build: fix python frozen modules generation

The problem was due to duplicate modules present both in the base frozen
modules and also in the extra modules list file.

This commit should allow us to import gdb and pygments again.

Makefile

@@ -13,6 +13,8 @@ BUILD_PACKAGES_DIR := "build/packages"
 
 .PHONY: clean help download_packages build build-docker-image $(ALL_TARGETS) $(ALL_PACK_TARGETS)
 
+.NOTPARALLEL: build pack
+
 help:
 	@echo "Usage:"
 	@echo "  make build"

src/compilation/download_packages.sh

@@ -64,11 +64,6 @@ function download_package() {
     local url="$1"
     local output="$2"
 
-    if [[ -f "$output" ]]; then
-        >&2 echo "Skipping download: $output already exists"
-        return 0
-    fi
-
     wget "$url" -O "$output"
     if [[ $? -ne 0 ]]; then
         >&2 echo "Error: failed to download $url"
@@ -98,11 +93,6 @@ function extract_package() {
         return 1
     fi
 
-    if [[ -d "$output_dir" ]]; then
-        >&2 echo "Skipping extraction: $output_dir already exists"
-        return 0
-    fi
-
     pushd "$temp_dir" > /dev/null
 
     unpack_tarball "$tarball_realpath"
@@ -113,6 +103,10 @@ function extract_package() {
 
     popd > /dev/null
 
+    # Make sure output dir is empty, so we could move content into it.
+    # The directory might not exist, so we need to pass || true so that set -e won't fail us.
+    rm -rf "$output_dir" || true
+
     mv "$temp_dir/$package_dir" "$output_dir"
     if [[ $? -ne 0 ]]; then
         return 1

src/compilation/frozen_python_modules.txt

@@ -1,4 +1,3 @@
-abc
 _aix_support
 antigravity
 argparse
@@ -8,7 +7,6 @@ bdb
 bisect
 calendar
 cmd
-codecs
 codeop
 code
 <collections.**.*>
@@ -54,7 +52,6 @@ hmac
 imaplib
 <importlib.**.*>
 inspect
-io
 ipaddress
 <json.**.*>
 keyword