[PATCH 14/14] xl: xl block-attach -N (dry run) option

[Ian Jackson <ian.jackson@eu.citrix.com>]

This is mainly for debugging purposes at the moment.  Eventually I
hope all commands will gain this so that -N will be a global option.

In the meantime this new option is not documented and should be
regarded as unstable.

Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
---
 tools/libxl/xl_cmdimpl.c |   34 +++++++++++++++++++++++++++++++---
 1 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index ccffd26..a8b3f9f 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -3930,13 +3930,25 @@ int main_networkdetach(int argc, char **argv)
 
 int main_blockattach(int argc, char **argv)
 {
-    int opt;
+    int opt, dry_run = 0;
     uint32_t fe_domid, be_domid = 0;
     libxl_device_disk disk = { 0 };
     XLU_Config *config = 0;
 
-    if ((opt = def_getopt(argc, argv, "", "block-attach", 2)) != -1)
-        return opt;
+    while ((opt = getopt(argc, argv, "Nh")) != -1) {
+        switch (opt) {
+        case 'N':
+            /* fixme this should become a global option eventually */
+            dry_run = 1;
+            break;
+        case 'h':
+            help("block-attach");
+            return 0;
+        default:
+            fprintf(stderr, "option `%c' not supported.\n", optopt);
+            break;
+        }
+    }
     if ((argc-optind < 2)) {
         help("block-attach");
         return 2;
@@ -3953,6 +3965,22 @@ int main_blockattach(int argc, char **argv)
 
     disk.backend_domid = be_domid;
 
+    if (dry_run) {
+        /* fixme: this should be generated from the idl */
+        /* fixme: enums (backend, format) should be converted to strings */
+        printf("disk.backend_domid = %"PRIx32"\n", disk.backend_domid);
+        printf("disk.pdev_path =     %s\n",        disk.pdev_path);
+        printf("disk.vdev =          %s\n",        disk.vdev);
+        printf("disk.backend =       %d\n",        disk.backend);
+        printf("disk.format =        %d\n",        disk.format);
+        printf("disk.script =        %s\n",        disk.script);
+        printf("disk.removable =     %d\n",        disk.removable);
+        printf("disk.readwrite =     %d\n",        disk.readwrite);
+        printf("disk.is_cdrom =      %d\n",        disk.is_cdrom);
+        if (ferror(stdout) || fflush(stdout)) { perror("stdout"); exit(-1); }
+        return 0;
+    }
+
     if (libxl_device_disk_add(ctx, fe_domid, &disk)) {
         fprintf(stderr, "libxl_device_disk_add failed.\n");
     }
-- 
1.7.2.5