Installer: Check macOS version in bootstrap script

On early macOS 11 versions (for instance 11.0.1), the `arch -arm64 ls` command
fails (“Bad CPU type in executable” error), and the Python script cannot start
in recoveryOS because the Python binary is not signed by Apple.

To avoid these issues, add an early version check (version >= 12) in the
bootstrap script.

Fixes issue #114.

Signed-off-by: Vincent Duvert <[email protected]>

Author: VinDuv

src/install.sh

@@ -18,6 +18,23 @@ export SSL_CERT_FILE=$PWD/Frameworks/Python.framework/Versions/Current/etc/opens
 # so do it again for good measure.
 export PATH="$PWD/bin:/usr/bin:/bin:/usr/sbin:/sbin:$PATH"
 
+
+set +e
+macos_ver=$(/usr/libexec/PlistBuddy -c "Print :ProductVersion" \
+	/System/Library/CoreServices/SystemVersion.plist)
+res=$?
+set -e
+
+if [ "$res" -ne 0 ] || [ -z "$macos_ver" ]; then
+    echo "Unable to determine macOS version. Please report a bug."
+    exit 1
+fi
+
+if [ "${macos_ver%%.*}" -lt 12 ]; then
+    echo "This installer requires macOS 12.3 or later."
+    exit 1
+fi
+
 if ! arch -arm64 ls >/dev/null 2>/dev/null; then
     echo
     echo "Looks like this is an Intel Mac!"