Use the dynamic example as a default configuration.

* Makefile.am (variantsdir): New variable.
(do_subst): Use it.
(install-exec-local, uninstall-local): New targets.
* common.sh.in (DEFAULT_CONFIG): New variable.
* configure.ac: Test for MKDIR_P and LN_S.
* create: Use DEFAULT_CONFIG unless OSP_CONFIG is provided.
* verify: Don't require OSP_CONFIG.

Makefile.am

@@ -2,6 +2,7 @@ AUTOMAKE_OPTIONS = no-dist-gzip dist-lzip
 
 osname=$(subst ganeti-instance-,,$(PACKAGE))
 osdir=$(OS_DIR)/$(osname)
+variantsdir = $(DESTDIR)$(sysconfdir)/ganeti/instance-guix
 
 dist_os_SCRIPTS = create import export rename verify
 dist_os_DATA = ganeti_api_version parameters.list
@@ -20,6 +21,7 @@ EXTRA_DIST = \
 
 do_subst = sed \
 	-e 's,[@]localstatedir[@],$(localstatedir),g' \
+	-e 's,[@]variantsdir[@],$(variantsdir),g' \
 	-e 's,[@]BLOCKDEV[@],$(BLOCKDEV),g' \
 	-e 's,[@]GUIX[@],$(GUIX),g' \
 	-e 's,[@]GUIXPROFILEDIR[@],$(GUIXPROFILEDIR),g' \
@@ -28,4 +30,12 @@ do_subst = sed \
 common.sh: common.sh.in Makefile
 	$(do_subst) < $< > $@
 
+install-exec-local:
+	$(MKDIR_P) $(variantsdir)
+	$(LN_S) $(exampledir)/dynamic.scm $(variantsdir)/default.scm
+	$(MKDIR_P) $(GUIXPROFILEDIR)
+
+uninstall-local:
+	test -L $(variantsdir)/default.scm && rm -f $(variantsdir)/default.scm || true
+
 CLEANFILES = common.sh

common.sh.in

@@ -24,6 +24,7 @@ GUIX=@GUIX@
 GUIXPROFILEDIR=@GUIXPROFILEDIR@
 QEMU_IMG=@QEMU_IMG@
 
+DEFAULT_CONFIG="@variantsdir@/default.scm"
 CACHE_DIR="@localstatedir@/cache/ganeti-instance-guix"
 
 if [ $DISK_COUNT -gt 0 -a -n "$DISK_0_PATH" ]; then

configure.ac

@@ -35,6 +35,8 @@ AC_SUBST(GUIXPROFILEDIR, $guixprofiledir)
 
 # Check common programs
 AC_PROG_INSTALL
+AC_PROG_MKDIR_P
+AC_PROG_LN_S
 
 # Check for the required programs
 ROOT_PATH=[$PATH$PATH_SEPARATOR/sbin$PATH_SEPARATOR/usr/sbin]dnl

create

@@ -49,7 +49,12 @@ $GUIX --version
 # The 'gnt-instance' tool does not like being passed text that can
 # be mistaken for commands, so gibberize it through base64.
 # TODO: Support plain text for API users.
-echo "${OSP_CONFIG}" | base64 -di > $CONFIG_FILE
+if [ -n "$OSP_CONFIG" ]; then
+  echo "${OSP_CONFIG}" | base64 -di > $CONFIG_FILE
+else
+  # If no configuration file was provided, use a default one.
+  cp -L $DEFAULT_CONFIG $CONFIG_FILE
+fi
 
 if [ -b $TARGET_DEVICE ]; then
   DEVICE_SIZE=$($BLOCKDEV --getsize64 $TARGET_DEVICE)

verify

@@ -17,15 +17,6 @@
 
 set -e
 
-case "${OSP_CONFIG}" in
-    "")
-	echo "Configuration file is required."
-	exit 1
-	;;
-    *)
-	;;
-esac
-
 case "${OSP_COMMIT}" in
     "")
 	;;