struct stat sStat;
    Blob dir;
    char *zDir;

    file_canonical_name(zRepo, &dir);
    zDir = blob_str(&dir);
    if( file_isdir(zDir)==1 ){
      if( chdir(zDir) || chroot(zDir) || chdir("/") ){
        fossil_fatal("unable to chroot into %s", zDir);
      }
      zRepo = "/";
    }else{
      for(i=strlen(zDir)-1; i>0 && zDir[i]!='/'; i--){}
      if( zDir[i]!='/' ) fossil_panic("bad repository name: %s", zRepo);
      zDir[i] = 0;
      if( chdir(zDir) || chroot(zDir) || chdir("/") ){
        fossil_fatal("unable to chroot into %s", zDir);
      }
      zDir[i] = '/';
      zRepo = &zDir[i];
    }
    if( stat(zRepo, &sStat)!=0 ){
      fossil_fatal("cannot stat() repository: %s", zRepo);
    }
    setgid(sStat.st_gid);