[Libguestfs] [PATCH] appliance: Avoid touching appliance/supermin.d directory.

[Richard W.M. Jones]

We must avoid touching appliance/supermin.d unless it is necessary, so
that we avoid unnecessary rebuilds of the full appliance.
Unfortunately since we created temporary files there, even if we
didn't decide to keep those temporary files they would still end up
touching supermin.d.  To stop this, move the temporary files out.
---
 appliance/Makefile.am | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/appliance/Makefile.am b/appliance/Makefile.am
index fac24ed..418a6f6 100644
--- a/appliance/Makefile.am
+++ b/appliance/Makefile.am
@@ -84,17 +84,20 @@ supermin.d/daemon.tar.gz: ../daemon/guestfsd guestfsd.suppressions
 	rm -r tmp-d
 	mv $@-t $@
 
-supermin.d/excludefiles: excludefiles.in Makefile
+# Note we must avoid touching supermin.d if possible, so don't create
+# the temporary files inside the supermin.d directory.
+
+$@supermin.d/excludefiles: excludefiles.in Makefile
 	m4 $(PACKAGELIST_CPP_FLAGS) $< | \
-	grep -v '^[[:space:]]*$$' | grep -v '^#' > $@-t
-	cmp -s $@ $@-t || mv $@-t $@
-	rm -f $@-t
+	grep -v '^[[:space:]]*$$' | grep -v '^#' > excludefiles-t
+	cmp -s $@ excludefiles-t || mv excludefiles-t $@
+	rm -f excludefiles-t
 
 supermin.d/hostfiles: hostfiles.in Makefile
 	m4 $(PACKAGELIST_CPP_FLAGS) $< | \
-	grep -v '^[[:space:]]*$$' | grep -v '^#' > $@-t
-	cmp -s $@ $@-t || mv $@-t $@
-	rm -f $@-t
+	grep -v '^[[:space:]]*$$' | grep -v '^#' > hostfiles-t
+	cmp -s $@ hostfiles-t || mv hostfiles-t $@
+	rm -f hostfiles-t
 
 supermin.d/init.tar.gz: init
 	rm -f $@ $@-t
-- 
1.8.5.3