Repository: spf13/viper
Pull request #1213 (2021-09-14 01:24:26)

Remove unnecessary operand

CLAassistant: [![CLA assistant check](https://cla-assistant.io/pull/badge/not_signed)](https://cla-assistant.io/spf13/viper?pullRequest=1213) <br/>Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our [Contributor License Agreement](https://cla-assistant.io/spf13/viper?pullRequest=1213) before we can accept your contribution.<br/><sub>You have signed the CLA already but the status is still pending? Let us [recheck](https://cla-assistant.io/check/spf13/viper?pullRequest=1213) it.</sub>
github-actions[bot]: 👋 Thanks for contributing to Viper! You are awesome! 🎉

A maintainer will take a look at your pull request shortly. 👀

In the meantime: We are working on **Viper v2** and we would love to hear your thoughts about what you like or don't like about Viper, so we can improve or fix those issues.

⏰ If you have a couple minutes, please take some time and share your thoughts: https://forms.gle/R6faU74qPRPAzchZ9

📣 If you've already given us your feedback, you can still help by spreading the news,
either by sharing the above link or telling people about this on Twitter:

https://twitter.com/sagikazarmark/status/1306904078967074816

**Thank you!** ❤️


Patch:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5267fe2..53ba804 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,17 +7,18 @@ on:
   pull_request:
 
 jobs:
-  build:
-    name: Build
+  test:
+    name: Test
     runs-on: ${{ matrix.os }}
     strategy:
+      # Fail fast is disabled because there are Go version specific features and tests
+      # that should be able to fail independently.
+      fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest, macos-latest, windows-latest]
         go: ['1.14', '1.15', '1.16', '1.17']
     env:
-      VERBOSE: 1
       GOFLAGS: -mod=readonly
-      GOPROXY: https://proxy.golang.org
 
     steps:
       - name: Set up Go
@@ -28,8 +29,25 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
 
-      - name: Lint
-        run: make lint
-
       - name: Test
-        run: make test
+        run: go test -race -v ./...
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    env:
+      GOFLAGS: -mod=readonly
+
+    steps:
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.17
+
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Lint
+        uses: golangci/golangci-lint-action@v2
+        with:
+          version: v1.43.0
diff --git a/.github/workflows/codeql-analysis.yaml b/.github/workflows/codeql-analysis.yaml
new file mode 100644
index 0000000..60bf45c
--- /dev/null
+++ b/.github/workflows/codeql-analysis.yaml
@@ -0,0 +1,72 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master ]
+  schedule:
+    - cron: '22 16 * * 3'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1
+
diff --git a/.github/workflows/feedback_issue.yml b/.github/workflows/feedback_issue.yml
index c329b39..87453cf 100644
--- a/.github/workflows/feedback_issue.yml
+++ b/.github/workflows/feedback_issue.yml
@@ -6,11 +6,11 @@ jobs:
   comment:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/github-script@v4
+      - uses: actions/github-script@v5
         with:
           github-token: ${{secrets.GITHUB_TOKEN}}
           script: |
-            github.issues.createComment({
+            github.rest.issues.createComment({
               issue_number: context.issue.number,
               owner: context.repo.owner,
               repo: context.repo.repo,
diff --git a/.github/workflows/feedback_pull_request.yml b/.github/workflows/feedback_pull_request.yml
index bd3b225..d3e5d22 100644
--- a/.github/workflows/feedback_pull_request.yml
+++ b/.github/workflows/feedback_pull_request.yml
@@ -6,11 +6,11 @@ jobs:
   comment:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/github-script@v4
+      - uses: actions/github-script@v5
         with:
           github-token: ${{secrets.GITHUB_TOKEN}}
           script: |
-            github.issues.createComment({
+            github.rest.issues.createComment({
               issue_number: context.issue.number,
               owner: context.repo.owner,
               repo: context.repo.repo,
diff --git a/.golangci.yml b/.golangci.yml
index 4f970ac..52e77ee 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -20,7 +20,6 @@ linters:
         - exhaustive
         - exportloopref
         - gci
-        - goconst
         - gofmt
         - gofumpt
         - goimports
@@ -62,6 +61,7 @@ linters:
         # - gochecknoglobals
         # - gochecknoinits
         # - gocognit
+        # - goconst
         # - gocritic
         # - gocyclo
         # - godot
diff --git a/Makefile b/Makefile
index b0f9acf..1279096 100644
--- a/Makefile
+++ b/Makefile
@@ -15,8 +15,8 @@ TEST_FORMAT = short-verbose
 endif
 
 # Dependency versions
-GOTESTSUM_VERSION = 1.6.4
-GOLANGCI_VERSION = 1.40.1
+GOTESTSUM_VERSION = 1.7.0
+GOLANGCI_VERSION = 1.43.0
 
 # Add the ability to override some variables
 # Use with care
diff --git a/README.md b/README.md
index 97654df..9712e70 100644
--- a/README.md
+++ b/README.md
@@ -127,11 +127,11 @@ You can handle the specific case where no config file is found like this:
 
 ```go
 if err := viper.ReadInConfig(); err != nil {
-    if _, ok := err.(viper.ConfigFileNotFoundError); ok {
-        // Config file not found; ignore error if desired
-    } else {
-        // Config file was found but another error was produced
-    }
+	if _, ok := err.(viper.ConfigFileNotFoundError); ok {
+		// Config file not found; ignore error if desired
+	} else {
+		// Config file was found but another error was produced
+	}
 }
 
 // Config file found and successfully parsed
@@ -354,7 +354,7 @@ func main() {
 
 	i := viper.GetInt("flagname") // retrieve value from viper
 
-	...
+	// ...
 }
 ```
 
@@ -503,18 +503,18 @@ runtime_viper.Unmarshal(&runtime_conf)
 // open a goroutine to watch remote changes forever
 go func(){
 	for {
-	    time.Sleep(time.Second * 5) // delay after each request
-
-	    // currently, only tested with etcd support
-	    err := runtime_viper.WatchRemoteConfig()
-	    if err != nil {
-	        log.Errorf("unable to read remote config: %v", err)
-	        continue
-	    }
-
-	    // unmarshal new config into our runtime config struct. you can also use channel
-	    // to implement a signal to notify the system of the changes
-	    runtime_viper.Unmarshal(&runtime_conf)
+		time.Sleep(time.Second * 5) // delay after each request
+
+		// currently, only tested with etcd support
+		err := runtime_viper.WatchRemoteConfig()
+		if err != nil {
+			log.Errorf("unable to read remote config: %v", err)
+			continue
+		}
+
+		// unmarshal new config into our runtime config struct. you can also use channel
+		// to implement a signal to notify the system of the changes
+		runtime_viper.Unmarshal(&runtime_conf)
 	}
 }()
 ```
@@ -546,7 +546,7 @@ Example:
 ```go
 viper.GetString("logfile") // case-insensitive Setting & Getting
 if viper.GetBool("verbose") {
-    fmt.Println("verbose enabled")
+	fmt.Println("verbose enabled")
 }
 ```
 ### Accessing nested keys
@@ -669,7 +669,7 @@ So instead of doing that let's pass a Viper instance to the constructor that rep
 ```go
 cache1Config := viper.Sub("cache.cache1")
 if cache1Config == nil { // Sub returns nil if the key cannot be found
-    panic("cache configuration not found")
+	panic("cache configuration not found")
 }
 
 cache1 := NewCache(cache1Config)
@@ -681,10 +681,10 @@ Internally, the `NewCache` function can address `max-items` and `item-size` keys
 
 ```go
 func NewCache(v *Viper) *Cache {
-    return &Cache{
-        MaxItems: v.GetInt("max-items"),
-        ItemSize: v.GetInt("item-size"),
-    }
+	return &Cache{
+		MaxItems: v.GetInt("max-items"),
+		ItemSize: v.GetInt("item-size"),
+	}
 }
 ```
 
@@ -726,18 +726,18 @@ you have to change the delimiter:
 v := viper.NewWithOptions(viper.KeyDelimiter("::"))
 
 v.SetDefault("chart::values", map[string]interface{}{
-    "ingress": map[string]interface{}{
-        "annotations": map[string]interface{}{
-            "traefik.frontend.rule.type":                 "PathPrefix",
-            "traefik.ingress.kubernetes.io/ssl-redirect": "true",
-        },
-    },
+	"ingress": map[string]interface{}{
+		"annotations": map[string]interface{}{
+			"traefik.frontend.rule.type":                 "PathPrefix",
+			"traefik.ingress.kubernetes.io/ssl-redirect": "true",
+		},
+	},
 })
 
 type config struct {
 	Chart struct{
-        Values map[string]interface{}
-    }
+		Values map[string]interface{}
+	}
 }
 
 var C config
@@ -794,17 +794,17 @@ You can use your favorite format's marshaller with the config returned by `AllSe
 
 ```go
 import (
-    yaml "gopkg.in/yaml.v2"
-    // ...
+	yaml "gopkg.in/yaml.v2"
+	// ...
 )
 
 func yamlStringSettings() string {
-    c := viper.AllSettings()
-    bs, err := yaml.Marshal(c)
-    if err != nil {
-        log.Fatalf("unable to marshal config to YAML: %v", err)
-    }
-    return string(bs)
+	c := viper.AllSettings()
+	bs, err := yaml.Marshal(c)
+	if err != nil {
+		log.Fatalf("unable to marshal config to YAML: %v", err)
+	}
+	return string(bs)
 }
 ```
 
diff --git a/fs.go b/fs.go
new file mode 100644
index 0000000..ecb1769
--- /dev/null
+++ b/fs.go
@@ -0,0 +1,65 @@
+//go:build go1.16 && finder
+// +build go1.16,finder
+
+package viper
+
+import (
+	"errors"
+	"io/fs"
+	"path"
+)
+
+type finder struct {
+	paths      []string
+	fileNames  []string
+	extensions []string
+
+	withoutExtension bool
+}
+
+func (f finder) Find(fsys fs.FS) (string, error) {
+	for _, searchPath := range f.paths {
+		for _, fileName := range f.fileNames {
+			for _, extension := range f.extensions {
+				filePath := path.Join(searchPath, fileName+"."+extension)
+
+				ok, err := fileExists(fsys, filePath)
+				if err != nil {
+					return "", err
+				}
+
+				if ok {
+					return filePath, nil
+				}
+			}
+
+			if f.withoutExtension {
+				filePath := path.Join(searchPath, fileName)
+
+				ok, err := fileExists(fsys, filePath)
+				if err != nil {
+					return "", err
+				}
+
+				if ok {
+					return filePath, nil
+				}
+			}
+		}
+	}
+
+	return "", nil
+}
+
+func fileExists(fsys fs.FS, filePath string) (bool, error) {
+	fileInfo, err := fs.Stat(fsys, filePath)
+	if err == nil {
+		return !fileInfo.IsDir(), nil
+	}
+
+	if errors.Is(err, fs.ErrNotExist) {
+		return false, nil
+	}
+
+	return false, err
+}
diff --git a/go.mod b/go.mod
index 0157c74..91f39a3 100644
--- a/go.mod
+++ b/go.mod
@@ -1,21 +1,69 @@
 module github.com/spf13/viper
 
-go 1.12
+go 1.17
 
 require (
-	github.com/bketelsen/crypt v0.0.4
 	github.com/fsnotify/fsnotify v1.5.1
 	github.com/hashicorp/hcl v1.0.0
 	github.com/magiconair/properties v1.8.5
-	github.com/mitchellh/mapstructure v1.4.1
-	github.com/pelletier/go-toml v1.9.3
-	github.com/smartystreets/goconvey v1.6.4 // indirect
+	github.com/mitchellh/mapstructure v1.4.3
+	github.com/pelletier/go-toml v1.9.4
+	github.com/sagikazarmark/crypt v0.4.0
 	github.com/spf13/afero v1.6.0
 	github.com/spf13/cast v1.4.1
 	github.com/spf13/jwalterweatherman v1.1.0
 	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.7.0
 	github.com/subosito/gotenv v1.2.0
-	gopkg.in/ini.v1 v1.62.0
+	gopkg.in/ini.v1 v1.66.2
 	gopkg.in/yaml.v2 v2.4.0
 )
+
+require (
+	cloud.google.com/go v0.99.0 // indirect
+	cloud.google.com/go/firestore v1.6.1 // indirect
+	github.com/armon/go-metrics v0.3.10 // indirect
+	github.com/census-instrumentation/opencensus-proto v0.3.0 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/cncf/udpa/go v0.0.0-20210930031921-04548b0d99d4 // indirect
+	github.com/cncf/xds/go v0.0.0-20211130200136-a8f946100490 // indirect
+	github.com/coreos/go-semver v0.3.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/envoyproxy/go-control-plane v0.10.1 // indirect
+	github.com/envoyproxy/protoc-gen-validate v0.6.2 // indirect
+	github.com/fatih/color v1.13.0 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/google/go-cmp v0.5.6 // indirect
+	github.com/googleapis/gax-go/v2 v2.1.1 // indirect
+	github.com/hashicorp/consul/api v1.12.0 // indirect
+	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
+	github.com/hashicorp/go-hclog v1.0.0 // indirect
+	github.com/hashicorp/go-immutable-radix v1.3.1 // indirect
+	github.com/hashicorp/go-rootcerts v1.0.2 // indirect
+	github.com/hashicorp/golang-lru v0.5.4 // indirect
+	github.com/hashicorp/serf v0.9.6 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/mattn/go-colorable v0.1.12 // indirect
+	github.com/mattn/go-isatty v0.0.14 // indirect
+	github.com/mitchellh/go-homedir v1.1.0 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	go.etcd.io/etcd/api/v3 v3.5.1 // indirect
+	go.etcd.io/etcd/client/pkg/v3 v3.5.1 // indirect
+	go.etcd.io/etcd/client/v2 v2.305.1 // indirect
+	go.opencensus.io v0.23.0 // indirect
+	golang.org/x/crypto v0.0.0-20210817164053-32db794688a5 // indirect
+	golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d // indirect
+	golang.org/x/oauth2 v0.0.0-20211104180415-d3ed0bb246c8 // indirect
+	golang.org/x/sys v0.0.0-20211210111614-af8b64212486 // indirect
+	golang.org/x/text v0.3.7 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	google.golang.org/api v0.63.0 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/genproto v0.0.0-20211208223120-3a66f561d7aa // indirect
+	google.golang.org/grpc v1.43.0 // indirect
+	google.golang.org/protobuf v1.27.1 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+)
diff --git a/go.sum b/go.sum
index 76cf538..ceb4d98 100644
--- a/go.sum
+++ b/go.sum
@@ -17,8 +17,16 @@ cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKP
 cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
 cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg=
 cloud.google.com/go v0.79.0/go.mod h1:3bzgcEeQlzbuEAYu4mrWhKqWjmpprinYgKJLgKHnbb8=
-cloud.google.com/go v0.81.0 h1:at8Tk2zUz63cLPR0JPWm5vp77pEZmzxEQBEfRKn1VV8=
 cloud.google.com/go v0.81.0/go.mod h1:mk/AM35KwGk/Nm2YSeZbxXdrNK3KZOYHmLkOqC2V6E0=
+cloud.google.com/go v0.83.0/go.mod h1:Z7MJUsANfY0pYPdw0lbnivPx4/vhy/e2FEkSkF7vAVY=
+cloud.google.com/go v0.84.0/go.mod h1:RazrYuxIK6Kb7YrzzhPoLmCVzl7Sup4NrbKPg8KHSUM=
+cloud.google.com/go v0.87.0/go.mod h1:TpDYlFy7vuLzZMMZ+B6iRiELaY7z/gJPaqbMx6mlWcY=
+cloud.google.com/go v0.90.0/go.mod h1:kRX0mNRHe0e2rC6oNakvwQqzyDmg57xJ+SZU1eT2aDQ=
+cloud.google.com/go v0.93.3/go.mod h1:8utlLll2EF5XMAV15woO4lSbWQlk8rer9aLOfLh7+YI=
+cloud.google.com/go v0.94.1/go.mod h1:qAlAugsXlC+JWO+Bke5vCtc9ONxjQT3drlTTnAplMW4=
+cloud.google.com/go v0.97.0/go.mod h1:GF7l59pYBVlXQIBLx3a761cZ41F9bBH3JUlihCt2Udc=
+cloud.google.com/go v0.99.0 h1:y/cM2iqGgGi5D5DQZl6D9STN/3dR/Vx5Mp8s752oJTY=
+cloud.google.com/go v0.99.0/go.mod h1:w0Xx2nLzqWJPuozYQX+hFfCSI8WioryfRDzkoI/Y2ZA=
 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
 cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
 cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
@@ -27,8 +35,8 @@ cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4g
 cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
 cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
 cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
-cloud.google.com/go/firestore v1.1.0 h1:9x7Bx0A9R5/M9jibeJeZWqjeVEIxYW9fZYqB9a70/bY=
-cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
+cloud.google.com/go/firestore v1.6.1 h1:8rBq3zRjnHx8UtBvaOWqBB1xq9jH6/wltfQLlTMh2Fw=
+cloud.google.com/go/firestore v1.6.1/go.mod h1:asNXNOzBdyVQmEU+ggO8UPodTkEVFW5Qx+rwHnAz+EY=
 cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
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@@ -69,21 +104,37 @@ github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1m
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@@ -92,6 +143,7 @@ github.com/golang/mock v1.4.1/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt
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@@ -110,6 +162,7 @@ github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaS
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@@ -123,12 +176,14 @@ github.com/google/go-cmp v0.5.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
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@@ -250,6 +353,8 @@ github.com/spf13/jwalterweatherman v1.1.0/go.mod h1:aNWZUN0dPAAO/Ljvb5BEdw96iTZ0
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@@ -259,17 +364,18 @@ github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5Cc
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-go.etcd.io/etcd/client/pkg/v3 v3.5.0 h1:2aQv6F436YnN7I4VbI8PPYrBhu+SmrTaADcf8Mi/6PU=
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+go.etcd.io/etcd/client/pkg/v3 v3.5.1/go.mod h1:IJHfcCEKxYu1Os13ZdwCwIUTUVGYTSAM3YSwc9/Ac1g=
+go.etcd.io/etcd/client/v2 v2.305.1 h1:vtxYCKWA9x31w0WJj7DdqsHFNjhkigdAnziDtkZb/l4=
+go.etcd.io/etcd/client/v2 v2.305.1/go.mod h1:pMEacxZW7o8pg4CrFE7pquyCJJzZvkvdD2RibOCCCGs=
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@@ -278,17 +384,20 @@ go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
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@@ -312,7 +421,6 @@ golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f/go.mod h1:5qLYkcX4OjUUV8bRu
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@@ -324,12 +432,11 @@ golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.1/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/mod v0.4.2 h1:Gz96sIWK3OalVv/I/qNygP42zyoKp3xptRVCWRFEBvo=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
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 golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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@@ -337,9 +444,11 @@ golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn
 golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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@@ -361,8 +470,11 @@ golang.org/x/net v0.0.0-20201209123823-ac852fbbde11/go.mod h1:m0MpNAwzfU5UDzcl9v
 golang.org/x/net v0.0.0-20210119194325-5f4716e94777/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
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@@ -374,8 +486,13 @@ golang.org/x/oauth2 v0.0.0-20201208152858-08078c50e5b5/go.mod h1:KelEdhl1UZF7XfJ
 golang.org/x/oauth2 v0.0.0-20210218202405-ba52d332ba99/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
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 golang.org/x/oauth2 v0.0.0-20210313182246-cd4f82c27b84/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
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@@ -386,24 +503,32 @@ golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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@@ -422,14 +547,28 @@ golang.org/x/sys v0.0.0-20201201145000-ef89a241ccb3/go.mod h1:h1NjWce9XRLGQEsW7w
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 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -437,8 +576,10 @@ golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.5 h1:i6eZZ+zk0SOf0xgBpEpPD18qWcJda6q1sxt3S0kzyUQ=
 golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -448,7 +589,6 @@ golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 golang.org/x/tools v0.0.0-20190506145303-2d16b83fe98c/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
@@ -456,9 +596,9 @@ golang.org/x/tools v0.0.0-20190606124116-d0a3d012864b/go.mod h1:/rFqwRUd4F7ZHNgw
 golang.org/x/tools v0.0.0-20190621195816-6e04913cbbac/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
 golang.org/x/tools v0.0.0-20190628153133-6cdbf07be9d0/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
 golang.org/x/tools v0.0.0-20190816200558-6889da9d5479/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
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 golang.org/x/tools v0.0.0-20190911174233-4f2ddba30aff/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191012152004-8de300cfc20a/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
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 golang.org/x/tools v0.0.0-20191113191852-77e3bb0ad9e7/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191115202509-3a792d9c32b2/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
@@ -492,8 +632,11 @@ golang.org/x/tools v0.0.0-20201208233053-a543418bbed2/go.mod h1:emZCQorbCU4vsT4f
 golang.org/x/tools v0.0.0-20210105154028-b0ab187a4818/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
-golang.org/x/tools v0.1.2 h1:kRBLX7v7Af8W7Gdbbc908OJcdgtK8bOz9Uaj8/F1ACA=
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 golang.org/x/tools v0.1.2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
+golang.org/x/tools v0.1.3/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
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 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -520,8 +663,18 @@ google.golang.org/api v0.36.0/go.mod h1:+z5ficQTmoYpPn8LCUNVpK5I7hwkpjbcgqA7I34q
 google.golang.org/api v0.40.0/go.mod h1:fYKFpnQN0DsDSKRVRcQSDQNtqWPfM9i+zNPxepjRCQ8=
 google.golang.org/api v0.41.0/go.mod h1:RkxM5lITDfTzmyKFPt+wGrCJbVfniCr2ool8kTBzRTU=
 google.golang.org/api v0.43.0/go.mod h1:nQsDGjRXMo4lvh5hP0TKqF244gqhGcr/YSIykhUk/94=
-google.golang.org/api v0.44.0 h1:URs6qR1lAxDsqWITsQXI4ZkGiYJ5dHtRNiCpfs2OeKA=
-google.golang.org/api v0.44.0/go.mod h1:EBOGZqzyhtvMDoxwS97ctnh0zUmYY6CxqXsc1AvkYD8=
+google.golang.org/api v0.47.0/go.mod h1:Wbvgpq1HddcWVtzsVLyfLp8lDg6AA241LmgIL59tHXo=
+google.golang.org/api v0.48.0/go.mod h1:71Pr1vy+TAZRPkPs/xlCf5SsU8WjuAWv1Pfjbtukyy4=
+google.golang.org/api v0.50.0/go.mod h1:4bNT5pAuq5ji4SRZm+5QIkjny9JAyVD/3gaSihNefaw=
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 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
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 google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
@@ -570,8 +723,28 @@ google.golang.org/genproto v0.0.0-20210303154014-9728d6b83eeb/go.mod h1:FWY/as6D
 google.golang.org/genproto v0.0.0-20210310155132-4ce2db91004e/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20210319143718-93e7006c17a6/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20210402141018-6c239bbf2bb1/go.mod h1:9lPAdzaEmUacj36I+k7YKbEc5CXzPIeORRgDAUOu28A=
-google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c h1:wtujag7C+4D6KMoulW9YauvK2lgdvCMS260jsqqBXr0=
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 google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c/go.mod h1:UODoCrxHCcBojKKwX1terBiRUaqAsFqJiF615XL43r0=
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@@ -591,8 +764,16 @@ google.golang.org/grpc v1.34.0/go.mod h1:WotjhfgOW/POjDeRt8vscBtXq+2VjORFy659qA5
 google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
 google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
 google.golang.org/grpc v1.36.1/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
-google.golang.org/grpc v1.38.0 h1:/9BgsAsa5nWe26HqOlvlgJnqBuktYOLCgjCPqsa56W0=
+google.golang.org/grpc v1.37.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
+google.golang.org/grpc v1.37.1/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
 google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
+google.golang.org/grpc v1.39.0/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
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+google.golang.org/grpc v1.40.0/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
+google.golang.org/grpc v1.40.1/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
+google.golang.org/grpc v1.43.0 h1:Eeu7bZtDZ2DpRCsLhUlcrLnvYaMK1Gz86a+hMVvELmM=
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+google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0/go.mod h1:6Kw0yEErY5E/yWrBtf03jp27GLLJujG4z/JK95pnjjw=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
@@ -604,16 +785,22 @@ google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpAD
 google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0 h1:bxAC2xTBsZGibn2RTntX0oH50xLsqy1OxA9tTL3p/lk=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
+google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/ini.v1 v1.62.0 h1:duBzk771uxoUuOlyRLkHsygud9+5lrlGjdFBb4mSKDU=
-gopkg.in/ini.v1 v1.62.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/ini.v1 v1.66.2 h1:XfR1dOYubytKy4Shzc2LHrrGhU0lDCfDGG1yLPmpgsI=
+gopkg.in/ini.v1 v1.66.2/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
diff --git a/logger.go b/logger.go
new file mode 100644
index 0000000..0115067
--- /dev/null
+++ b/logger.go
@@ -0,0 +1,77 @@
+package viper
+
+import (
+	"fmt"
+
+	jww "github.com/spf13/jwalterweatherman"
+)
+
+// Logger is a unified interface for various logging use cases and practices, including:
+// 		- leveled logging
+// 		- structured logging
+type Logger interface {
+	// Trace logs a Trace event.
+	//
+	// Even more fine-grained information than Debug events.
+	// Loggers not supporting this level should fall back to Debug.
+	Trace(msg string, keyvals ...interface{})
+
+	// Debug logs a Debug event.
+	//
+	// A verbose series of information events.
+	// They are useful when debugging the system.
+	Debug(msg string, keyvals ...interface{})
+
+	// Info logs an Info event.
+	//
+	// General information about what's happening inside the system.
+	Info(msg string, keyvals ...interface{})
+
+	// Warn logs a Warn(ing) event.
+	//
+	// Non-critical events that should be looked at.
+	Warn(msg string, keyvals ...interface{})
+
+	// Error logs an Error event.
+	//
+	// Critical events that require immediate attention.
+	// Loggers commonly provide Fatal and Panic levels above Error level,
+	// but exiting and panicing is out of scope for a logging library.
+	Error(msg string, keyvals ...interface{})
+}
+
+type jwwLogger struct{}
+
+func (jwwLogger) Trace(msg string, keyvals ...interface{}) {
+	jww.TRACE.Printf(jwwLogMessage(msg, keyvals...))
+}
+
+func (jwwLogger) Debug(msg string, keyvals ...interface{}) {
+	jww.DEBUG.Printf(jwwLogMessage(msg, keyvals...))
+}
+
+func (jwwLogger) Info(msg string, keyvals ...interface{}) {
+	jww.INFO.Printf(jwwLogMessage(msg, keyvals...))
+}
+
+func (jwwLogger) Warn(msg string, keyvals ...interface{}) {
+	jww.WARN.Printf(jwwLogMessage(msg, keyvals...))
+}
+
+func (jwwLogger) Error(msg string, keyvals ...interface{}) {
+	jww.ERROR.Printf(jwwLogMessage(msg, keyvals...))
+}
+
+func jwwLogMessage(msg string, keyvals ...interface{}) string {
+	out := msg
+
+	if len(keyvals) > 0 && len(keyvals)%2 == 1 {
+		keyvals = append(keyvals, nil)
+	}
+
+	for i := 0; i <= len(keyvals)-2; i += 2 {
+		out = fmt.Sprintf("%s %v=%v", out, keyvals[i], keyvals[i+1])
+	}
+
+	return out
+}
diff --git a/remote/remote.go b/remote/remote.go
index ac3ef26..022aab2 100644
--- a/remote/remote.go
+++ b/remote/remote.go
@@ -11,7 +11,7 @@ import (
 	"io"
 	"os"
 
-	crypt "github.com/bketelsen/crypt/config"
+	crypt "github.com/sagikazarmark/crypt/config"
 
 	"github.com/spf13/viper"
 )
diff --git a/util.go b/util.go
index cee6b24..ee7a86d 100644
--- a/util.go
+++ b/util.go
@@ -18,9 +18,7 @@ import (
 	"strings"
 	"unicode"
 
-	"github.com/spf13/afero"
 	"github.com/spf13/cast"
-	jww "github.com/spf13/jwalterweatherman"
 )
 
 // ConfigParseError denotes failing to parse configuration file.
@@ -88,26 +86,14 @@ func insensitiviseMap(m map[string]interface{}) {
 	}
 }
 
-func absPathify(inPath string) string {
-	jww.INFO.Println("Trying to resolve absolute path to", inPath)
+func absPathify(logger Logger, inPath string) string {
+	logger.Info("trying to resolve absolute path", "path", inPath)
 
 	if inPath == "$HOME" || strings.HasPrefix(inPath, "$HOME"+string(os.PathSeparator)) {
 		inPath = userHomeDir() + inPath[5:]
 	}
 
-	if strings.HasPrefix(inPath, "$") {
-		end := strings.Index(inPath, string(os.PathSeparator))
-
-		var value, suffix string
-		if end == -1 {
-			value = os.Getenv(inPath[1:])
-		} else {
-			value = os.Getenv(inPath[1:end])
-			suffix = inPath[end:]
-		}
-
-		inPath = value + suffix
-	}
+	inPath = os.ExpandEnv(inPath)
 
 	if filepath.IsAbs(inPath) {
 		return filepath.Clean(inPath)
@@ -118,21 +104,9 @@ func absPathify(inPath string) string {
 		return filepath.Clean(p)
 	}
 
-	jww.ERROR.Println("Couldn't discover absolute path")
-	jww.ERROR.Println(err)
-	return ""
-}
+	logger.Error(fmt.Errorf("could not discover absolute path: %w", err).Error())
 
-// Check if file Exists
-func exists(fs afero.Fs, path string) (bool, error) {
-	stat, err := fs.Stat(path)
-	if err == nil {
-		return !stat.IsDir(), nil
-	}
-	if os.IsNotExist(err) {
-		return false, nil
-	}
-	return false, err
+	return ""
 }
 
 func stringInSlice(a string, list []string) bool {
diff --git a/viper.go b/viper.go
index 46b1a85..980ab5e 100644
--- a/viper.go
+++ b/viper.go
@@ -39,7 +39,6 @@ import (
 	"github.com/mitchellh/mapstructure"
 	"github.com/spf13/afero"
 	"github.com/spf13/cast"
-	jww "github.com/spf13/jwalterweatherman"
 	"github.com/spf13/pflag"
 	"github.com/subosito/gotenv"
 	"gopkg.in/ini.v1"
@@ -105,6 +104,9 @@ func init() {
 
 		encoderRegistry.RegisterEncoder("hcl", codec)
 		decoderRegistry.RegisterDecoder("hcl", codec)
+
+		encoderRegistry.RegisterEncoder("tfvars", codec)
+		decoderRegistry.RegisterDecoder("tfvars", codec)
 	}
 }
 
@@ -257,6 +259,8 @@ type Viper struct {
 	properties *properties.Properties
 
 	onConfigChange func(fsnotify.Event)
+
+	logger Logger
 }
 
 // New returns an initialized Viper instance.
@@ -264,7 +268,7 @@ func New() *Viper {
 	v := new(Viper)
 	v.keyDelim = "."
 	v.configName = "config"
-	v.configPermissions = os.FileMode(0644)
+	v.configPermissions = os.FileMode(0o644)
 	v.fs = afero.NewOsFs()
 	v.config = make(map[string]interface{})
 	v.override = make(map[string]interface{})
@@ -274,6 +278,7 @@ func New() *Viper {
 	v.env = make(map[string][]string)
 	v.aliases = make(map[string]string)
 	v.typeByDefValue = false
+	v.logger = jwwLogger{}
 
 	return v
 }
@@ -329,7 +334,7 @@ func NewWithOptions(opts ...Option) *Viper {
 // can use it in their testing as well.
 func Reset() {
 	v = New()
-	SupportedExts = []string{"json", "toml", "yaml", "yml", "properties", "props", "prop", "hcl", "dotenv", "env", "ini"}
+	SupportedExts = []string{"json", "toml", "yaml", "yml", "properties", "props", "prop", "hcl", "tfvars", "dotenv", "env", "ini"}
 	SupportedRemoteProviders = []string{"etcd", "consul", "firestore"}
 }
 
@@ -368,7 +373,7 @@ type RemoteProvider interface {
 }
 
 // SupportedExts are universally supported extensions.
-var SupportedExts = []string{"json", "toml", "yaml", "yml", "properties", "props", "prop", "hcl", "dotenv", "env", "ini"}
+var SupportedExts = []string{"json", "toml", "yaml", "yml", "properties", "props", "prop", "hcl", "tfvars", "dotenv", "env", "ini"}
 
 // SupportedRemoteProviders are universally supported remote providers.
 var SupportedRemoteProviders = []string{"etcd", "consul", "firestore"}
@@ -428,7 +433,7 @@ func (v *Viper) WatchConfig() {
 							v.onConfigChange(event)
 						}
 					} else if filepath.Clean(event.Name) == configFile &&
-						event.Op&fsnotify.Remove&fsnotify.Remove != 0 {
+						event.Op&fsnotify.Remove != 0 {
 						eventsWG.Done()
 						return
 					}
@@ -514,8 +519,9 @@ func AddConfigPath(in string) { v.AddConfigPath(in) }
 
 func (v *Viper) AddConfigPath(in string) {
 	if in != "" {
-		absin := absPathify(in)
-		jww.INFO.Println("adding", absin, "to paths to search")
+		absin := absPathify(v.logger, in)
+
+		v.logger.Info("adding path to search paths", "path", absin)
 		if !stringInSlice(absin, v.configPaths) {
 			v.configPaths = append(v.configPaths, absin)
 		}
@@ -539,7 +545,8 @@ func (v *Viper) AddRemoteProvider(provider, endpoint, path string) error {
 		return UnsupportedRemoteProviderError(provider)
 	}
 	if provider != "" && endpoint != "" {
-		jww.INFO.Printf("adding %s:%s to remote provider list", provider, endpoint)
+		v.logger.Info("adding remote provider", "provider", provider, "endpoint", endpoint)
+
 		rp := &defaultRemoteProvider{
 			endpoint: endpoint,
 			provider: provider,
@@ -571,7 +578,8 @@ func (v *Viper) AddSecureRemoteProvider(provider, endpoint, path, secretkeyring
 		return UnsupportedRemoteProviderError(provider)
 	}
 	if provider != "" && endpoint != "" {
-		jww.INFO.Printf("adding %s:%s to remote provider list", provider, endpoint)
+		v.logger.Info("adding remote provider", "provider", provider, "endpoint", endpoint)
+
 		rp := &defaultRemoteProvider{
 			endpoint:      endpoint,
 			provider:      provider,
@@ -1387,14 +1395,15 @@ func (v *Viper) registerAlias(alias string, key string) {
 			v.aliases[alias] = key
 		}
 	} else {
-		jww.WARN.Println("Creating circular reference alias", alias, key, v.realKey(key))
+		v.logger.Warn("creating circular reference alias", "alias", alias, "key", key, "real_key", v.realKey(key))
 	}
 }
 
 func (v *Viper) realKey(key string) string {
 	newkey, exists := v.aliases[key]
 	if exists {
-		jww.DEBUG.Println("Alias", key, "to", newkey)
+		v.logger.Debug("key is an alias", "alias", key, "to", newkey)
+
 		return v.realKey(newkey)
 	}
 	return key
@@ -1404,11 +1413,13 @@ func (v *Viper) realKey(key string) string {
 func InConfig(key string) bool { return v.InConfig(key) }
 
 func (v *Viper) InConfig(key string) bool {
+	lcaseKey := strings.ToLower(key)
+
 	// if the requested key is an alias, then return the proper key
-	key = v.realKey(key)
+	lcaseKey = v.realKey(lcaseKey)
+	path := strings.Split(lcaseKey, v.keyDelim)
 
-	_, exists := v.config[key]
-	return exists
+	return v.searchIndexableWithPathPrefixes(v.config, path) != nil
 }
 
 // SetDefault sets the default value for this key.
@@ -1453,7 +1464,7 @@ func (v *Viper) Set(key string, value interface{}) {
 func ReadInConfig() error { return v.ReadInConfig() }
 
 func (v *Viper) ReadInConfig() error {
-	jww.INFO.Println("Attempting to read in config file")
+	v.logger.Info("attempting to read in config file")
 	filename, err := v.getConfigFile()
 	if err != nil {
 		return err
@@ -1463,7 +1474,7 @@ func (v *Viper) ReadInConfig() error {
 		return UnsupportedConfigError(v.getConfigType())
 	}
 
-	jww.DEBUG.Println("Reading file: ", filename)
+	v.logger.Debug("reading file", "file", filename)
 	file, err := afero.ReadFile(v.fs, filename)
 	if err != nil {
 		return err
@@ -1484,7 +1495,7 @@ func (v *Viper) ReadInConfig() error {
 func MergeInConfig() error { return v.MergeInConfig() }
 
 func (v *Viper) MergeInConfig() error {
-	jww.INFO.Println("Attempting to merge in config file")
+	v.logger.Info("attempting to merge in config file")
 	filename, err := v.getConfigFile()
 	if err != nil {
 		return err
@@ -1575,11 +1586,12 @@ func (v *Viper) SafeWriteConfigAs(filename string) error {
 }
 
 func (v *Viper) writeConfig(filename string, force bool) error {
-	jww.INFO.Println("Attempting to write configuration to file.")
+	v.logger.Info("attempting to write configuration to file")
+
 	var configType string
 
 	ext := filepath.Ext(filename)
-	if ext != "" {
+	if ext != "" && ext != filepath.Base(filename) {
 		configType = ext[1:]
 	} else {
 		configType = v.configType
@@ -1622,7 +1634,7 @@ func (v *Viper) unmarshalReader(in io.Reader, c map[string]interface{}) error {
 	buf.ReadFrom(in)
 
 	switch format := strings.ToLower(v.getConfigType()); format {
-	case "yaml", "yml", "json", "toml", "hcl":
+	case "yaml", "yml", "json", "toml", "hcl", "tfvars":
 		err := decoderRegistry.Decode(format, buf.Bytes(), &c)
 		if err != nil {
 			return ConfigParseError{err}
@@ -1679,7 +1691,7 @@ func (v *Viper) unmarshalReader(in io.Reader, c map[string]interface{}) error {
 func (v *Viper) marshalWriter(f afero.File, configType string) error {
 	c := v.AllSettings()
 	switch configType {
-	case "yaml", "yml", "json", "toml", "hcl":
+	case "yaml", "yml", "json", "toml", "hcl", "tfvars":
 		b, err := encoderRegistry.Encode(configType, c)
 		if err != nil {
 			return ConfigMarshalError{err}
@@ -1791,7 +1803,7 @@ func mergeMaps(
 	for sk, sv := range src {
 		tk := keyExists(sk, tgt)
 		if tk == "" {
-			jww.TRACE.Printf("tk=\"\", tgt[%s]=%v", sk, sv)
+			v.logger.Trace("", "tk", "\"\"", fmt.Sprintf("tgt[%s]", sk), sv)
 			tgt[sk] = sv
 			if itgt != nil {
 				itgt[sk] = sv
@@ -1801,7 +1813,7 @@ func mergeMaps(
 
 		tv, ok := tgt[tk]
 		if !ok {
-			jww.TRACE.Printf("tgt[%s] != ok, tgt[%s]=%v", tk, sk, sv)
+			v.logger.Trace("", fmt.Sprintf("ok[%s]", tk), false, fmt.Sprintf("tgt[%s]", sk), sv)
 			tgt[sk] = sv
 			if itgt != nil {
 				itgt[sk] = sv
@@ -1812,27 +1824,38 @@ func mergeMaps(
 		svType := reflect.TypeOf(sv)
 		tvType := reflect.TypeOf(tv)
 		if tvType != nil && svType != tvType { // Allow for the target to be nil
-			jww.ERROR.Printf(
-				"svType != tvType; key=%s, st=%v, tt=%v, sv=%v, tv=%v",
-				sk, svType, tvType, sv, tv)
+			v.logger.Error(
+				"svType != tvType",
+				"key", sk,
+				"st", svType,
+				"tt", tvType,
+				"sv", sv,
+				"tv", tv,
+			)
 			continue
 		}
 
-		jww.TRACE.Printf("processing key=%s, st=%v, tt=%v, sv=%v, tv=%v",
-			sk, svType, tvType, sv, tv)
+		v.logger.Trace(
+			"processing",
+			"key", sk,
+			"st", svType,
+			"tt", tvType,
+			"sv", sv,
+			"tv", tv,
+		)
 
 		switch ttv := tv.(type) {
 		case map[interface{}]interface{}:
-			jww.TRACE.Printf("merging maps (must convert)")
+			v.logger.Trace("merging maps (must convert)")
 			tsv := sv.(map[interface{}]interface{})
 			ssv := castToMapStringInterface(tsv)
 			stv := castToMapStringInterface(ttv)
 			mergeMaps(ssv, stv, ttv)
 		case map[string]interface{}:
-			jww.TRACE.Printf("merging maps")
+			v.logger.Trace("merging maps")
 			mergeMaps(sv.(map[string]interface{}), ttv, nil)
 		default:
-			jww.TRACE.Printf("setting value")
+			v.logger.Trace("setting value")
 			tgt[tk] = sv
 			if itgt != nil {
 				itgt[tk] = sv
@@ -1867,7 +1890,7 @@ func (v *Viper) getKeyValueConfig() error {
 	for _, rp := range v.remoteProviders {
 		val, err := v.getRemoteConfig(rp)
 		if err != nil {
-			jww.ERROR.Printf("get remote config: %s", err)
+			v.logger.Error(fmt.Errorf("get remote config: %w", err).Error())
 
 			continue
 		}
@@ -2103,39 +2126,6 @@ func (v *Viper) getConfigFile() (string, error) {
 	return v.configFile, nil
 }
 
-func (v *Viper) searchInPath(in string) (filename string) {
-	jww.DEBUG.Println("Searching for config in ", in)
-	for _, ext := range SupportedExts {
-		jww.DEBUG.Println("Checking for", filepath.Join(in, v.configName+"."+ext))
-		if b, _ := exists(v.fs, filepath.Join(in, v.configName+"."+ext)); b {
-			jww.DEBUG.Println("Found: ", filepath.Join(in, v.configName+"."+ext))
-			return filepath.Join(in, v.configName+"."+ext)
-		}
-	}
-
-	if v.configType != "" {
-		if b, _ := exists(v.fs, filepath.Join(in, v.configName)); b {
-			return filepath.Join(in, v.configName)
-		}
-	}
-
-	return ""
-}
-
-// Search all configPaths for any config file.
-// Returns the first path that exists (and is a config file).
-func (v *Viper) findConfigFile() (string, error) {
-	jww.INFO.Println("Searching for config in ", v.configPaths)
-
-	for _, cp := range v.configPaths {
-		file := v.searchInPath(cp)
-		if file != "" {
-			return file, nil
-		}
-	}
-	return "", ConfigFileNotFoundError{v.configName, fmt.Sprintf("%s", v.configPaths)}
-}
-
 // Debug prints all configuration registries for debugging
 // purposes.
 func Debug() { v.Debug() }
diff --git a/viper_go1_15.go b/viper_go1_15.go
new file mode 100644
index 0000000..19a771c
--- /dev/null
+++ b/viper_go1_15.go
@@ -0,0 +1,57 @@
+//go:build !go1.16 || !finder
+// +build !go1.16 !finder
+
+package viper
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/spf13/afero"
+)
+
+// Search all configPaths for any config file.
+// Returns the first path that exists (and is a config file).
+func (v *Viper) findConfigFile() (string, error) {
+	v.logger.Info("searching for config in paths", "paths", v.configPaths)
+
+	for _, cp := range v.configPaths {
+		file := v.searchInPath(cp)
+		if file != "" {
+			return file, nil
+		}
+	}
+	return "", ConfigFileNotFoundError{v.configName, fmt.Sprintf("%s", v.configPaths)}
+}
+
+func (v *Viper) searchInPath(in string) (filename string) {
+	v.logger.Debug("searching for config in path", "path", in)
+	for _, ext := range SupportedExts {
+		v.logger.Debug("checking if file exists", "file", filepath.Join(in, v.configName+"."+ext))
+		if b, _ := exists(v.fs, filepath.Join(in, v.configName+"."+ext)); b {
+			v.logger.Debug("found file", "file", filepath.Join(in, v.configName+"."+ext))
+			return filepath.Join(in, v.configName+"."+ext)
+		}
+	}
+
+	if v.configType != "" {
+		if b, _ := exists(v.fs, filepath.Join(in, v.configName)); b {
+			return filepath.Join(in, v.configName)
+		}
+	}
+
+	return ""
+}
+
+// Check if file Exists
+func exists(fs afero.Fs, path string) (bool, error) {
+	stat, err := fs.Stat(path)
+	if err == nil {
+		return !stat.IsDir(), nil
+	}
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+	return false, err
+}
diff --git a/viper_go1_16.go b/viper_go1_16.go
new file mode 100644
index 0000000..e10172f
--- /dev/null
+++ b/viper_go1_16.go
@@ -0,0 +1,32 @@
+//go:build go1.16 && finder
+// +build go1.16,finder
+
+package viper
+
+import (
+	"fmt"
+
+	"github.com/spf13/afero"
+)
+
+// Search all configPaths for any config file.
+// Returns the first path that exists (and is a config file).
+func (v *Viper) findConfigFile() (string, error) {
+	finder := finder{
+		paths:            v.configPaths,
+		fileNames:        []string{v.configName},
+		extensions:       SupportedExts,
+		withoutExtension: v.configType != "",
+	}
+
+	file, err := finder.Find(afero.NewIOFS(v.fs))
+	if err != nil {
+		return "", err
+	}
+
+	if file == "" {
+		return "", ConfigFileNotFoundError{v.configName, fmt.Sprintf("%s", v.configPaths)}
+	}
+
+	return file, nil
+}
diff --git a/watch.go b/watch.go
index c433a8f..b5523b8 100644
--- a/watch.go
+++ b/watch.go
@@ -1,3 +1,4 @@
+//go:build !js
 // +build !js
 
 package viper


Test patch:
diff --git a/fs_test.go b/fs_test.go
new file mode 100644
index 0000000..071e346
--- /dev/null
+++ b/fs_test.go
@@ -0,0 +1,100 @@
+//go:build go1.16 && finder
+// +build go1.16,finder
+
+package viper
+
+import (
+	"io/fs"
+	"testing"
+	"testing/fstest"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestFinder(t *testing.T) {
+	t.Parallel()
+
+	fsys := fstest.MapFS{
+		"home/user/.config":            &fstest.MapFile{},
+		"home/user/config.json":        &fstest.MapFile{},
+		"home/user/config.yaml":        &fstest.MapFile{},
+		"home/user/data.json":          &fstest.MapFile{},
+		"etc/config/.config":           &fstest.MapFile{},
+		"etc/config/a_random_file.txt": &fstest.MapFile{},
+		"etc/config/config.json":       &fstest.MapFile{},
+		"etc/config/config.yaml":       &fstest.MapFile{},
+		"etc/config/config.xml":        &fstest.MapFile{},
+	}
+
+	testCases := []struct {
+		name   string
+		fsys   func() fs.FS
+		finder finder
+		result string
+	}{
+		{
+			name: "find file",
+			fsys: func() fs.FS { return fsys },
+			finder: finder{
+				paths:      []string{"etc/config"},
+				fileNames:  []string{"config"},
+				extensions: []string{"json"},
+			},
+			result: "etc/config/config.json",
+		},
+		{
+			name: "file not found",
+			fsys: func() fs.FS { return fsys },
+			finder: finder{
+				paths:      []string{"var/config"},
+				fileNames:  []string{"config"},
+				extensions: []string{"json"},
+			},
+			result: "",
+		},
+		{
+			name:   "empty search params",
+			fsys:   func() fs.FS { return fsys },
+			finder: finder{},
+			result: "",
+		},
+		{
+			name: "precedence",
+			fsys: func() fs.FS { return fsys },
+			finder: finder{
+				paths:      []string{"var/config", "home/user", "etc/config"},
+				fileNames:  []string{"aconfig", "config"},
+				extensions: []string{"zml", "xml", "json"},
+			},
+			result: "home/user/config.json",
+		},
+		{
+			name: "without extension",
+			fsys: func() fs.FS { return fsys },
+			finder: finder{
+				paths:      []string{"var/config", "home/user", "etc/config"},
+				fileNames:  []string{".config"},
+				extensions: []string{"zml", "xml", "json"},
+
+				withoutExtension: true,
+			},
+			result: "home/user/.config",
+		},
+	}
+
+	for _, testCase := range testCases {
+		testCase := testCase
+
+		t.Run(testCase.name, func(t *testing.T) {
+			t.Parallel()
+
+			fsys := testCase.fsys()
+
+			result, err := testCase.finder.Find(fsys)
+			require.NoError(t, err)
+
+			assert.Equal(t, testCase.result, result)
+		})
+	}
+}
diff --git a/internal/testutil/env.go b/internal/testutil/env_go1_16.go
similarity index 86%
rename from internal/testutil/env.go
rename to internal/testutil/env_go1_16.go
index e5eaddd..8769a44 100644
--- a/internal/testutil/env.go
+++ b/internal/testutil/env_go1_16.go
@@ -1,3 +1,6 @@
+//go:build !go1.17
+// +build !go1.17
+
 package testutil
 
 import (
@@ -18,11 +21,6 @@ func Setenv(t *testing.T, name, val string) {
 	setenv(t, name, val, true)
 }
 
-// Unsetenv unsets an environment variable for the duration of a test.
-func Unsetenv(t *testing.T, name string) {
-	setenv(t, name, "", false)
-}
-
 // setenv sets or unsets an environment variable to a temporary value for the
 // duration of the test
 func setenv(t *testing.T, name, val string, valOK bool) {
diff --git a/internal/testutil/env_go1_17.go b/internal/testutil/env_go1_17.go
new file mode 100644
index 0000000..c7bf1fe
--- /dev/null
+++ b/internal/testutil/env_go1_17.go
@@ -0,0 +1,18 @@
+//go:build go1.17
+// +build go1.17
+
+package testutil
+
+import (
+	"testing"
+)
+
+// Setenv sets an environment variable to a temporary value for the
+// duration of the test.
+//
+// This shim can be removed once support for Go <1.17 is dropped.
+func Setenv(t *testing.T, name, val string) {
+	t.Helper()
+
+	t.Setenv(name, val)
+}
diff --git a/internal/testutil/filepath.go b/internal/testutil/filepath.go
new file mode 100644
index 0000000..e49be7e
--- /dev/null
+++ b/internal/testutil/filepath.go
@@ -0,0 +1,18 @@
+package testutil
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+// AbsFilePath calls filepath.Abs on path.
+func AbsFilePath(t *testing.T, path string) string {
+	t.Helper()
+
+	s, err := filepath.Abs(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	return s
+}
diff --git a/util_test.go b/util_test.go
index 941d8a2..cb4e620 100644
--- a/util_test.go
+++ b/util_test.go
@@ -58,6 +58,8 @@ func TestCopyAndInsensitiviseMap(t *testing.T) {
 }
 
 func TestAbsPathify(t *testing.T) {
+	skipWindows(t)
+
 	home := userHomeDir()
 	homer := filepath.Join(home, "homer")
 	wd, _ := os.Getwd()
@@ -85,7 +87,7 @@ func TestAbsPathify(t *testing.T) {
 	}
 
 	for _, test := range tests {
-		got := absPathify(test.input)
+		got := absPathify(jwwLogger{}, test.input)
 		if got != test.output {
 			t.Errorf("Got %v\nexpected\n%q", got, test.output)
 		}
diff --git a/viper_test.go b/viper_test.go
index 4192748..8c864f1 100644
--- a/viper_test.go
+++ b/viper_test.go
@@ -263,13 +263,13 @@ func initDirs(t *testing.T) (string, string, func()) {
 	require.Nil(t, err)
 
 	for _, dir := range testDirs {
-		err = os.Mkdir(dir, 0750)
+		err = os.Mkdir(dir, 0o750)
 		assert.Nil(t, err)
 
 		err = ioutil.WriteFile(
 			path.Join(dir, config+".toml"),
 			[]byte("key = \"value is "+dir+"\"\n"),
-			0640)
+			0o640)
 		assert.Nil(t, err)
 	}
 
@@ -301,65 +301,192 @@ func (s *stringValue) String() string {
 	return string(*s)
 }
 
-func TestBasics(t *testing.T) {
-	SetConfigFile("/tmp/config.yaml")
-	filename, err := v.getConfigFile()
-	assert.Equal(t, "/tmp/config.yaml", filename)
-	assert.NoError(t, err)
-}
+func TestGetConfigFile(t *testing.T) {
+	t.Run("config file set", func(t *testing.T) {
+		fs := afero.NewMemMapFs()
 
-func TestSearchInPath_WithoutConfigTypeSet(t *testing.T) {
-	filename := ".dotfilenoext"
-	path := "/tmp"
-	file := filepath.Join(path, filename)
-	SetConfigName(filename)
-	AddConfigPath(path)
-	_, createErr := v.fs.Create(file)
-	defer func() {
-		_ = v.fs.Remove(file)
-	}()
-	assert.NoError(t, createErr)
-	_, err := v.getConfigFile()
-	// unless config type is set, files without extension
-	// are not considered
-	assert.Error(t, err)
-}
-
-func TestSearchInPath(t *testing.T) {
-	filename := ".dotfilenoext"
-	path := "/tmp"
-	file := filepath.Join(path, filename)
-	SetConfigName(filename)
-	SetConfigType("yaml")
-	AddConfigPath(path)
-	_, createErr := v.fs.Create(file)
-	defer func() {
-		_ = v.fs.Remove(file)
-	}()
-	assert.NoError(t, createErr)
-	filename, err := v.getConfigFile()
-	assert.Equal(t, file, filename)
-	assert.NoError(t, err)
+		err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
+		require.NoError(t, err)
+
+		_, err = fs.Create(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
+		require.NoError(t, err)
+
+		v := New()
+
+		v.SetFs(fs)
+		v.AddConfigPath("/etc/viper")
+		v.SetConfigFile(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
+
+		filename, err := v.getConfigFile()
+		assert.Equal(t, testutil.AbsFilePath(t, "/etc/viper/config.yaml"), filename)
+		assert.NoError(t, err)
+	})
+
+	t.Run("find file", func(t *testing.T) {
+		fs := afero.NewMemMapFs()
+
+		err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
+		require.NoError(t, err)
+
+		_, err = fs.Create(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
+		require.NoError(t, err)
+
+		v := New()
+
+		v.SetFs(fs)
+		v.AddConfigPath("/etc/viper")
+
+		filename, err := v.getConfigFile()
+		assert.Equal(t, testutil.AbsFilePath(t, "/etc/viper/config.yaml"), filename)
+		assert.NoError(t, err)
+	})
+
+	t.Run("find files only", func(t *testing.T) {
+		fs := afero.NewMemMapFs()
+
+		err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/config"), 0o777)
+		require.NoError(t, err)
+
+		_, err = fs.Create(testutil.AbsFilePath(t, "/etc/config/config.yaml"))
+		require.NoError(t, err)
+
+		v := New()
+
+		v.SetFs(fs)
+		v.AddConfigPath("/etc")
+		v.AddConfigPath("/etc/config")
+
+		filename, err := v.getConfigFile()
+		assert.Equal(t, testutil.AbsFilePath(t, "/etc/config/config.yaml"), filename)
+		assert.NoError(t, err)
+	})
+
+	t.Run("precedence", func(t *testing.T) {
+		fs := afero.NewMemMapFs()
+
+		err := fs.Mkdir(testutil.AbsFilePath(t, "/home/viper"), 0o777)
+		require.NoError(t, err)
+
+		_, err = fs.Create(testutil.AbsFilePath(t, "/home/viper/config.zml"))
+		require.NoError(t, err)
+
+		err = fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
+		require.NoError(t, err)
+
+		_, err = fs.Create(testutil.AbsFilePath(t, "/etc/viper/config.bml"))
+		require.NoError(t, err)
+
+		err = fs.Mkdir(testutil.AbsFilePath(t, "/var/viper"), 0o777)
+		require.NoError(t, err)
+
+		_, err = fs.Create(testutil.AbsFilePath(t, "/var/viper/config.yaml"))
+		require.NoError(t, err)
+
+		v := New()
+
+		v.SetFs(fs)
+		v.AddConfigPath("/home/viper")
+		v.AddConfigPath("/etc/viper")
+		v.AddConfigPath("/var/viper")
+
+		filename, err := v.getConfigFile()
+		assert.Equal(t, testutil.AbsFilePath(t, "/var/viper/config.yaml"), filename)
+		assert.NoError(t, err)
+	})
+
+	t.Run("without extension", func(t *testing.T) {
+		fs := afero.NewMemMapFs()
+
+		err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
+		require.NoError(t, err)
+
+		_, err = fs.Create(testutil.AbsFilePath(t, "/etc/viper/.dotfilenoext"))
+		require.NoError(t, err)
+
+		v := New()
+
+		v.SetFs(fs)
+		v.AddConfigPath("/etc/viper")
+		v.SetConfigName(".dotfilenoext")
+		v.SetConfigType("yaml")
+
+		filename, err := v.getConfigFile()
+		assert.Equal(t, testutil.AbsFilePath(t, "/etc/viper/.dotfilenoext"), filename)
+		assert.NoError(t, err)
+	})
+
+	t.Run("without extension and config type", func(t *testing.T) {
+		fs := afero.NewMemMapFs()
+
+		err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
+		require.NoError(t, err)
+
+		_, err = fs.Create(testutil.AbsFilePath(t, "/etc/viper/.dotfilenoext"))
+		require.NoError(t, err)
+
+		v := New()
+
+		v.SetFs(fs)
+		v.AddConfigPath("/etc/viper")
+		v.SetConfigName(".dotfilenoext")
+
+		_, err = v.getConfigFile()
+		// unless config type is set, files without extension
+		// are not considered
+		assert.Error(t, err)
+	})
 }
 
-func TestSearchInPath_FilesOnly(t *testing.T) {
-	fs := afero.NewMemMapFs()
+func TestReadInConfig(t *testing.T) {
+	t.Run("config file set", func(t *testing.T) {
+		fs := afero.NewMemMapFs()
 
-	err := fs.Mkdir("/tmp/config", 0777)
-	require.NoError(t, err)
+		err := fs.Mkdir("/etc/viper", 0o777)
+		require.NoError(t, err)
 
-	_, err = fs.Create("/tmp/config/config.yaml")
-	require.NoError(t, err)
+		file, err := fs.Create(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
+		require.NoError(t, err)
 
-	v := New()
+		_, err = file.Write([]byte(`key: value`))
+		require.NoError(t, err)
 
-	v.SetFs(fs)
-	v.AddConfigPath("/tmp")
-	v.AddConfigPath("/tmp/config")
+		file.Close()
 
-	filename, err := v.getConfigFile()
-	assert.Equal(t, "/tmp/config/config.yaml", filename)
-	assert.NoError(t, err)
+		v := New()
+
+		v.SetFs(fs)
+		v.SetConfigFile(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
+
+		err = v.ReadInConfig()
+		require.NoError(t, err)
+
+		assert.Equal(t, "value", v.Get("key"))
+	})
+
+	t.Run("find file", func(t *testing.T) {
+		fs := afero.NewMemMapFs()
+
+		err := fs.Mkdir(testutil.AbsFilePath(t, "/etc/viper"), 0o777)
+		require.NoError(t, err)
+
+		file, err := fs.Create(testutil.AbsFilePath(t, "/etc/viper/config.yaml"))
+		require.NoError(t, err)
+
+		_, err = file.Write([]byte(`key: value`))
+		require.NoError(t, err)
+
+		file.Close()
+
+		v := New()
+
+		v.SetFs(fs)
+		v.AddConfigPath("/etc/viper")
+
+		err = v.ReadInConfig()
+		require.NoError(t, err)
+
+		assert.Equal(t, "value", v.Get("key"))
+	})
 }
 
 func TestDefault(t *testing.T) {
@@ -382,7 +509,9 @@ func TestUnmarshaling(t *testing.T) {
 
 	unmarshalReader(r, v.config)
 	assert.True(t, InConfig("name"))
+	assert.True(t, InConfig("clothing.jacket"))
 	assert.False(t, InConfig("state"))
+	assert.False(t, InConfig("clothing.hat"))
 	assert.Equal(t, "steve", Get("name"))
 	assert.Equal(t, []interface{}{"skateboarding", "snowboarding", "go"}, Get("hobbies"))
 	assert.Equal(t, map[string]interface{}{"jacket": "leather", "trousers": "denim", "pants": map[string]interface{}{"size": "large"}}, Get("clothing"))
@@ -1239,7 +1368,9 @@ func TestReadBufConfig(t *testing.T) {
 	t.Log(v.AllKeys())
 
 	assert.True(t, v.InConfig("name"))
+	assert.True(t, v.InConfig("clothing.jacket"))
 	assert.False(t, v.InConfig("state"))
+	assert.False(t, v.InConfig("clothing.hat"))
 	assert.Equal(t, "steve", v.Get("name"))
 	assert.Equal(t, []interface{}{"skateboarding", "snowboarding", "go"}, v.Get("hobbies"))
 	assert.Equal(t, map[string]interface{}{"jacket": "leather", "trousers": "denim", "pants": map[string]interface{}{"size": "large"}}, v.Get("clothing"))
@@ -1685,7 +1816,7 @@ func TestSafeWriteConfig(t *testing.T) {
 	v.SetConfigType("yaml")
 	require.NoError(t, v.ReadConfig(bytes.NewBuffer(yamlExample)))
 	require.NoError(t, v.SafeWriteConfig())
-	read, err := afero.ReadFile(fs, "/test/c.yaml")
+	read, err := afero.ReadFile(fs, testutil.AbsFilePath(t, "/test/c.yaml"))
 	require.NoError(t, err)
 	assert.Equal(t, yamlWriteExpected, read)
 }
@@ -1702,7 +1833,7 @@ func TestSafeWriteConfigWithMissingConfigPath(t *testing.T) {
 func TestSafeWriteConfigWithExistingFile(t *testing.T) {
 	v := New()
 	fs := afero.NewMemMapFs()
-	fs.Create("/test/c.yaml")
+	fs.Create(testutil.AbsFilePath(t, "/test/c.yaml"))
 	v.SetFs(fs)
 	v.AddConfigPath("/test")
 	v.SetConfigName("c")
@@ -1738,6 +1869,23 @@ func TestSafeWriteConfigAsWithExistingFile(t *testing.T) {
 	assert.True(t, ok, "Expected ConfigFileAlreadyExistsError")
 }
 
+func TestWriteHiddenFile(t *testing.T) {
+	v := New()
+	fs := afero.NewMemMapFs()
+	fs.Create(testutil.AbsFilePath(t, "/test/.config"))
+	v.SetFs(fs)
+
+	v.SetConfigName(".config")
+	v.SetConfigType("yaml")
+	v.AddConfigPath("/test")
+
+	err := v.ReadInConfig()
+	require.NoError(t, err)
+
+	err = v.WriteConfig()
+	require.NoError(t, err)
+}
+
 var yamlMergeExampleTgt = []byte(`
 hello:
     pop: 37890
@@ -2142,7 +2290,7 @@ func newViperWithConfigFile(t *testing.T) (*Viper, string, func()) {
 	watchDir, err := ioutil.TempDir("", "")
 	require.Nil(t, err)
 	configFile := path.Join(watchDir, "config.yaml")
-	err = ioutil.WriteFile(configFile, []byte("foo: bar\n"), 0640)
+	err = ioutil.WriteFile(configFile, []byte("foo: bar\n"), 0o640)
 	require.Nil(t, err)
 	cleanup := func() {
 		os.RemoveAll(watchDir)
@@ -2159,11 +2307,11 @@ func newViperWithSymlinkedConfigFile(t *testing.T) (*Viper, string, string, func
 	watchDir, err := ioutil.TempDir("", "")
 	require.Nil(t, err)
 	dataDir1 := path.Join(watchDir, "data1")
-	err = os.Mkdir(dataDir1, 0777)
+	err = os.Mkdir(dataDir1, 0o777)
 	require.Nil(t, err)
 	realConfigFile := path.Join(dataDir1, "config.yaml")
 	t.Logf("Real config file location: %s\n", realConfigFile)
-	err = ioutil.WriteFile(realConfigFile, []byte("foo: bar\n"), 0640)
+	err = ioutil.WriteFile(realConfigFile, []byte("foo: bar\n"), 0o640)
 	require.Nil(t, err)
 	cleanup := func() {
 		os.RemoveAll(watchDir)
@@ -2198,13 +2346,16 @@ func TestWatchFile(t *testing.T) {
 		t.Logf("test config file: %s\n", configFile)
 		wg := sync.WaitGroup{}
 		wg.Add(1)
+		var wgDoneOnce sync.Once // OnConfigChange is called twice on Windows
 		v.OnConfigChange(func(in fsnotify.Event) {
 			t.Logf("config file changed")
-			wg.Done()
+			wgDoneOnce.Do(func() {
+				wg.Done()
+			})
 		})
 		v.WatchConfig()
 		// when overwriting the file and waiting for the custom change notification handler to be triggered
-		err = ioutil.WriteFile(configFile, []byte("foo: baz\n"), 0640)
+		err = ioutil.WriteFile(configFile, []byte("foo: baz\n"), 0o640)
 		wg.Wait()
 		// then the config value should have changed
 		require.Nil(t, err)
@@ -2227,10 +2378,10 @@ func TestWatchFile(t *testing.T) {
 		wg.Add(1)
 		// when link to another `config.yaml` file
 		dataDir2 := path.Join(watchDir, "data2")
-		err := os.Mkdir(dataDir2, 0777)
+		err := os.Mkdir(dataDir2, 0o777)
 		require.Nil(t, err)
 		configFile2 := path.Join(dataDir2, "config.yaml")
-		err = ioutil.WriteFile(configFile2, []byte("foo: baz\n"), 0640)
+		err = ioutil.WriteFile(configFile2, []byte("foo: baz\n"), 0o640)
 		require.Nil(t, err)
 		// change the symlink using the `ln -sfn` command
 		err = exec.Command("ln", "-sfn", dataDir2, path.Join(watchDir, "data")).Run()
@@ -2405,3 +2556,10 @@ func BenchmarkGetBoolFromMap(b *testing.B) {
 		}
 	}
 }
+
+// Skip some tests on Windows that kept failing when Windows was added to the CI as a target.
+func skipWindows(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("Skip test on Windows")
+	}
+}