int libxl__set_domain_configuration(libxl__gc *gc, uint32_t domid,
libxl_domain_config *d_config)
{
char *d_config_json;
int rc;
d_config_json = libxl_domain_config_to_json(CTX, d_config);
if (!d_config_json) {
LOGED(ERROR, domid,
"failed to convert domain configuration to JSON");
rc = ERROR_FAIL;
goto out;
}
rc = libxl__userdata_store(gc, domid, "libxl-json",
(const uint8_t *)d_config_json,
strlen(d_config_json) + 1 /* include '\0' */);
if (rc) {
LOGEVD(ERROR, rc, domid, "failed to store domain configuration");
rc = ERROR_FAIL;
goto out;
}
out:
free(d_config_json);
return rc;
}
int libxl__get_domain_configuration(libxl__gc *gc, uint32_t domid,
libxl_domain_config *d_config)
{
uint8_t *data = NULL;
int rc, len;
rc = libxl__userdata_retrieve(gc, domid, "libxl-json", &data, &len);
if (rc) {
LOGEVD(ERROR, rc, domid,
"failed to retrieve domain configuration");
rc = ERROR_FAIL;
goto out;
}
if (len == 0) {
/* No logging, not necessary an error from caller's PoV. */
rc = ERROR_JSON_CONFIG_EMPTY;
goto out;
}
rc = libxl_domain_config_from_json(CTX, d_config, (const char *)data);
out:
free(data);
return rc;
}
int libxl__domain_rename(libxl__gc *gc, uint32_t domid,
const char *old_name, const char *new_name,
xs_transaction_t trans)
{
libxl_ctx *ctx = libxl__gc_owner(gc);
char *dom_path = 0;
const char *name_path;
char *got_old_name;
unsigned int got_old_len;
xs_transaction_t our_trans = 0;
uint32_t stub_dm_domid;
const char *stub_dm_old_name = NULL, *stub_dm_new_name = NULL;
int rc;
libxl_dominfo info;
char *uuid;
const char *vm_name_path;
libxl_dominfo_init(&info);
dom_path = libxl__xs_get_dompath(gc, domid);
if (!dom_path) goto x_nomem;
name_path= GCSPRINTF("%s/name", dom_path);
if (!name_path) goto x_nomem;
stub_dm_domid = libxl_get_stubdom_id(CTX, domid);
if (stub_dm_domid) {
stub_dm_old_name = libxl__stub_dm_name(gc, old_name);
stub_dm_new_name = libxl__stub_dm_name(gc, new_name);
}
retry_transaction:
if (!trans) {
trans = our_trans = xs_transaction_start(ctx->xsh);
if (!our_trans) {
LOGEVD(ERROR, errno, domid, "Create xs transaction for domain (re)name");
goto x_fail;
}
}
if (!new_name) {
LOGD(ERROR, domid, "New domain name not specified");
rc = ERROR_INVAL;
goto x_rc;
}
if (new_name[0]) {
/* nonempty names must be unique */
uint32_t domid_e;
rc = libxl_name_to_domid(ctx, new_name, &domid_e);
if (rc == ERROR_INVAL) {
/* no such domain, good */
} else if (rc != 0) {
LOGD(ERROR, domid, "Unexpected error checking for existing domain");
goto x_rc;
} else if (domid_e == domid) {
/* domain already has this name, ok (but we do still
* need the rest of the code as we may need to check
* old_name, for example). */
} else {
LOGD(ERROR, domid, "Domain with name \"%s\" already exists.", new_name);
rc = ERROR_INVAL;
goto x_rc;
}
}
if (old_name) {
got_old_name = xs_read(ctx->xsh, trans, name_path, &got_old_len);
if (!got_old_name) {
LOGEVD(ERROR, errno, domid,
"Check old name for domain allegedly named `%s'",
old_name);
goto x_fail;
}
if (strcmp(old_name, got_old_name)) {
LOGD(ERROR, domid,
"Allegedly named `%s' is actually named `%s' - racing ?",
old_name,
got_old_name);
free(got_old_name);
goto x_fail;
}
free(got_old_name);
}
if (!xs_write(ctx->xsh, trans, name_path,
new_name, strlen(new_name))) {
LOGD(ERROR, domid,
"Failed to write new name `%s'"
" for domain previously named `%s'",
new_name,
old_name);
goto x_fail;
}
/* update /vm/<uuid>/name */
rc = libxl_domain_info(ctx, &info, domid);
if (rc)
goto x_rc;
uuid = GCSPRINTF(LIBXL_UUID_FMT, LIBXL_UUID_BYTES(info.uuid));
vm_name_path = GCSPRINTF("/vm/%s/name", uuid);
if (libxl__xs_write_checked(gc, trans, vm_name_path, new_name))
goto x_fail;
if (stub_dm_domid) {
rc = libxl__domain_rename(gc, stub_dm_domid,
stub_dm_old_name,
stub_dm_new_name,
trans);
if (rc) {
LOGED(ERROR, domid, "Unable to rename stub-domain");
goto x_rc;
}
}
if (our_trans) {
if (!xs_transaction_end(ctx->xsh, our_trans, 0)) {
trans = our_trans = 0;
if (errno != EAGAIN) {
LOGD(ERROR, domid,
"Failed to commit new name `%s'"
" for domain previously named `%s'",
new_name,
old_name);
goto x_fail;
}
LOGD(DEBUG, domid,
"Need to retry rename transaction"
" for domain (name_path=\"%s\", new_name=\"%s\")",
name_path,
new_name);
goto retry_transaction;
}
our_trans = 0;
}
rc = 0;
x_rc:
if (our_trans) xs_transaction_end(ctx->xsh, our_trans, 1);
libxl_dominfo_dispose(&info);
return rc;
x_fail: rc = ERROR_FAIL; goto x_rc;
x_nomem: rc = ERROR_NOMEM; goto x_rc;
}
