Fixup c utilities and add start_root

The diskless will use start_root to boot the 'main' OS as a container.

confluent_osdeploy/utils/Makefile

@@ -1,6 +1,6 @@
 CC := gcc
 CFLAGS := -Os
-TARGETS := copernicus autocons
+TARGETS := copernicus autocons start_root
 
 all: $(TARGETS) clortho
 

confluent_osdeploy/utils/autocons.c

@@ -95,7 +95,7 @@ int main(int argc, char* argv[]) {
     timeout.tv_usec = 500000;
     FD_ZERO(&set);
     FD_SET(ttyf, &set);
-    write(ttyf, "\0337\033[999;999H\033[6n\0338", 18);
+    if (write(ttyf, "\0337\033[999;999H\033[6n\0338", 18) < 0) {};
     while (select(ttyf + 1, &set, NULL, NULL, &timeout) > 0) {
         if ((tmpi = read(ttyf, buff + bufflen, 127 - bufflen)) < 0) {
             if (errno == EAGAIN || errno == EWOULDBLOCK) {

confluent_osdeploy/utils/clortho.c

@@ -116,7 +116,7 @@ int main(int argc, char* argv[]) {
             currtype = buffer[0];
 	    if (currtype & 0b10000000) {
                 currlen = buffer[1] << 8;
-                read(sock, buffer, 1);
+                while (read(sock, buffer, 1) < 0) {}; 
                 currlen |= buffer[0];
             } else {
                 currlen = buffer[1];
@@ -131,7 +131,7 @@ int main(int argc, char* argv[]) {
                 buffer[currlen] = 0;
             }
             if (currtype == 2) {
-                dprintf(sock, "\x03%c", currlen);
+                dprintf(sock, "\x03%zu", currlen);
                 ret = write(sock, buffer, currlen);
                 slen = strlen(cryptedpass) & 0xff;
                 dprintf(sock, "\x04%c%s", slen, cryptedpass);