add commit hash information + update dockerfile

Dockerfile

@@ -1,11 +1,11 @@
-FROM golang:1.16-alpine AS builder
+FROM golang:1.19-alpine AS builder
 WORKDIR /go/src/github.com/vigo/statoo
 COPY . .
-RUN apk add --no-cache git=2.34.2-r0 \
-    ca-certificates=20211220-r0 \
+RUN apk add --no-cache git=2.36.3-r0 \
+    ca-certificates=20220614-r0 \
     && CGO_ENABLED=0 \
     GOOS=linux \
-    go build -a -installsuffix cgo -o statoo .
+    go build -ldflags="-X 'github.com/vigo/statoo/app/version.CommitHash=$(git rev-parse HEAD)'" -a -installsuffix cgo -o statoo .
 
 FROM alpine:3.15
 RUN apk --no-cache add 

README.md

@@ -56,6 +56,7 @@ usage: ./statoo [-flags] URL
   -f, -find          find text in response body if -json is set, case sensitive
   -a, -auth          basic auth "username:password"
   -s, -skip          skip certificate check and hostname in that certificate (default: false)
+  -commithash        displays current build/commit hash (%s)
 
   examples:
 
@@ -155,8 +156,6 @@ Now you can pass multiple `-request-header` flags:
 statoo -request-header "Key1: Value1" -request-header "Key2: Value2" "https://ugur.ozyilmazel.com"
 ```
 
-**New**
-
 You can query/search for response headers. You can pass multiple values, all
 **case sensitive**!. Let’s lookup for `Server` and `Foo` response header values.
 `Server` value should be `GitHub.com` and `Foo` value should be `bar`:
@@ -194,6 +193,14 @@ Bash completions is available via;
 eval "$(statoo bash-completion)"
 ```
 
+**New**
+
+You can check current build/commit hash via;
+
+```bash
+statoo -commithash
+```
+
 ---
 
 ## Rake Tasks

app/app.go

@@ -40,16 +40,17 @@ var errInvalidTimeout = errors.New("invalid timeout value")
 
 // variable declarations.
 var (
-	ArgURL                string
-	OptVersionInformation *bool
-	OptTimeout            *int
-	OptVerboseOutput      *bool
-	OptJSONOutput         *bool
-	OptRequestHeaders     flags.RequestHeadersFlag
-	OptResponseHeaders    flags.ResponseHeadersFlag
-	OptFind               *string
-	OptBasicAuth          *string
-	OptInsecureSkipVerify *bool
+	ArgURL                   string
+	OptVersionInformation    *bool
+	OptCommitHashInformation *bool
+	OptTimeout               *int
+	OptVerboseOutput         *bool
+	OptJSONOutput            *bool
+	OptRequestHeaders        flags.RequestHeadersFlag
+	OptResponseHeaders       flags.ResponseHeadersFlag
+	OptFind                  *string
+	OptBasicAuth             *string
+	OptInsecureSkipVerify    *bool
 )
 
 // CLIApplication represents app structure.
@@ -87,6 +88,7 @@ func flagUsage(code int) func() {
 			defTimeout,
 			defTimeoutMin,
 			defTimeoutMax,
+			version.CommitHash,
 		)
 		if code > 0 {
 			os.Exit(code)
@@ -103,6 +105,13 @@ func NewCLIApplication() *CLIApplication {
 		false,
 		fmt.Sprintf("display version information (%s)", version.Version),
 	)
+
+	OptCommitHashInformation = flag.Bool(
+		"commithash",
+		false,
+		fmt.Sprintf("display build information (%s)", version.CommitHash),
+	)
+
 	OptVerboseOutput = flag.Bool("verbose", false, "verbose output")
 
 	helpJSON := "provides json output"
@@ -147,6 +156,11 @@ func (c *CLIApplication) Run() error {
 		return nil
 	}
 
+	if *OptCommitHashInformation {
+		fmt.Fprintln(c.Out, version.CommitHash)
+		return nil
+	}
+
 	if ArgURL == "bash-completion" {
 		fmt.Fprintln(c.Out, bashCompletion)
 		return nil

app/bash_completion.go

@@ -4,7 +4,7 @@ var bashCompletion = `__statoo_comp()
 {
     local cur next
     cur="${COMP_WORDS[COMP_CWORD]}"
-    opts="-a -auth -f -find -header -h -help -j -json -t -timeout -s -skip -verbose -version"
+    opts="-a -auth -commithash -f -find -header -h -help -j -json -t -timeout -s -skip -verbose -version"
     COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
 }
 complete -F __statoo_comp statoo`

app/usage.go

@@ -15,6 +15,7 @@ usage: %[1]s [-flags] URL
   -f, -find          find text in response body if -json is set, case sensitive
   -a, -auth          basic auth "username:password"
   -s, -skip          skip certificate check and hostname in that certificate (default: false)
+  -commithash        displays current build/commit hash (%s)
 
   examples:
   

app/version/version.go

@@ -2,3 +2,6 @@ package version
 
 // Version is the current version of statoo.
 const Version string = "2.0.1"
+
+// CommitHash represents current build/commit hash.
+var CommitHash string