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/*
* virsh-edit.c: Implementation of generic virsh *-edit intelligence
*
* Copyright (C) 2012 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; If not, see
* <http://www.gnu.org/licenses/>.
*
* Usage:
* Define macros:
* EDIT_GET_XML - expression which produces a pointer to XML string, e.g:
* #define EDIT_GET_XML virDomainGetXMLDesc(dom, flags)
*
* EDIT_NOT_CHANGED - this action is taken if the XML wasn't changed.
* Note, that you don't want to jump to cleanup but edit_cleanup label
* where temporary variables are free()-d and temporary file is deleted:
* #define EDIT_NOT_CHANGED vshPrint(ctl, _("Domain %s XML not changed"), \
* virDomainGetName(dom)); \
* ret = true; goto edit_cleanup;
* Note that this is a statement.
*
* EDIT_DEFINE - expression which redefines the object. The edited XML from
* user is in 'doc_edited' variable. Don't overwrite the pointer to the
* object, as we may iterate once more over and therefore the pointer
* would be invalid. Hence assign object to a different variable.
* Moreover, this needs to be an expression where:
* - 0 is taken as error (our virDefine* APIs often return NULL on error)
* - everything else is taken as success
* For example:
* #define EDIT_DEFINE (dom_edited = virDomainDefineXML(ctl->conn, doc_edited))
*
* EDIT_FREE - statement which vir*Free()-s object defined by EDIT_DEFINE, e.g:
* #define EDIT_FREE if (dom_edited) virDomainFree(dom_edited);
*
* Michal Privoznik <mprivozn@redhat.com>
*/
#ifndef EDIT_GET_XML
# error Missing EDIT_GET_XML definition
#endif
#ifndef EDIT_NOT_CHANGED
# error Missing EDIT_NOT_CHANGED definition
#endif
#ifndef EDIT_DEFINE
# error Missing EDIT_DEFINE definition
#endif
#ifndef EDIT_FREE
# error Missing EDIT_FREE definition
#endif
do {
char *tmp = NULL;
char *doc = NULL;
char *doc_edited = NULL;
char *doc_reread = NULL;
const char *msg = NULL;
/* Get the XML configuration of the object. */
doc = (EDIT_GET_XML);
if (!doc)
goto edit_cleanup;
/* Create and open the temporary file. */
tmp = vshEditWriteToTempFile(ctl, doc);
if (!tmp)
goto edit_cleanup;
reedit:
/* Start the editor. */
if (vshEditFile(ctl, tmp) == -1)
goto edit_cleanup;
/* Read back the edited file. */
doc_edited = vshEditReadBackFile(ctl, tmp);
if (!doc_edited)
goto edit_cleanup;
/* Compare original XML with edited. Has it changed at all? */
if (STREQ(doc, doc_edited)) {
EDIT_NOT_CHANGED;
}
redefine:
msg = NULL;
/* Now re-read the object XML. Did someone else change it while
* it was being edited? This also catches problems such as us
* losing a connection or the object going away.
*/
doc_reread = (EDIT_GET_XML);
if (!doc_reread)
goto edit_cleanup;
if (STRNEQ(doc, doc_reread)) {
msg = _("The XML configuration was changed by another user.");
VIR_FREE(doc);
doc = doc_reread;
doc_reread = NULL;
}
/* Everything checks out, so redefine the object. */
EDIT_FREE;
if (!msg && !(EDIT_DEFINE)) {
msg = _("Failed.");
}
if (msg) {
int c = vshAskReedit(ctl, msg);
switch (c) {
case 'y':
goto reedit;
break;
case 'f':
goto redefine;
break;
case 'n':
goto edit_cleanup;
break;
default:
vshError(ctl, "%s", msg);
break;
}
}
break;
edit_cleanup:
VIR_FREE(doc);
VIR_FREE(doc_edited);
VIR_FREE(doc_reread);
if (tmp) {
unlink (tmp);
VIR_FREE(tmp);
}
goto cleanup;
} while (0);
#undef EDIT_GET_XML
#undef EDIT_NOT_CHANGED
#undef EDIT_DEFINE
#undef EDIT_FREE
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