Install files as current user respecting DESTDIR (#2)

* Install files as current user respecting DESTDIR

Poudriere expects to be able to build and install any package into a
staging area as non-root.  pkg(8) will sort out the permissions based
on settings in the plist.

This should also work correctly if installing directly from the github
sources: you would need to become root before running 'make install'
in any case, and consequently all the files would end up with
root:wheel ownership as expected.

* Don't require `make all` before `make install`

Ports always runs separate commands for each stage of building and
packaging the port, but other users (like github CI) may assume `make
install` does everything.

Makefile

@@ -32,34 +32,41 @@ CONFDIR=	${PREFIX}/etc
 LIBEXECDIR=	${PREFIX}/libexec
 SHAREDIR=	${PREFIX}/share
 
-DIRS=		SCRIPTSDIR
-
 SCRIPTS=	dynamic_motd
 SCRIPTSDIR=	${LIBEXECDIR}
 
-FILESGROUPS=	DOCS EXAMPLES
-
 DOCS=		CONTRIBUTING.md README.md
 DOCSDIR=	${SHAREDIR}/doc/dynamic_motd
 
 EXAMPLES=	examples/motd.subr examples/rc.motd
 EXAMPLESDIR=	${SHAREDIR}/examples/dynamic_motd
 
-CONFGROUPS=	CONFETC CONFRCD
-
 CONFETC=	rc.motd.sample
 
 CONFRCD=	rc.d/dynamic_motd
 CONFRCDDIR=	${CONFDIR}/rc.d
-CONFRCDMODE=	${BINMODE}
 
 CLEANFILES=	rc.d/dynamic_motd
 PREFIX_SUB=	-e 's,@@PREFIX@@,${PREFIX},g'
 
+INSTALL_DATA=	install -m 0644
+INSTALL_SCRIPT=	install -m 0555
+MKDIR=		mkdir -p
+
+all: rc.d/dynamic_motd
+
 rc.d/dynamic_motd: rc.d/dynamic_motd.in
 	sed ${PREFIX_SUB} ${.ALLSRC} >${.TARGET}
 
-beforeinstall: installdirs
-afterinstall: installconfig
+install: all installdirs
+	${INSTALL_SCRIPT} ${CONFRCD}  ${DESTDIR}${CONFRCDDIR}
+	${INSTALL_DATA}   ${CONFETC}  ${DESTDIR}${CONFDIR}
+	${INSTALL_SCRIPT} ${SCRIPTS}  ${DESTDIR}${SCRIPTSDIR}
+	${INSTALL_DATA}   ${DOCS}     ${DESTDIR}${DOCSDIR}
+	${INSTALL_DATA}   ${EXAMPLES} ${DESTDIR}${EXAMPLESDIR}
+
+installdirs:
+.for dir in ${CONFRCDDIR} ${CONFDIR} ${SCRIPTSDIR} ${DOCSDIR} ${EXAMPLESDIR}
+	${MKDIR} ${DESTDIR}${dir}
+.endfor
 
-.include <bsd.prog.mk>