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add XML parsing for qemu/kvm status files
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14
ChangeLog
14
ChangeLog
@ -1,3 +1,17 @@
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Sat Dec 20 13:53:14 CET 2008 Guido Günther <agx@sigxcpu.org>
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add XML parsing for qemu/kvm status files
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* src/domain_conf.c, src/domain_conf.h (virDomainSaveXML): new function
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* src/domain_conf.c (virDomainSaveConfig): split out XML writing into
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virDomainSaveXML
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* src/qemu_conf.c (qemudDomainStatusParseFile): new function to parse
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status XML
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(qemudDomainStatusFormat): new function to format status XML
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(qemudSaveDomainStatus): new function to write status XML, uses
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virDomainSaveXML
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* src/libvirt_sym.version.in: add virBufferEscapeString, virDomainSaveXML,
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virXPathNode symbols
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Fri Dec 19 10:41:00 UTC 2008 Richard W.M. Jones <rjones@redhat.com>
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* docs/formatdomain.html.in: Fix documentation typo
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@ -430,6 +430,7 @@ void virDomainObjFree(virDomainObjPtr dom)
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virDomainDefFree(dom->def);
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virDomainDefFree(dom->newDef);
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VIR_FREE(dom->monitorpath);
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VIR_FREE(dom->vcpupids);
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VIR_FREE(dom);
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@ -3243,11 +3244,11 @@ char *virDomainDefFormat(virConnectPtr conn,
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#ifndef PROXY
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int virDomainSaveConfig(virConnectPtr conn,
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int virDomainSaveXML(virConnectPtr conn,
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const char *configDir,
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virDomainDefPtr def)
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virDomainDefPtr def,
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const char *xml)
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{
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char *xml;
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char *configFile = NULL;
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int fd = -1, ret = -1;
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size_t towrite;
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@ -3256,11 +3257,6 @@ int virDomainSaveConfig(virConnectPtr conn,
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if ((configFile = virDomainConfigFile(conn, configDir, def->name)) == NULL)
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goto cleanup;
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if (!(xml = virDomainDefFormat(conn,
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def,
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VIR_DOMAIN_XML_SECURE)))
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goto cleanup;
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if ((err = virFileMakePath(configDir))) {
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virDomainReportError(conn, VIR_ERR_INTERNAL_ERROR,
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_("cannot create config directory %s: %s"),
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@ -3293,12 +3289,30 @@ int virDomainSaveConfig(virConnectPtr conn,
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}
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ret = 0;
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cleanup:
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VIR_FREE(xml);
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if (fd != -1)
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close(fd);
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return ret;
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}
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int virDomainSaveConfig(virConnectPtr conn,
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const char *configDir,
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virDomainDefPtr def)
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{
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int ret = -1;
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char *xml;
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if (!(xml = virDomainDefFormat(conn,
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def,
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VIR_DOMAIN_XML_SECURE)))
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goto cleanup;
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if (virDomainSaveXML(conn, configDir, def, xml))
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goto cleanup;
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ret = 0;
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cleanup:
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VIR_FREE(xml);
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return ret;
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}
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@ -464,6 +464,7 @@ struct _virDomainObj {
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int stderr_fd;
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int stderr_watch;
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int monitor;
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char *monitorpath;
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int monitorWatch;
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int logfile;
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int pid;
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@ -555,6 +556,11 @@ int virDomainDiskQSort(const void *a, const void *b);
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int virDomainDiskCompare(virDomainDiskDefPtr a,
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virDomainDiskDefPtr b);
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int virDomainSaveXML(virConnectPtr conn,
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const char *configDir,
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virDomainDefPtr def,
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const char *xml);
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int virDomainSaveConfig(virConnectPtr conn,
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const char *configDir,
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virDomainDefPtr def);
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@ -281,6 +281,7 @@ LIBVIRT_PRIVATE_@VERSION@ {
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# buf.h
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virBufferVSprintf;
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virBufferEscapeString;
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virBufferAdd;
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virBufferAddChar;
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virBufferContentAndReset;
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@ -360,6 +361,7 @@ LIBVIRT_PRIVATE_@VERSION@ {
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virDomainObjFree;
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virDomainObjListFree;
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virDomainRemoveInactive;
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virDomainSaveXML;
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virDomainSaveConfig;
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virDomainSoundDefFree;
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virDomainSoundModelTypeFromString;
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@ -601,6 +603,7 @@ LIBVIRT_PRIVATE_@VERSION@ {
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# xml.h
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virXPathLong;
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virXPathNode;
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virXPathNodeSet;
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virXPathString;
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virXMLPropString;
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191
src/qemu_conf.c
191
src/qemu_conf.c
@ -49,6 +49,8 @@
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#include "util.h"
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#include "memory.h"
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#include "verify.h"
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#include "datatypes.h"
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#include "xml.h"
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VIR_ENUM_DECL(virDomainDiskQEMUBus)
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VIR_ENUM_IMPL(virDomainDiskQEMUBus, VIR_DOMAIN_DISK_BUS_LAST,
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@ -1334,3 +1336,192 @@ int qemudBuildCommandLine(virConnectPtr conn,
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#undef ADD_ENV_LIT
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#undef ADD_ENV_SPACE
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}
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/* Called from SAX on parsing errors in the XML. */
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static void
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catchXMLError (void *ctx, const char *msg ATTRIBUTE_UNUSED, ...)
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{
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xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
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if (ctxt) {
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virConnectPtr conn = ctxt->_private;
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if (ctxt->lastError.level == XML_ERR_FATAL &&
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ctxt->lastError.message != NULL) {
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qemudReportError (conn, NULL, NULL, VIR_ERR_XML_DETAIL,
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_("at line %d: %s"),
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ctxt->lastError.line,
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ctxt->lastError.message);
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}
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}
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}
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/**
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* qemudDomainStatusParseFile
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*
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* read the last known status of a domain
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*
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* Returns 0 on success
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*/
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qemudDomainStatusPtr
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qemudDomainStatusParseFile(virConnectPtr conn,
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virCapsPtr caps,
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const char *filename, int flags)
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{
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xmlParserCtxtPtr pctxt = NULL;
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xmlXPathContextPtr ctxt = NULL;
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xmlDocPtr xml = NULL;
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xmlNodePtr root, config_root;
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virDomainDefPtr def = NULL;
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char *tmp = NULL;
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long val;
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qemudDomainStatusPtr status = NULL;
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if (VIR_ALLOC(status) < 0) {
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qemudReportError(conn, NULL, NULL, VIR_ERR_NO_MEMORY,
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"%s", _("failed to allocate space for vm status"));
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goto error;
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}
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/* Set up a parser context so we can catch the details of XML errors. */
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pctxt = xmlNewParserCtxt ();
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if (!pctxt || !pctxt->sax)
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goto error;
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pctxt->sax->error = catchXMLError;
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pctxt->_private = conn;
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if (conn) virResetError (&conn->err);
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xml = xmlCtxtReadFile (pctxt, filename, NULL,
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XML_PARSE_NOENT | XML_PARSE_NONET |
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XML_PARSE_NOWARNING);
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if (!xml) {
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if (conn && conn->err.code == VIR_ERR_NONE)
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qemudReportError(conn, NULL, NULL, VIR_ERR_XML_ERROR,
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"%s", _("failed to parse xml document"));
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goto error;
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}
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if ((root = xmlDocGetRootElement(xml)) == NULL) {
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qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
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"%s", _("missing root element"));
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goto error;
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}
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ctxt = xmlXPathNewContext(xml);
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if (ctxt == NULL) {
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qemudReportError(conn, NULL, NULL, VIR_ERR_NO_MEMORY, NULL);
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goto error;
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}
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if (!xmlStrEqual(root->name, BAD_CAST "domstatus")) {
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qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
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"%s", _("incorrect root element"));
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goto error;
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}
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ctxt->node = root;
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if((virXPathLong(conn, "string(./@state)", ctxt, &val)) < 0) {
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qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
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"%s", _("invalid domain state"));
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goto error;
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} else
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status->state = (int)val;
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if((virXPathLong(conn, "string(./@pid)", ctxt, &val)) < 0) {
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qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
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"%s", _("invalid pid"));
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goto error;
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} else
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status->pid = (pid_t)val;
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if(!(tmp = virXPathString(conn, "string(./monitor[1]/@path)", ctxt))) {
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qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
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"%s", _("no monitor path"));
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goto error;
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} else
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status->monitorpath = tmp;
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if(!(config_root = virXPathNode(conn, "./domain", ctxt))) {
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qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
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"%s", _("no domain config"));
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goto error;
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}
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if(!(def = virDomainDefParseNode(conn, caps, xml, config_root, flags)))
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goto error;
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else
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status->def = def;
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cleanup:
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xmlFreeParserCtxt (pctxt);
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xmlXPathFreeContext(ctxt);
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xmlFreeDoc (xml);
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return status;
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error:
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VIR_FREE(tmp);
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VIR_FREE(status);
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goto cleanup;
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}
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/**
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* qemudDomainStatusFormat
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*
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* Get the state of a running domain as XML
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*
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* Returns xml on success
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*/
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static char*
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qemudDomainStatusFormat(virConnectPtr conn,
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virDomainObjPtr vm)
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{
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char *config_xml = NULL, *xml = NULL;
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virBuffer buf = VIR_BUFFER_INITIALIZER;
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virBufferVSprintf(&buf, "<domstatus state='%d' pid='%d'>\n", vm->state, vm->pid);
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virBufferEscapeString(&buf, " <monitor path='%s'/>\n", vm->monitorpath);
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if (!(config_xml = virDomainDefFormat(conn,
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vm->def,
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VIR_DOMAIN_XML_SECURE)))
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goto cleanup;
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virBufferAdd(&buf, config_xml, strlen(config_xml));
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virBufferAddLit(&buf, "</domstatus>\n");
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xml = virBufferContentAndReset(&buf);
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cleanup:
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VIR_FREE(config_xml);
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return xml;
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}
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/**
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* qemudSaveDomainStatus
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*
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* Save the current status of a running domain
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*
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* Returns 0 on success
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*/
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int
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qemudSaveDomainStatus(virConnectPtr conn,
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struct qemud_driver *driver,
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virDomainObjPtr vm)
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{
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int ret = -1;
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char *xml = NULL;
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if (!(xml = qemudDomainStatusFormat(conn, vm)))
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goto cleanup;
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if ((ret = virDomainSaveXML(conn, driver->stateDir, vm->def, xml)))
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goto cleanup;
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ret = 0;
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cleanup:
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VIR_FREE(xml);
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return ret;
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}
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@ -77,6 +77,16 @@ struct qemud_driver {
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int domainEventDispatching;
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};
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/* Status needed to reconenct to running VMs */
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typedef struct _qemudDomainStatus qemudDomainStatus;
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typedef qemudDomainStatus *qemudDomainStatusPtr;
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struct _qemudDomainStatus {
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char *monitorpath;
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pid_t pid;
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int state;
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virDomainDefPtr def;
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};
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/* Port numbers used for KVM migration. */
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#define QEMUD_MIGRATION_FIRST_PORT 49152
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#define QEMUD_MIGRATION_NUM_PORTS 64
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@ -108,5 +118,12 @@ int qemudBuildCommandLine (virConnectPtr conn,
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const char *migrateFrom);
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const char *qemudVirtTypeToString (int type);
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qemudDomainStatusPtr qemudDomainStatusParseFile(virConnectPtr conn,
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virCapsPtr caps,
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const char *filename,
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int flags);
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int qemudSaveDomainStatus(virConnectPtr conn,
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struct qemud_driver *driver,
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virDomainObjPtr vm);
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#endif /* __QEMUD_CONF_H */
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