Use Go 1.13 error features

* Use `errors.Is()` for unwrapping errors.
* Use `%w` error verb in internal error formatting.

Signed-off-by: Ben Kochie <superq@gmail.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/collector/logind_linux.go b/collector/logind_linux.go
index fb3cb57..19a29a2 100644
--- a/collector/logind_linux.go
+++ b/collector/logind_linux.go
@@ -92,7 +92,7 @@ func NewLogindCollector(logger log.Logger) (Collector, error) {
 func (lc *logindCollector) Update(ch chan<- prometheus.Metric) error {
         c, err := newDbus()
         if err != nil {
-                return fmt.Errorf("unable to connect to dbus: %s", err)
+                return fmt.Errorf("unable to connect to dbus: %w", err)
         }
         defer c.conn.Close()
 
@@ -102,12 +102,12 @@ func (lc *logindCollector) Update(ch chan<- prometheus.Metric) error {
 func collectMetrics(ch chan<- prometheus.Metric, c logindInterface) error {
         seats, err := c.listSeats()
         if err != nil {
-                return fmt.Errorf("unable to get seats: %s", err)
+                return fmt.Errorf("unable to get seats: %w", err)
         }
 
         sessionList, err := c.listSessions()
         if err != nil {
-                return fmt.Errorf("unable to get sessions: %s", err)
+                return fmt.Errorf("unable to get sessions: %w", err)
         }
 
         sessions := make(map[logindSession]float64)