apk: add package

APK (Alpine Package Keeper) is the package manager of Alpine Linux and
has multiple advantages over OPKG. While Alpine uses APK version 2, this
commit adds version 3 with a heavily optimised database structure and
additional feature making it suitable for OpenWrt.

This commit will be followed by many more to add APK build capabilities
to the OpenWrt build system, firstly enabling side by side builds of APK
and OPKG packages, later replacing OPKG entirely.

Signed-off-by: Paul Spooren <[email protected]>

package/system/apk/Makefile

@@ -0,0 +1,87 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=apk
+PKG_RELEASE:=1
+
+PKG_SOURCE_URL=https://gitlab.alpinelinux.org/alpine/apk-tools.git
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_DATE:=2024-04-16
+PKG_SOURCE_VERSION:=ba6c31a5469ef74fb85119508e55de9631ffef41
+PKG_MIRROR_HASH:=3455d5799481add9ece3db685576d58be6303f3a13140133979b965cbd3c9966
+
+PKG_VERSION=3.0.0_pre$(subst -,,$(PKG_SOURCE_DATE))
+
+PKG_MAINTAINER:=Paul Spooren <[email protected]>
+PKG_LICENSE:=GPL-2.0-only
+PKG_LICENSE_FILES:=LICENSE
+PKG_INSTALL:=1
+
+HOST_BUILD_PREFIX:=$(STAGING_DIR_HOST)
+HOST_BUILD_DEPENDS:=lua/host
+PKG_BUILD_DEPENDS:=$(HOST_BUILD_DEPENDS)
+
+include $(INCLUDE_DIR)/package.mk
+include $(INCLUDE_DIR)/host-build.mk
+include $(INCLUDE_DIR)/meson.mk
+
+define Package/apk/default
+  SECTION:=base
+  CATEGORY:=Base system
+  TITLE:=apk package manager
+  DEPENDS:=+zlib
+  URL:=$(PKG_SOURCE_URL)
+endef
+
+define Package/apk-mbedtls
+  $(Package/apk/default)
+  TITLE += (mbedtls)
+  DEPENDS +=+libmbedtls
+  VARIANT:=mbedtls
+  DEFAULT_VARIANT:=1
+  CONFLICTS:=apk-openssl
+endef
+
+define Package/apk-openssl
+  $(Package/apk/default)
+  TITLE += (openssl)
+  DEPENDS +=+libopenssl
+  VARIANT:=openssl
+endef
+
+MESON_HOST_VARS+=VERSION=$(PKG_VERSION)
+MESON_VARS+=VERSION=$(PKG_VERSION)
+
+MESON_HOST_ARGS += \
+	-Dlua_version=5.1 \
+	-Dcompressed-help=false \
+	-Ddocs=disabled \
+	-Dcrypto_backend=openssl \
+	-Dzstd=false
+
+MESON_ARGS += \
+	-Dlua_version=5.1 \
+	-Dcompressed-help=false \
+	-Ddocs=disabled \
+	-Durl_backend=wget \
+	-Dcrypto_backend=$(BUILD_VARIANT) \
+	-Dzstd=false
+
+HOST_LDFLAGS += \
+	-Wl,-rpath $(STAGING_DIR_HOST)/lib
+
+define Package/apk/default/install
+	$(INSTALL_DIR) $(1)/lib/apk/db
+
+	$(INSTALL_DIR) $(1)/usr/bin
+	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/bin/apk $(1)/usr/bin/apk
+
+	$(INSTALL_DIR) $(1)/usr/lib
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libapk.so.* $(1)/usr/lib/
+endef
+
+Package/apk-mbedtls/install = $(Package/apk/default/install)
+Package/apk-openssl/install = $(Package/apk/default/install)
+
+$(eval $(call BuildPackage,apk-mbedtls))
+$(eval $(call BuildPackage,apk-openssl))
+$(eval $(call HostBuild))

package/system/apk/patches/0001-openwrt-move-layer-db-to-temp-folder.patch

@@ -0,0 +1,21 @@
+From 9918c683fcc2f148328332d58d030ec5750a1473 Mon Sep 17 00:00:00 2001
+From: Paul Spooren <[email protected]>
+Date: Sat, 19 Feb 2022 17:20:37 +0100
+Subject: [PATCH 1/4] openwrt: move layer db to temp folder
+
+Signed-off-by: Paul Spooren <[email protected]>
+---
+ src/database.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/src/database.c
++++ b/src/database.c
+@@ -1604,7 +1604,7 @@ const char *apk_db_layer_name(int layer)
+ {
+ 	switch (layer) {
+ 	case APK_DB_LAYER_ROOT: return "lib/apk/db";
+-	case APK_DB_LAYER_UVOL: return "lib/apk/db-uvol";
++	case APK_DB_LAYER_UVOL: return "tmp/run/uvol/.meta/apk";
+ 	default:
+ 		assert("invalid layer");
+ 		return 0;