Introduce qemu-img check subcommand (Kevin Wolf)

From: Kevin Wolf <kwolf@redhat.com>

Now that block drivers can provide check functions, expose them through
qemu-img.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7215 c046a42c-6fe2-441c-8c8c-71466251a162

qemu-img.c

@@ -58,6 +58,7 @@ static void help(void)
            "QEMU disk image utility\n"
            "\n"
            "Command syntax:\n"
+           "  check [-f fmt] filename\n"
            "  create [-e] [-6] [-F fmt] [-b base_image] [-f fmt] filename [size]\n"
            "  commit [-f fmt] filename\n"
            "  convert [-c] [-e] [-6] [-f fmt] [-O output_fmt] [-B output_base_image] filename [filename2 [...]] output_filename\n"
@@ -315,6 +316,65 @@ static int img_create(int argc, char **argv)
     return 0;
 }
 
+static int img_check(int argc, char **argv)
+{
+    int c, ret;
+    const char *filename, *fmt;
+    BlockDriver *drv;
+    BlockDriverState *bs;
+
+    fmt = NULL;
+    for(;;) {
+        c = getopt(argc, argv, "f:h");
+        if (c == -1)
+            break;
+        switch(c) {
+        case 'h':
+            help();
+            break;
+        case 'f':
+            fmt = optarg;
+            break;
+        }
+    }
+    if (optind >= argc)
+        help();
+    filename = argv[optind++];
+
+    bs = bdrv_new("");
+    if (!bs)
+        error("Not enough memory");
+    if (fmt) {
+        drv = bdrv_find_format(fmt);
+        if (!drv)
+            error("Unknown file format '%s'", fmt);
+    } else {
+        drv = NULL;
+    }
+    if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
+        error("Could not open '%s'", filename);
+    }
+    ret = bdrv_check(bs);
+    switch(ret) {
+    case 0:
+        printf("No errors were found on the image.\n");
+        break;
+    case -ENOTSUP:
+        error("This image format does not support checks");
+        break;
+    default:
+        if (ret < 0) {
+            error("An error occurred during the check");
+        } else {
+            printf("%d errors were found on the image.\n", ret);
+        }
+        break;
+    }
+
+    bdrv_delete(bs);
+    return 0;
+}
+
 static int img_commit(int argc, char **argv)
 {
     int c, ret;
@@ -888,6 +948,8 @@ int main(int argc, char **argv)
     argc--; argv++;
     if (!strcmp(cmd, "create")) {
         img_create(argc, argv);
+    } else if (!strcmp(cmd, "check")) {
+        img_check(argc, argv);
     } else if (!strcmp(cmd, "commit")) {
         img_commit(argc, argv);
     } else if (!strcmp(cmd, "convert")) {