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save: support --xml to virsh save/restore

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Also, migrate was missing documentation for the --xml option
added in commit ec5301cb.

* tools/virsh.c (cmdSave, cmdRestore): Add xml argument.
* tools/virsh.pod (save, restore, migrate): Document it.
This commit is contained in:
Eric Blake 2011-07-19 14:24:29 -06:00
parent a779d2ff2d
commit 38149ec145
2 changed files with 52 additions and 6 deletions
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34
tools/virsh.c
View File

@ -1606,6 +1606,8 @@ static const vshCmdOptDef opts_save[] = {
{"bypass-cache", VSH_OT_BOOL, 0, N_("avoid file system cache when saving")},
{"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")},
{"file", VSH_OT_DATA, VSH_OFLAG_REQ, N_("where to save the data")},
{"xml", VSH_OT_STRING, 0,
N_("filename containing updated XML for the target")},
{NULL, 0, 0, NULL}
};
@ -1617,6 +1619,8 @@ cmdSave(vshControl *ctl, const vshCmd *cmd)
const char *to = NULL;
bool ret = false;
int flags = 0;
const char *xmlfile = NULL;
char *xml = NULL;
if (!vshConnectionUsability(ctl, ctl->conn))
return false;
@ -1627,10 +1631,20 @@ cmdSave(vshControl *ctl, const vshCmd *cmd)
if (vshCommandOptBool(cmd, "bypass-cache"))
flags |= VIR_DOMAIN_SAVE_BYPASS_CACHE;
if (vshCommandOptString(cmd, "xml", &xmlfile) < 0) {
vshError(ctl, "%s", _("malformed xml argument"));
return false;
}
if (!(dom = vshCommandOptDomain(ctl, cmd, &name)))
return false;
if ((flags ? virDomainSaveFlags(dom, to, NULL, flags)
if (xmlfile &&
virFileReadAll(xmlfile, 8192, &xml) < 0)
goto cleanup;
if (((flags || xml)
? virDomainSaveFlags(dom, to, xml, flags)
: virDomainSave(dom, to)) < 0) {
vshError(ctl, _("Failed to save domain %s to %s"), name, to);
goto cleanup;
@ -1640,6 +1654,7 @@ cmdSave(vshControl *ctl, const vshCmd *cmd)
ret = true;
cleanup:
VIR_FREE(xml);
virDomainFree(dom);
return ret;
}
@ -2016,6 +2031,8 @@ static const vshCmdOptDef opts_restore[] = {
{"file", VSH_OT_DATA, VSH_OFLAG_REQ, N_("the state to restore")},
{"bypass-cache", VSH_OT_BOOL, 0,
N_("avoid file system cache when restoring")},
{"xml", VSH_OT_STRING, 0,
N_("filename containing updated XML for the target")},
{NULL, 0, 0, NULL}
};
@ -2025,6 +2042,8 @@ cmdRestore(vshControl *ctl, const vshCmd *cmd)
const char *from = NULL;
bool ret = false;
int flags = 0;
const char *xmlfile = NULL;
char *xml = NULL;
if (!vshConnectionUsability(ctl, ctl->conn))
return false;
@ -2035,7 +2054,17 @@ cmdRestore(vshControl *ctl, const vshCmd *cmd)
if (vshCommandOptBool(cmd, "bypass-cache"))
flags |= VIR_DOMAIN_SAVE_BYPASS_CACHE;
if ((flags ? virDomainRestoreFlags(ctl->conn, from, NULL, flags)
if (vshCommandOptString(cmd, "xml", &xmlfile) < 0) {
vshError(ctl, "%s", _("malformed xml argument"));
return false;
}
if (xmlfile &&
virFileReadAll(xmlfile, 8192, &xml) < 0)
goto cleanup;
if (((flags || xml)
? virDomainRestoreFlags(ctl->conn, from, xml, flags)
: virDomainRestore(ctl->conn, from)) < 0) {
vshError(ctl, _("Failed to restore domain from %s"), from);
goto cleanup;
@ -2045,6 +2074,7 @@ cmdRestore(vshControl *ctl, const vshCmd *cmd)
ret = true;
cleanup:
VIR_FREE(xml);
return ret;
}

24
tools/virsh.pod
View File

@ -544,7 +544,7 @@ type attribute for the <domain> element of XML.
=item B<migrate> [I<--live>] [I<--direct>] [I<--p2p> [I<--tunnelled>]]
[I<--persistent>] [I<--undefinesource>] [I<--suspend>] [I<--copy-storage-all>]
[I<--copy-storage-inc>] [I<--verbose>] I<domain-id> I<desturi> [I<migrateuri>]
[I<dname>] [I<--timeout> B<seconds>]
[I<dname>] [I<--timeout> B<seconds>] [I<--xml> B<file>]
Migrate domain to another host. Add I<--live> for live migration; I<--p2p>
for peer-2-peer migration; I<--direct> for direct migration; or I<--tunnelled>
@ -559,7 +559,11 @@ I<--verbose> displays the progress of migration.
The I<desturi> is the connection URI of the destination host, and
I<migrateuri> is the migration URI, which usually can be omitted.
I<dname> is used for renaming the domain to new name during migration, which
also usually can be omitted.
also usually can be omitted. Likewise, I<--xml> B<file> is usually
omitted, but can be used to supply an alternative XML file for use on
the destination to supply a larger set of changes to any host-specific
portions of the domain XML, such as accounting for naming differences
between source and destination in accessing underlying storage.
I<--timeout> B<seconds> forces guest to suspend when live migration exceeds
that many seconds, and
@ -599,19 +603,25 @@ domain actually reboots.
The exact behavior of a domain when it reboots is set by the
I<on_reboot> parameter in the domain's XML definition.
=item B<restore> I<state-file> [I<--bypass-cache>]
=item B<restore> I<state-file> [I<--bypass-cache>] [I<--xml> B<file>]
Restores a domain from a B<virsh save> state file. See I<save> for more info.
If I<--bypass-cache> is specified, the restore will avoid the file system
cache, although this may slow down the operation.
I<--xml> B<file> is usually omitted, but can be used to supply an
alternative XML file for use on the restored guest with changes only
in the host-specific portions of the domain XML. For example, it can
be used to account for file naming differences in underlying storage
due to disk snapshots taken after the guest was saved.
B<Note>: To avoid corrupting file system contents within the domain, you
should not reuse the saved state file for a second B<restore> unless you
have also reverted all storage volumes back to the same contents as when
the state file was created.
=item B<save> I<domain-id> I<state-file> [I<--bypass-cache>]
=item B<save> I<domain-id> I<state-file> [I<--bypass-cache>] [I<--xml> B<file>]
Saves a running domain (RAM, but not disk state) to a state file so that
it can be restored
@ -625,6 +635,12 @@ This is roughly equivalent to doing a hibernate on a running computer,
with all the same limitations. Open network connections may be
severed upon restore, as TCP timeouts may have expired.
I<--xml> B<file> is usually omitted, but can be used to supply an
alternative XML file for use on the restored guest with changes only
in the host-specific portions of the domain XML. For example, it can
be used to account for file naming differences that are planned to
be made via disk snapshots of underlying storage after the guest is saved.
Domain saved state files assume that disk images will be unchanged
between the creation and restore point. For a more complete system
restore point, where the disk state is saved alongside the memory