//!
//! Implement the backing store for a given instance
//!
//! @param[in] instance pointer to the instance
//! @param[in] is_migration_dest
//!
//! @return EUCA_OK on success or EUCA_ERROR on failure
//!
//! @pre The instance parameter must not be NULL.
//!
//! @post
//!
int create_instance_backing(ncInstance * instance, boolean is_migration_dest)
{
int rc = 0;
int ret = EUCA_ERROR;
virtualMachine *vm = &(instance->params);
artifact *sentinel = NULL;
char work_prefix[1024] = { 0 }; // {userId}/{instanceId}
// set various instance-directory-relative paths in the instance struct
set_instance_paths(instance);
// ensure instance directory exists
if (ensure_directories_exist(instance->instancePath, 0, NULL, "root", BACKING_DIRECTORY_PERM) == -1)
goto out;
if (strstr(instance->platform, "windows")) {
// generate the floppy file for windows instances
if (makeWindowsFloppy(nc_state.home, instance->instancePath, instance->keyName, instance->instanceId)) {
LOGERROR("[%s] could not create windows bootup script floppy\n", instance->instanceId);
goto out;
} else {
set_path(instance->floppyFilePath, sizeof(instance->floppyFilePath), instance, "floppy");
}
} else if (strlen(instance->instancePk) > 0) { // TODO: credential floppy is limited to Linux instances ATM
LOGDEBUG("[%s] creating floppy for instance credential\n", instance->instanceId);
if (make_credential_floppy(nc_state.home, instance)) {
LOGERROR("[%s] could not create credential floppy\n", instance->instanceId);
goto out;
} else {
set_path(instance->floppyFilePath, sizeof(instance->floppyFilePath), instance, "floppy");
}
}
set_id(instance, NULL, work_prefix, sizeof(work_prefix));
// if this looks like a partition m1.small image, make it a bootable disk
virtualMachine *vm2 = NULL;
LOGDEBUG("vm->virtualBootRecordLen=%d\n", vm->virtualBootRecordLen);
if (vm->virtualBootRecordLen == 5) { // TODO: make this check more robust
// as an experiment, construct a new VBR, without swap and ephemeral
virtualMachine vm_copy;
vm2 = &vm_copy;
memcpy(vm2, vm, sizeof(virtualMachine));
bzero(vm2->virtualBootRecord, EUCA_MAX_VBRS * sizeof(virtualBootRecord));
vm2->virtualBootRecordLen = 0;
virtualBootRecord *emi_vbr = NULL;
for (int i = 0; i < EUCA_MAX_VBRS && i < vm->virtualBootRecordLen; i++) {
virtualBootRecord *vbr = &(vm->virtualBootRecord[i]);
if (vbr->type != NC_RESOURCE_KERNEL && vbr->type != NC_RESOURCE_RAMDISK && vbr->type != NC_RESOURCE_IMAGE)
continue;
if (vbr->type == NC_RESOURCE_IMAGE)
emi_vbr = vbr;
memcpy(vm2->virtualBootRecord + (vm2->virtualBootRecordLen++), vbr, sizeof(virtualBootRecord));
}
if (emi_vbr == NULL) {
LOGERROR("[%s] failed to find EMI among VBR entries\n", instance->instanceId);
goto out;
}
if (vbr_add_ascii("boot:none:104857600:ext3:sda2:none", vm2) != EUCA_OK) {
LOGERROR("[%s] could not add a boot partition VBR entry\n", instance->instanceId);
goto out;
}
if (vbr_parse(vm2, NULL) != EUCA_OK) {
LOGERROR("[%s] could not parse the boot partition VBR entry\n", instance->instanceId);
goto out;
}
// compute tree of dependencies
sentinel = vbr_alloc_tree(vm2, // the struct containing the VBR
TRUE, // we always make the disk bootable, for consistency
TRUE, // make working copy of runtime-modifiable files
is_migration_dest, // tree of an instance on the migration destination
(instance->do_inject_key) ? (instance->keyName) : (NULL), // the SSH key
instance->instanceId); // ID is for logging
if (sentinel == NULL) {
LOGERROR("[%s] failed to prepare backing for instance\n", instance->instanceId);
goto out;
}
LOGDEBUG("disk size prior to tree implementation is = %lld\n", sentinel->deps[0]->size_bytes);
long long right_disk_size = sentinel->deps[0]->size_bytes;
sem_p(disk_sem);
{
// download/create/combine the dependencies
rc = art_implement_tree(sentinel, work_bs, cache_bs, work_prefix, INSTANCE_PREP_TIMEOUT_USEC);
}
sem_v(disk_sem);
if (rc != EUCA_OK) {
LOGERROR("[%s] failed to implement backing for instance\n", instance->instanceId);
goto out;
}
LOGDEBUG("[%s] created the initial bootable disk\n", instance->instanceId);
/* option A starts */
assert(emi_vbr);
assert(sentinel->deps[0]);
strcpy(emi_vbr->guestDeviceName, "sda"); // switch 'sda1' to 'sda' now that we've built the disk
//emi_vbr->sizeBytes = sentinel->deps[0]->size_bytes; // update the size to match the disk
emi_vbr->sizeBytes = right_disk_size; // this is bad...
LOGDEBUG("at boot disk creation time emi_vbr->sizeBytes = %lld\n", emi_vbr->sizeBytes);
euca_strncpy(emi_vbr->id, sentinel->deps[0]->id, SMALL_CHAR_BUFFER_SIZE); // change to the ID of the disk
if (vbr_parse(vm, NULL) != EUCA_OK) {
LOGERROR("[%s] could not parse the boot partition VBR entry\n", instance->instanceId);
goto out;
}
emi_vbr->locationType = NC_LOCATION_NONE; // i.e., it should already exist
art_free(sentinel);
/* option A end */
/* option B starts *
memcpy(vm, vm2, sizeof(virtualMachine));
if (save_instance_struct(instance)) // update instance checkpoint now that the struct got updated
goto out;
ret = EUCA_OK;
goto out;
* option B ends */
}
// compute tree of dependencies
sentinel = vbr_alloc_tree(vm, // the struct containing the VBR
FALSE, // if image had to be made bootable, that was done above
TRUE, // make working copy of runtime-modifiable files
is_migration_dest, // tree of an instance on the migration destination
(instance->do_inject_key) ? (instance->keyName) : (NULL), // the SSH key
instance->instanceId); // ID is for logging
if (sentinel == NULL) {
LOGERROR("[%s] failed to prepare extended backing for instance\n", instance->instanceId);
goto out;
}
sem_p(disk_sem);
{
// download/create/combine the dependencies
rc = art_implement_tree(sentinel, work_bs, cache_bs, work_prefix, INSTANCE_PREP_TIMEOUT_USEC);
}
sem_v(disk_sem);
if (rc != EUCA_OK) {
LOGERROR("[%s] failed to implement backing for instance\n", instance->instanceId);
goto out;
}
if (save_instance_struct(instance)) // update instance checkpoint now that the struct got updated
goto out;
ret = EUCA_OK;
out:
if (sentinel)
art_free(sentinel);
return (ret);
}
//!
//!
//!
//! @param[in] req
//!
//! @return EUCA_OK on success or EUCA_ERROR on failure
//!
int prepare_validate(imager_request * req)
{
int i = 0;
int num_sda_parts = 0;
imager_param *p = NULL;
prepare_params *state = NULL;
print_req(req);
if ((state = EUCA_ZALLOC(1, sizeof(prepare_params))) == NULL)
err("out of memory");
// set defaults
state->bootable = FALSE;
state->cache = TRUE;
state->work = FALSE;
state->action = ACTION_DOWNLOAD | ACTION_CONVERT;
// record in 'state' all specified parameters
for (p = req->params; p != NULL && p->key != NULL; p++) {
if (strcmp(p->key, _CACHE) == 0) {
state->cache = parse_boolean(p->val);
} else if (strcmp(p->key, _BOOT) == 0) {
state->bootable = parse_boolean(p->val);
} else if (strcmp(p->key, _ID) == 0) {
state->id = p->val;
} else if (strcmp(p->key, _KEY) == 0) {
state->sshkey = parse_loginpassword(p->val);
} else if (strcmp(p->key, _OUT) == 0) {
state->out = p->val;
} else if (strcmp(p->key, _WORK) == 0) {
state->work = parse_boolean(p->val);
} else if (strcmp(p->key, _VBR) == 0) {
if (state->total_vbrs == (EUCA_MAX_VBRS - 1))
err("too many vbr= parameters");
state->vbrs[state->total_vbrs++] = p->val;
if (strstr(p->val, ":sda1:") != NULL || strstr(p->val, ":sda2:") != NULL || strstr(p->val, ":sda3:") != NULL) {
num_sda_parts++;
}
} else if (strcmp(p->key, _ACTION) == 0) {
if (strcmp(p->val, "download") == 0) {
state->action = ACTION_DOWNLOAD;
} else if (strcmp(p->val, "convert") == 0) {
state->action = ACTION_CONVERT;
} else {
err("unknown action parameter '%s' for command 'prepare'", p->val);
}
} else {
err("invalid parameter '%s' for command 'prepare'", p->key);
}
}
// ensure mandatory params are present
if (state->total_vbrs < 1)
err("not a single VBR was specified");
LOGINFO("actions: download=%s convert=%s\n",
(state->action & ACTION_DOWNLOAD) ? ("yes") : ("no"),
(state->action & ACTION_CONVERT) ? ("yes") : ("no"))
// if a bootable disk is requested and the expected number of partitions is present,
// then add the boot VBR entry so an extra, 4th, boot partition will get created
if (state->bootable && num_sda_parts > 0) {
char buf[1024];
snprintf(buf, sizeof(buf), BOOT_VBR_FORMAT, num_sda_parts+1);
state->vbrs[state->total_vbrs++] = strdup(buf);
}
for (i = 0; i < state->total_vbrs; i++) {
if (vbr_add_ascii(state->vbrs[i], &(state->vm)))
err("failed to add VBR record '%s'", state->vbrs[i]);
}
if (vbr_parse(&(state->vm), NULL) != EUCA_OK)
err("failed to validate VBR records");
// if given an empty key file, just set the pointer to NULL
if (state->sshkey && strlen(state->sshkey) == 0) {
EUCA_FREE(state->sshkey);
}
// save pointer to find it later
req->internal = ((void *)state);
return (EUCA_OK);
}
