imagebuilder: fix broken IB_STANDALONE option

Fix broken IB_STANDALONE option for OPKG due to an error in ifdef logic
where we weren't adding the required entry to reference the local files
in repositories.conf

Rework the ifdef to more explicit and restore original functionality of
this option.

While at it also provide different README for APK or OPKG.

Fixes: d788ab376f85 ("build: add APK package build capabilities")
Link: https://github.com/openwrt/openwrt/pull/15599
Signed-off-by: Christian Marangi <[email protected]>

target/imagebuilder/Makefile

@@ -43,24 +43,29 @@ $(BIN_DIR)/$(IB_NAME).tar.zst: clean
 
 	$(INSTALL_DIR) $(PKG_BUILD_DIR)/packages
 
-ifeq ($(CONFIG_IB_STANDALONE),)
 ifneq ($(CONFIG_USE_APK),)
+  ifeq ($(CONFIG_IB_STANDALONE),)
 	$(call FeedSourcesAppendAPK,$(PKG_BUILD_DIR)/repositories)
 	$(VERSION_SED_SCRIPT) $(PKG_BUILD_DIR)/repositories
+  endif
+
+	$(INSTALL_DATA) ./files/README.apk.md $(PKG_BUILD_DIR)/packages/README.md
 else
+  ifeq ($(CONFIG_IB_STANDALONE),)
 	echo '## Remote package repositories' >> $(PKG_BUILD_DIR)/repositories.conf
 	$(call FeedSourcesAppendOPKG,$(PKG_BUILD_DIR)/repositories.conf)
 	$(VERSION_SED_SCRIPT) $(PKG_BUILD_DIR)/repositories.conf
 
+  endif
+
 	# create an empty package index so `opkg` doesn't report an error
 	touch $(PKG_BUILD_DIR)/packages/Packages
-	$(INSTALL_DATA) ./files/README.md $(PKG_BUILD_DIR)/packages/
+	$(INSTALL_DATA) ./files/README.opkg.md $(PKG_BUILD_DIR)/packages/README.md
 
 	echo ''                                                        >> $(PKG_BUILD_DIR)/repositories.conf
 	echo '## This is the local package repository, do not remove!' >> $(PKG_BUILD_DIR)/repositories.conf
 	echo 'src imagebuilder file:packages'                          >> $(PKG_BUILD_DIR)/repositories.conf
 endif
-endif
 
 ifeq ($(CONFIG_BUILDBOT),)
   ifeq ($(CONFIG_IB_STANDALONE),)

target/imagebuilder/files/README.apk.md

@@ -0,0 +1,10 @@
+# ./packages folder
+
+Add `.apk` packages to this folder will allow the ImageBuilder to install them.
+
+For more complex setups consider adding a custom feed containing packages.
+
+    file:///path/to/Packages.adb
+
+Whenever the ImageBuilder builds a firmware image this folder will be reloaded
+and a new package index created.