[build] Fixing runtime check/save of last updated file for package data tarball

configure

@@ -592,6 +592,7 @@ PACKAGE_STRING='libpostal 0.1'
 PACKAGE_BUGREPORT=''
 PACKAGE_URL=''
 
+ac_unique_file="src"
 # Factoring default headers for most tests.
 ac_includes_default="\
 #include <stdio.h>
@@ -632,6 +633,7 @@ ac_header_list=
 ac_subst_vars='am__EXEEXT_FALSE
 am__EXEEXT_TRUE
 LTLIBOBJS
+LIBPOSTAL_DATA_UPDATED_PATH
 HAVE_STAT_FALSE
 HAVE_STAT_TRUE
 HAVE_DATE_STAT_FALSE
@@ -2993,6 +2995,7 @@ END
     as_fn_error $? "Your 'rm' program is bad, sorry." "$LINENO" 5
   fi
 fi
+
 case `pwd` in
   *\ * | *\	*)
     { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Libtool does not cope well with whitespace in \`pwd\`" >&5
@@ -11609,6 +11612,7 @@ CC="$lt_save_CC"
 # Only expand once:
 
 
+
 ac_config_headers="$ac_config_headers config.h"
 
 
@@ -12621,6 +12625,10 @@ else
 fi
 
 
+LAST_UPDATED_PATH=$srcdir/libpostal_data_last_updated
+LIBPOSTAL_DATA_UPDATED_PATH=$LAST_UPDATED_PATH
+
+
 cat >confcache <<\_ACEOF
 # This file is a shell script that caches the results of configure
 # tests run on this system so they can be shared between configure

configure.ac

@@ -50,4 +50,7 @@ AC_CONFIG_FILES([Makefile
 AM_CONDITIONAL([HAVE_DATE_STAT], [date -r . >/dev/null 2>&1])
 AM_CONDITIONAL([HAVE_STAT], [stat -f %Sm . >/dev/null 2>&1])
 
+LAST_UPDATED_PATH=$srcdir/libpostal_data_last_updated
+AC_SUBST([LIBPOSTAL_DATA_UPDATED_PATH], $LAST_UPDATED_PATH)
+
 AC_OUTPUT

src/Makefile.LastModified

@@ -1,5 +0,0 @@
-ifeq ("$(wildcard $(LIBPOSTAL_DATA_LAST_UPDATED))", "")
-    LAST_MODIFIED_DATE = $(EPOCH_DATE)
-else
-    LAST_MODIFIED_DATE = $(call get_last_modified,$(LIBPOSTAL_DATA_LAST_UPDATED))
-endif

src/Makefile.am

@@ -26,45 +26,43 @@ LIBPOSTAL_S3_BUCKET_NAME = libpostal
 LIBPOSTAL_S3_BUCKET_URL = http://$(LIBPOSTAL_S3_BUCKET_NAME).s3.amazonaws.com
 LIBPOSTAL_DATA_FILE = libpostal_data.tar.gz
 
+LIBPOSTAL_DATA_DIR = $(datadir)/libpostal/
+
 EPOCH_DATE = Jan  1 00:00:00 1970
 
-LIBPOSTAL_DATA_DIR = $(datadir)/libpostal/
+LAST_MODIFIED_DATE = $(EPOCH_DATE)
-LIBPOSTAL_DATA_LAST_UPDATED = $(LIBPOSTAL_DATA_DIR)libpostal_data_last_updated
+
 
 if HAVE_DATE_STAT
 USE_DATE_STAT = 1
 
-define get_last_modified
-$(shell date -d "@$$(shell cat $1)")
-endef
-
 else
 if HAVE_STAT
 USE_STAT = 1
 
-define get_last_modified
-$(shell date -r "$(shell cat $1)")
-endef
-
 else
     $(error Cannot get file modification date on this platform);
 endif
 
 endif
 
-$(eval include $(srcdir)/Makefile.LastModified)
 
 libpostal_data_mkdir:
 	mkdir -p $(LIBPOSTAL_DATA_DIR)
 
-libpostal_data.tar.gz: libpostal_data_mkdir
+libpostal_data_updated:
-	if [ `curl $(LIBPOSTAL_S3_BUCKET_URL)/$(LIBPOSTAL_DATA_FILE) -z "$(LAST_MODIFIED_DATE)" --silent --remote-time -o $(LIBPOSTAL_DATA_DIR)$(LIBPOSTAL_DATA_FILE) -w %{http_code}` = "200" ]; then	\
+	if [ ! -e @LIBPOSTAL_DATA_UPDATED_PATH@ ]; then						\
-		if [ "x$(USE_DATE_STAT)" != "x" ]; then																																						\
+		echo "$(EPOCH_DATE)" > @LIBPOSTAL_DATA_UPDATED_PATH@;			\
-			echo $$(date -d"$$(date -d "@$$(date -r $(LIBPOSTAL_DATA_DIR)$(LIBPOSTAL_DATA_FILE)) +%s") + 1 second" +%s) > $(LIBPOSTAL_DATA_LAST_UPDATED);											\
+	fi;
-		elif [ "x$(USE_STAT)" != "x" ]; then																																						\
+
-			echo $$(date -r $$(stat -f %m $(LIBPOSTAL_DATA_DIR)$(LIBPOSTAL_DATA_FILE)) -v+1S +%s) > $(LIBPOSTAL_DATA_LAST_UPDATED);																	\
+libpostal_data.tar.gz: libpostal_data_mkdir libpostal_data_updated
-		fi;																																															\
+	if [ $$(curl $(LIBPOSTAL_S3_BUCKET_URL)/$(LIBPOSTAL_DATA_FILE) -z "$$(cat @LIBPOSTAL_DATA_UPDATED_PATH@)" --silent --remote-time -o $(LIBPOSTAL_DATA_DIR)$(LIBPOSTAL_DATA_FILE) -w %{http_code}) = "200" ]; then		\
-		tar -xvzf $(LIBPOSTAL_DATA_DIR)$(LIBPOSTAL_DATA_FILE) -C $(LIBPOSTAL_DATA_DIR); 																											\
+		if [ "x$(USE_DATE_STAT)" != "x" ]; then																																												\
+			echo $$(date -d "$$(date -d "@$$(date -r $(LIBPOSTAL_DATA_DIR)$(LIBPOSTAL_DATA_FILE) +%s)") + 1 second") > @LIBPOSTAL_DATA_UPDATED_PATH@;																		\
+		elif [ "x$(USE_STAT)" != "x" ]; then																																												\
+			echo $$(date -r $$(stat -f %m $(LIBPOSTAL_DATA_DIR)$(LIBPOSTAL_DATA_FILE)) -v+1S) > @LIBPOSTAL_DATA_UPDATED_PATH@;																								\
+		fi;																																																					\
+		tar -xvzf $(LIBPOSTAL_DATA_DIR)$(LIBPOSTAL_DATA_FILE) -C $(LIBPOSTAL_DATA_DIR); 																																	\
 	fi;
 
 address_dictionary_builder: address_dictionary_builder.c