Fix psplash-systemd failures

To avoid racing on FIFO creation between psplash and psplash-systemd,
enhance the systemd support by adding a call to sd_notify in psplash
after the FIFO is created. That will alow setting the psplash-start
systemd unit type to "notify" to avoid the race.

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Makefile.am

@@ -11,6 +11,8 @@ BUILT_SOURCES = psplash-poky-img.h psplash-bar-img.h
 psplash_write_SOURCES = psplash-write.c psplash.h
 
 if HAVE_SYSTEMD
+psplash_CPPFLAGS = $(SYSTEMD_CFLAGS) -DHAVE_SYSTEMD
+psplash_LDFLAGS= $(SYSTEMD_LIBS)
 bin_PROGRAMS += psplash-systemd
 psplash_systemd_CPPFLAGS = $(SYSTEMD_CFLAGS)
 psplash_systemd_LDFLAGS= $(SYSTEMD_LIBS)

psplash.c

@@ -15,6 +15,9 @@
 #include "psplash-colors.h"
 #include "psplash-poky-img.h"
 #include "psplash-bar-img.h"
+#ifdef HAVE_SYSTEMD
+#include <systemd/sd-daemon.h>
+#endif
 #include FONT_HEADER
 
 #define SPLIT_LINE_POS(fb)                                  \
@@ -285,6 +288,10 @@ main (int argc, char** argv)
 	  goto fb_fail;
     }
 
+#ifdef HAVE_SYSTEMD
+  sd_notify(0, "READY=1");
+#endif
+
   /* Clear the background with #ecece1 */
   psplash_fb_draw_rect (fb, 0, 0, fb->width, fb->height,
                         PSPLASH_BACKGROUND_COLOR);