From f070f939e125075b2e385ec39323d5f3ca9d2459 Mon Sep 17 00:00:00 2001
From: Elia Bracci <ebracci@sumologic.com>
Date: Tue, 20 Dec 2022 16:47:21 +0100
Subject: [PATCH 1/2] Added M1 fix for old tg version

---
 install.sh     |  2 +-
 lib/install.go | 23 +++++++++++++++++------
 2 files changed, 18 insertions(+), 7 deletions(-)
 mode change 100644 => 100755 install.sh

diff --git a/install.sh b/install.sh
old mode 100644
new mode 100755
index d2a0c11..c187a03
--- a/install.sh
+++ b/install.sh
@@ -337,7 +337,7 @@ End of functions from https://github.com/client9/shlib
 EOF
 
 PROJECT_NAME="tgswitch"
-OWNER=warrensbox
+OWNER=EliaBracciSumo
 REPO="tgswitch"
 BINARY=tgswitch
 FORMAT=tar.gz
diff --git a/lib/install.go b/lib/install.go
index e71741c..fc0681d 100644
--- a/lib/install.go
+++ b/lib/install.go
@@ -9,6 +9,8 @@ import (
 	"regexp"
 	"runtime"
 	"strings"
+
+	semver "github.com/hashicorp/go-version"
 )
 
 const (
@@ -140,7 +142,7 @@ func GetRecentVersions() ([]string, error) {
 	return nil, nil
 }
 
-//CreateRecentFile : create a recent file
+// CreateRecentFile : create a recent file
 func CreateRecentFile(requestedVersion string) {
 
 	installLocation = GetInstallLocation()
@@ -168,7 +170,7 @@ func ValidVersionFormat(version string) bool {
 	return semverRegex.MatchString(version)
 }
 
-//Install : Install the provided version in the argument
+// Install : Install the provided version in the argument
 func Install(tgversion string, usrBinPath string, mirrorURL string) string {
 	/* Check to see if user has permission to the default bin location which is  "/usr/local/bin/terragrunt"
 	 * If user does not have permission to default bin location, proceed to create $HOME/bin and install the tgswitch there
@@ -182,6 +184,15 @@ func Install(tgversion string, usrBinPath string, mirrorURL string) string {
 
 	goarch := runtime.GOARCH
 	goos := runtime.GOOS
+	versionObj, err := semver.NewVersion(tgversion)
+
+	// Constraint for darwin M1. Terragrunt started release arm64 versions for linux and darwin OS from version 0.28.12 included.
+	// However, amd64 versions work on darwin arm64. To be tested on linux platforms.
+	darwinM1constraint, err := semver.NewConstraint("< 0.28.12")
+	if darwinM1constraint.Check(versionObj) && goarch == "arm64" && goos == "darwin" {
+		fmt.Printf("%s satisfies constraints %s", versionObj, darwinM1constraint)
+		goarch = "amd64"
+	}
 
 	/* check if selected version already downloaded */
 	installFileVersionPath := ConvertExecutableExt(filepath.Join(installLocation, installVersion+tgversion))
@@ -244,9 +255,9 @@ func Install(tgversion string, usrBinPath string, mirrorURL string) string {
 	return ""
 }
 
-//InstallableBinLocation : Checks if terragrunt is installable in the location provided by the user.
-//If not, create $HOME/bin. Ask users to add  $HOME/bin to $PATH
-//Return $HOME/bin as install location
+// InstallableBinLocation : Checks if terragrunt is installable in the location provided by the user.
+// If not, create $HOME/bin. Ask users to add  $HOME/bin to $PATH
+// Return $HOME/bin as install location
 func InstallableBinLocation(userBinPath string) string {
 
 	usr, errCurr := user.Current()
@@ -294,7 +305,7 @@ func PrintCreateDirStmt(unableDir string, writable string) {
 	fmt.Printf("RUN `export PATH=$PATH:%s` to append bin to $PATH\n", writable)
 }
 
-//ConvertExecutableExt : convert excutable with local OS extension
+// ConvertExecutableExt : convert excutable with local OS extension
 func ConvertExecutableExt(fpath string) string {
 	switch runtime.GOOS {
 	case "windows":

From 90ac97367f667c7a6d39cb279e44d246d6c20d0e Mon Sep 17 00:00:00 2001
From: Elia Bracci <ebracci@sumologic.com>
Date: Tue, 20 Dec 2022 16:59:41 +0100
Subject: [PATCH 2/2] Added case test for M1

---
 lib/install.go   | 2 +-
 test-tgswitch.sh | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/install.go b/lib/install.go
index fc0681d..5637ac9 100644
--- a/lib/install.go
+++ b/lib/install.go
@@ -236,7 +236,7 @@ func Install(tgversion string, usrBinPath string, mirrorURL string) string {
 	/* rename unzipped file to terragrunt version name - terraform_x.x.x */
 	RenameFile(downloadedFile, installFileVersionPath)
 
-	err := os.Chmod(installFileVersionPath, 0755)
+	err = os.Chmod(installFileVersionPath, 0755)
 	if err != nil {
 		log.Println(err)
 	}
diff --git a/test-tgswitch.sh b/test-tgswitch.sh
index c1789bf..e7be098 100755
--- a/test-tgswitch.sh
+++ b/test-tgswitch.sh
@@ -82,3 +82,5 @@ runtestdir "tgswitchrc" "test_tgswitchrc" "v0.33.0"
 runtestdir ".toml" "test_tgswitchtoml" "v0.34.0"
 runtestenv "env variable" "0.37.1" "v0.37.1"
 runtestarg "passing argument" "0.36.1" "v0.36.1"
+# M1 darwin arm64 test
+runtestarg "passing argument" "0.28.0" "v0.28.0"
\ No newline at end of file