Fossil

    fwrite(zBuf, 1, got, out);
  }
  fclose(in);
  fclose(out);
}

/*
** Set or clear the execute bit on a file.  Return true if a change
** occurred and false if this routine is a no-op.
*/
int file_setexe(const char *zFilename, int onoff){
  int rc = 0;
#if !defined(_WIN32)
  struct stat buf;
  if( stat(zFilename, &buf)!=0 ) return 0;
  if( onoff ){
    if( (buf.st_mode & 0111)!=0111 ){
      chmod(zFilename, buf.st_mode | 0111);
      rc = 1;
    }
  }else{
    if( (buf.st_mode & 0111)!=0 ){
      chmod(zFilename, buf.st_mode & ~0111);
      rc = 1;
    }
  }
#endif /* _WIN32 */
  return rc;
}

/*
** Create the directory named in the argument, if it does not already
** exist.  If forceFlag is 1, delete any prior non-directory object 
** with the same name.
**

** true the redo a change.  If there is nothing to undo (or redo) then
** this routine is a noop.
*/
static void undo_one(const char *zPathname, int redoFlag){
  Stmt q;
  char *zFullname;
  db_prepare(&q,
    "SELECT content, existsflag, isExe FROM undo"
    " WHERE pathname=%Q AND redoflag=%d",
     zPathname, redoFlag
  );
  if( db_step(&q)==SQLITE_ROW ){
    int old_exists;
    int new_exists;
    int old_exe;
    int new_exe;
    Blob current;
    Blob new;
    zFullname = mprintf("%s/%s", g.zLocalRoot, zPathname);
    new_exists = file_size(zFullname)>=0;
    if( new_exists ){
      blob_read_from_file(&current, zFullname);
      new_exe = file_isexe(zFullname);
    }else{
      blob_zero(&current);
      new_exe = 0;
    }
    blob_zero(&new);
    old_exists = db_column_int(&q, 1);
    old_exe = db_column_int(&q, 2);
    if( old_exists ){
      db_ephemeral_blob(&q, 0, &new);
    }
    if( old_exists ){
      if( new_exists ){
        printf("%s %s\n", redoFlag ? "REDO" : "UNDO", zPathname);
      }else{
        printf("NEW %s\n", zPathname);
      }
      blob_write_to_file(&new, zFullname);
      file_setexe(zFullname, old_exe);
    }else{
      printf("DELETE %s\n", zPathname);
      unlink(zFullname);
    }
    blob_reset(&new);
    free(zFullname);
    db_finalize(&q);
    db_prepare(&q, 
       "UPDATE undo SET content=:c, existsflag=%d, isExe=%d,"
             " redoflag=NOT redoflag"
       " WHERE pathname=%Q",
       new_exists, new_exe, zPathname
    );
    if( new_exists ){
      db_bind_blob(&q, ":c", &current);
    }
    db_step(&q);
    blob_reset(&current);
  }

  int cid;
  const char *zDb = db_name("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
    @   isExe BOOLEAN,                    -- True if the file is executable
    @   content BLOB                      -- Saved content
    @ );
    @ CREATE TABLE %s.undo_vfile AS SELECT * FROM vfile;
    @ CREATE TABLE %s.undo_vmerge AS SELECT * FROM vmerge;
  ;
  if( undoDisable ) return;
  undo_reset();

  int existsFlag;
  Stmt q;

  if( !undoActive ) return;
  zFullname = mprintf("%s%s", g.zLocalRoot, zPathname);
  existsFlag = file_size(zFullname)>=0;
  db_prepare(&q,
    "INSERT OR IGNORE INTO undo(pathname,redoflag,existsflag,isExe,content)"
    " VALUES(%Q,0,%d,%d,:c)",
    zPathname, existsFlag, file_isexe(zFullname)
  );
  if( existsFlag ){
    blob_read_from_file(&content, zFullname);
    db_bind_blob(&q, ":c", &content);
  }
  free(zFullname);
  db_step(&q);

  while( db_step(&q)==SQLITE_ROW ){
    int isExe = 0;
    zFile = db_column_text(&q, 0);
    errCode = historical_version_of_file(zRevision, zFile, &record, &isExe,2);
    if( errCode==2 ){
      fossil_warning("file not in repository: %s", zFile);
    }else{
      sqlite3_int64 mtime;
      char *zFull = mprintf("%/%/", g.zLocalRoot, zFile);
      undo_save(zFile);
      blob_write_to_file(&record, zFull);
      file_setexe(zFull, isExe);
      printf("REVERTED: %s\n", zFile);

      mtime = file_mtime(zFull);
      db_multi_exec(
         "UPDATE vfile"
         "   SET mtime=%lld, chnged=0, deleted=0, isexe=%d,"
         "       pathname=coalesce(origname,pathname), origname=NULL"     
         " WHERE pathname=%Q",
         mtime, isExe, zFile
      );

      free(zFull);
    }
    blob_reset(&record);
  }
  db_finalize(&q);
  undo_finish();
  db_end_transaction(0);

  ManifestFile *pFile;

  db_begin_transaction();
  p = manifest_get(vid, CFTYPE_MANIFEST);
  if( p==0 ) return;
  db_multi_exec("DELETE FROM vfile WHERE vid=%d", vid);
  db_prepare(&ins,
    "INSERT INTO vfile(vid,isexe,rid,mrid,pathname) "
    " VALUES(:vid,:isexe,:id,:id,:name)");
  db_bind_int(&ins, ":vid", vid);
  manifest_file_rewind(p);
  while( (pFile = manifest_file_next(p,0))!=0 ){
    if( pFile->zUuid==0 || uuid_is_shunned(pFile->zUuid) ) continue;
    rid = uuid_to_rid(pFile->zUuid, 0);
    if( rid==0 || content_size(rid, -1)<0 ){
      fossil_warning("content missing for %s", pFile->zName);
      continue;
    }
    db_bind_int(&ins, ":isexe", manifest_file_mperm(pFile));
    db_bind_int(&ins, ":id", rid);
    db_bind_text(&ins, ":name", pFile->zName);
    db_step(&ins);
    db_reset(&ins);
  }
  db_finalize(&ins);
  manifest_destroy(p);

  int promptFlag         /* Prompt user to confirm overwrites */
){
  Stmt q;
  Blob content;
  int nRepos = strlen(g.zLocalRoot);

  if( vid>0 && id==0 ){
    db_prepare(&q, "SELECT id, %Q || pathname, mrid, isexe"
                   "  FROM vfile"
                   " WHERE vid=%d AND mrid>0",
                   g.zLocalRoot, vid);
  }else{
    assert( vid==0 && id>0 );
    db_prepare(&q, "SELECT id, %Q || pathname, mrid, isexe"
                   "  FROM vfile"
                   " WHERE id=%d AND mrid>0",
                   g.zLocalRoot, id);
  }
  while( db_step(&q)==SQLITE_ROW ){
    int id, rid, isExe;
    const char *zName;

    id = db_column_int(&q, 0);
    zName = db_column_text(&q, 1);
    rid = db_column_int(&q, 2);
    isExe = db_column_int(&q, 3);
    content_get(rid, &content);
    if( file_is_the_same(&content, zName) ){
      blob_reset(&content);
      if( file_setexe(zName, isExe) ){
        db_multi_exec("UPDATE vfile SET mtime=%lld WHERE id=%d",
                      file_mtime(zName), id);
      }
      continue;
    }
    if( promptFlag && file_size(zName)>=0 ){
      Blob ans;
      char *zMsg;
      char cReply;
      zMsg = mprintf("overwrite %s (a=always/y/N)? ", zName);

      if( cReply=='n' || cReply=='N' ){
        blob_reset(&content);
        continue;
      }
    }
    if( verbose ) printf("%s\n", &zName[nRepos]);
    blob_write_to_file(&content, zName);
    file_setexe(zName, isExe);
    blob_reset(&content);
    db_multi_exec("UPDATE vfile SET mtime=%lld WHERE id=%d",
                  file_mtime(zName), id);
  }
  db_finalize(&q);
}