Merge pull request tfutils#351 from denizgenc/fix_mac_arch_selection

Improve `TFENV_ARCH` initialisation for Apple Silicon Macs

Author: Zordrak

libexec/tfenv-install

@@ -82,49 +82,64 @@ if [ -f "${dst_path}/terraform" ]; then
   exit 0;
 fi;
 
-# Add support of ARM64 for Linux & Apple Silicon
-case "$(uname -m)" in
-  aarch64* | arm64*)
-    # There is no arm64 support for versions:
-    # < 0.11.15
-    # >= 0.12.0, < 0.12.30
-    # >= 0.13.0, < 0.13.5
-    if [[ "${version}" =~ 0\.(([0-9]|10))\.\d* ||
-          "${version}" =~ 0\.11\.(([0-9]|1[0-4]))$ ||
-          "${version}" =~ 0\.12\.(([0-9]|[1-2][0-9]))$ ||
-          "${version}" =~ 0\.13\.[0-4]$
-    ]]; then
-      TFENV_ARCH="${TFENV_ARCH:-amd64}";
-    else
-      TFENV_ARCH="${TFENV_ARCH:-arm64}";
-    fi;
-    ;;
-  *)
-    TFENV_ARCH="${TFENV_ARCH:-amd64}";
-    ;;
-esac;
-
 case "$(uname -s)" in
   Darwin*)
-    os="darwin_${TFENV_ARCH}";
+    kernel="darwin";
     ;;
   MINGW64*)
-    os="windows_${TFENV_ARCH}";
+    kernel="windows";
     ;;
-  MSYS_NT*)
-    os="windows_${TFENV_ARCH}";
+  MSYSNT*)
+    kernel="windows";
     ;;
-  CYGWIN_NT*)
-    os="windows_${TFENV_ARCH}";
+  CYGWINNT*)
+    kernel="windows";
     ;;
   FreeBSD*)
-    os="freebsd_${TFENV_ARCH}";
+    kernel="freebsd";
     ;;
   *)
-    os="linux_${TFENV_ARCH}";
+    kernel="linux";
     ;;
 esac;
 
+# Add support of ARM64 for Linux & Apple Silicon
+case "$(uname -m)" in
+  aarch64* | arm64*)
+    case "${kernel}" in
+      "linux")
+        # There is no arm64 support for versions:
+        # < 0.11.15
+        # >= 0.12.0, < 0.12.30
+        # >= 0.13.0, < 0.13.5
+        if [[ "${version}" =~ 0\.(([0-9]|10))\.\d* ||
+              "${version}" =~ 0\.11\.(([0-9]|1[0-4]))$ ||
+              "${version}" =~ 0\.12\.(([0-9]|[1-2][0-9]))$ ||
+              "${version}" =~ 0\.13\.[0-4]$
+        ]]; then
+          TFENV_ARCH="${TFENV_ARCH:-amd64}";
+        else
+          TFENV_ARCH="${TFENV_ARCH:-arm64}";
+        fi;
+      ;;
+      "darwin")
+        # No Apple Silicon builds before 1.0.2
+        if [[ "${version}" =~ 0\..+$ || "${version}" =~ 1\.0\.0|1$
+        ]]; then
+          TFENV_ARCH="${TFENV_ARCH:-amd64}";
+        else
+          TFENV_ARCH="${TFENV_ARCH:-arm64}";
+        fi;
+      ;;
+    esac;
+    ;;
+  *)
+    TFENV_ARCH="${TFENV_ARCH:-amd64}";
+    ;;
+esac;
+
+os="${kernel}_${TFENV_ARCH}"
+
 keybase_bin="$(command -v keybase 2>/dev/null)";
 shasum_bin="$(command -v shasum 2>/dev/null)";
 sha256sum_bin="$(command -v sha256sum 2>/dev/null)";