Pull mpy-cross from AWS S3 instead of building.

Fall back to building if fetching fails.

Author: lesamouraipourpre

circuitpython_build_tools/build.py

@@ -26,14 +26,17 @@
 import os
 import os.path
 import pathlib
+import requests
 import semver
 import shutil
+import stat
 import sys
 import subprocess
 import tempfile
 
 IGNORE_PY = ["setup.py", "conf.py", "__init__.py"]
 GLOB_PATTERNS = ["*.py", "font5x8.bin"]
+S3_MPY_PREFIX = "https://adafruit-circuit-python.s3.amazonaws.com/bin/mpy-cross/"
 
 def version_string(path=None, *, valid_semver=False):
     version = None
@@ -64,6 +67,32 @@ def version_string(path=None, *, valid_semver=False):
 def mpy_cross(mpy_cross_filename, circuitpython_tag, quiet=False):
     if os.path.isfile(mpy_cross_filename):
         return
+
+    # Try to pull from S3
+    uname = os.uname()
+    s3_url = None
+    if uname[0] == 'Linux' and uname[4] == 'amd64':
+        s3_url = f"{S3_MPY_PREFIX}mpy-cross.static-amd64-linux-{circuitpython_tag}"
+        print(s3_url)
+    elif uname[0] == 'Linux' and uname[4] == 'armv7l':
+        s3_url = f"{S3_MPY_PREFIX}mpy-cross.static-raspbian-{circuitpython_tag}"
+        print(s3_url)
+    else:
+        print(f"\nUnable to check S3 for sysname='{uname[0]}' release='{uname[2]}' machine='{uname[4]}'.")
+        print("  Please file an issue at https://github.com/adafruit/circuitpython-build-tools/ with the above message")
+
+    if s3_url is not None:
+        print(f"Checking S3 for {s3_url}")
+        r = requests.get(s3_url)
+        if r.status_code == 200:
+            with open(mpy_cross_filename, "wb") as f:
+                f.write(r.content)
+                # Set the User Execute bit
+                os.chmod(mpy_cross_filename, os.stat(mpy_cross_filename)[0] | stat.S_IXUSR)
+                print("  FOUND")
+                return
+        print("  NOT FOUND")
+
     if not quiet:
         title = "Building mpy-cross for circuitpython " + circuitpython_tag
         print()

requirements.txt

@@ -1,3 +1,4 @@
 Click
+requests
 semver
 wheel