xl: Pass -v options on to migration receiver

Compute a -v option to pass to the migration receiver.

Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
Acked-by: Ian Campbell <Ian.Campbell@citrix.com>

---
v2: Use minmsglevel_default to initialise minmsglevel.

tools/libxl/xl.c

@@ -50,7 +50,7 @@ enum output_format default_output_format = OUTPUT_FORMAT_JSON;
 int claim_mode = 1;
 bool progress_use_cr = 0;
 
-static xentoollog_level minmsglevel = XTL_PROGRESS;
+xentoollog_level minmsglevel = minmsglevel_default;
 
 /* Get autoballoon option based on presence of dom0_mem Xen command
    line option. */

tools/libxl/xl.h

@@ -153,6 +153,8 @@ extern int run_hotplug_scripts;
 extern int dryrun_only;
 extern int claim_mode;
 extern bool progress_use_cr;
+extern xentoollog_level minmsglevel;
+#define minmsglevel_default XTL_PROGRESS
 extern char *lockfile;
 extern char *default_vifscript;
 extern char *default_bridge;

tools/libxl/xl_cmdimpl.c

@@ -4115,9 +4115,21 @@ int main_migrate(int argc, char **argv)
     if (!ssh_command[0]) {
         rune= host;
     } else {
-        if (asprintf(&rune, "exec %s %s xl%s migrate-receive%s%s",
+        char verbose_buf[minmsglevel_default+3];
+        int verbose_len;
+        verbose_buf[0] = ' ';
+        verbose_buf[1] = '-';
+        memset(verbose_buf+2, 'v', minmsglevel_default);
+        verbose_buf[sizeof(verbose_buf)-1] = 0;
+        if (minmsglevel == minmsglevel_default) {
+            verbose_len = 0;
+        } else {
+            verbose_len = (minmsglevel_default - minmsglevel) + 2;
+        }
+        if (asprintf(&rune, "exec %s %s xl%s%.*s migrate-receive%s%s",
                      ssh_command, host,
                      pass_tty_arg ? " -t" : "",
+                     verbose_len, verbose_buf,
                      daemonize ? "" : " -e",
                      debug ? " -d" : "") < 0)
             return 1;