Create uid/gid convertion function.

Create separate function to convert user ID / group ID of a user to integer.
Windows is a stub, since this doesn't work on Windows (uid/gid is not a number).

lock.go

@@ -5,7 +5,6 @@ import (
 	"os"
 	"os/signal"
 	"os/user"
-	"strconv"
 	"sync"
 	"syscall"
 	"time"
@@ -117,15 +116,8 @@ func (l *Lock) fillUserInfo() error {
 	}
 	l.Username = usr.Username
 
-	// We ignore the error. On Windows Uid is not a number
-	uid, _ := strconv.ParseInt(usr.Uid, 10, 32)
-	l.UID = uint32(uid)
-
-	// We ignore the error. On Windows Gid is not a number
-	gid, _ := strconv.ParseInt(usr.Gid, 10, 32)
-	l.GID = uint32(gid)
-
-	return nil
+	l.UID, l.GID, err = uidGidInt(*usr)
+	return err
 }
 
 // checkForOtherLocks looks for other locks that currently exist in the repository.

lock_unix.go

@@ -0,0 +1,24 @@
+// +build !windows
+
+package restic
+
+import (
+	"os/user"
+	"strconv"
+)
+
+// uidGidInt returns uid, gid of the user as a number.
+func uidGidInt(u user.User) (uid, gid uint32, err error) {
+	var ui, gi int
+	ui, err = strconv.ParseInt(u.Uid, 10, 32)
+	if err != nil {
+		return
+	}
+	gi, err = strconv.ParseInt(u.Gid, 10, 32)
+	if err != nil {
+		return
+	}
+	uid = uint32(ui)
+	gid = uint32(gi)
+	return
+}

lock_windows.go

@@ -0,0 +1,10 @@
+package restic
+
+import (
+	"os/user"
+)
+
+// uidGidInt always returns 0 on Windows, since uid isn't numbers
+func uidGidInt(u user.User) (uid, gid uint32, err error) {
+	return 0, 0, nil
+}

snapshot.go

@@ -5,7 +5,6 @@ import (
 	"os"
 	"os/user"
 	"path/filepath"
-	"strconv"
 	"time"
 
 	"github.com/restic/restic/backend"
@@ -76,15 +75,9 @@ func (sn *Snapshot) fillUserInfo() error {
 	}
 	sn.Username = usr.Username
 
-	// We ignore the error. On Windows Uid is not a number
-	uid, _ := strconv.ParseInt(usr.Uid, 10, 32)
-	sn.UID = uint32(uid)
-
-	// We ignore the error. On Windows Gid is not a number
-	gid, _ := strconv.ParseInt(usr.Gid, 10, 32)
-	sn.GID = uint32(gid)
-
-	return nil
+	// set userid and groupid
+	sn.UID, sn.GID, err = uidGidInt(*usr)
+	return err
 }
 
 // FindSnapshot takes a string and tries to find a snapshot whose ID matches