zfs: Allow space in dataset name

Signed-off-by: Mustafa Khafateh <m@khafateh.com>

collector/fixtures/proc/spl/kstat/zfs/pool3/io

@@ -0,0 +1,3 @@
+12 3 0x00 1 80 79205351707403 395818011156865
+nread    nwritten reads    writes   wtime    wlentime wupdate  rtime    rlentime rupdate  wcnt     rcnt    
+1884160  3206144  22       132      7155162  104112268 79210489694949 24168078 104112268 79210489849220 0        0       

collector/fixtures/proc/spl/kstat/zfs/pool3/objset-1

@@ -0,0 +1,9 @@
+23 1 0x01 7 2160 221578688875 6665999035587
+name                            type data
+dataset_name                    7    pool1
+writes                          4    0
+nwritten                        4    0
+reads                           4    0
+nread                           4    0
+nunlinks                        4    0
+nunlinked                       4    0

collector/fixtures/proc/spl/kstat/zfs/pool3/objset-2

@@ -0,0 +1,9 @@
+24 1 0x01 7 2160 221611904716 7145015038451
+name                            type data
+dataset_name                    7    pool1/dataset with  space
+writes                          4    4
+nwritten                        4    12302
+reads                           4    2
+nread                           4    28
+nunlinks                        4    3
+nunlinked                       4    3

collector/fixtures/proc/spl/kstat/zfs/pool3/state

@@ -0,0 +1 @@
+ONLINE

collector/zfs_linux.go

@@ -301,7 +301,8 @@ func (c *zfsCollector) parsePoolObjsetFile(reader io.Reader, zpoolPath string, h
 	parseLine := false
 	var zpoolName, datasetName string
 	for scanner.Scan() {
-		parts := strings.Fields(scanner.Text())
+		line := scanner.Text()
+		parts := strings.Fields(line)
 
 		if !parseLine && len(parts) == 3 && parts[0] == "name" && parts[1] == "type" && parts[2] == "data" {
 			parseLine = true
@@ -315,7 +316,7 @@ func (c *zfsCollector) parsePoolObjsetFile(reader io.Reader, zpoolPath string, h
 			zpoolPathElements := strings.Split(zpoolPath, "/")
 			pathLen := len(zpoolPathElements)
 			zpoolName = zpoolPathElements[pathLen-2]
-			datasetName = parts[2]
+			datasetName = line[strings.Index(line, parts[2]):]
 			continue
 		}
 

collector/zfs_linux_test.go

@@ -315,6 +315,55 @@ func TestZpoolParsing(t *testing.T) {
 	}
 }
 
+func TestZpoolObjsetParsingWithSpace(t *testing.T) {
+	tests := []struct {
+		path            string
+		expectedDataset string
+	}{
+		{
+			path:            "fixtures/proc/spl/kstat/zfs/pool1/objset-1",
+			expectedDataset: "pool1",
+		},
+		{
+			path:            "fixtures/proc/spl/kstat/zfs/pool1/objset-2",
+			expectedDataset: "pool1/dataset1",
+		},
+		{
+			path:            "fixtures/proc/spl/kstat/zfs/pool3/objset-1",
+			expectedDataset: "pool1",
+		},
+		{
+			path:            "fixtures/proc/spl/kstat/zfs/pool3/objset-2",
+			expectedDataset: "pool1/dataset with  space",
+		},
+	}
+
+	c := zfsCollector{}
+
+	var handlerCalled bool
+	for _, test := range tests {
+		file, err := os.Open(test.path)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		handlerCalled = false
+		err = c.parsePoolObjsetFile(file, test.path, func(poolName string, datasetName string, s zfsSysctl, v uint64) {
+			handlerCalled = true
+			if test.expectedDataset != datasetName {
+				t.Fatalf("Incorrectly parsed dataset name: expected: '%s', got: '%s'", test.expectedDataset, datasetName)
+			}
+		})
+		file.Close()
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !handlerCalled {
+			t.Fatalf("Zpool parsing handler was not called for '%s'", test.path)
+		}
+	}
+}
+
 func TestZpoolObjsetParsing(t *testing.T) {
 	zpoolPaths, err := filepath.Glob("fixtures/proc/spl/kstat/zfs/*/objset-*")
 	if err != nil {