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virsh: Add VSH_OFLAG_EMPTY_OK for attach-disk command

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As the description of removing CDROM media from
  http://wiki.libvirt.org/page/QEMUSwitchToLibvirt#eject_DEV

Add flag 'VSH_OFLAG_EMPTY_OK' to the option 'source' of attach-disk

Then avoid outputting <source> in the XML if 'source' was empty,
rather than trusting libvirt domain_conf.c to understand an empty
string.

Signed-off-by: Xu He Jie <xuhj@linux.vnet.ibm.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Xu He Jie 2011-11-08 15:16:34 +08:00 committed by Eric Blake
parent ab4823a062
commit 2d764cb472
1 changed files with 10 additions and 4 deletions
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14
tools/virsh.c
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@ -11569,7 +11569,8 @@ static const vshCmdInfo info_attach_disk[] = {
static const vshCmdOptDef opts_attach_disk[] = {
{"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")},
{"source", VSH_OT_DATA, VSH_OFLAG_REQ, N_("source of disk device")},
{"source", VSH_OT_DATA, VSH_OFLAG_REQ | VSH_OFLAG_EMPTY_OK,
N_("source of disk device")},
{"target", VSH_OT_DATA, VSH_OFLAG_REQ, N_("target of disk device")},
{"driver", VSH_OT_STRING, 0, N_("driver of disk device")},
{"subdriver", VSH_OT_STRING, 0, N_("subdriver of disk device")},
@ -11754,6 +11755,10 @@ cmdAttachDisk(vshControl *ctl, const vshCmd *cmd)
if (vshCommandOptString(cmd, "source", &source) <= 0)
goto cleanup;
/* Allow empty string as a placeholder that implies no source, for
* use in adding a cdrom drive with no disk. */
if (!*source)
source = NULL;
if (vshCommandOptString(cmd, "target", &target) <= 0)
goto cleanup;
@ -11808,9 +11813,10 @@ cmdAttachDisk(vshControl *ctl, const vshCmd *cmd)
if (driver || subdriver || cache)
virBufferAddLit(&buf, "/>\n");
virBufferAsprintf(&buf, " <source %s='%s'/>\n",
(isFile) ? "file" : "dev",
source);
if (source)
virBufferAsprintf(&buf, " <source %s='%s'/>\n",
(isFile) ? "file" : "dev",
source);
virBufferAsprintf(&buf, " <target dev='%s'/>\n", target);
if (mode)
virBufferAsprintf(&buf, " <%s/>\n", mode);