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[libvirt] [PATCHv2] virsh: tweak help output for VSH_OT_DATA

https://bugzilla.redhat.com/show_bug.cgi?id=609044 complained
that 'virsh help pool-create-as' didn't document the shortcut
that you can do 'virsh pool-create-as $name $type --target $target'
rather than having to supply the four optional source- arguments
in order to fill out the necessary positional arguments.

This one-liner changes the help output to hopefully make this more obvious:

    pool-create-as - create a pool from a set of args

    pool-create-as <name> [--print-xml] <type> [<source-host>] [<source-path>] [<source-dev>] [<source-name>] [<target>] [--source-format <string>]

    Create a pool.

    [--name] <string>  name of the pool
    --print-xml      print XML document, but don't define/create
    [--type] <string>  type of the pool
    [--source-host] <string>  source-host for underlying storage
    [--source-path] <string>  source path for underlying storage
    [--source-dev] <string>  source device for underlying storage
    [--source-name] <string>  source name for underlying storage
    [--target] <string>  target for underlying storage
    --source-format <string>  format for underlying storage

* tools/virsh.c (vshCmddefHelp): Make it more obvious that data
arguments may, but not must, be specified by option leaders.

Changed in v2: translate the help string, now that it contains an
English word and not just a %s.

 tools/virsh.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/tools/virsh.c b/tools/virsh.c
index f1bb295..788f274 100644
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -9558,7 +9558,8 @@ vshCmddefHelp(vshControl *ctl, const char *cmdname)
                 else if (opt->type == VSH_OT_STRING)
                     snprintf(buf, sizeof(buf), _("--%s <string>"), opt->name);
                 else if (opt->type == VSH_OT_DATA)
-                    snprintf(buf, sizeof(buf), "<%s>", opt->name);
+                    snprintf(buf, sizeof(buf), _("[--%s] <string>"),
+                             opt->name);

                 fprintf(stdout, "    %-15s  %s\n", buf, _(opt->help));

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