build: Add "make dist"

For creating a tarball without .git directory easier.  The tarball will
include version.ent and LFS-RELEASE files so the book rendered from it
won't show "unknown" for all dates.

.gitignore

@@ -1,4 +1,5 @@
 lfs-bootscripts-*.tar.xz
+lfs-*.tar.xz
 conditional.ent
 version.ent
 appendices/*.script

Makefile

@@ -209,5 +209,14 @@ dump-commands: validate
 
 all: book nochunks pdf dump-commands
 
-.PHONY : all book dump-commands nochunks pdf profile-html tmpdir validate md5sums wget-list version
+dist:
+	$(Q)DIST=/tmp/LFS-RELEASE ./git-version.sh $(REV)
+	$(Q)rm -f lfs-$$(</tmp/LFS-RELEASE).tar.xz
+	$(Q)tar cJf lfs-$$(</tmp/LFS-RELEASE).tar.xz \
+		$(shell git ls-tree HEAD . --name-only) version.ent \
+		-C /tmp LFS-RELEASE \
+		--transform "s,^,lfs-$$(</tmp/LFS-RELEASE)/,"
+	$(Q)echo "Generated XML tarball lfs-$$(</tmp/LFS-RELEASE).tar.xz"
+
+.PHONY : all book dump-commands nochunks pdf profile-html tmpdir validate md5sums wget-list version dist
 

git-version.sh

@@ -17,6 +17,11 @@ echo "<!ENTITY % systemd \"$SYSTEMD\">"  >> conditional.ent
 if ! git status > /dev/null; then
     # Either it's not a git repository, or git is unavaliable.
     # Just workaround.
+
+	if [ -e LFS-RELEASE ]; then
+		exit 0
+	fi
+
     echo "<![ %sysv; ["                                    >  version.ent
     echo "<!ENTITY version           \"unknown\">"         >> version.ent
     echo "]]>"                                             >> version.ent
@@ -65,3 +70,5 @@ echo "<!ENTITY version          \"$versiond\">"            >> version.ent
 echo "]]>"                                                 >> version.ent
 echo "<!ENTITY releasedate       \"$full_date\">"          >> version.ent
 echo "<!ENTITY copyrightdate     \"1999-$year\">"          >> version.ent
+
+[ -z "$DIST" ] || echo $version > "$DIST"