Fossil

**
** If VFILE.DELETED is null or if VFILE.RID is zero, then we can assume
** the file has changed without having the check the on-disk image.
*/
void vfile_check_signature(int vid){
  Stmt q;
  Blob fileCksum, origCksum;
  int checkMtime = db_get_boolean("mtime-changes", 0);

  db_begin_transaction();
  db_prepare(&q, "SELECT id, %Q || pathname,"
                 "       vfile.mrid, deleted, chnged, uuid, mtime"
                 "  FROM vfile LEFT JOIN blob ON vfile.mrid=blob.rid"
                 " WHERE vid=%d ", g.zLocalRoot, vid);
  while( db_step(&q)==SQLITE_ROW ){
    int id, rid, isDeleted;
    const char *zName;
    int chnged = 0;
    int oldChnged;
    i64 oldMtime;
    i64 currentMtime;

    id = db_column_int(&q, 0);
    zName = db_column_text(&q, 1);
    rid = db_column_int(&q, 2);
    isDeleted = db_column_int(&q, 3);
    oldChnged = db_column_int(&q, 4);
    oldMtime = db_column_int64(&q, 6);
    if( oldChnged>=2 ){
      chnged = oldChnged;
    }else if( isDeleted || rid==0 ){
      chnged = 1;
    }
    if( chnged!=1 ){
      currentMtime = file_mtime(zName);
    }
    if( chnged!=1 && (checkMtime==0 || currentMtime!=oldMtime) ){
      db_ephemeral_blob(&q, 5, &origCksum);
      if( sha1sum_file(zName, &fileCksum) ){
        blob_zero(&fileCksum);
      }
      if( blob_compare(&fileCksum, &origCksum) ){
        chnged = 1;
      }else if( currentMtime!=oldMtime ){
        db_multi_exec("UPDATE vfile SET mtime=%lld WHERE id=%d",
                      currentMtime, id);
      }
      blob_reset(&origCksum);
      blob_reset(&fileCksum);
    }
    if( chnged!=oldChnged ){
      db_multi_exec("UPDATE vfile SET chnged=%d WHERE id=%d", chnged, id);
    }

    id = db_column_int(&q, 0);
    zName = db_column_text(&q, 1);
    rid = db_column_int(&q, 2);
    content_get(rid, &content);
    if( verbose ) printf("%s\n", &zName[nRepos]);
    blob_write_to_file(&content, zName);
    db_multi_exec("UPDATE vfile SET mtime=%lld WHERE id=%d",
                  file_mtime(zName), id);
  }
  db_finalize(&q);
}


/*
** Delete from the disk every file in VFILE vid.
*/
void vfile_unlink(int vid){
  Stmt q;
  db_prepare(&q, "SELECT %Q || pathname FROM vfile"
                 " WHERE vid=%d AND mrid>0", g.zLocalRoot, vid);
  while( db_step(&q)==SQLITE_ROW ){
    const char *zName;

    zName = db_column_text(&q, 0);
    unlink(zName);
  }
  db_finalize(&q);
  db_multi_exec("UPDATE vfile SET mtime=NULL HERE vid=%d AND mrid>0", vid);
}

/*
** Load into table SFILE the name of every ordinary file in
** the directory pPath.   Omit the first nPrefix characters of
** of pPath when inserting into the SFILE table.
**