[Qemu-devel] [6910] qemu-img: adding a "-F base_fmt" option to "qemu-img create -b" ( Uri Lublin)

[Anthony Liguori <anthony@codemonkey.ws>]

Revision: 6910
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=6910
Author:   aliguori
Date:     2009-03-28 17:55:19 +0000 (Sat, 28 Mar 2009)
Log Message:
-----------
qemu-img: adding a "-F base_fmt" option to "qemu-img create -b" (Uri Lublin)

If the user specifies the backing file format,
then when opening the backing file, there is no need
to probe the (backing file) image to figure out its format.

This follows my previous patches implementing bdrv_create2
which keeps (for qcow2 only) the backing file format
as a qcow2-extension

Suggested by Daniel P. Berrange.

Signed-off-by: Uri Lublin <uril@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

Modified Paths:
--------------
    trunk/qemu-img.c
    trunk/qemu-img.texi

Modified: trunk/qemu-img.c
===================================================================
--- trunk/qemu-img.c	2009-03-28 17:55:14 UTC (rev 6909)
+++ trunk/qemu-img.c	2009-03-28 17:55:19 UTC (rev 6910)
@@ -25,6 +25,7 @@
 #include "osdep.h"
 #include "block_int.h"
 #include <assert.h>
+#include <stdio.h>
 
 #ifdef _WIN32
 #include <windows.h>
@@ -57,7 +58,7 @@
            "QEMU disk image utility\n"
            "\n"
            "Command syntax:\n"
-           "  create [-e] [-6] [-b base_image] [-f fmt] filename [size]\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"
            "  info [-f fmt] filename\n"
@@ -217,6 +218,7 @@
 {
     int c, ret, flags;
     const char *fmt = "raw";
+    const char *base_fmt = NULL;
     const char *filename;
     const char *base_filename = NULL;
     uint64_t size;
@@ -226,13 +228,16 @@
 
     flags = 0;
     for(;;) {
-        c = getopt(argc, argv, "b:f:he6");
+        c = getopt(argc, argv, "F:b:f:he6");
         if (c == -1)
             break;
         switch(c) {
         case 'h':
             help();
             break;
+        case 'F':
+            base_fmt = optarg;
+            break;
         case 'b':
             base_filename = optarg;
             break;
@@ -253,7 +258,15 @@
     size = 0;
     if (base_filename) {
         BlockDriverState *bs;
-        bs = bdrv_new_open(base_filename, NULL);
+        BlockDriver *base_drv = NULL;
+
+        if (base_fmt) {
+            base_drv = bdrv_find_format(base_fmt);
+            if (base_drv == NULL)
+                error("Unknown basefile format '%s'", base_fmt);
+        }
+
+        bs = bdrv_new_open(base_filename, base_fmt);
         bdrv_get_geometry(bs, &size);
         size *= 512;
         bdrv_delete(bs);
@@ -284,9 +297,12 @@
     if (base_filename) {
         printf(", backing_file=%s",
                base_filename);
+         if (base_fmt)
+             printf(", backing_fmt=%s",
+                    base_fmt);
     }
     printf(", size=%" PRIu64 " kB\n", size / 1024);
-    ret = bdrv_create(drv, filename, size / 512, base_filename, flags);
+    ret = bdrv_create2(drv, filename, size / 512, base_filename, base_fmt, flags);
     if (ret < 0) {
         if (ret == -ENOTSUP) {
             error("Formatting or formatting option not supported for file format '%s'", fmt);

Modified: trunk/qemu-img.texi
===================================================================
--- trunk/qemu-img.texi	2009-03-28 17:55:14 UTC (rev 6909)
+++ trunk/qemu-img.texi	2009-03-28 17:55:19 UTC (rev 6910)
@@ -8,7 +8,7 @@
 
 The following commands are supported:
 @table @option
-@item create [-e] [-6] [-b @var{base_image}] [-f @var{fmt}] @var{filename} [@var{size}]
+@item create [-e] [-6] [-F @var{base_fmt}] [-b @var{base_image}] [-f @var{fmt}] @var{filename} [@var{size}]
 @item commit [-f @var{fmt}] @var{filename}
 @item convert [-c] [-e] [-6] [-f @var{fmt}] [-O @var{output_fmt}] [-B @var{output_base_image}] @var{filename} [@var{filename2} [...]] @var{output_filename}
 @item info [-f @var{fmt}] @var{filename}
@@ -27,6 +27,8 @@
 image of the specified base image; @code{output_base_image} should have the same
 content as the input's base image, however the path, image format, etc may
 differ
+@item base_fmt
+is the disk image format of @var{base_image}. for more information look at @var{fmt}
 @item fmt
 is the disk image format. It is guessed automatically in most cases. The following formats are supported: