Merge pull request #178 from axw/gorm-go1.9

module/apmgorm: require Go 1.9+

Makefile

@@ -10,7 +10,9 @@ check-goimports:
 
 .PHONY: check-dockerfile-testing
 check-dockerfile-testing:
+ifeq ($(shell go run ./scripts/mingoversion.go -print 1.9),true)
 	go run ./scripts/gendockerfile.go -d
+endif
 
 .PHONY: check-lint
 check-lint:

module/apmgorm/apmgorm_test.go

@@ -1,3 +1,5 @@
+// +build go1.9
+
 package apmgorm_test
 
 import (

module/apmgorm/context.go

@@ -1,3 +1,5 @@
+// +build go1.9
+
 package apmgorm
 
 import (

module/apmgorm/doc.go

@@ -1,2 +1,4 @@
+// +build go1.9
+
 // Package apmgorm provides wrappers for tracing GORM operations.
 package apmgorm

module/apmgorm/open.go

@@ -1,3 +1,5 @@
+// +build go1.9
+
 package apmgorm
 
 import (

scripts/mingoversion.go

@@ -0,0 +1,75 @@
+// +build ignore
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"regexp"
+	"runtime"
+	"strconv"
+)
+
+var (
+	printFlag = flag.Bool("print", false, "Print true or false, and always exit with 0 except in case of usage errors")
+)
+
+func main() {
+	flag.Parse()
+	if flag.NArg() == 0 {
+		fmt.Fprintf(os.Stderr, "Usage: %s <minimum-version>\n", os.Args)
+		os.Exit(2)
+	}
+
+	re := regexp.MustCompile(`^(?:go)?(\d+).(\d+)(?:\.(\d+))?$`)
+	arg := flag.Arg(0)
+	argSubmatch := re.FindStringSubmatch(arg)
+	if argSubmatch == nil {
+		fmt.Fprintln(os.Stderr, "Invalid minimum-version: expected x.y or x.y.z")
+		os.Exit(2)
+	}
+
+	runtimeVersion := runtime.Version()
+	goSubmatch := re.FindStringSubmatch(runtimeVersion)
+	if goSubmatch == nil {
+		fmt.Fprintln(os.Stderr, "Failed to parse runtime.Version(%s)", runtimeVersion)
+		os.Exit(3)
+	}
+
+	result := true
+	minVersion := makeInts(argSubmatch[1:])
+	goVersion := makeInts(goSubmatch[1:])
+	for i := range minVersion {
+		n := goVersion[i] - minVersion[i]
+		if n < 0 {
+			if *printFlag {
+				result = false
+			} else {
+				fmt.Fprintf(os.Stderr, "%s < %s\n", runtimeVersion, arg)
+				os.Exit(1)
+			}
+		}
+		if n > 0 {
+			break
+		}
+	}
+	if *printFlag {
+		fmt.Println(result)
+	}
+}
+
+func makeInts(s []string) []int {
+	ints := make([]int, len(s))
+	for i, s := range s {
+		if s == "" {
+			s = "0"
+		}
+		n, err := strconv.Atoi(s)
+		if err != nil {
+			panic(err)
+		}
+		ints[i] = n
+	}
+	return ints
+}