/*
- Bacula® - The Network Backup Solution
-
- Copyright (C) 2000-20076 Free Software Foundation Europe e.V.
-
- The main author of Bacula is Kern Sibbald, with contributions from
- many others, a complete list can be found in the file AUTHORS.
- This program is Free Software; you can redistribute it and/or
- modify it under the terms of version two of the GNU General Public
- License as published by the Free Software Foundation plus additions
- that are listed in the file LICENSE.
-
- This program 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
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA.
-
- Bacula® is a registered trademark of John Walker.
- The licensor of Bacula is the Free Software Foundation Europe
- (FSFE), Fiduciary Program, Sumatrastrasse 25, 8006 Zürich,
- Switzerland, email:ftf@fsfeurope.org.
+ Bacula(R) - The Network Backup Solution
+
+ Copyright (C) 2000-2017 Kern Sibbald
+
+ The original author of Bacula is Kern Sibbald, with contributions
+ from many others, a complete list can be found in the file AUTHORS.
+
+ You may use this file and others of this release according to the
+ license defined in the LICENSE file, which includes the Affero General
+ Public License, v3.0 ("AGPLv3") and some additional permissions and
+ terms pursuant to its AGPLv3 Section 7.
+
+ This notice must be preserved when any source code is
+ conveyed and/or propagated.
+
+ Bacula(R) is a registered trademark of Kern Sibbald.
*/
/*
- *
* Bacula Director -- msgchan.c -- handles the message channel
* to the Storage daemon and the File daemon.
*
- * Kern Sibbald, August MM
+ * Written by Kern Sibbald, August MM
*
* This routine runs as a thread and must be thread reentrant.
*
* to authenticate ourself and to pass the JobId.
* Create a thread to interact with the Storage daemon
* who returns a job status and requests Catalog services, etc.
- *
- * Version $Id$
*/
#include "bacula.h"
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
/* Commands sent to Storage daemon */
-static char jobcmd[] = "JobId=%s job=%s job_name=%s client_name=%s "
+static char jobcmd[] = "JobId=%s job=%s job_name=%s client_name=%s "
"type=%d level=%d FileSet=%s NoAttr=%d SpoolAttr=%d FileSetMD5=%s "
- "SpoolData=%d WritePartAfterJob=%d PreferMountedVols=%d\n";
+ "SpoolData=%d WritePartAfterJob=%d PreferMountedVols=%d SpoolSize=%s "
+ "rerunning=%d VolSessionId=%d VolSessionTime=%d sd_client=%d "
+ "Authorization=%s\n";
static char use_storage[] = "use storage=%s media_type=%s pool_name=%s "
"pool_type=%s append=%d copy=%d stripe=%d\n";
static char use_device[] = "use device=%s\n";
/* Storage Daemon requests */
static char Job_start[] = "3010 Job %127s start\n";
static char Job_end[] =
- "3099 Job %127s end JobStatus=%d JobFiles=%d JobBytes=%" lld "\n";
+ "3099 Job %127s end JobStatus=%d JobFiles=%d JobBytes=%lld JobErrors=%u ErrMsg=%256s\n";
/* Forward referenced functions */
extern "C" void *msg_thread(void *arg);
+BSOCK *open_sd_bsock(UAContext *ua)
+{
+ STORE *store = ua->jcr->wstore;
+
+ if (!is_bsock_open(ua->jcr->store_bsock)) {
+ ua->send_msg(_("Connecting to Storage daemon %s at %s:%d ...\n"),
+ store->name(), store->address, store->SDport);
+ if (!connect_to_storage_daemon(ua->jcr, 10, SDConnectTimeout, 1)) {
+ ua->error_msg(_("Failed to connect to Storage daemon.\n"));
+ return NULL;
+ }
+ }
+ return ua->jcr->store_bsock;
+}
+
+void close_sd_bsock(UAContext *ua)
+{
+ if (ua->jcr->store_bsock) {
+ ua->jcr->store_bsock->signal(BNET_TERMINATE);
+ free_bsock(ua->jcr->store_bsock);
+ }
+}
+
/*
* Establish a message channel connection with the Storage daemon
* and perform authentication.
bool connect_to_storage_daemon(JCR *jcr, int retry_interval,
int max_retry_time, int verbose)
{
- BSOCK *sd;
+ BSOCK *sd = jcr->store_bsock;
STORE *store;
- utime_t heart_beat;
+ utime_t heart_beat;
- if (jcr->store_bsock) {
+ if (is_bsock_open(sd)) {
return true; /* already connected */
}
+ if (!sd) {
+ sd = new_bsock();
+ }
/* If there is a write storage use it */
if (jcr->wstore) {
if (store->heartbeat_interval) {
heart_beat = store->heartbeat_interval;
- } else {
+ } else {
heart_beat = director->heartbeat_interval;
}
/*
* Open message channel with the Storage daemon
*/
- Dmsg2(100, "bnet_connect to Storage daemon %s:%d\n", store->address,
+ Dmsg2(100, "Connect to Storage daemon %s:%d\n", store->address,
store->SDport);
- sd = bnet_connect(jcr, retry_interval, max_retry_time, heart_beat,
- _("Storage daemon"), store->address,
- NULL, store->SDport, verbose);
+ sd->set_source_address(director->DIRsrc_addr);
+ if (!sd->connect(jcr, retry_interval, max_retry_time, heart_beat, _("Storage daemon"),
+ store->address, NULL, store->SDport, verbose)) {
+
+ if (!jcr->store_bsock) { /* The bsock was locally created, so we free it here */
+ free_bsock(sd);
+ }
+ sd = NULL;
+ }
+
if (sd == NULL) {
return false;
}
jcr->store_bsock = sd;
if (!authenticate_storage_daemon(jcr, store)) {
- bnet_close(sd);
- jcr->store_bsock = NULL;
+ sd->close();
return false;
}
return true;
}
/*
- * Here we ask the SD to send us the info for a
+ * Here we ask the SD to send us the info for a
* particular device resource.
*/
-#ifdef needed
+#ifdef xxx
bool update_device_res(JCR *jcr, DEVICE *dev)
{
- POOL_MEM device_name;
+ POOL_MEM device_name;
BSOCK *sd;
if (!connect_to_storage_daemon(jcr, 5, 30, 0)) {
return false;
}
sd = jcr->store_bsock;
- pm_strcpy(device_name, dev->hdr.name);
+ pm_strcpy(device_name, dev->name());
bash_spaces(device_name);
- bnet_fsend(sd, query_device, device_name.c_str());
+ sd->fsend(query_device, device_name.c_str());
Dmsg1(100, ">stored: %s\n", sd->msg);
/* The data is returned through Device_update */
if (bget_dirmsg(sd) <= 0) {
}
#endif
+static char OKbootstrap[] = "3000 OK bootstrap\n";
+
/*
* Start a job with the Storage daemon
*/
-bool start_storage_daemon_job(JCR *jcr, alist *rstore, alist *wstore)
+bool start_storage_daemon_job(JCR *jcr, alist *rstore, alist *wstore, bool send_bsr)
{
bool ok = true;
STORE *storage;
BSOCK *sd;
- char auth_key[100];
+ char sd_auth_key[100];
POOL_MEM store_name, device_name, pool_name, pool_type, media_type;
POOL_MEM job_name, client_name, fileset_name;
int copy = 0;
int stripe = 0;
- char ed1[30];
+ char ed1[30], ed2[30];
+ int sd_client;
sd = jcr->store_bsock;
/*
* Now send JobId and permissions, and get back the authorization key.
*/
- pm_strcpy(job_name, jcr->job->hdr.name);
+ pm_strcpy(job_name, jcr->job->name());
bash_spaces(job_name);
- pm_strcpy(client_name, jcr->client->hdr.name);
+ if (jcr->client) {
+ pm_strcpy(client_name, jcr->client->name());
+ } else {
+ pm_strcpy(client_name, "**Dummy**");
+ }
bash_spaces(client_name);
- pm_strcpy(fileset_name, jcr->fileset->hdr.name);
+ pm_strcpy(fileset_name, jcr->fileset->name());
bash_spaces(fileset_name);
if (jcr->fileset->MD5[0] == 0) {
bstrncpy(jcr->fileset->MD5, "**Dummy**", sizeof(jcr->fileset->MD5));
* for the same jobid.
*/
if (jcr->reschedule_count) {
- bnet_fsend(sd, "cancel Job=%s\n", jcr->Job);
- while (bnet_recv(sd) >= 0)
+ sd->fsend("cancel Job=%s\n", jcr->Job);
+ while (sd->recv() >= 0)
{ }
- }
- bnet_fsend(sd, jobcmd, edit_int64(jcr->JobId, ed1), jcr->Job,
- job_name.c_str(), client_name.c_str(),
- jcr->JobType, jcr->JobLevel,
- fileset_name.c_str(), !jcr->pool->catalog_files,
- jcr->job->SpoolAttributes, jcr->fileset->MD5, jcr->spool_data,
- jcr->write_part_after_job, jcr->job->PreferMountedVolumes);
- Dmsg1(100, ">stored: %s\n", sd->msg);
+ }
+
+ sd_client = jcr->sd_client;
+ if (jcr->sd_auth_key) {
+ bstrncpy(sd_auth_key, jcr->sd_auth_key, sizeof(sd_auth_key));
+ } else {
+ bstrncpy(sd_auth_key, "dummy", sizeof(sd_auth_key));
+ }
+
+ sd->fsend(jobcmd, edit_int64(jcr->JobId, ed1), jcr->Job,
+ job_name.c_str(), client_name.c_str(),
+ jcr->getJobType(), jcr->getJobLevel(),
+ fileset_name.c_str(), !jcr->pool->catalog_files,
+ jcr->job->SpoolAttributes, jcr->fileset->MD5, jcr->spool_data,
+ jcr->write_part_after_job, jcr->job->PreferMountedVolumes,
+ edit_int64(jcr->spool_size, ed2), jcr->rerunning,
+ jcr->VolSessionId, jcr->VolSessionTime, sd_client,
+ sd_auth_key);
+
+ Dmsg1(100, ">stored: %s", sd->msg);
+ Dmsg2(100, "=== rstore=%p wstore=%p\n", rstore, wstore);
if (bget_dirmsg(sd) > 0) {
Dmsg1(100, "<stored: %s", sd->msg);
if (sscanf(sd->msg, OKjob, &jcr->VolSessionId,
- &jcr->VolSessionTime, &auth_key) != 3) {
+ &jcr->VolSessionTime, &sd_auth_key) != 3) {
Dmsg1(100, "BadJob=%s\n", sd->msg);
Jmsg(jcr, M_FATAL, 0, _("Storage daemon rejected Job command: %s\n"), sd->msg);
- return 0;
+ return false;
} else {
- jcr->sd_auth_key = bstrdup(auth_key);
+ bfree_and_null(jcr->sd_auth_key);
+ jcr->sd_auth_key = bstrdup(sd_auth_key);
Dmsg1(150, "sd_auth_key=%s\n", jcr->sd_auth_key);
}
} else {
Jmsg(jcr, M_FATAL, 0, _("<stored: bad response to Job command: %s\n"),
- bnet_strerror(sd));
- return 0;
+ sd->bstrerror());
+ return false;
+ }
+
+ if (send_bsr && (!send_bootstrap_file(jcr, sd) ||
+ !response(jcr, sd, OKbootstrap, "Bootstrap", DISPLAY_ERROR))) {
+ return false;
}
/*
- * We have two loops here. The first comes from the
- * Storage = associated with the Job, and we need
+ * We have two loops here. The first comes from the
+ * Storage = associated with the Job, and we need
* to attach to each one.
* The inner loop loops over all the alternative devices
* associated with each Storage. It selects the first
*/
/* Do read side of storage daemon */
if (ok && rstore) {
- /* For the moment, only migrate has rpool */
- if (jcr->JobType == JT_MIGRATE) {
+ /* For the moment, only migrate, copy and vbackup have rpool */
+ if (jcr->is_JobType(JT_MIGRATE) || jcr->is_JobType(JT_COPY) ||
+ (jcr->is_JobType(JT_BACKUP) && jcr->is_JobLevel(L_VIRTUAL_FULL))) {
pm_strcpy(pool_type, jcr->rpool->pool_type);
pm_strcpy(pool_name, jcr->rpool->name());
} else {
bash_spaces(pool_name);
foreach_alist(storage, rstore) {
Dmsg1(100, "Rstore=%s\n", storage->name());
+ pm_strcpy(store_name, storage->name());
bash_spaces(store_name);
- pm_strcpy(media_type, storage->media_type);
+ if (jcr->media_type) {
+ pm_strcpy(media_type, jcr->media_type); /* user override */
+ } else {
+ pm_strcpy(media_type, storage->media_type);
+ }
bash_spaces(media_type);
- bnet_fsend(sd, use_storage, store_name.c_str(), media_type.c_str(),
- pool_name.c_str(), pool_type.c_str(), 0, copy, stripe);
+ sd->fsend(use_storage, store_name.c_str(), media_type.c_str(),
+ pool_name.c_str(), pool_type.c_str(), 0, copy, stripe);
Dmsg1(100, "rstore >stored: %s", sd->msg);
DEVICE *dev;
/* Loop over alternative storage Devices until one is OK */
foreach_alist(dev, storage->device) {
- pm_strcpy(device_name, dev->hdr.name);
+ pm_strcpy(device_name, dev->name());
bash_spaces(device_name);
- bnet_fsend(sd, use_device, device_name.c_str());
+ sd->fsend(use_device, device_name.c_str());
Dmsg1(100, ">stored: %s", sd->msg);
}
- bnet_sig(sd, BNET_EOD); /* end of Devices */
+ sd->signal(BNET_EOD); /* end of Devices */
}
- bnet_sig(sd, BNET_EOD); /* end of Storages */
+ sd->signal(BNET_EOD); /* end of Storages */
if (bget_dirmsg(sd) > 0) {
Dmsg1(100, "<stored: %s", sd->msg);
/* ****FIXME**** save actual device name */
} else {
ok = false;
}
+ if (ok) {
+ Jmsg(jcr, M_INFO, 0, _("Using Device \"%s\" to read.\n"), device_name.c_str());
+ }
}
/* Do write side of storage daemon */
bash_spaces(pool_type);
bash_spaces(pool_name);
foreach_alist(storage, wstore) {
+ Dmsg1(100, "Wstore=%s\n", storage->name());
pm_strcpy(store_name, storage->name());
bash_spaces(store_name);
pm_strcpy(media_type, storage->media_type);
bash_spaces(media_type);
- bnet_fsend(sd, use_storage, store_name.c_str(), media_type.c_str(),
- pool_name.c_str(), pool_type.c_str(), 1, copy, stripe);
+ sd->fsend(use_storage, store_name.c_str(), media_type.c_str(),
+ pool_name.c_str(), pool_type.c_str(), 1, copy, stripe);
Dmsg1(100, "wstore >stored: %s", sd->msg);
DEVICE *dev;
/* Loop over alternative storage Devices until one is OK */
foreach_alist(dev, storage->device) {
- pm_strcpy(device_name, dev->hdr.name);
+ pm_strcpy(device_name, dev->name());
bash_spaces(device_name);
- bnet_fsend(sd, use_device, device_name.c_str());
+ sd->fsend(use_device, device_name.c_str());
Dmsg1(100, ">stored: %s", sd->msg);
}
- bnet_sig(sd, BNET_EOD); /* end of Devices */
+ sd->signal(BNET_EOD); /* end of Devices */
}
- bnet_sig(sd, BNET_EOD); /* end of Storages */
+ sd->signal(BNET_EOD); /* end of Storages */
if (bget_dirmsg(sd) > 0) {
Dmsg1(100, "<stored: %s", sd->msg);
/* ****FIXME**** save actual device name */
} else {
ok = false;
}
+ if (ok) {
+ Jmsg(jcr, M_INFO, 0, _("Using Device \"%s\" to write.\n"), device_name.c_str());
+ }
}
if (!ok) {
POOL_MEM err_msg;
Jmsg(jcr, M_FATAL, 0, _("\n"
" Storage daemon didn't accept Device \"%s\" because:\n %s"),
device_name.c_str(), err_msg.c_str()/* sd->msg */);
- } else {
+ } else {
Jmsg(jcr, M_FATAL, 0, _("\n"
- " Storage daemon didn't accept Device \"%s\" command.\n"),
+ " Storage daemon didn't accept Device \"%s\" command.\n"),
device_name.c_str());
}
- } else {
- Jmsg(jcr, M_INFO, 0, _("Using Device \"%s\"\n"), device_name.c_str());
}
return ok;
}
jcr->inc_use_count(); /* mark in use by msg thread */
jcr->sd_msg_thread_done = false;
- jcr->SD_msg_chan = 0;
- Dmsg0(100, "Start SD msg_thread.\n");
+ jcr->SD_msg_chan_started = false;
+ Dmsg0(150, "Start SD msg_thread.\n");
if ((status=pthread_create(&thid, NULL, msg_thread, (void *)jcr)) != 0) {
berrno be;
- Jmsg1(jcr, M_ABORT, 0, _("Cannot create message thread: %s\n"), be.strerror(status));
+ Jmsg1(jcr, M_ABORT, 0, _("Cannot create message thread: %s\n"), be.bstrerror(status));
}
/* Wait for thread to start */
- while (jcr->SD_msg_chan == 0) {
+ while (jcr->SD_msg_chan_started == false) {
bmicrosleep(0, 50);
if (job_canceled(jcr) || jcr->sd_msg_thread_done) {
return false;
}
}
- Dmsg1(100, "SD msg_thread started. use=%d\n", jcr->use_count());
+ Dmsg1(150, "SD msg_thread started. use=%d\n", jcr->use_count());
return true;
}
extern "C" void msg_thread_cleanup(void *arg)
{
JCR *jcr = (JCR *)arg;
- db_end_transaction(jcr, jcr->db); /* terminate any open transaction */
+ db_end_transaction(jcr, jcr->db); /* terminate any open transaction */
+ jcr->lock();
jcr->sd_msg_thread_done = true;
- jcr->SD_msg_chan = 0;
+ jcr->SD_msg_chan_started = false;
+ jcr->unlock();
pthread_cond_broadcast(&jcr->term_wait); /* wakeup any waiting threads */
- Dmsg1(100, "=== End msg_thread. use=%d\n", jcr->use_count());
- free_jcr(jcr); /* release jcr */
+ Dmsg2(100, "=== End msg_thread. JobId=%d usecnt=%d\n", jcr->JobId, jcr->use_count());
+ db_thread_cleanup(jcr->db); /* remove thread specific data */
+ free_jcr(jcr); /* release jcr */
}
/*
JCR *jcr = (JCR *)arg;
BSOCK *sd;
int JobStatus;
+ int n;
char Job[MAX_NAME_LENGTH];
- uint32_t JobFiles;
+ char ErrMsg[256];
+ uint32_t JobFiles, JobErrors;
uint64_t JobBytes;
- int stat;
+ ErrMsg[0] = 0;
pthread_detach(pthread_self());
+ set_jcr_in_tsd(jcr);
jcr->SD_msg_chan = pthread_self();
+ jcr->SD_msg_chan_started = true;
pthread_cleanup_push(msg_thread_cleanup, arg);
sd = jcr->store_bsock;
/* Read the Storage daemon's output.
*/
Dmsg0(100, "Start msg_thread loop\n");
- while (!job_canceled(jcr) && bget_dirmsg(sd) >= 0) {
+ n = 0;
+ while (!job_canceled(jcr) && (n=bget_dirmsg(sd)) >= 0) {
Dmsg1(400, "<stored: %s", sd->msg);
if (sscanf(sd->msg, Job_start, Job) == 1) {
continue;
}
- if ((stat=sscanf(sd->msg, Job_end, Job, &JobStatus, &JobFiles,
- &JobBytes)) == 4) {
+ if (sscanf(sd->msg, Job_end, Job, &JobStatus, &JobFiles,
+ &JobBytes, &JobErrors, ErrMsg) == 6) {
jcr->SDJobStatus = JobStatus; /* termination status */
jcr->SDJobFiles = JobFiles;
jcr->SDJobBytes = JobBytes;
+ jcr->SDErrors = JobErrors;
+ unbash_spaces(ErrMsg); /* Error message if any */
+ pm_strcpy(jcr->StatusErrMsg, ErrMsg);
break;
}
- Dmsg2(400, "end loop stat=%d use=%d\n", stat, jcr->use_count());
+ Dmsg1(400, "end loop use=%d\n", jcr->use_count());
}
- if (is_bnet_error(sd)) {
+ if (n == BNET_HARDEOF && jcr->getJobStatus() != JS_Canceled) {
+ /*
+ * This probably should be M_FATAL, but I am not 100% sure
+ * that this return *always* corresponds to a dropped line.
+ */
+ Qmsg(jcr, M_ERROR, 0, _("Director's connection to SD for this Job was lost.\n"));
+ }
+ if (jcr->getJobStatus() == JS_Canceled) {
+ jcr->SDJobStatus = JS_Canceled;
+ } else if (sd->is_error()) {
jcr->SDJobStatus = JS_ErrorTerminated;
}
pthread_cleanup_pop(1); /* remove and execute the handler */
P(mutex);
pthread_cond_timedwait(&jcr->term_wait, &mutex, &timeout);
V(mutex);
- if (job_canceled(jcr)) {
- if (jcr->SD_msg_chan) {
- jcr->store_bsock->timed_out = 1;
- jcr->store_bsock->terminated = 1;
- Dmsg2(400, "kill jobid=%d use=%d\n", (int)jcr->JobId, jcr->use_count());
- pthread_kill(jcr->SD_msg_chan, TIMEOUT_SIGNAL);
+ if (jcr->is_canceled()) {
+ if (jcr->SD_msg_chan_started) {
+ jcr->store_bsock->set_timed_out();
+ jcr->store_bsock->set_terminated();
+ sd_msg_thread_send_signal(jcr, TIMEOUT_SIGNAL);
}
cancel_count++;
}
break;
}
}
- set_jcr_job_status(jcr, JS_Terminated);
+ jcr->setJobStatus(JS_Terminated);
}
+/*
+ * Send bootstrap file to Storage daemon.
+ * This is used for restore, verify VolumeToCatalog, migration,
+ * and copy Jobs.
+ */
+bool send_bootstrap_file(JCR *jcr, BSOCK *sd)
+{
+ FILE *bs;
+ char buf[1000];
+ const char *bootstrap = "bootstrap\n";
+
+ Dmsg1(400, "send_bootstrap_file: %s\n", jcr->RestoreBootstrap);
+ if (!jcr->RestoreBootstrap) {
+ return true;
+ }
+ bs = bfopen(jcr->RestoreBootstrap, "rb");
+ if (!bs) {
+ berrno be;
+ Jmsg(jcr, M_FATAL, 0, _("Could not open bootstrap file %s: ERR=%s\n"),
+ jcr->RestoreBootstrap, be.bstrerror());
+ jcr->setJobStatus(JS_ErrorTerminated);
+ return false;
+ }
+ sd->fsend(bootstrap);
+ while (fgets(buf, sizeof(buf), bs)) {
+ sd->fsend("%s", buf);
+ }
+ sd->signal(BNET_EOD);
+ fclose(bs);
+ if (jcr->unlink_bsr) {
+ unlink(jcr->RestoreBootstrap);
+ jcr->unlink_bsr = false;
+ }
+ return true;
+}
+
+
#ifdef needed
#define MAX_TRIES 30
#define WAIT_TIME 2
LockRes();
foreach_res(dev, R_DEVICE) {
if (!update_device_res(jcr, dev)) {
- Dmsg1(900, "Error updating device=%s\n", dev->hdr.name);
+ Dmsg1(900, "Error updating device=%s\n", dev->name());
} else {
- Dmsg1(900, "Updated Device=%s\n", dev->hdr.name);
+ Dmsg1(900, "Updated Device=%s\n", dev->name());
}
}
UnlockRes();
- bnet_close(jcr->store_bsock);
- jcr->store_bsock = NULL;
+ free_bsock(jcr->store_bsock);
break;
}
Dmsg0(100, "Start Device thread.\n");
if ((status=pthread_create(&thid, NULL, device_thread, NULL)) != 0) {
berrno be;
- Jmsg1(NULL, M_ABORT, 0, _("Cannot create message thread: %s\n"), be.strerror(status));
+ Jmsg1(NULL, M_ABORT, 0, _("Cannot create message thread: %s\n"), be.bstrerror(status));
}
}
#endif
projects / bacula / bacula / blobdiff