Recover depends downloads with stale fetch stamps

depends/Makefile

@@ -83,9 +83,13 @@ download: $(foreach p,$(all_packages),$($(p)_fetched))
 # and generate share/config.site for top-level ./configure.
 # --------------------------------------------------------------------
 
-.PHONY: install install-clean reinstall install-prefix
+.PHONY: install install-clean reinstall install-prefix clean-sources
 install: install-prefix
 
+clean-sources:
+	@echo "== Removing downloaded source archives and fetch stamps"
+	@rm -rf "$(SOURCES_PATH)"
+
 install-prefix: $(packages)
 	@echo "== Installing depends into: $(host_prefix)"
 	@rm -rf "$(host_prefix)"

depends/funcs.mk

@@ -82,7 +82,12 @@ $(1)_download_path_fixed=$(subst :,\:,$$($(1)_download_path))
 #default commands
 # The default behavior for tar will try to set ownership when running as uid 0 and may not succeed, --no-same-owner disables this behavior
 $(1)_fetch_cmds ?= $(call fetch_file,$(1),$(subst \:,:,$$($(1)_download_path_fixed)),$$($(1)_download_file),$($(1)_file_name),$($(1)_sha256_hash))
-$(1)_extract_cmds ?= mkdir -p $$($(1)_extract_dir) && echo "$$($(1)_sha256_hash)  $$($(1)_source)" > $$($(1)_extract_dir)/.$$($(1)_file_name).hash &&  $(build_SHA256SUM) -c $$($(1)_extract_dir)/.$$($(1)_file_name).hash && tar --no-same-owner --strip-components=1 -xf $$($(1)_source)
+$(1)_extract_cmds ?= mkdir -p $$($(1)_extract_dir) && echo "$$($(1)_sha256_hash)  $$($(1)_source)" > $$($(1)_extract_dir)/.$$($(1)_file_name).hash && \
+  ( $(build_SHA256SUM) -c $$($(1)_extract_dir)/.$$($(1)_file_name).hash || \
+    ( rm -f $$($(1)_source) $$($(1)_fetched) && \
+      $(call fetch_file,$(1),$(subst \:,:,$$($(1)_download_path_fixed)),$$($(1)_download_file),$($(1)_file_name),$($(1)_sha256_hash)) && \
+      $(build_SHA256SUM) -c $$($(1)_extract_dir)/.$$($(1)_file_name).hash ) ) && \
+  tar --no-same-owner --strip-components=1 -xf $$($(1)_source)
 $(1)_preprocess_cmds ?=
 $(1)_build_cmds ?=
 $(1)_config_cmds ?=