ports/12325: Adds refetch functionallity to bsd.port.mk on checksum mismathes

[Mark Linimon]

OK, I have a patch which **may** be what you want here.
Disclaimer: I've merely done the mechanical work, not any
logical (debugging) work.  I simply don't understand the framework
enough to even begin.

FYI the version of bsd.port.mk which the original patch was done
against was probably r1.313.  At least that's what I used as a guideline
based on the date.

--- bsd.port.mk.dist	Sat Apr  5 11:58:59 2003
+++ bsd.port.mk	Sat Apr  5 12:15:00 2003
@@ -553,6 +553,8 @@
 # FETCH_AFTER_ARGS -
 #				  Arguments to ${FETCH_CMD} following filename (default: none).
 # FETCH_ENV		- Environment to pass to ${FETCH_CMD} (default: none).
+# FETCH_REGET	- Attempts to reget a file before giving up (default: 1).
+#				  Set to 0 (null) if you don't want a reget.
 #
 # For extract:
 #
@@ -1443,11 +1445,13 @@
 .if ${OSVERSION} < 300000
 FETCH_CMD?=		/usr/bin/fetch
 .else
-FETCH_CMD?=		/usr/bin/fetch -A
+FETCH_CMD?=		/usr/bin/fetch -AaR
+FETCH_REGET?=	1
 .endif
 #FETCH_BEFORE_ARGS+=	$${CKSIZE:+-S $$CKSIZE}
 .else
 FETCH_CMD?=		/usr/bin/ftp
+FETCH_REGET?=	0
 .endif
 
 TOUCH?=			/usr/bin/touch
@@ -2505,6 +2509,24 @@
 	 for _file in ${DISTFILES}; do \
 		file=`echo $$_file | ${SED} -E -e 's/:[^:]+$$//'` ; \
 		select=`echo $${_file#$${file}} | ${SED} -e 's/^://' -e 's/,/ /g'` ; \
+		if [  -f $$file -a "${FORCE_FETCH}" = "$$file" ]; then \
+			for site in ${MASTER_SITES}; do \
+			    ${ECHO_MSG} ">> Attempting to fetch from $${site}."; \
+				DIR=${DIST_SUBDIR}; \
+				CKSIZE=`${GREP} "^SIZE ($${DIR:+$$DIR/}$$file)" ${MD5_FILE} | ${AWK} 
'{print $$4}'`; \
+				if ${SETENV} ${FETCH_ENV} ${FETCH_CMD} ${FETCH_BEFORE_ARGS} -r 
$${site}$${file} ${FETCH_AFTER_ARGS}; then \
+					if cd ${.CURDIR} && ${MAKE} checksum ; then\
+						exit 0; \
+					else \
+					 	${ECHO_MSG} "Refetch didn't help, still checksum mismatch. I'm giving 
up."; \
+						exit 1; \
+					fi; \
+				fi \
+			done; \
+			${ECHO_MSG} ">> Couldn't fetch it - please try to retrieve this";\
+			${ECHO_MSG} ">> port manually into ${_DISTDIR} and try again."; \
+			exit 1; \
+	    fi ;\
 		if [ ! -f $$file -a ! -f `${BASENAME} $$file` ]; then \
 			if [ -L $$file -o -L `${BASENAME} $$file` ]; then \
 				${ECHO_MSG} ">> ${_DISTDIR}/$$file is a broken symlink."; \
@@ -3393,6 +3415,16 @@
 				OK="false"; \
 			fi; \
 		  done; \
+		  if [ "$$OK" != "true" ] && [ ${FETCH_REGET} -gt 0 ]; then \
+			${ECHO_MSG} "===>  Refetch $$file"; \
+			if ( cd ${.CURDIR} && \
+				${MAKE} ${.MAKEFLAGS} FORCE_FETCH="$$file" FETCH_REGET="`expr 
${FETCH_REGET} - 1`" fetch); then \
+				${ECHO_MSG} ">> Successfully refetched $$file"; \
+				OK="true"; \
+			else \
+				exit 1; \
+			fi; \
+		  fi ; \
 		  if [ "$$OK" != "true" ]; then \
 			${ECHO_MSG} "Make sure the Makefile and distinfo file (${MD5_FILE})"; \
 			${ECHO_MSG} "are up to date.  If you are absolutely sure you want to 
override this"; \