With this patch, it is hopefully a bit more obvious that for
snapshot-create-as, a literal '--diskspec' is mandatory if name
or description was omitted, but optional if all earlier options
were provided.
These all denote two diskspecs and a description:
virsh snapshot-create-as dom name desc vda vdb
virsh snapshot-create-as dom name desc --diskspec vda --diskspec vdb
virsh snapshot-create-as dom name desc --diskspec vda vdb
virsh snapshot-create-as dom name desc vda --diskspec vdb
virsh snapshot-create-as dom name desc --diskspec vda --diskspec vdb
This gives two diskspecs but no description:
virsh snapshot-create-as dom name --diskspec vda --diskspec vdb
And this treats 'vda' as the description, with only one diskspec:
virsh snapshot-create-as dom name vda vdb
The help output now shows:
snapshot-create-as <domain> [<name>] [<description>] [--print-xml] [--no-metadata] [--halt] [--disk-only] [[--diskspec] <string>]...
I also checked the help output for echo and send-key, which are two
other variants of argv commands.
* tools/virsh.pod (snapshot-create-as): Document when a literal
--diskspec must preceed a diskspec argument.
* tools/virsh.c (vshCmddefHelp): Update help output for argv when
naming the option is useful.
(vshCmddefGetData): Fix logic on when argv was seen.
Reported by Nan Zhang.
---
I think this is more comprehensive than Nan's patch, for nicer results.
tools/virsh.c | 27 +++++++++++++++++++++------
tools/virsh.pod | 6 ++++--
2 files changed, 25 insertions(+), 8 deletions(-)
diff --git a/tools/virsh.c b/tools/virsh.c
index 3c6e65a..fdb503a 100644
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -13856,9 +13856,10 @@ vshCmddefGetData(const vshCmdDef *cmd, uint32_t *opts_need_arg,
/* Grab least-significant set bit */
i = ffs(*opts_need_arg) - 1;
opt = &cmd->opts[i];
- if (opt->type != VSH_OT_ARGV)
+ if (opt->type != VSH_OT_ARGV) {
*opts_need_arg &= ~(1 << i);
- *opts_seen |= 1 << i;
+ *opts_seen |= 1 << i;
+ }
return opt;
}
@@ -13956,6 +13957,7 @@ vshCmddefHelp(vshControl *ctl, const char *cmdname)
char buf[256];
uint32_t opts_need_arg;
uint32_t opts_required;
+ bool shortopt = false; /* true if 'arg' works instead of '--opt arg' */
if (vshCmddefOptParse(def, &opts_need_arg, &opts_required)) {
vshError(ctl, _("internal error: bad options in command: '%s'"),
@@ -13980,18 +13982,30 @@ vshCmddefHelp(vshControl *ctl, const char *cmdname)
/* xgettext:c-format */
fmt = ((opt->flags & VSH_OFLAG_REQ) ? "<%s>"
: _("[--%s <number>]"));
+ if (!(opt->flags & VSH_OFLAG_REQ_OPT))
+ shortopt = true;
break;
case VSH_OT_STRING:
/* xgettext:c-format */
fmt = _("[--%s <string>]");
+ if (!(opt->flags & VSH_OFLAG_REQ_OPT))
+ shortopt = true;
break;
case VSH_OT_DATA:
fmt = ((opt->flags & VSH_OFLAG_REQ) ? "<%s>" : "[<%s>]");
+ if (!(opt->flags & VSH_OFLAG_REQ_OPT))
+ shortopt = true;
break;
case VSH_OT_ARGV:
/* xgettext:c-format */
- fmt = (opt->flags & VSH_OFLAG_REQ) ? _("<%s>...")
- : _("[<%s>]...");
+ if (shortopt) {
+ fmt = (opt->flags & VSH_OFLAG_REQ)
+ ? _("{[--%s] <string>}...")
+ : _("[[--%s] <string>]...");
+ } else {
+ fmt = (opt->flags & VSH_OFLAG_REQ) ? _("<%s>...")
+ : _("[<%s>]...");
+ }
break;
default:
assert(0);
@@ -14030,8 +14044,9 @@ vshCmddefHelp(vshControl *ctl, const char *cmdname)
opt->name);
break;
case VSH_OT_ARGV:
- /* Not really an option. */
- snprintf(buf, sizeof(buf), _("<%s>"), opt->name);
+ snprintf(buf, sizeof(buf),
+ shortopt ? _("[--%s] <string>") : _("<%s>"),
+ opt->name);
break;
default:
assert(0);
diff --git a/tools/virsh.pod b/tools/virsh.pod
index e82567d..126ace6 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -1773,7 +1773,7 @@ by command such as B<destroy> or by internal guest action).
=item B<snapshot-create-as> I<domain> {[I<--print-xml>]
| [I<--no-metadata>] [I<--halt>]} [I<name>] [I<description>]
-[I<--disk-only> [I<diskspec>]...]
+[I<--disk-only> [[I<--diskspec>] B<diskspec>]...
Create a snapshot for domain I<domain> with the given <name> and
<description>; if either value is omitted, libvirt will choose a
@@ -1788,7 +1788,9 @@ this flag is in use, the command can also take additional I<diskspec>
arguments to add <disk> elements to the xml. Each <diskspec> is in the
form B<disk[,snapshot=type][,driver=type][,file=name]>. To include a
literal comma in B<disk> or in B<file=name>, escape it with a second
-comma. For example, a diskspec of "vda,snapshot=external,file=/path/to,,new"
+comma. A literal I<--diskspec> must preceed each B<diskspec> unless
+all three of I<domain>, I<name>, and I<description> are also present.
+For example, a diskspec of "vda,snapshot=external,file=/path/to,,new"
results in the following XML:
<disk name='vda' snapshot='external'>
<source file='/path/to,new'/>
--
1.7.4.4
--
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