Fossil

/*
** Return true if the blob contains a valid UUID_SIZE-digit base16 identifier.
*/
int blob_is_uuid(Blob *pBlob){
  return blob_size(pBlob)==UUID_SIZE
         && validate16(blob_buffer(pBlob), UUID_SIZE);
}

/*
** Return true if the blob contains a valid filename
*/
int blob_is_filename(Blob *pBlob){
  return file_is_simple_pathname(blob_str(pBlob), 1);
}

/*
** Return true if the blob contains a valid 32-bit integer.  Store
** the integer value in *pValue.
*/
int blob_is_int(Blob *pBlob, int *pValue){
  const char *z = blob_buffer(pBlob);
  int i, n, c, v;
  n = blob_size(pBlob);
  v = 0;
  for(i=0; i<n && (c = z[i])!=0 && c>='0' && c<='9'; i++){
    v = v*10 + c - '0';
  }
  if( i==n ){
    *pValue = v;
    return 1;
  }else{
    return 0;
  }
}

/*
** Return true if the blob contains a valid 64-bit integer.  Store
** the integer value in *pValue.
*/
int blob_is_int64(Blob *pBlob, sqlite3_int64 *pValue){
  const char *z = blob_buffer(pBlob);
  int i, n, c;
  sqlite3_int64 v;
  n = blob_size(pBlob);
  v = 0;
  for(i=0; i<n && (c = z[i])!=0 && c>='0' && c<='9'; i++){
    v = v*10 + c - '0';
  }
  if( i==n ){
    *pValue = v;
    return 1;

          goto doc_not_found;
        }
      }else{
        goto doc_not_found;
      }
    }
    if( isUV ){





      if( unversioned_content(zName, &filebody)==0 ){
        rid = 1;
        zDfltTitle = zName;
      }
    }else if( fossil_strcmp(zCheckin,"ckout")==0 ){
      /* Read from the local checkout */
      char *zFullpath;
      db_must_be_within_tree();

  }
  /* The --verily option to sync, push, and pull forces extra igot cards
  ** to be exchanged.  This can overcome malfunctions in the sync protocol.
  */
  if( find_option("verily",0,0)!=0 ){
    *pSyncFlags |= SYNC_RESYNC;
  }
  if( find_option("uv",0,0)!=0 ){
    *pSyncFlags |= SYNC_UNVERSIONED;
  }
  url_proxy_options();
  clone_ssh_find_options();
  db_find_and_open_repository(0, 0);
  db_open_config(0, 0);
  if( g.argc==2 ){
    if( db_get_boolean("auto-shun",1) ) configSync = CONFIGSET_SHUN;
  }else if( g.argc==3 ){

** SQL code to implement the tables needed by the unversioned.
*/
static const char zUnversionedInit[] =
@ CREATE TABLE IF NOT EXISTS "%w".unversioned(
@   name TEXT PRIMARY KEY,       -- Name of the uv file
@   rcvid INTEGER,               -- Where received from
@   mtime DATETIME,              -- timestamp.  Seconds since 1970.
@   hash TEXT,                   -- Content hash.  NULL if a delete marker 
@   sz INTEGER,                  -- size of content after decompression
@   encoding INT,                -- 0: plaintext.  1: zlib compressed
@   content BLOB                 -- content of the file.  NULL if oversized
@ ) WITHOUT ROWID;
;

/*
** Make sure the unversioned table exists in the repository.
*/
void unversioned_schema(void){

    }
    db_finalize(&q);
    db_set("uv-hash", sha1sum_finish(0), 0);
    zHash = db_get("uv-hash",0);
  }
  return zHash;
}

/*
** Initialize pContent to be the content of an unversioned file zName.
**
** Return 0 on success.  Return 1 if zName is not found.
*/
int unversioned_content(const char *zName, Blob *pContent){
  Stmt q;
  int rc = 1;
  blob_init(pContent, 0, 0);
  db_prepare(&q, "SELECT encoding, content FROM unversioned WHERE name=%Q", zName);
  if( db_step(&q)==SQLITE_ROW ){
    db_column_blob(&q, 1, pContent);
    if( db_column_int(&q, 0)==1 ){
      blob_uncompress(pContent, pContent);
    }
    rc = 0;
  }
  db_finalize(&q);
  return rc;
}

/*
** COMMAND: unversioned
**
** Usage: %fossil unversioned SUBCOMMAND ARGS...
**
** Unversioned files (UV-files) are artifacts that are synced and are available

    zAs = find_option("as",0,1);
    if( zAs && g.argc!=4 ) usage("add DISKFILE --as UVFILE");
    verify_all_options();
    db_begin_transaction();
    content_rcvid_init();
    db_prepare(&ins,
      "REPLACE INTO unversioned(name,rcvid,mtime,hash,sz,encoding,content)"
      " VALUES(:name,:rcvid,:mtime,:hash,:sz,:encoding,:content)"
    );
    for(i=3; i<g.argc; i++){
      zIn = zAs ? zAs : g.argv[i];
      if( zIn[0]==0 || zIn[0]=='/' || !file_is_simple_pathname(zIn,1) ){
        fossil_fatal("'%Q' is not an acceptable filename", zIn);
      }
      blob_init(&file,0,0);
      blob_read_from_file(&file, g.argv[i]);
      sha1sum_blob(&file, &hash);
      blob_compress(&file, &compressed);
      db_bind_text(&ins, ":name", zIn);
      db_bind_int(&ins, ":rcvid", g.rcvid);
      db_bind_int64(&ins, ":mtime", mtime);
      db_bind_text(&ins, ":hash", blob_str(&hash));
      db_bind_int(&ins, ":sz", blob_size(&file));
      if( blob_size(&compressed) <= 0.8*blob_size(&file) ){
        db_bind_int(&ins, ":encoding", 1);
        db_bind_blob(&ins, ":content", &compressed);
      }else{
        db_bind_int(&ins, ":encoding", 0);
        db_bind_blob(&ins, ":content", &file);
      }
      db_step(&ins);
      db_reset(&ins);
      blob_reset(&compressed);
      blob_reset(&hash);
      blob_reset(&file);
    }
    db_finalize(&ins);
    db_unset("uv-hash", 0);
    db_end_transaction(0);
  }else if( memcmp(zCmd, "cat", nCmd)==0 ){
    int i;
    verify_all_options();
    db_begin_transaction();
    for(i=3; i<g.argc; i++){
      Blob content;
      if( unversioned_content(g.argv[i], &content)==0 ){

        blob_write_to_file(&content, "-");

      }


      blob_reset(&content);
    }
    db_end_transaction(0);
  }else if( memcmp(zCmd, "export", nCmd)==0 ){
    Blob content;
    verify_all_options();
    if( g.argc!=5 ) usage("export UVFILE OUTPUT");


    if( unversioned_content(g.argv[3], &content) ){
      fossil_fatal("no such uv-file: %Q", g.argv[3]);
    }

    blob_write_to_file(&content, g.argv[4]);
    blob_reset(&content);
  }else if( memcmp(zCmd, "hash", nCmd)==0 ){  /* undocumented */
    /* Show the hash value used during uv sync */
    int debugFlag = find_option("debug",0,0)!=0;
    fossil_print("%s\n", unversioned_content_hash(debugFlag));
  }else if( memcmp(zCmd, "list", nCmd)==0 || memcmp(zCmd, "ls", nCmd)==0 ){

    }
    db_unset("uv-hash", 0);
    db_end_transaction(0);
  }else{
    usage("add|cat|export|ls|revert|rm|sync");
  }
}

  rid = content_put_ex(&content, blob_str(&pXfer->aToken[1]), srcid,
                       szC, isPriv);
  Th_AppendToList(pzUuidList, pnUuidList, blob_str(&pXfer->aToken[1]),
                  blob_size(&pXfer->aToken[1]));
  remote_has(rid);
  blob_reset(&content);
}

/*
** The aToken[0..nToken-1] blob array is a parse of a "uvfile" line
** message.  This routine finishes parsing that message and adds the
** unversioned file to the "unversioned" table.
**
** The file line is in one of the following two forms:
**
**      uvfile NAME MTIME HASH SIZE FLAGS
**      uvfile NAME MTIME HASH SIZE FLAGS \n CONTENT
**
** If the 0x0001 bit of FLAGS is set, that means the file has been 
** deleted, SIZE is zero, the HASH is "0", and the "\n CONTENT" is omitted.
**
** SIZE is the number of bytes of CONTENT.  The CONTENT is uncompressed.
** HASH is the SHA1 hash of CONTENT.
**
** If the 0x0004 bit of FLAGS is set, that means the CONTENT size
** is too big to transmit and so the "\n CONTENT" is omitted.
*/
static void xfer_accept_unversioned_file(Xfer *pXfer, int isWriter){
  sqlite3_int64 mtime;      /* The MTIME */
  Blob *pHash;              /* The HASH value */
  int sz;                   /* The SIZE */
  int flags;                /* The FLAGS */
  Blob content;             /* The CONTENT */
  Blob hash;                /* Hash computed from CONTENT to compare with HASH */
  Stmt q;                   /* SQL statements for comparison and insert */
  int isDelete;             /* HASH is "0" indicating this is a delete operation */
  int nullContent;          /* True of CONTENT is NULL */

  pHash = &pXfer->aToken[3];
  if( pXfer->nToken==5
   || !blob_is_filename(&pXfer->aToken[1])
   || !blob_is_int64(&pXfer->aToken[2], &mtime)
   || (blob_eq(pHash,"0")!=0 && !blob_is_uuid(pHash))
   || !blob_is_int(&pXfer->aToken[4], &sz)
   || !blob_is_int(&pXfer->aToken[5], &flags)
  ){
    blob_appendf(&pXfer->err, "malformed uvfile line");
    return;
  }
  blob_init(&content, 0, 0);
  blob_init(&hash, 0, 0);
  if( sz>0 && (flags & 0x0005)==0 ){
    blob_extract(pXfer->pIn, sz, &content);
    nullContent = 0;
    sha1sum_blob(&content, &hash);
    if( blob_compare(&hash, pHash)!=0 ){
      blob_appendf(&pXfer->err, "in uvfile line, HASH does not match CONTENT");
      goto end_accept_unversioned_file;
    }
  }else{
    nullContent = 1;
  }

  /* The isWriter flag must be true in order to land the new file */
  if( !isWriter ) goto end_accept_unversioned_file;

  /* Check to see if current content really should be overwritten.  Ideally,
  ** a uvfile card should never have been sent unless the overwrite should
  ** occur.  But do not trust the sender.  Double-check. 
  */
  db_prepare(&q,
    "SELECT mtime, hash FROM unversioned WHERE name=%Q",
    blob_str(&pXfer->aToken[1])
  );
  if( db_step(&q)==SQLITE_ROW ){
    sqlite3_int64 xtime = db_column_int64(&q, 0);
    const char *xhash = db_column_text(&q, 1);
    if( xtime>mtime ){
      db_finalize(&q);
      goto end_accept_unversioned_file;
    }
    if( xhash==0 ) xhash = "0";
    if( xtime==mtime && strcmp(xhash, blob_str(pHash))>0 ){
      db_finalize(&q);
      goto end_accept_unversioned_file;
    }
  }
  db_finalize(&q);
  
  /* Store the content */
  isDelete = blob_eq(pHash, "0");
  if( isDelete ){
    db_prepare(&q,
      "UPDATE unversioned"
      "   SET rcvid=:rcvid, mtime=:mtime, hash=NULL, sz=0, content=NULL"
      " WHERE name=:name"
    );
  }else{
    db_prepare(&q,
      "REPLACE INTO unversioned(name, rcvid, mtime, hash, sz, content)"
      " VALUES(:name,:rcvid,:mtime,:hash,:sz,:content)"
    );
  }
  db_bind_text(&q, ":name", blob_str(&pXfer->aToken[1]));
  db_bind_int(&q, ":rcvid", g.rcvid);
  db_bind_int64(&q, ":mtime", mtime);
  db_bind_text(&q, ":hash", blob_str(&pXfer->aToken[5]));
  db_bind_int(&q, ":sz", blob_size(&content));
  if( !nullContent ){
    blob_compress(&content, &content);
    db_bind_blob(&q, ":content", &content);
  }
  db_step(&q);
  db_finalize(&q);

end_accept_unversioned_file:
  blob_reset(&content);
  blob_reset(&hash);
}

/*
** Try to send a file as a delta against its parent.
** If successful, return the number of bytes in the delta.
** If we cannot generate an appropriate delta, then send
** nothing and return zero.
**

    }
    if( !isPrivate && srcIsPrivate ){
      blob_reset(&fullContent);
    }
  }
  db_reset(&q1);
}

/*
** Send the unversioned file identified by zName by generating the
** appropriate "uvfile" card.
**
**     uvfile NAME MTIME HASH SIZE FLAGS \n CONTENT
*/
static void send_unversioned_file(Xfer *pXfer, const char *zName){
  Stmt q1;

  db_static_prepare(&q1,
    "SELECT mtime, hash, encoding, content FROM unversioned WHERE name=%Q",
    zName
  );
  if( db_step(&q1)==SQLITE_ROW ){
    sqlite3_int64 mtime = db_column_int64(&q1, 0);
    const char *zHash = db_column_text(&q1, 1);
    blob_appendf(pXfer->pOut, "uvfile %s %lld", zName, mtime);
    if( zHash==0 ){
      blob_append(pXfer->pOut, " 0 0 1\n", -1);
    }else{
      Blob content;
      blob_init(&content, 0, 0);
      db_column_blob(&q1, 3, &content);
      if( db_column_int(&q1, 2) ){
        blob_uncompress(&content, &content);
      }
      blob_appendf(pXfer->pOut, " %s %d 0\n", zHash, blob_size(&content));
      blob_append(pXfer->pOut, blob_buffer(&content), blob_size(&content));
      if( blob_buffer(pXfer->pOut)[blob_size(pXfer->pOut)-1]!='\n' ){
        blob_append(pXfer->pOut, "\n", 1);
      }
      blob_reset(&content);
    }
  }
  db_finalize(&q1);
}

/*
** Send a gimme message for every phantom.
**
** Except: do not request shunned artifacts.  And do not request
** private artifacts if we are not doing a private transfer.
*/

    configure_render_special_name(zName, &content);
    blob_appendf(pXfer->pOut, "config %s %d\n%s\n", zName,
                 blob_size(&content), blob_str(&content));
    blob_reset(&content);
  }
}


/*
** pXfer is a "pragma uv-hash HASH" card.
**
** If HASH is different from the unversioned content hash on this server,
** then send a bunch of uvigot cards, one for each entry unversioned file
** on this server.
*/
static void send_unversioned_catalog(Xfer *pXfer){
  unversioned_schema();
  if( !blob_eq(&pXfer->aToken[2], unversioned_content_hash(0)) ){
    int nUvIgot = 0;
    Stmt uvq;
    db_prepare(&uvq,
       "SELECT name, mtime, hash, sz FROM unversioned"
    );
    while( db_step(&uvq)==SQLITE_ROW ){
      const char *zName = db_column_text(&uvq,0);
      sqlite3_int64 mtime = db_column_int64(&uvq,1);
      const char *zHash = db_column_text(&uvq,2);
      int sz = db_column_int(&uvq,3);
      nUvIgot++;
      if( zHash==0 ){ sz = 0; zHash = "0"; }
      blob_appendf(pXfer->pOut, "uvigot %s %lld %s %d\n", 
                   zName, mtime, zHash, sz);
    }
    db_finalize(&uvq);
  }
}

/*
** Called when there is an attempt to transfer private content to and
** from a server without authorization.
*/
static void server_private_xfer_not_authorized(void){
  @ error not\sauthorized\sto\ssync\sprivate\scontent
}

      if( blob_size(&xfer.err) ){
        cgi_reset_content();
        @ error %T(blob_str(&xfer.err))
        nErr++;
        break;
      }
    }else

    /*   uvfile NAME MTIME HASH SIZE FLAGS \n CONTENT
    **
    ** Accept an unversioned file from the client.
    */
    if( blob_eq(&xfer.aToken[0], "uvfile") ){
      xfer_accept_unversioned_file(&xfer, g.perm.Write);
      if( blob_size(&xfer.err) ){
          cgi_reset_content();
        @ error %T(blob_str(&xfer.err))
        nErr++;
        break;
      }
    }else

    /*   gimme UUID
    **
    ** Client is requesting a file.  Send it.
    */
    if( blob_eq(&xfer.aToken[0], "gimme")
     && xfer.nToken==2
     && blob_is_uuid(&xfer.aToken[1])
    ){
      nGimme++;
      if( isPull ){
        int rid = rid_from_uuid(&xfer.aToken[1], 0, 0);
        if( rid ){
          send_file(&xfer, rid, &xfer.aToken[1], deltaFlag);
        }
      }
    }else

    /*   uvgimme NAME
    **
    ** Client is requesting an unversioned file.  Send it.
    */
    if( blob_eq(&xfer.aToken[0], "uvgimme")
     && xfer.nToken==2
     && blob_is_filename(&xfer.aToken[1])
    ){
      send_unversioned_file(&xfer, blob_str(&xfer.aToken[1]));
    }else

    /*   igot UUID ?ISPRIVATE?
    **
    ** Client announces that it has a particular file.  If the ISPRIVATE
    ** argument exists and is non-zero, then the file is a private file.
    */
    if( xfer.nToken>=2

    /*    pragma NAME VALUE...
    **
    ** The client issue pragmas to try to influence the behavior of the
    ** server.  These are requests only.  Unknown pragmas are silently
    ** ignored.
    */
    if( blob_eq(&xfer.aToken[0], "pragma") && xfer.nToken>=2 ){

      /*   pragma send-private
      **
      ** If the user has the "x" privilege (which must be set explicitly -
      ** it is not automatic with "a" or "s") then this pragma causes
      ** private information to be pulled in addition to public records.
      */
      if( blob_eq(&xfer.aToken[1], "send-private") ){
        login_check_credentials();
        if( !g.perm.Private ){
          server_private_xfer_not_authorized();
        }else{
          xfer.syncPrivate = 1;
        }
      }

      /*   pragma send-catalog
      **
      ** Send igot cards for all known artifacts.
      */
      if( blob_eq(&xfer.aToken[1], "send-catalog") ){
        xfer.resync = 0x7fffffff;
      }

      /*   pragma uv-hash HASH
      **
      ** The client wants to make sure that unversioned files are all synced.
      ** If the HASH does not match, send a complete catalog of
      ** "uvigot" cards.
      */
      if( blob_eq(&xfer.aToken[1], "uv-hash") && blob_is_uuid(&xfer.aToken[2]) ){
        if( g.perm.Read && g.perm.Write ){
          @ pragma uv-push-ok
          send_unversioned_catalog(&xfer);
        }else if( g.perm.Read ){
          @ pragma uv-pull-only
          send_unversioned_catalog(&xfer);
        }
      }
    }else

    /* Unknown message
    */
    {
      cgi_reset_content();
      @ error bad\scommand:\s%F(blob_str(&xfer.line))

static const char zBriefFormat[] =
   "Round-trips: %d   Artifacts sent: %d  received: %d\r";

#if INTERFACE
/*
** Flag options for controlling client_sync()
*/
#define SYNC_PUSH           0x0001
#define SYNC_PULL           0x0002
#define SYNC_CLONE          0x0004
#define SYNC_PRIVATE        0x0008
#define SYNC_VERBOSE        0x0010
#define SYNC_RESYNC         0x0020
#define SYNC_UNVERSIONED    0x0040
#endif

/*
** Floating-point absolute value
*/
static double fossil_fabs(double x){
  return x>0.0 ? x : -x;

  unsigned configRcvMask, /* Receive these configuration items */
  unsigned configSendMask /* Send these configuration items */
){
  int go = 1;             /* Loop until zero */
  int nCardSent = 0;      /* Number of cards sent */
  int nCardRcvd = 0;      /* Number of cards received */
  int nCycle = 0;         /* Number of round trips to the server */
  int size;               /* Size of a config value or uvfile */
  int origConfigRcvMask;  /* Original value of configRcvMask */
  int nFileRecv;          /* Number of files received */
  int mxPhantomReq = 200; /* Max number of phantoms to request per comm */
  const char *zCookie;    /* Server cookie */
  i64 nSent, nRcvd;       /* Bytes sent and received (after compression) */
  int cloneSeqno = 1;     /* Sequence number for clones */
  Blob send;              /* Text we are sending to the server */
  Blob recv;              /* Reply we got back from the server */
  Xfer xfer;              /* Transfer data */
  int pctDone;            /* Percentage done with a message */
  int lastPctDone = -1;   /* Last displayed pctDone */
  double rArrivalTime;    /* Time at which a message arrived */
  const char *zSCode = db_get("server-code", "x");
  const char *zPCode = db_get("project-code", 0);
  int nErr = 0;           /* Number of errors */
  int nRoundtrip= 0;      /* Number of HTTP requests */
  int nArtifactSent = 0;  /* Total artifacts sent */
  int nArtifactRcvd = 0;  /* Total artifacts received */
  const char *zOpType = 0;/* Push, Pull, Sync, Clone */
  double rSkew = 0.0;     /* Maximum time skew */
  int uvHashSent = 0;     /* The "pragma uv-hash" message has been sent */
  int uvStatus = 0;       /* 0: no I/O.  1: pull-only  2: push-and-pull */
  int uvDoPush = 0;       /* If true, generate uvfile messages to send to server */
  sqlite3_int64 mtime;    /* Modification time on a UV file */

  if( db_get_boolean("dont-push", 0) ) syncFlags &= ~SYNC_PUSH;
  if( (syncFlags & (SYNC_PUSH|SYNC_PULL|SYNC_CLONE|SYNC_UNVERSIONED))==0
     && configRcvMask==0 && configSendMask==0 ) return 0;

  transport_stats(0, 0, 1);
  socket_global_init();
  memset(&xfer, 0, sizeof(xfer));
  xfer.pIn = &recv;
  xfer.pOut = &send;

  origConfigRcvMask = 0;


  /* Send the send-private pragma if we are trying to sync private data */
  if( syncFlags & SYNC_PRIVATE ){
    blob_append(&send, "pragma send-private\n", -1);
  }

  /* When syncing unversioned files, create a TEMP table in which to store
  ** the names of files that do not need to be sent from client to server.
  */
  if( syncFlags & SYNC_UNVERSIONED ){
    db_multi_exec("CREATE TEMP TABLE uv_dont_push(name TEXT PRIMARY KEY)WITHOUT ROWID;");
  }

  /*
  ** Always begin with a clone, pull, or push message
  */
  if( syncFlags & SYNC_CLONE ){
    blob_appendf(&send, "clone 3 %d\n", cloneSeqno);
    syncFlags &= ~(SYNC_PUSH|SYNC_PULL);

    db_begin_transaction();
    db_record_repository_filename(0);
    db_multi_exec(
      "CREATE TEMP TABLE onremote(rid INTEGER PRIMARY KEY);"
    );
    manifest_crosslink_begin();

    /* Send back the most recently received cookie.  Let the server
    ** figure out if this is a cookie that it cares about.
    */
    zCookie = db_get("cookie", 0);
    if( zCookie ){
      blob_appendf(&send, "cookie %s\n", zCookie);
    }

      ){
        int overwrite = (configRcvMask & CONFIGSET_OVERWRITE)!=0;
        configure_prepare_to_receive(overwrite);
      }
      origConfigRcvMask = configRcvMask;
      configRcvMask = 0;
    }

    /* Send a request to sync unversioned files.  On a clone, delay sending
    ** this until the second cycle since the login card might fail on
    ** the first cycle.
    */
    if( (syncFlags & SYNC_UNVERSIONED)!=0
     && ((syncFlags & SYNC_CLONE)==0 || nCycle>0)
     && !uvHashSent
    ){
      blob_appendf(&send, "pragma uv-hash %s\n", unversioned_content_hash(0));
      nCardSent++;
      uvHashSent = 1;
    }

    /* Send configuration parameters being pushed */
    if( configSendMask ){
      if( zOpType==0 ) zOpType = "Push";
      if( configSendMask & CONFIGSET_OLDFORMAT ){
        const char *zName;
        zName = configure_first_name(configSendMask);
        while( zName ){
          send_legacy_config_card(&xfer, zName);
          zName = configure_next_name(configSendMask);
          nCardSent++;
        }
      }else{
        nCardSent += configure_send_group(xfer.pOut, configSendMask, 0);
      }
      configSendMask = 0;
    }

    /* Send unversioned files present here on the client but missing or
    ** obsolete on the server.
    */
    if( uvDoPush ){
      Stmt uvq;
      assert( (syncFlags & SYNC_UNVERSIONED)!=0 );
      assert( uvStatus==2 );
      db_prepare(&uvq,
        "SELECT name FROM unversioned"
        " WHERE hash IS NOT NULL"
        " EXCEPT "
        "SELECT name FROM uv_dont_send"
      );
      while( db_step(&uvq) ){
        send_unversioned_file(&xfer, db_column_text(&uvq,0));
      }
      db_finalize(&uvq);
      uvDoPush = 0;
    }

    /* Append randomness to the end of the message.  This makes all
    ** messages unique so that that the login-card nonce will always
    ** be unique.
    */
    zRandomness = db_text(0, "SELECT hex(randomblob(20))");
    blob_appendf(&send, "# %s\n", zRandomness);

      **
      ** Receive a compressed file transmitted from the server.
      */
      if( blob_eq(&xfer.aToken[0],"cfile") ){
        xfer_accept_compressed_file(&xfer, 0, 0);
        nArtifactRcvd++;
      }else

      /*   uvfile NAME MTIME HASH SIZE FLAGS \n CONTENT
      **
      ** Accept an unversioned file from the client.
      */
      if( blob_eq(&xfer.aToken[0], "uvfile") ){
        xfer_accept_unversioned_file(&xfer, 1);
      }else

      /*   gimme UUID
      **
      ** Server is requesting a file.  If the file is a manifest, assume
      ** that the server will also want to know all of the content files
      ** associated with the manifest and send those too.
      */

        }else if( (syncFlags & (SYNC_PULL|SYNC_CLONE))!=0 ){
          rid = content_new(blob_str(&xfer.aToken[1]), isPriv);
          if( rid ) newPhantom = 1;
        }
        remote_has(rid);
      }else

      /*   uvigot NAME TIMESTAMP HASH SIZE
      **
      ** Server announces that it has a particular unversioned file.  The
      ** server will only send this card if the client had previously sent
      ** a "pragma uv-hash" card with a hash that does not match.
      **
      ** If the identified file needs to be transferred, then do the
      ** transfer.
      */
      if( xfer.nToken==5
       && blob_eq(&xfer.aToken[0], "uvigot")
       && blob_is_filename(&xfer.aToken[1])
       && blob_is_int64(&xfer.aToken[2], &mtime)
       && blob_is_int(&xfer.aToken[4], &size)
       && (size==0 || blob_is_uuid(&xfer.aToken[3]))
      ){
        if( uvStatus==0 ) uvStatus = 2;
      }else

      /*   push  SERVERCODE  PRODUCTCODE
      **
      ** Should only happen in response to a clone.  This message tells
      ** the client what product to use for the new database.
      */
      if( blob_eq(&xfer.aToken[0],"push")

      /*    pragma NAME VALUE...
      **
      ** The server can send pragmas to try to convey meta-information to
      ** the client.  These are informational only.  Unknown pragmas are
      ** silently ignored.
      */
      if( blob_eq(&xfer.aToken[0], "pragma") && xfer.nToken>=2 ){
        /* If the server is unwill to accept new unversioned content (because
        ** this client lacks the necessary permissions) then it sends a
        ** "uv-pull-only" pragma so that the client will know not to waste
        ** bandwidth trying to upload unversioned content.  If the server
        ** does accept new unversioned content, it sends "uv-push-ok".
        */
        if( blob_eq(&xfer.aToken[1], "uv-pull-only") ){
          uvStatus = 1;
        }else if( blob_eq(&xfer.aToken[1], "uv-push-ok") ){
          uvStatus = 2;
        }
      }else

      /*   error MESSAGE
      **
      ** Report an error and abandon the sync session.
      **
      ** Except, when cloning we will sometimes get an error on the

    xfer.nFileRcvd = 0;
    xfer.nDeltaRcvd = 0;
    xfer.nDanglingFile = 0;

    /* If we have one or more files queued to send, then go
    ** another round
    */
    if( xfer.nFileSent+xfer.nDeltaSent>0 || uvDoPush ){
      go = 1;
    }

    /* If this is a clone, the go at least two rounds */
    if( (syncFlags & SYNC_CLONE)!=0 && nCycle==1 ) go = 1;

    /* Stop the cycle if the server sends a "clone_seqno 0" card and