move patching functions and targets to patch.mk

See https://github.com/mxe/mxe/pull/1134#issuecomment-168873410
See https://github.com/mxe/mxe/pull/1134#issuecomment-169867926

1 files changed, 87 insertions, 0 deletions

diff --git a/patch.mk b/patch.mk
new file mode 100644
index 0000000..87c72d0
--- /dev/null
+++ b/patch.mk
@@ -0,0 +1,87 @@
+# This file is part of MXE.
+# See index.html for further information.
+
+GIT_DIR = $(if $(patsubst .,,$($(1)_SUBDIR)) \
+    ,$(GITS_DIR)/$($(1)_SUBDIR),$(GITS_DIR)/$(1))
+
+GIT_CMD = git \
+    --work-tree='$(call GIT_DIR,$(1))' \
+    --git-dir='$(call GIT_DIR,$(1))'/.git
+
+PATCH_NAME = 1-fixes
+
+# can't use PKG_PATCHES here, because it returns existing patches
+# while export-patch creates new patch
+PATCH_BY_NAME = $(patsubst %.mk,%-$(2).patch,$(PKG_MAKEFILES))
+
+define INIT_GIT
+    # unpack to gits/tmp/pkg
+    rm -rf '$(GITS_DIR)/tmp'
+    mkdir -p '$(GITS_DIR)/tmp/$(1)'
+    cd '$(GITS_DIR)/tmp/$(1)' && $(call UNPACK_PKG_ARCHIVE,$(1))
+    # if PKG_SUBDIR is ".", the following will move gits/tmp/pkg
+    mv '$(abspath $(GITS_DIR)/tmp/$(1)/$($(1)_SUBDIR))' '$(call GIT_DIR,$(1))'
+    rm -rf '$(GITS_DIR)/tmp'
+    # initialize git
+    $(call GIT_CMD,$(1)) init
+    $(call GIT_CMD,$(1)) add -A
+    $(call GIT_CMD,$(1)) commit -m "init"
+    $(call GIT_CMD,$(1)) tag dist
+endef
+
+define IMPORT_PATCH
+    cd '$(call GIT_DIR,$(1))' \
+        && cat '$(2)' \
+        | sed '/^From/,$$  !d' \
+        | sed s/'^From: MXE'/"From: fix@me"/'g;' \
+        | $(call GIT_CMD,$(1)) am --keep-cr ;
+endef
+
+define EXPORT_PATCH
+    cd '$(call GIT_DIR,$(1))' \
+    && ( \
+        echo 'This file is part of MXE.'; \
+        echo 'See index.html for further information.'; \
+        echo ''; \
+        echo 'Contains ad hoc patches for cross building.'; \
+        echo ''; \
+        $(call GIT_CMD,$(1)) format-patch \
+            --no-numbered \
+            -p \
+            --no-signature \
+            --stdout \
+            --text \
+            dist..HEAD \
+        | sed 's/^From [0-9a-f]\{40\} /From 0000000000000000000000000000000000000000 /' \
+        | sed 's/^index .......\.\......../index 1111111..2222222/' \
+    ) > '$(PATCH_BY_NAME)'
+endef
+
+init-git-%: download-only-%
+	$(if $(call set_is_member,$*,$(PKGS)), \
+	    $(if $(wildcard $(call GIT_DIR,$*)), \
+	        $(error $(call GIT_DIR,$*) already exists), \
+	        $(call INIT_GIT,$*)), \
+	    $(error Package $* not found in index.html))
+
+import-patch-%:
+	$(if $(call set_is_member,$*,$(PKGS)), \
+	    $(if $(wildcard $(call GIT_DIR,$*)), \
+	        $(call IMPORT_PATCH,$*,$(call PATCH_BY_NAME,$*,$(PATCH_NAME))), \
+	        $(error $(call GIT_DIR,$*) does not exist)), \
+	    $(error Package $* not found in index.html))
+
+import-all-patches-%:
+	$(if $(call set_is_member,$*,$(PKGS)), \
+	    $(if $(wildcard $(call GIT_DIR,$*)), \
+	        $(foreach PKG_PATCH,$(call PKG_PATCHES,$*), \
+	            $(call IMPORT_PATCH,$*,$(PKG_PATCH))), \
+	        $(error $(call GIT_DIR,$*) does not exist)), \
+	    $(error Package $* not found in index.html))
+
+export-patch-%:
+	$(if $(call set_is_member,$*,$(PKGS)), \
+	    $(if $(wildcard $(call GIT_DIR,$*)), \
+	        $(call EXPORT_PATCH,$*,$(PATCH_NAME)), \
+	        $(error $(call GIT_DIR,$*) does not exist)), \
+	    $(error Package $* not found in index.html))