Add go.mod and go.sum for upgrade (#978)

* Add go.mod and go.sum for upgrade

* Fix upgrade tools to have to run on upgrade directory

3 files changed, 37 insertions, 11 deletions

diff --git a/upgrade/go.mod b/upgrade/go.mod
new file mode 100644
index 0000000..caf97ff
--- /dev/null
+++ b/upgrade/go.mod
@@ -0,0 +1,5 @@
+module github.com/mattn/go-sqlite3/upgrade
+
+go 1.16
+
+require github.com/PuerkitoBio/goquery v1.7.1 // indirect
diff --git a/upgrade/go.sum b/upgrade/go.sum
new file mode 100644
index 0000000..986201f
--- /dev/null
+++ b/upgrade/go.sum
@@ -0,0 +1,12 @@
+github.com/PuerkitoBio/goquery v1.7.1 h1:oE+T06D+1T7LNrn91B4aERsRIeCLJ/oPSa6xB9FPnz4=
+github.com/PuerkitoBio/goquery v1.7.1/go.mod h1:XY0pP4kfraEmmV1O7Uf6XyjoslwsneBbgeDjLYuN8xY=
+github.com/andybalholm/cascadia v1.2.0 h1:vuRCkM5Ozh/BfmsaTm26kbjm0mIOM3yS5Ek/F5h18aE=
+github.com/andybalholm/cascadia v1.2.0/go.mod h1:YCyR8vOZT9aZ1CHEd8ap0gMVm2aFgxBp0T0eFw1RUQY=
+golang.org/x/net v0.0.0-20180218175443-cbe0f9307d01/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20210614182718-04defd469f4e h1:XpT3nA5TvE525Ne3hInMh6+GETgn27Zfm9dxsThnX2Q=
+golang.org/x/net v0.0.0-20210614182718-04defd469f4e/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
diff --git a/upgrade/upgrade.go b/upgrade/upgrade.go
index 50d7d9c..9652c67 100644
--- a/upgrade/upgrade.go
+++ b/upgrade/upgrade.go
@@ -1,5 +1,5 @@
-// +build !cgo
-// +build upgrade,ignore
+//go:build !cgo && upgrade && ignore
+// +build !cgo,upgrade,ignore
 
 package main
 
@@ -98,16 +98,25 @@ func mergeFile(src string, dst string) error {
 func main() {
 	fmt.Println("Go-SQLite3 Upgrade Tool")
 
+	wd, err := os.Getwd()
+	if err != nil {
+		log.Fatal(err)
+	}
+	if filepath.Base(wd) != "upgrade" {
+		log.Printf("Current directory is %q but should run in upgrade directory", wd)
+		os.Exit(1)
+	}
+
 	// Download Amalgamation
 	_, amalgamation, err := download("sqlite-amalgamation-")
 	if err != nil {
-		fmt.Println("Failed to download: sqlite-amalgamation; %s", err)
+		log.Fatalf("Failed to download: sqlite-amalgamation; %s", err)
 	}
 
 	// Download Source
 	_, source, err := download("sqlite-src-")
 	if err != nil {
-		fmt.Println("Failed to download: sqlite-src; %s", err)
+		log.Fatalf("Failed to download: sqlite-src; %s", err)
 	}
 
 	// Create Amalgamation Zip Reader
@@ -127,11 +136,11 @@ func main() {
 		var f *os.File
 		switch path.Base(zf.Name) {
 		case "sqlite3.c":
-			f, err = os.Create("sqlite3-binding.c")
+			f, err = os.Create("../sqlite3-binding.c")
 		case "sqlite3.h":
-			f, err = os.Create("sqlite3-binding.h")
+			f, err = os.Create("../sqlite3-binding.h")
 		case "sqlite3ext.h":
-			f, err = os.Create("sqlite3ext.h")
+			f, err = os.Create("../sqlite3ext.h")
 		default:
 			continue
 		}
@@ -186,9 +195,9 @@ func main() {
 		var f *os.File
 		switch path.Base(zf.Name) {
 		case "userauth.c":
-			f, err = os.Create("userauth.c")
+			f, err = os.Create("../userauth.c")
 		case "sqlite3userauth.h":
-			f, err = os.Create("userauth.h")
+			f, err = os.Create("../userauth.h")
 		default:
 			continue
 		}
@@ -211,10 +220,10 @@ func main() {
 	}
 
 	// Merge SQLite User Authentication into amalgamation
-	if err := mergeFile("userauth.c", "sqlite3-binding.c"); err != nil {
+	if err := mergeFile("../userauth.c", "../sqlite3-binding.c"); err != nil {
 		log.Fatal(err)
 	}
-	if err := mergeFile("userauth.h", "sqlite3-binding.h"); err != nil {
+	if err := mergeFile("../userauth.h", "../sqlite3-binding.h"); err != nil {
 		log.Fatal(err)
 	}