Add infrastructure necessary to build the release notes with the web

site.  This is currently conditional on BUILD_RELNOTES being set,
which it isn't by default.  See the README for more information.

Discussed with:	bmah

en/Makefile

@@ -1,4 +1,4 @@
-# $FreeBSD: www/en/Makefile,v 1.64 2001/04/22 17:34:53 wosch Exp $
+# $FreeBSD: www/en/Makefile,v 1.65 2001/04/25 22:51:43 wosch Exp $
 .if exists(Makefile.conf)
 .include "Makefile.conf"
 .endif
@@ -48,6 +48,9 @@ SUBDIR+= conspectus
 SUBDIR+= ports
 SUBDIR+= doc
 .endif
+.if defined(BUILD_RELNOTES)
+SUBDIR+= relnotes
+.endif
 
 # These *must* be listed after the "doc" subdir, as they create symlinks
 # in to it.

en/relnotes/Makefile

@@ -0,0 +1,29 @@
+#
+# Web site build hooks for the release notes.  Also see the README file.
+#
+# The variable RELNOTES (I couldn't think of a better name) is a poor
+# man's list.  Its semantics are very similar to that of MLINKS (see
+# bsd.man.mk).  The first word is the directory under which that set
+# of relnotes should appear on the web site.  The second word is the
+# path to that relnotes set.
+#
+# $FreeBSD$
+#
+
+RELNOTES=	CURRENT ${.CURDIR}/../../../src/release/doc
+
+all install clean obj:
+	@set ${RELNOTES}; \
+	while :; do \
+		case $$# in \
+			0) break;; \
+			1) echo "bad \$$RELNOTES value"; false; break;; \
+		esac; \
+		webname=$$1; shift; realpath=$$1; shift; \
+		(unset DESTDIR || true; \
+			cd $$realpath && ${MAKE} \
+				FORMATS=html\ html-split \
+				DOCDIR=${DESTDIR}/data/${.CURDIR:T}/$$webname \
+				DIRPRFX=${.CURDIR:T}/$$webname/ \
+				${.TARGET}); \
+	done;

en/relnotes/README

@@ -0,0 +1,39 @@
+Web site hooks for the release notes (-*- text -*-).
+$FreeBSD$
+
+
+To enable building the release notes with the web site, edit Makefile
+in this directory and set the RELNOTES variable, then set
+BUILD_RELNOTES when you build the web site as you would, say,
+ENGLISH_ONLY.  The RELNOTES variable a list; the first word is the
+"name" of these release notes, and the second word is the path to the
+root of the release notes set.  The semantics are similar to those of
+MLINKS in bsd.man.mk.  It would be nice if the list ($RELNOTES) could
+be set on the command line a la BUILD_RELNOTES instead of having to be
+changed in the Makefile, but that would require modifications to
+web.site.mk to teach it to propagate the RELNOTES variable when
+running make for SUBDIRs.
+
+For example, if you want to build the release notes for -CURRENT and
+4-STABLE, and they are checked out in /usr/relnotes/current and
+/usr/relnotes/4stable, respectively, you might use the following:
+
+	RELNOTES=	CURRENT /usr/relnotes/current
+	RELNOTES+=	4STABLE /usr/relnotes/4stable
+
+Note that you shouldn't simply use 'STABLE' as a name, since there may
+be multiple -STABLE branches.  Also note that at the time of this
+writing, the release notes are still kept as flat files in RELENG_4,
+so the above is for demonstration purposes only.
+
+Obviously if you're going to do this, you're going to have to make
+sure the release notes are updated along with the rest of the www/ and
+doc/ hierarchies.
+
+It would be nice if all the mirrors used the same "names"; freefall
+would be the ideal place to set the precedent, but unfortunately it's
+not building the release notes yet.  If you're a mirror that wants to
+set this up, please send e-mail to the freebsd-doc list asking what
+you should use, and be prepared to change when freefall catches up.
+
+If you have any questions, please e-mail the freebsd-doc list.