From ace53bbe65d1384893027d046a5d4eae83bd60af Mon Sep 17 00:00:00 2001
From: Elena Morozova <lelenanam@gmail.com>
Date: Thu, 13 Oct 2016 13:55:38 -0700
Subject: [PATCH] all: remove nil check for slices

Signed-off-by: Elena Morozova <lelenanam@gmail.com>
---
 api/types/filters/parse.go   | 2 +-
 pkg/archive/archive_linux.go | 2 +-
 pkg/archive/changes_linux.go | 2 +-
 pkg/discovery/backends.go    | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/api/types/filters/parse.go b/api/types/filters/parse.go
index 12e5a3b0d5..b0aa824618 100644
--- a/api/types/filters/parse.go
+++ b/api/types/filters/parse.go
@@ -165,7 +165,7 @@ func (filters Args) MatchKVList(field string, sources map[string]string) bool {
 		return true
 	}
 
-	if sources == nil || len(sources) == 0 {
+	if len(sources) == 0 {
 		return false
 	}
 
diff --git a/pkg/archive/archive_linux.go b/pkg/archive/archive_linux.go
index 5ec3ae1622..7426d725d5 100644
--- a/pkg/archive/archive_linux.go
+++ b/pkg/archive/archive_linux.go
@@ -36,7 +36,7 @@ func (overlayWhiteoutConverter) ConvertWrite(hdr *tar.Header, path string, fi os
 		if err != nil {
 			return err
 		}
-		if opaque != nil && len(opaque) == 1 && opaque[0] == 'y' {
+		if len(opaque) == 1 && opaque[0] == 'y' {
 			// create a header for the whiteout file
 			// it should inherit some properties from the parent, but be a regular file
 			*hdr = tar.Header{
diff --git a/pkg/archive/changes_linux.go b/pkg/archive/changes_linux.go
index a4cc0c65d3..fc5a9dfdb9 100644
--- a/pkg/archive/changes_linux.go
+++ b/pkg/archive/changes_linux.go
@@ -302,7 +302,7 @@ func overlayDeletedFile(root, path string, fi os.FileInfo) (string, error) {
 		if err != nil {
 			return "", err
 		}
-		if opaque != nil && len(opaque) == 1 && opaque[0] == 'y' {
+		if len(opaque) == 1 && opaque[0] == 'y' {
 			return path, nil
 		}
 	}
diff --git a/pkg/discovery/backends.go b/pkg/discovery/backends.go
index 10febb5442..c09d9a1316 100644
--- a/pkg/discovery/backends.go
+++ b/pkg/discovery/backends.go
@@ -69,7 +69,7 @@ func ParseAdvertise(advertise string) (string, error) {
 		return "", fmt.Errorf("unable to get advertise IP address from interface (%s) : %v", advertise, err)
 	}
 
-	if addrs == nil || len(addrs) == 0 {
+	if len(addrs) == 0 {
 		return "", fmt.Errorf("no available advertise IP address in interface (%s)", advertise)
 	}