/database/ffldb/blockio.go
@@ -16,6 +16,7 @@ import (
 	"os"
 	"path/filepath"
 	"sync"
+	"syscall"
 
 	"github.com/daglabs/btcd/dagconfig/daghash"
 	"github.com/daglabs/btcd/database"
@@ -385,6 +386,10 @@ func (s *blockStore) writeData(data []byte, fieldName string) error {
 	n, err := wc.curFile.file.WriteAt(data, int64(wc.curOffset))
 	wc.curOffset += uint32(n)
 	if err != nil {
+		if pathErr, isOk := err.(*os.PathError); isOk && pathErr.Err == syscall.ENOSPC {
+			log.Errorf("No space left on the hard disk, exiting...")
+			os.Exit(1)
+		}
 		str := fmt.Sprintf("failed to write %s to file %d at "+
 			"offset %d: %s", fieldName, wc.curFileNum,
 			wc.curOffset-uint32(n), err)
diff --git a/mining/cpuminer/cpuminer.go b/mining/cpuminer/cpuminer.go
index d3f2f122e..95233c7bd 100644
--- a/mining/cpuminer/cpuminer.go
+++ b/mining/cpuminer/cpuminer.go
@@ -436,7 +436,7 @@ func (m *CPUMiner) Start() {
 	go m.miningWorkerController()
 
 	m.started = true
-	log.Infof("CPU miner started")
+	log.Infof("CPU miner started, number of workers %d", m.numWorkers)
 }
 
 // Stop gracefully stops the mining process by signalling all workers, and the