Merge pull request #122 from audebert/master

journal: implement GetUsage() (sd_journal_get_usage())

sdjournal/journal.go

@@ -237,3 +237,17 @@ func (j *Journal) Wait(timeout time.Duration) int {
 
 	return int(r)
 }
+
+// GetUsage returns the journal disk space usage, in bytes.
+func (j *Journal) GetUsage() (uint64, error) {
+	var out C.uint64_t
+	j.mu.Lock()
+	err := C.sd_journal_get_usage(j.cjournal, &out)
+	j.mu.Unlock()
+
+	if err != 0 {
+		return 0, fmt.Errorf("failed to get journal disk space usage: %d", err)
+	}
+
+	return uint64(out), nil
+}

sdjournal/journal_test.go

@@ -68,3 +68,23 @@ func TestJournalFollow(t *testing.T) {
 		t.Fatalf("Error during follow: %s", err)
 	}
 }
+
+func TestJournalGetUsage(t *testing.T) {
+	j, err := NewJournal()
+
+	if err != nil {
+		t.Fatalf("Error opening journal: %s", err)
+	}
+
+	if j == nil {
+		t.Fatal("Got a nil journal")
+	}
+
+	defer j.Close()
+
+	_, err = j.GetUsage()
+
+	if err != nil {
+		t.Fatalf("Error getting journal size: %s", err)
+	}
+}