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domain: Require <init> for container guests

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Use capabilities to allow a driver to register a default <init> if none
is specified in the XML. Openvz was already open-coding this to be /sbin/init

LXC currently falls over if no init is specified, so an explicit error is
an improvement IMO.

(Side note: I don't think we can set a default value for LXC. If we use
/sbin/init but the user doesn't specify a separate root FS for their guest,
the container will rerun the host's init which can be traumatic :). For
virt-install I'm thinking of defaulting to /sbin/init if a root FS has
been specified, otherwise require the user to manually specify <init>)
This commit is contained in:
Cole Robinson 2011-05-12 16:12:05 -04:00
parent 0571c3afde
commit 34639a3f6b
4 changed files with 16 additions and 15 deletions
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1
src/conf/capabilities.h
View File

@ -150,6 +150,7 @@ struct _virCaps {
int (*privateDataXMLFormat)(virBufferPtr, void *);
int (*privateDataXMLParse)(xmlXPathContextPtr, void *);
bool hasWideScsiBus;
const char *defaultInitPath;
virDomainXMLNamespace ns;
};

12
src/conf/domain_conf.c
View File

@ -5708,6 +5708,18 @@ static virDomainDefPtr virDomainDefParseXML(virCapsPtr caps,
if (STREQ(def->os.type, "exe")) {
def->os.init = virXPathString("string(./os/init[1])", ctxt);
if (!def->os.init) {
if (caps->defaultInitPath) {
def->os.init = strdup(caps->defaultInitPath);
if (!def->os.init) {
goto no_memory;
}
} else {
virDomainReportError(VIR_ERR_XML_ERROR, "%s",
_("init binary must be specified"));
goto error;
}
}
}
if (STREQ(def->os.type, "xen") ||

4
src/openvz/openvz_conf.c
View File

@ -174,8 +174,10 @@ virCapsPtr openvzCapsInit(void)
0,
NULL) == NULL)
goto no_memory;
return caps;
caps->defaultInitPath = "/sbin/init";
return caps;
no_memory:
virCapabilitiesFree(caps);
return NULL;

14
src/openvz/openvz_driver.c
View File

@ -857,13 +857,6 @@ openvzDomainDefineXML(virConnectPtr conn, const char *xml)
VIR_DOMAIN_XML_INACTIVE)) == NULL)
goto cleanup;
if (vmdef->os.init == NULL) {
if (!(vmdef->os.init = strdup("/sbin/init"))) {
virReportOOMError();
goto cleanup;
}
}
vm = virDomainFindByName(&driver->domains, vmdef->name);
if (vm) {
openvzError(VIR_ERR_OPERATION_FAILED,
@ -943,13 +936,6 @@ openvzDomainCreateXML(virConnectPtr conn, const char *xml,
VIR_DOMAIN_XML_INACTIVE)) == NULL)
goto cleanup;
if (vmdef->os.init == NULL) {
if (!(vmdef->os.init = strdup("/sbin/init"))) {
virReportOOMError();
goto cleanup;
}
}
vm = virDomainFindByName(&driver->domains, vmdef->name);
if (vm) {
openvzError(VIR_ERR_OPERATION_FAILED,