Make builds incremental by preserving source/build dirs (#45)

python3-dev/build.sh

@@ -4,25 +4,18 @@ set -e
 DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null && pwd)"
 cd "$DIR"
 
-VERSION="3.12.8"
+VERSION="v3.12.8"
 INSTALL_DIR="$DIR/python3_dev/install"
 
-# Idempotent: skip if already present
-if [ -f "$INSTALL_DIR/include/Python.h" ]; then
-  echo "python3-dev headers already present, skipping."
-  exit 0
+# Clone/update source
+if [ ! -d "python3-src/.git" ]; then
+  rm -rf python3-src
+  git clone --depth 1 https://github.com/python/cpython.git python3-src
 fi
+git -C python3-src fetch --depth 1 origin "$VERSION"
+git -C python3-src checkout --force FETCH_HEAD
 
-TARBALL="Python-${VERSION}.tgz"
-URL="https://www.python.org/ftp/python/${VERSION}/${TARBALL}"
-
-echo "Downloading CPython ${VERSION} source ..."
-curl -fSL -o "$TARBALL" "$URL"
-
-echo "Extracting ..."
-tar xzf "$TARBALL"
-
-cd "Python-${VERSION}"
+cd python3-src
 
 # Run configure to generate pyconfig.h for this platform
 echo "Running configure to generate pyconfig.h ..."
@@ -34,11 +27,8 @@ cd "$DIR"
 rm -rf "$INSTALL_DIR"
 mkdir -p "$INSTALL_DIR/include"
 
-cp -r "Python-${VERSION}/Include/"* "$INSTALL_DIR/include/"
-cp "Python-${VERSION}/pyconfig.h" "$INSTALL_DIR/include/"
-
-# Clean up
-rm -rf "Python-${VERSION}" "$TARBALL"
+cp -r python3-src/Include/* "$INSTALL_DIR/include/"
+cp python3-src/pyconfig.h "$INSTALL_DIR/include/"
 
 echo "Installed python3-dev headers to $INSTALL_DIR"
 du -sh "$INSTALL_DIR"