Teach fastboot to allow required variables per product.

This is needed for products like xoom-cdma and xoom-cdma-lte.
The xoom-cdma-lte product requires an lte baseband binary but
it's not needed for xoom-cdma.

This is implemented by allowing an optional product parameter
to "required" statements. The parameter is separated from
"required" by a colon so the version-baseband-2 requirment in
board-info.txt for stingray becomes:

 require-for-product:xoom-cdma-lte version-baseband-2=ltedc_u_03.25.00|ltedc_u_03.19.00

In the above statement, only xoom-cdma-lte requires version-baseband-2
and the baseband can be lte_u_03.25.00 or lte_u_03.19.00. For other
products version-baseband-2 will be ignored.


Change-Id: I786bec5f5661c2243d87925b064fc6124d3cffa1

fastboot/engine.c

@@ -69,6 +69,7 @@ struct Action
     Action *next;
 
     char cmd[64];    
+    const char *prod;
     void *data;
     unsigned size;
 
@@ -183,6 +184,16 @@ static int cb_check(Action *a, int status, char *resp, int invert)
         return status;
     }
 
+    if (a->prod) {
+        if (strcmp(a->prod, cur_product) != 0) {
+            double split = now();
+            fprintf(stderr,"IGNORE, product is %s required only for %s [%7.3fs]\n",
+                    cur_product, a->prod, (split - a->start));
+            a->start = split;
+            return 0;
+        }
+    }
+
     yes = match(resp, value, count);
     if (invert) yes = !yes;
 
@@ -214,10 +225,12 @@ static int cb_reject(Action *a, int status, char *resp)
     return cb_check(a, status, resp, 1);
 }
 
-void fb_queue_require(const char *var, int invert, unsigned nvalues, const char **value)
+void fb_queue_require(const char *prod, const char *var,
+		int invert, unsigned nvalues, const char **value)
 {
     Action *a;
     a = queue_action(OP_QUERY, "getvar:%s", var);
+    a->prod = prod;
     a->data = value;
     a->size = nvalues;
     a->msg = mkmsg("checking %s", var);
@@ -244,6 +257,25 @@ void fb_queue_display(const char *var, const char *prettyname)
     a->func = cb_display;
 }
 
+static int cb_save(Action *a, int status, char *resp)
+{
+    if (status) {
+        fprintf(stderr, "%s FAILED (%s)\n", a->cmd, resp);
+        return status;
+    }
+    strncpy(a->data, resp, a->size);
+    return 0;
+}
+
+void fb_queue_query_save(const char *var, char *dest, unsigned dest_size)
+{
+    Action *a;
+    a = queue_action(OP_QUERY, "getvar:%s", var);
+    a->data = (void *)dest;
+    a->size = dest_size;
+    a->func = cb_save;
+}
+
 static int cb_do_nothing(Action *a, int status, char *resp)
 {
     fprintf(stderr,"\n");

fastboot/fastboot.c

@@ -42,6 +42,8 @@
 
 #include "fastboot.h"
 
+char cur_product[FB_RESPONSE_SZ + 1];
+
 void bootimg_set_cmdline(boot_img_hdr *h, const char *cmdline);
 
 boot_img_hdr *mkbootimg(void *kernel, unsigned kernel_size,
@@ -340,6 +342,7 @@ static int setup_requirement_line(char *name)
 {
     char *val[MAX_OPTIONS];
     const char **out;
+    char *prod = NULL;
     unsigned n, count;
     char *x;
     int invert = 0;
@@ -350,6 +353,14 @@ static int setup_requirement_line(char *name)
     } else if (!strncmp(name, "require ", 8)) {
         name += 8;
         invert = 0;
+    } else if (!strncmp(name, "require-for-product:", 20)) {
+        // Get the product and point name past it
+        prod = name + 20;
+        name = strchr(name, ' ');
+        if (!name) return -1;
+        *name = 0;
+        name += 1;
+        invert = 0;
     }
 
     x = strchr(name, '=');
@@ -381,7 +392,7 @@ static int setup_requirement_line(char *name)
         if (out[n] == 0) return -1;
     }
 
-    fb_queue_require(name, invert, n, out);
+    fb_queue_require(prod, name, invert, n, out);
     return 0;
 }
 
@@ -432,6 +443,8 @@ void do_update(char *fn)
 
     queue_info_dump();
 
+    fb_queue_query_save("product", cur_product, sizeof(cur_product));
+
     zdata = load_file(fn, &zsize);
     if (zdata == 0) die("failed to load '%s'", fn);
 
@@ -498,6 +511,8 @@ void do_flashall(void)
 
     queue_info_dump();
 
+    fb_queue_query_save("product", cur_product, sizeof(cur_product));
+
     fname = find_item("info", product);
     if (fname == 0) die("cannot find android-info.txt");
     data = load_file(fname, &sz);

fastboot/fastboot.h

@@ -43,8 +43,10 @@ char *fb_get_error(void);
 /* engine.c - high level command queue engine */
 void fb_queue_flash(const char *ptn, void *data, unsigned sz);;
 void fb_queue_erase(const char *ptn);
-void fb_queue_require(const char *var, int invert, unsigned nvalues, const char **value);
+void fb_queue_require(const char *prod, const char *var, int invert,
+        unsigned nvalues, const char **value);
 void fb_queue_display(const char *var, const char *prettyname);
+void fb_queue_query_save(const char *var, char *dest, unsigned dest_size);
 void fb_queue_reboot(void);
 void fb_queue_command(const char *cmd, const char *msg);
 void fb_queue_download(const char *name, void *data, unsigned size);
@@ -54,4 +56,7 @@ int fb_execute_queue(usb_handle *usb);
 /* util stuff */
 void die(const char *fmt, ...);
 
+/* Current product */
+extern char cur_product[FB_RESPONSE_SZ + 1];
+
 #endif