ioemu: empty vnc passwd

[Samuel Thibault <samuel.thibault@eu.citrix.com>]

Hello,

There is a small bug in xenstore.c: the following patch is needed
because else xenstore_read_vncpasswd would return 0 even when it is
unable to read the passwd.

diff -r 9e92672385a5 tools/ioemu/xenstore.c
--- a/tools/ioemu/xenstore.c	Wed Jan 23 13:37:03 2008 +0000
+++ b/tools/ioemu/xenstore.c	Wed Jan 23 15:53:01 2008 +0000
@@ -518,7 +518,7 @@ int xenstore_read_vncpasswd(int domid, c
         pwbuf[0] = '\0';
         free(uuid);
         free(path);
-        return rc;
+        return -1;
     }
 
     for (i=0; i<len && i<pwbuflen; i++) {

However, that means we can't use an empty passwd any more, while that
may be quite useful e.g. in testing environments, so that we would need
the following patch:

diff -r 9e92672385a5 tools/ioemu/vl.c
--- a/tools/ioemu/vl.c	Wed Jan 23 13:37:03 2008 +0000
+++ b/tools/ioemu/vl.c	Wed Jan 23 15:55:38 2008 +0000
@@ -7756,8 +7756,7 @@ int main(int argc, char **argv)
 	int vnc_display_port;
 	char password[20];
 	vnc_display_init(ds);
-	if (xenstore_read_vncpasswd(domid, password, sizeof(password)) < 0)
-	    exit(0);
+	xenstore_read_vncpasswd(domid, password, sizeof(password));
 	vnc_display_password(ds, password);
 	if ((vnc_display_port = vnc_display_open(ds, vnc_display, vncunused)) < 0) 
 	    exit (0);

in order to just ignore a missing passwd.
What do people think about that?

Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>