Prepare scripts for Apple Silicon M1

Author: hannesa2

script/bootstrap

@@ -43,7 +43,7 @@ check_deps ()
         echo "Homebrew is not installed (http://brew.sh). You will need to manually ensure the following tools are installed:"
         echo "  $REQUIRED_TOOLS"
         echo
-        echo "Additionally, the following libssh2 files must be symlinked under /usr/local:"
+        echo "Additionally, the following libssh2 files must be symlinked under /usr/local or /opt/homebrew :"
         echo "  lib/libssh2.a include/libssh2.h include/libssh2_sftp.h include/libssh2_publickey.h"
         exit $result
     fi
@@ -70,7 +70,13 @@ check_deps ()
     done
 
     brew_prefix=`brew --prefix`
-    expected_prefix=/usr/local
+    if [[ `uname -m` == 'arm64' ]]; then
+      echo "Running on a Apple Silicon M1"
+      export expected_prefix=/opt/homebrew
+    else
+      echo "Running on a Apple x86"
+      export expected_prefix=/usr/local
+    fi
 
     if [ "$brew_prefix" != "$expected_prefix" ]
     then

script/update_libgit2

@@ -2,11 +2,6 @@
 
 set -e
 
-# augment path to help it find cmake installed in /usr/local/bin,
-# e.g. via brew. Xcode's Run Script phase doesn't seem to honor
-# ~/.MacOSX/environment.plist
-PATH="/usr/local/bin:$PATH"
-
 cd "External/libgit2"
 
 if [ -d "build" ]; then
@@ -17,10 +12,22 @@ mkdir build
 cd build
 
 # OpenSSL is keg-only, so add its pkgconfig location manually
-export PKG_CONFIG_PATH=/usr/local/opt/openssl/lib/pkgconfig
+if [[ `uname -m` == 'arm64' ]]; then
+  echo "Running on a Apple Silicon M1"
+  export ARCH_PREFIX=/opt/homebrew
+else
+  echo "Running on a Apple x86"
+  export ARCH_PREFIX=/usr/local
+fi
+export PKG_CONFIG_PATH=$ARCH_PREFIX/opt/openssl/lib/pkgconfig
+
+# augment path to help it find cmake installed in /usr/local/bin,
+# e.g. via brew. Xcode's Run Script phase doesn't seem to honor
+# ~/.MacOSX/environment.plist
+PATH="$ARCH_PREFIX/bin:$PATH"
 
 cmake -DBUILD_SHARED_LIBS:BOOL=OFF \
-    -DLIBSSH2_INCLUDE_DIRS:PATH=/usr/local/include/ \
+    -DLIBSSH2_INCLUDE_DIRS:PATH=$ARCH_PREFIX/include/ \
     -DBUILD_CLAR:BOOL=OFF \
     -DTHREADSAFE:BOOL=ON \
     ..