From 3dec13c1d77234f3586f17596f65c36dd32e30d0 Mon Sep 17 00:00:00 2001
From: Ben Kochie <superq@gmail.com>
Date: Mon, 25 Mar 2024 21:28:09 +0100
Subject: [PATCH] Drop support for Go older than 1.18 (#612)

We don't support Go older than 1.21 in the Go modules file, so we can
drop the special handling for older Go in the version package.

Signed-off-by: SuperQ <superq@gmail.com>
---
 version/info.go         | 49 +++++++++++++++++++++++++++++
 version/info_default.go | 25 ---------------
 version/info_go118.go   | 69 -----------------------------------------
 3 files changed, 49 insertions(+), 94 deletions(-)
 delete mode 100644 version/info_default.go
 delete mode 100644 version/info_go118.go

diff --git a/version/info.go b/version/info.go
index 044032c7..197d95e5 100644
--- a/version/info.go
+++ b/version/info.go
@@ -17,6 +17,7 @@ import (
 	"bytes"
 	"fmt"
 	"runtime"
+	"runtime/debug"
 	"strings"
 	"text/template"
 )
@@ -31,6 +32,9 @@ var (
 	GoVersion = runtime.Version()
 	GoOS      = runtime.GOOS
 	GoArch    = runtime.GOARCH
+
+	computedRevision string
+	computedTags     string
 )
 
 // versionInfoTmpl contains the template used by Info.
@@ -74,3 +78,48 @@ func Info() string {
 func BuildContext() string {
 	return fmt.Sprintf("(go=%s, platform=%s, user=%s, date=%s, tags=%s)", GoVersion, GoOS+"/"+GoArch, BuildUser, BuildDate, GetTags())
 }
+
+func GetRevision() string {
+	if Revision != "" {
+		return Revision
+	}
+	return computedRevision
+}
+
+func GetTags() string {
+	return computedTags
+}
+
+func init() {
+	computedRevision, computedTags = computeRevision()
+}
+
+func computeRevision() (string, string) {
+	var (
+		rev      = "unknown"
+		tags     = "unknown"
+		modified bool
+	)
+
+	buildInfo, ok := debug.ReadBuildInfo()
+	if !ok {
+		return rev, tags
+	}
+	for _, v := range buildInfo.Settings {
+		if v.Key == "vcs.revision" {
+			rev = v.Value
+		}
+		if v.Key == "vcs.modified" {
+			if v.Value == "true" {
+				modified = true
+			}
+		}
+		if v.Key == "-tags" {
+			tags = v.Value
+		}
+	}
+	if modified {
+		return rev + "-modified", tags
+	}
+	return rev, tags
+}
diff --git a/version/info_default.go b/version/info_default.go
deleted file mode 100644
index 684996f1..00000000
--- a/version/info_default.go
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright 2022 The Prometheus Authors
-// 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.
-
-//go:build !go1.18
-// +build !go1.18
-
-package version
-
-func GetRevision() string {
-	return Revision
-}
-
-func getTags() string {
-	return "unknown" // Not available prior to Go 1.18
-}
diff --git a/version/info_go118.go b/version/info_go118.go
deleted file mode 100644
index 992623c6..00000000
--- a/version/info_go118.go
+++ /dev/null
@@ -1,69 +0,0 @@
-// Copyright 2022 The Prometheus Authors
-// 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.
-
-//go:build go1.18
-// +build go1.18
-
-package version
-
-import "runtime/debug"
-
-var (
-	computedRevision string
-	computedTags     string
-)
-
-func GetRevision() string {
-	if Revision != "" {
-		return Revision
-	}
-	return computedRevision
-}
-
-func GetTags() string {
-	return computedTags
-}
-
-func init() {
-	computedRevision, computedTags = computeRevision()
-}
-
-func computeRevision() (string, string) {
-	var (
-		rev      = "unknown"
-		tags     = "unknown"
-		modified bool
-	)
-
-	buildInfo, ok := debug.ReadBuildInfo()
-	if !ok {
-		return rev, tags
-	}
-	for _, v := range buildInfo.Settings {
-		if v.Key == "vcs.revision" {
-			rev = v.Value
-		}
-		if v.Key == "vcs.modified" {
-			if v.Value == "true" {
-				modified = true
-			}
-		}
-		if v.Key == "-tags" {
-			tags = v.Value
-		}
-	}
-	if modified {
-		return rev + "-modified", tags
-	}
-	return rev, tags
-}