seafile: fetch sources using commit hashes instead of release tags

Avoids source filename conflicts and the need to delete source packages
at the end of the prepare stage. This has forced the buildenv to rebuild
the packages even if they were built already.

Signed-off-by: Gergely Kiss <mail.gery@gmail.com>

net/seafile-server/Makefile

@@ -9,14 +9,14 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=seafile-server
 PKG_VERSION:=3.1.7
-PKG_RELEASE:=1
+PKG_RELEASE=$(PKG_SOURCE_VERSION)
 PKG_LICENSE:=GPL-3.0
 
-PKG_BUILD_DIR:=$(BUILD_DIR)/seafile-$(PKG_VERSION)-server
-PKG_SOURCE:=v$(PKG_VERSION)-server.tar.gz
-PKG_SOURCE_URL:=https://github.com/haiwen/seafile/archive/
-PKG_MD5SUM:=af35324998b6c98fe1442d5d775871ee
-PKG_CAT:=zcat
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_URL:=https://github.com/haiwen/seafile.git
+PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
+PKG_SOURCE_VERSION:=69658fca88f258276be92447b1b4462b64a1c6b9
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 PKG_FIXUP:=autoreconf
 PKG_INSTALL:=1
 
@@ -53,13 +53,6 @@ PKG_BUILD_DEPENDS:=vala/host \
 TARGET_LDFLAGS += -Wl,-rpath-link=$(STAGING_DIR)/usr/lib -liconv \
 		    -L$(STAGING_DIR)/usr/lib/mysql -lmysqlclient -lz
 
-Hooks/Prepare/Post += delete_source_package
-
-define delete_source_package
-	# deleting downloaded source package as its filename is ambiguous
-	rm -f $(DL_DIR)/$(PKG_SOURCE)
-endef
-
 define Package/seafile-server/install
 	$(INSTALL_DIR) $(1)/usr/{bin,lib}
 	$(INSTALL_DIR) $(1)/usr/lib/python2.7/site-packages