** zDbName is the name of a database file.  If no other database
** file is open, then open this one.  If another database file is
** already open, then attach zDbName using the name zLabel.
*/
static void db_open_or_attach(const char *zDbName, const char *zLabel){
  if( !g.db ){
    g.db = openDatabase(zDbName);
    g.zMainDbType = zLabel;
    db_connection_init();
  }else{
#if defined(_WIN32)
    zDbName = sqlite3_win32_mbcs_to_utf8(zDbName);
#endif
    db_multi_exec("ATTACH DATABASE %Q AS %s", zDbName, zLabel);

  }
}

/*
** Open the user database in "~/.fossil".  Create the database anew if
** it does not already exist.
**

  sqlite3 *db;            /* The connection to the databases */
  sqlite3 *dbConfig;      /* Separate connection for global_config table */
  int useAttach;          /* True if global_config is attached to repository */
  int configOpen;         /* True if the config database is open */
  long long int now;      /* Seconds since 1970 */
  int repositoryOpen;     /* True if the main repository database is open */
  char *zRepositoryName;  /* Name of the repository database */
  const char *zMainDbType;/* "configdb", "localdb", or "repository" */
  const char *zHome;      /* Name of user home directory */
  int localOpen;          /* True if the local database is open */
  char *zLocalRoot;       /* The directory holding the  local database */
  int minPrefix;          /* Number of digits needed for a distinct UUID */
  int fSqlTrace;          /* True if -sqltrace flag is present */
  int fSqlPrint;          /* True if -sqlprint flag is present */
  int fQuiet;             /* True if -quiet flag is present */

**
** Show statistics and global information about the repository.
*/
void stat_page(void){
  i64 t, fsize;
  int n, m;
  int szMax, szAvg;
  const char *zDb;
  char zBuf[100];

  login_check_credentials();
  if( !g.okRead ){ login_needed(); return; }
  style_header("Repository Statistics");
  @ <table class="label-value">
  @ <tr><th>Repository&nbsp;Size:</th><td>

  @ <tr><th>Fossil&nbsp;Version:</th><td>
  @ %h(MANIFEST_DATE) %h(MANIFEST_VERSION) (%h(COMPILER_NAME))
  @ </td></tr>
  @ <tr><th>SQLite&nbsp;Version:</th><td>
  sqlite3_snprintf(sizeof(zBuf), zBuf, "%.19s [%.10s] (%s)",
                   SQLITE_SOURCE_ID, &SQLITE_SOURCE_ID[20], SQLITE_VERSION);
  zDb = "repository";
  if( strcmp(g.zMainDbType, zDb)==0 ) zDb = "main";
  @ %s(zBuf)
  @ </td></tr>
  @ <tr><th>Database&nbsp;Stats:</th><td>
  @ %d(db_int(0, "PRAGMA %s.page_count", zDb)) pages,
  @ %d(db_int(0, "PRAGMA %s.page_size", zDb)) bytes/page,
  @ %d(db_int(0, "PRAGMA %s.freelist_count", zDb)) free pages,
  @ %s(db_text(0, "PRAGMA %s.encoding", zDb)),
  @ %s(db_text(0, "PRAGMA %s.journal_mode", zDb)) mode
  @ </td></tr>

  @ </table>
  style_footer();
}

static int undoActive = 0;

/*
** Begin capturing a snapshot that can be undone.
*/
void undo_begin(void){
  int cid;
  const char *zDb = "localdb";
  static const char zSql[] = 
    @ CREATE TABLE %s.undo(
    @   pathname TEXT UNIQUE,             -- Name of the file
    @   redoflag BOOLEAN,                 -- 0 for undoable.  1 for redoable
    @   existsflag BOOLEAN,               -- True if the file exists
    @   content BLOB                      -- Saved content
    @ );
    @ CREATE TABLE %s.undo_vfile AS SELECT * FROM vfile;
    @ CREATE TABLE %s.undo_vmerge AS SELECT * FROM vmerge;
    @ CREATE TABLE %s.undo_pending(undoId INTEGER PRIMARY KEY);
  ;
  undo_reset();
  if( strcmp(g.zMainDbType,zDb)==0 ) zDb = "main";
  db_multi_exec(zSql, zDb, zDb, zDb, zDb);
  cid = db_lget_int("checkout", 0);
  db_lset_int("undo_checkout", cid);
  db_lset_int("undo_available", 1);
  undoActive = 1;
}

/*