diff --git a/go.mod b/go.mod
index 4a59dc76..606f1cd9 100644
--- a/go.mod
+++ b/go.mod
@@ -58,7 +58,7 @@ require (
 	github.com/samedi/caldav-go v3.0.0+incompatible
 	github.com/shurcooL/httpfs v0.0.0-20190707220628-8d4bc4ba7749
 	github.com/shurcooL/vfsgen v0.0.0-20181202132449-6a9ea43bcacd
-	github.com/spf13/afero v1.2.2
+	github.com/spf13/afero v1.3.0
 	github.com/spf13/cobra v1.0.0
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/spf13/viper v1.7.0
diff --git a/go.sum b/go.sum
index 78bddcf7..dd725f22 100644
--- a/go.sum
+++ b/go.sum
@@ -291,6 +291,7 @@ github.com/kolaente/caldav-go v3.0.1-0.20190524174923-9e5cd1688227+incompatible/
 github.com/kolaente/fsnotify v1.4.10-0.20200411160148-1bc3c8ff4048 h1:j/BtLkVyqtAXvlb22nic/pSlWLuGx4gddouWVt65HDI=
 github.com/kolaente/fsnotify v1.4.10-0.20200411160148-1bc3c8ff4048/go.mod h1:dv6KyzAg9UuJWiE1pwkvvB2i0TvcQM6QhdsXLZ7K5KI=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
+github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
 github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
@@ -404,6 +405,7 @@ github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/sftp v1.10.1/go.mod h1:lYOWFsE0bwd1+KfKJaKeuokY15vzFx25BLbzYYoAxZI=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/posener/complete v1.1.1/go.mod h1:em0nMJCgc9GFtwrmVmEMR/ZL6WyhyjMBndrE9hABlRI=
@@ -467,6 +469,8 @@ github.com/spf13/afero v1.1.2 h1:m8/z1t7/fwjysjQRYbP0RD+bUIF/8tJwPdEZsI83ACI=
 github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B0CQ=
 github.com/spf13/afero v1.2.2 h1:5jhuqJyZCZf2JRofRvN/nIFgIWNzPa3/Vz8mYylgbWc=
 github.com/spf13/afero v1.2.2/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk=
+github.com/spf13/afero v1.3.0 h1:Ysnmjh1Di8EaWaBv40CYR4IdaIsBc5996Gh1oZzCBKk=
+github.com/spf13/afero v1.3.0/go.mod h1:5KUK8ByomD5Ti5Artl0RtHeI5pTF7MIDuXL3yY520V4=
 github.com/spf13/cast v1.3.0 h1:oget//CVOEoFewqQxwr0Ej5yjygnqGkvggSE/gB35Q8=
 github.com/spf13/cast v1.3.0/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
 github.com/spf13/cobra v1.0.0 h1:6m/oheQuQ13N9ks4hubMG6BnvwOeaJrqSPLahSnczz8=
@@ -549,6 +553,7 @@ golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/crypto v0.0.0-20190611184440-5c40567a22f8/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190621222207-cc06ce4a13d4 h1:ydJNl0ENAG67pFbB+9tfhiL2pYqLhfoaZFw/cjLhY4A=
 golang.org/x/crypto v0.0.0-20190621222207-cc06ce4a13d4/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200117160349-530e935923ad/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200221231518-2aa609cf4a9d/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
diff --git a/vendor/github.com/spf13/afero/.gitignore b/vendor/github.com/spf13/afero/.gitignore
new file mode 100644
index 00000000..9c1d9861
--- /dev/null
+++ b/vendor/github.com/spf13/afero/.gitignore
@@ -0,0 +1,2 @@
+sftpfs/file1
+sftpfs/test/
diff --git a/vendor/github.com/spf13/afero/.travis.yml b/vendor/github.com/spf13/afero/.travis.yml
index 0637db72..fdaa9998 100644
--- a/vendor/github.com/spf13/afero/.travis.yml
+++ b/vendor/github.com/spf13/afero/.travis.yml
@@ -1,21 +1,22 @@
-sudo: false
-language: go
-
-go:
-  - 1.9
-  - "1.10"
-  - tip
-
-os:
-  - linux
-  - osx
-
-matrix:
-  allow_failures:
-    - go: tip
-  fast_finish: true
-
-script:
-  - go build
-  - go test -race -v ./...
-
+sudo: false
+language: go
+
+go:
+  - "1.13"
+  - "1.14"
+  - tip
+
+os:
+  - linux
+  - osx
+
+matrix:
+  allow_failures:
+    - go: tip
+  fast_finish: true
+
+script:
+  - go build -v ./...
+  - go test -count=1 -cover -race -v ./...
+  - go vet ./...
+  - FILES=$(gofmt -s -l . zipfs sftpfs mem); if [[ -n "${FILES}" ]]; then  echo "You have go format errors; gofmt your changes"; exit 1; fi
diff --git a/vendor/github.com/spf13/afero/README.md b/vendor/github.com/spf13/afero/README.md
index 0c9b04b5..16b06f2b 100644
--- a/vendor/github.com/spf13/afero/README.md
+++ b/vendor/github.com/spf13/afero/README.md
@@ -6,7 +6,7 @@ A FileSystem Abstraction System for Go
 
 # Overview
 
-Afero is an filesystem framework providing a simple, uniform and universal API
+Afero is a filesystem framework providing a simple, uniform and universal API
 interacting with any filesystem, as an abstraction layer providing interfaces,
 types and methods. Afero has an exceptionally clean interface and simple design
 without needless constructors or initialization methods.
@@ -18,7 +18,7 @@ and benefit of the os and ioutil packages.
 Afero provides significant improvements over using the os package alone, most
 notably the ability to create mock and testing filesystems without relying on the disk.
 
-It is suitable for use in a any situation where you would consider using the OS
+It is suitable for use in any situation where you would consider using the OS
 package as it provides an additional abstraction that makes it easy to use a
 memory backed file system during testing. It also adds support for the http
 filesystem for full interoperability.
@@ -41,8 +41,8 @@ Afero is easy to use and easier to adopt.
 
 A few different ways you could use Afero:
 
-* Use the interfaces alone to define you own file system.
-* Wrap for the OS packages.
+* Use the interfaces alone to define your own file system.
+* Wrapper for the OS packages.
 * Define different filesystems for different parts of your application.
 * Use Afero for mock filesystems while testing
 
@@ -380,7 +380,6 @@ The following is a short list of possible backends we hope someone will
 implement:
 
 * SSH
-* ZIP
 * TAR
 * S3
 
@@ -406,28 +405,7 @@ Googles very well.
 
 ## Release Notes
 
-* **0.10.0** 2015.12.10
-  * Full compatibility with Windows
-  * Introduction of afero utilities
-  * Test suite rewritten to work cross platform
-  * Normalize paths for MemMapFs
-  * Adding Sync to the file interface
-  * **Breaking Change** Walk and ReadDir have changed parameter order
-  * Moving types used by MemMapFs to a subpackage
-  * General bugfixes and improvements
-* **0.9.0** 2015.11.05
-  * New Walk function similar to filepath.Walk
-  * MemMapFs.OpenFile handles O_CREATE, O_APPEND, O_TRUNC
-  * MemMapFs.Remove now really deletes the file
-  * InMemoryFile.Readdir and Readdirnames work correctly
-  * InMemoryFile functions lock it for concurrent access
-  * Test suite improvements
-* **0.8.0** 2014.10.28
-  * First public version
-  * Interfaces feel ready for people to build using
-  * Interfaces satisfy all known uses
-  * MemMapFs passes the majority of the OS test suite
-  * OsFs passes the majority of the OS test suite
+See the [Releases Page](https://github.com/spf13/afero/releases).
 
 ## Contributing
 
diff --git a/vendor/github.com/spf13/afero/appveyor.yml b/vendor/github.com/spf13/afero/appveyor.yml
index a633ad50..5d2f34bf 100644
--- a/vendor/github.com/spf13/afero/appveyor.yml
+++ b/vendor/github.com/spf13/afero/appveyor.yml
@@ -10,6 +10,6 @@ build_script:
 
     go get -v github.com/spf13/afero/...
 
-    go build github.com/spf13/afero
+    go build -v github.com/spf13/afero/...
 test_script:
-- cmd: go test -race -v github.com/spf13/afero/...
+- cmd: go test -count=1 -cover -race -v github.com/spf13/afero/...
diff --git a/vendor/github.com/spf13/afero/basepath.go b/vendor/github.com/spf13/afero/basepath.go
index 616ff8ff..3a14b833 100644
--- a/vendor/github.com/spf13/afero/basepath.go
+++ b/vendor/github.com/spf13/afero/basepath.go
@@ -177,4 +177,30 @@ func (b *BasePathFs) LstatIfPossible(name string) (os.FileInfo, bool, error) {
 	return fi, false, err
 }
 
+func (b *BasePathFs) SymlinkIfPossible(oldname, newname string) error {
+	oldname, err := b.RealPath(oldname)
+	if err != nil {
+		return &os.LinkError{Op: "symlink", Old: oldname, New: newname, Err: err}
+	}
+	newname, err = b.RealPath(newname)
+	if err != nil {
+		return &os.LinkError{Op: "symlink", Old: oldname, New: newname, Err: err}
+	}
+	if linker, ok := b.source.(Linker); ok {
+		return linker.SymlinkIfPossible(oldname, newname)
+	}
+	return &os.LinkError{Op: "symlink", Old: oldname, New: newname, Err: ErrNoSymlink}
+}
+
+func (b *BasePathFs) ReadlinkIfPossible(name string) (string, error) {
+	name, err := b.RealPath(name)
+	if err != nil {
+		return "", &os.PathError{Op: "readlink", Path: name, Err: err}
+	}
+	if reader, ok := b.source.(LinkReader); ok {
+		return reader.ReadlinkIfPossible(name)
+	}
+	return "", &os.PathError{Op: "readlink", Path: name, Err: ErrNoReadlink}
+}
+
 // vim: ts=4 sw=4 noexpandtab nolist syn=go
diff --git a/vendor/github.com/spf13/afero/const_bsds.go b/vendor/github.com/spf13/afero/const_bsds.go
index 5728243d..18b45824 100644
--- a/vendor/github.com/spf13/afero/const_bsds.go
+++ b/vendor/github.com/spf13/afero/const_bsds.go
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build darwin openbsd freebsd netbsd dragonfly
+// +build aix darwin openbsd freebsd netbsd dragonfly
 
 package afero
 
diff --git a/vendor/github.com/spf13/afero/const_win_unix.go b/vendor/github.com/spf13/afero/const_win_unix.go
index 968fc278..2b850e4d 100644
--- a/vendor/github.com/spf13/afero/const_win_unix.go
+++ b/vendor/github.com/spf13/afero/const_win_unix.go
@@ -15,6 +15,7 @@
 // +build !freebsd
 // +build !dragonfly
 // +build !netbsd
+// +build !aix
 
 package afero
 
diff --git a/vendor/github.com/spf13/afero/copyOnWriteFs.go b/vendor/github.com/spf13/afero/copyOnWriteFs.go
index e8108a85..96b77012 100644
--- a/vendor/github.com/spf13/afero/copyOnWriteFs.go
+++ b/vendor/github.com/spf13/afero/copyOnWriteFs.go
@@ -117,6 +117,26 @@ func (u *CopyOnWriteFs) LstatIfPossible(name string) (os.FileInfo, bool, error)
 	return fi, false, err
 }
 
+func (u *CopyOnWriteFs) SymlinkIfPossible(oldname, newname string) error {
+	if slayer, ok := u.layer.(Linker); ok {
+		return slayer.SymlinkIfPossible(oldname, newname)
+	}
+
+	return &os.LinkError{Op: "symlink", Old: oldname, New: newname, Err: ErrNoSymlink}
+}
+
+func (u *CopyOnWriteFs) ReadlinkIfPossible(name string) (string, error) {
+	if rlayer, ok := u.layer.(LinkReader); ok {
+		return rlayer.ReadlinkIfPossible(name)
+	}
+
+	if rbase, ok := u.base.(LinkReader); ok {
+		return rbase.ReadlinkIfPossible(name)
+	}
+
+	return "", &os.PathError{Op: "readlink", Path: name, Err: ErrNoReadlink}
+}
+
 func (u *CopyOnWriteFs) isNotExist(err error) bool {
 	if e, ok := err.(*os.PathError); ok {
 		err = e.Err
diff --git a/vendor/github.com/spf13/afero/go.mod b/vendor/github.com/spf13/afero/go.mod
index 08685509..4b2384b3 100644
--- a/vendor/github.com/spf13/afero/go.mod
+++ b/vendor/github.com/spf13/afero/go.mod
@@ -1,3 +1,9 @@
 module github.com/spf13/afero
 
-require golang.org/x/text v0.3.0
+require (
+	github.com/pkg/sftp v1.10.1
+	golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586
+	golang.org/x/text v0.3.0
+)
+
+go 1.13
diff --git a/vendor/github.com/spf13/afero/go.sum b/vendor/github.com/spf13/afero/go.sum
index 6bad37b2..4b766482 100644
--- a/vendor/github.com/spf13/afero/go.sum
+++ b/vendor/github.com/spf13/afero/go.sum
@@ -1,2 +1,20 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/kr/fs v0.1.0 h1:Jskdu9ieNAYnjxsi0LbQp1ulIKZV1LAFgK1tWhpZgl8=
+github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
+github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/sftp v1.10.1 h1:VasscCm72135zRysgrJDKsntdmPN+OuU3+nnHYA9wyc=
+github.com/pkg/sftp v1.10.1/go.mod h1:lYOWFsE0bwd1+KfKJaKeuokY15vzFx25BLbzYYoAxZI=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586 h1:7KByu05hhLed2MO29w7p1XfZvZ13m8mub3shuVftRs0=
+golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/vendor/github.com/spf13/afero/ioutil.go b/vendor/github.com/spf13/afero/ioutil.go
index 5c3a3d8f..a403133e 100644
--- a/vendor/github.com/spf13/afero/ioutil.go
+++ b/vendor/github.com/spf13/afero/ioutil.go
@@ -22,6 +22,7 @@ import (
 	"path/filepath"
 	"sort"
 	"strconv"
+	"strings"
 	"sync"
 	"time"
 )
@@ -147,7 +148,7 @@ func reseed() uint32 {
 	return uint32(time.Now().UnixNano() + int64(os.Getpid()))
 }
 
-func nextSuffix() string {
+func nextRandom() string {
 	randmu.Lock()
 	r := rand
 	if r == 0 {
@@ -159,27 +160,36 @@ func nextSuffix() string {
 	return strconv.Itoa(int(1e9 + r%1e9))[1:]
 }
 
-// TempFile creates a new temporary file in the directory dir
-// with a name beginning with prefix, opens the file for reading
-// and writing, and returns the resulting *File.
+// TempFile creates a new temporary file in the directory dir,
+// opens the file for reading and writing, and returns the resulting *os.File.
+// The filename is generated by taking pattern and adding a random
+// string to the end. If pattern includes a "*", the random string
+// replaces the last "*".
 // If dir is the empty string, TempFile uses the default directory
 // for temporary files (see os.TempDir).
 // Multiple programs calling TempFile simultaneously
-// will not choose the same file.  The caller can use f.Name()
-// to find the pathname of the file.  It is the caller's responsibility
+// will not choose the same file. The caller can use f.Name()
+// to find the pathname of the file. It is the caller's responsibility
 // to remove the file when no longer needed.
-func (a Afero) TempFile(dir, prefix string) (f File, err error) {
-	return TempFile(a.Fs, dir, prefix)
+func (a Afero) TempFile(dir, pattern string) (f File, err error) {
+	return TempFile(a.Fs, dir, pattern)
 }
 
-func TempFile(fs Fs, dir, prefix string) (f File, err error) {
+func TempFile(fs Fs, dir, pattern string) (f File, err error) {
 	if dir == "" {
 		dir = os.TempDir()
 	}
 
+	var prefix, suffix string
+	if pos := strings.LastIndex(pattern, "*"); pos != -1 {
+		prefix, suffix = pattern[:pos], pattern[pos+1:]
+	} else {
+		prefix = pattern
+	}
+
 	nconflict := 0
 	for i := 0; i < 10000; i++ {
-		name := filepath.Join(dir, prefix+nextSuffix())
+		name := filepath.Join(dir, prefix+nextRandom()+suffix)
 		f, err = fs.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600)
 		if os.IsExist(err) {
 			if nconflict++; nconflict > 10 {
@@ -211,7 +221,7 @@ func TempDir(fs Fs, dir, prefix string) (name string, err error) {
 
 	nconflict := 0
 	for i := 0; i < 10000; i++ {
-		try := filepath.Join(dir, prefix+nextSuffix())
+		try := filepath.Join(dir, prefix+nextRandom())
 		err = fs.Mkdir(try, 0700)
 		if os.IsExist(err) {
 			if nconflict++; nconflict > 10 {
diff --git a/vendor/github.com/spf13/afero/match.go b/vendor/github.com/spf13/afero/match.go
index c18a87fb..7db4b7de 100644
--- a/vendor/github.com/spf13/afero/match.go
+++ b/vendor/github.com/spf13/afero/match.go
@@ -106,5 +106,5 @@ func glob(fs Fs, dir, pattern string, matches []string) (m []string, e error) {
 // recognized by Match.
 func hasMeta(path string) bool {
 	// TODO(niemeyer): Should other magic characters be added here?
-	return strings.IndexAny(path, "*?[") >= 0
+	return strings.ContainsAny(path, "*?[")
 }
diff --git a/vendor/github.com/spf13/afero/mem/file.go b/vendor/github.com/spf13/afero/mem/file.go
index 7af2fb56..699f1fb0 100644
--- a/vendor/github.com/spf13/afero/mem/file.go
+++ b/vendor/github.com/spf13/afero/mem/file.go
@@ -193,8 +193,11 @@ func (f *File) Read(b []byte) (n int, err error) {
 }
 
 func (f *File) ReadAt(b []byte, off int64) (n int, err error) {
+	prev := atomic.LoadInt64(&f.at)
 	atomic.StoreInt64(&f.at, off)
-	return f.Read(b)
+	n, err = f.Read(b)
+	atomic.StoreInt64(&f.at, prev)
+	return
 }
 
 func (f *File) Truncate(size int64) error {
@@ -233,6 +236,9 @@ func (f *File) Seek(offset int64, whence int) (int64, error) {
 }
 
 func (f *File) Write(b []byte) (n int, err error) {
+	if f.closed == true {
+		return 0, ErrFileClosed
+	}
 	if f.readOnly {
 		return 0, &os.PathError{Op: "write", Path: f.fileData.name, Err: errors.New("file handle is read only")}
 	}
diff --git a/vendor/github.com/spf13/afero/memmap.go b/vendor/github.com/spf13/afero/memmap.go
index 09498e70..b7b1474b 100644
--- a/vendor/github.com/spf13/afero/memmap.go
+++ b/vendor/github.com/spf13/afero/memmap.go
@@ -212,6 +212,9 @@ func (m *MemMapFs) lockfreeOpen(name string) (*mem.FileData, error) {
 func (m *MemMapFs) OpenFile(name string, flag int, perm os.FileMode) (File, error) {
 	chmod := false
 	file, err := m.openWrite(name)
+	if err == nil && (flag&os.O_EXCL > 0) {
+		return nil, &os.PathError{Op: "open", Path: name, Err: ErrFileExists}
+	}
 	if os.IsNotExist(err) && (flag&os.O_CREATE > 0) {
 		file, err = m.Create(name)
 		chmod = true
@@ -269,7 +272,7 @@ func (m *MemMapFs) RemoveAll(path string) error {
 	m.mu.RLock()
 	defer m.mu.RUnlock()
 
-	for p, _ := range m.getData() {
+	for p := range m.getData() {
 		if strings.HasPrefix(p, path) {
 			m.mu.RUnlock()
 			m.mu.Lock()
diff --git a/vendor/github.com/spf13/afero/os.go b/vendor/github.com/spf13/afero/os.go
index 13cc1b84..4761db5d 100644
--- a/vendor/github.com/spf13/afero/os.go
+++ b/vendor/github.com/spf13/afero/os.go
@@ -99,3 +99,11 @@ func (OsFs) LstatIfPossible(name string) (os.FileInfo, bool, error) {
 	fi, err := os.Lstat(name)
 	return fi, true, err
 }
+
+func (OsFs) SymlinkIfPossible(oldname, newname string) error {
+	return os.Symlink(oldname, newname)
+}
+
+func (OsFs) ReadlinkIfPossible(name string) (string, error) {
+	return os.Readlink(name)
+}
diff --git a/vendor/github.com/spf13/afero/readonlyfs.go b/vendor/github.com/spf13/afero/readonlyfs.go
index c6376ec3..f94b181b 100644
--- a/vendor/github.com/spf13/afero/readonlyfs.go
+++ b/vendor/github.com/spf13/afero/readonlyfs.go
@@ -44,6 +44,18 @@ func (r *ReadOnlyFs) LstatIfPossible(name string) (os.FileInfo, bool, error) {
 	return fi, false, err
 }
 
+func (r *ReadOnlyFs) SymlinkIfPossible(oldname, newname string) error {
+	return &os.LinkError{Op: "symlink", Old: oldname, New: newname, Err: ErrNoSymlink}
+}
+
+func (r *ReadOnlyFs) ReadlinkIfPossible(name string) (string, error) {
+	if srdr, ok := r.source.(LinkReader); ok {
+		return srdr.ReadlinkIfPossible(name)
+	}
+
+	return "", &os.PathError{Op: "readlink", Path: name, Err: ErrNoReadlink}
+}
+
 func (r *ReadOnlyFs) Rename(o, n string) error {
 	return syscall.EPERM
 }
diff --git a/vendor/github.com/spf13/afero/regexpfs.go b/vendor/github.com/spf13/afero/regexpfs.go
index 9d92dbc0..c8fc0086 100644
--- a/vendor/github.com/spf13/afero/regexpfs.go
+++ b/vendor/github.com/spf13/afero/regexpfs.go
@@ -126,6 +126,9 @@ func (r *RegexpFs) Open(name string) (File, error) {
 		}
 	}
 	f, err := r.source.Open(name)
+	if err != nil {
+		return nil, err
+	}
 	return &RegexpFile{f: f, re: r.re}, nil
 }
 
diff --git a/vendor/github.com/spf13/afero/symlink.go b/vendor/github.com/spf13/afero/symlink.go
new file mode 100644
index 00000000..d1c6ea53
--- /dev/null
+++ b/vendor/github.com/spf13/afero/symlink.go
@@ -0,0 +1,55 @@
+// Copyright © 2018 Steve Francia <spf@spf13.com>.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package afero
+
+import (
+	"errors"
+)
+
+// Symlinker is an optional interface in Afero. It is only implemented by the
+// filesystems saying so.
+// It indicates support for 3 symlink related interfaces that implement the
+// behaviors of the os methods:
+//    - Lstat
+//    - Symlink, and
+//    - Readlink
+type Symlinker interface {
+	Lstater
+	Linker
+	LinkReader
+}
+
+// Linker is an optional interface in Afero. It is only implemented by the
+// filesystems saying so.
+// It will call Symlink if the filesystem itself is, or it delegates to, the os filesystem,
+// or the filesystem otherwise supports Symlink's.
+type Linker interface {
+	SymlinkIfPossible(oldname, newname string) error
+}
+
+// ErrNoSymlink is the error that will be wrapped in an os.LinkError if a file system
+// does not support Symlink's either directly or through its delegated filesystem.
+// As expressed by support for the Linker interface.
+var ErrNoSymlink = errors.New("symlink not supported")
+
+// LinkReader is an optional interface in Afero. It is only implemented by the
+// filesystems saying so.
+type LinkReader interface {
+	ReadlinkIfPossible(name string) (string, error)
+}
+
+// ErrNoReadlink is the error that will be wrapped in an os.Path if a file system
+// does not support the readlink operation either directly or through its delegated filesystem.
+// As expressed by support for the LinkReader interface.
+var ErrNoReadlink = errors.New("readlink not supported")
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 8d3a8e60..a0cf7368 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -188,7 +188,7 @@ github.com/shurcooL/httpfs/vfsutil
 github.com/shurcooL/sanitized_anchor_name
 # github.com/shurcooL/vfsgen v0.0.0-20181202132449-6a9ea43bcacd
 github.com/shurcooL/vfsgen
-# github.com/spf13/afero v1.2.2
+# github.com/spf13/afero v1.3.0
 github.com/spf13/afero
 github.com/spf13/afero/mem
 # github.com/spf13/cast v1.3.0