Fossil

  int nPrepare;             /* Number of calls to sqlite3_prepare() */
  int nDeleteOnFail;        /* Number of entries in azDeleteOnFail[] */
  struct sCommitHook {
    int (*xHook)(void);         /* Functions to call at db_end_transaction() */
    int sequence;               /* Call functions in sequence order */
  } aHook[5];
  char *azDeleteOnFail[3];  /* Files to delete on a failure */
  char *azBeforeCommit[5];  /* Commands to run prior to COMMIT */
  int nBeforeCommit;        /* Number of entries in azBeforeCommit */
  int nPriorChanges;        /* sqlite3_total_changes() at transaction start */
} db = {0, 0, 0, 0, 0, 0, };

/*
** Arrange for the given file to be deleted on a failure.
*/
void db_delete_on_failure(const char *zFilename){
  assert( db.nDeleteOnFail<count(db.azDeleteOnFail) );

/*
** Begin and end a nested transaction
*/
void db_begin_transaction(void){
  if( db.nBegin==0 ){
    db_multi_exec("BEGIN");
    sqlite3_commit_hook(g.db, db_verify_at_commit, 0);
    db.nPriorChanges = sqlite3_total_changes(g.db);
  }
  db.nBegin++;
}
void db_end_transaction(int rollbackFlag){
  if( g.db==0 ) return;
  if( db.nBegin<=0 ) return;
  if( rollbackFlag ) db.doRollback = 1;
  db.nBegin--;
  if( db.nBegin==0 ){
    int i;
    if( db.doRollback==0 && db.nPriorChanges<sqlite3_total_changes(g.db) ){
      while( db.nBeforeCommit ){
        db.nBeforeCommit--;
        sqlite3_exec(g.db, db.azBeforeCommit[db.nBeforeCommit], 0, 0, 0);
        sqlite3_free(db.azBeforeCommit[db.nBeforeCommit]);
      }
    if( db.doRollback==0 ) leaf_do_pending_checks();
      leaf_do_pending_checks();
    }
    for(i=0; db.doRollback==0 && i<db.nCommitHook; i++){
      db.doRollback |= db.aHook[i].xHook();
    }
    while( db.pAllStmt ){
      db_finalize(db.pAllStmt);
    }
    db_multi_exec(db.doRollback ? "ROLLBACK" : "COMMIT");

  rc = sqlite3_exec(g.db, blob_buffer(&sql), 0, 0, &zErr);
  if( rc!=SQLITE_OK ){
    db_err("%s\n%s", zErr, blob_buffer(&sql));
  }
  blob_reset(&sql);
  return rc;
}

/*
** Optionally make the following changes to the database if feasible and
** convenient.  Do not start a transaction for these changes, but only
** make these changes if other changes are also being made.
*/
void db_optional_sql(const char *zDb, const char *zSql, ...){
  if( db_is_writeable(zDb) && db.nBeforeCommit < count(db.azBeforeCommit) ){
    va_list ap;
    va_start(ap, zSql);
    db.azBeforeCommit[db.nBeforeCommit++] = sqlite3_vmprintf(zSql, ap);
    va_end(ap);
  }
}

/*
** Execute a query and return a single integer value.
*/
i64 db_int64(i64 iDflt, const char *zSql, ...){
  va_list ap;
  Stmt s;

** Return TRUE if the schema is out-of-date
*/
int db_schema_is_outofdate(void){
  return db_exists("SELECT 1 FROM config"
                   " WHERE name='aux-schema'"
                   "   AND value<>'%s'", AUX_SCHEMA);
}

/*
** Return true if the database is writeable
*/
int db_is_writeable(const char *zName){
  return !sqlite3_db_readonly(g.db, db_name(zName));
}

/*
** Verify that the repository schema is correct.  If it is not correct,
** issue a fatal error and die.
*/
void db_verify_schema(void){
  if( db_schema_is_outofdate() ){

/*
** Open the local database.  If unable, exit with an error.
*/
void db_must_be_within_tree(void){
  if( db_open_local()==0 ){
    fossil_fatal("not within an open checkout");
    fossil_fatal("current directory is not within an open checkout");
  }
  db_open_repository(0);
  db_verify_schema();
}

/*
** Close the database connection.

    Blob localRoot;
    file_canonical_name(g.zLocalRoot, &localRoot, 1);
    db_multi_exec(
      "REPLACE INTO global_config(name, value)"
      "VALUES('ckout:%q','%q');",
      blob_str(&localRoot), blob_str(&full)
    );
    db_swap_connections();
    db_optional_sql("repository", 
        "REPLACE INTO config(name,value,mtime)"
        "VALUES('ckout:%q',1,now())",
        blob_str(&localRoot)
    );
    blob_reset(&localRoot);
  }
  db_swap_connections();
  }else{
    db_swap_connections();
  }
  blob_reset(&full);
}

/*
** COMMAND: open
**
** Usage: %fossil open FILENAME ?VERSION? ?OPTIONS?

    usage("REPOSITORY-FILENAME ?VERSION?");
  }
  if( !allowNested && db_open_local() ){
    fossil_panic("already within an open tree rooted at %s", g.zLocalRoot);
  }
  file_canonical_name(g.argv[2], &path, 0);
  db_open_repository(blob_str(&path));
#if defined(_WIN32)
# define LOCALDB_NAME "./_FOSSIL_"
#else
# define LOCALDB_NAME "./.fslckout"
#endif
  db_init_database("./_FOSSIL_", zLocalSchema, (char*)0);
  db_delete_on_failure("./_FOSSIL_");
  db_init_database(LOCALDB_NAME, zLocalSchema, (char*)0);
  db_delete_on_failure(LOCALDB_NAME);
  db_open_local();
  db_lset("repository", g.argv[2]);
  db_record_repository_filename(blob_str(&path));
  vid = db_int(0, "SELECT pid FROM plink y"
                  " WHERE NOT EXISTS(SELECT 1 FROM plink x WHERE x.cid=y.pid)");
  if( vid==0 ){
    db_lset_int("checkout", 1);

  char const *def;      /* Default value */
};
#endif /* INTERFACE */
struct stControlSettings const ctrlSettings[] = {
  { "access-log",    0,                0, 0, "off"                 },
  { "allow-symlinks",0,                0, 1, "off"                 },
  { "auto-captcha",  "autocaptcha",    0, 0, "on"                  },
  { "auto-hyperlink",0,                0, 0, "on",                 },
  { "auto-shun",     0,                0, 0, "on"                  },
  { "autosync",      0,                0, 0, "on"                  },
  { "binary-glob",   0,               32, 1, ""                    },
  { "clearsign",     0,                0, 0, "off"                 },
  { "case-sensitive",0,                0, 0, "on"                  },
  { "crnl-glob",     0,               16, 1, ""                    },
  { "default-perms", 0,               16, 0, "u"                   },

**                     (existing links in repository created on Unix become 
**                     plain-text files with link destination path inside).
**                     Default: off
**
**    auto-captcha     If enabled, the Login page provides a button to
**                     fill in the captcha password.  Default: on
**
**    auto-hyperlink   Use javascript to enable hyperlinks on web pages
**                     for all users (regardless of the "h" privilege) if the
**                     User-Agent string in the HTTP header look like it came
**                     from real person, not a spider or bot.  Default: on
**
**    auto-shun        If enabled, automatically pull the shunning list
**                     from a server to which the client autosyncs.
**                     Default: on
**
**    autosync         If enabled, automatically pull prior to commit
**                     or update and automatically push after commit or
**                     tag or branch creation.  If the value is "pullonly"