vendor: update psgo to v1.3.0

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

vendor/github.com/containers/psgo/internal/proc/ns.go

@@ -15,10 +15,20 @@
 package proc
 
 import (
+	"bufio"
 	"fmt"
+	"io"
 	"os"
+
+	"github.com/pkg/errors"
 )
 
+type IDMap struct {
+	ContainerID int
+	HostID      int
+	Size        int
+}
+
 // ParsePIDNamespace returns the content of /proc/$pid/ns/pid.
 func ParsePIDNamespace(pid string) (string, error) {
 	pidNS, err := os.Readlink(fmt.Sprintf("/proc/%s/ns/pid", pid))
@@ -36,3 +46,34 @@ func ParseUserNamespace(pid string) (string, error) {
 	}
 	return userNS, nil
 }
+
+// ReadMappings reads the user namespace mappings at the specified path
+func ReadMappings(path string) ([]IDMap, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, errors.Wrapf(err, "cannot open %s", path)
+	}
+	defer file.Close()
+
+	mappings := []IDMap{}
+
+	buf := bufio.NewReader(file)
+	for {
+		line, _, err := buf.ReadLine()
+		if err != nil {
+			if err == io.EOF {
+				return mappings, nil
+			}
+			return nil, errors.Wrapf(err, "cannot read line from %s", path)
+		}
+		if line == nil {
+			return mappings, nil
+		}
+
+		containerID, hostID, size := 0, 0, 0
+		if _, err := fmt.Sscanf(string(line), "%d %d %d", &containerID, &hostID, &size); err != nil {
+			return nil, errors.Wrapf(err, "cannot parse %s", string(line))
+		}
+		mappings = append(mappings, IDMap{ContainerID: containerID, HostID: hostID, Size: size})
+	}
+}