Public bug reported: Binary package hint: zsync
Ubuntu 9.10 i386, zsync 0.6 DESCRIPTION zsync doesn't check if the downloaded file is zsync metafile. The whole metafile is downloaded and after that it is parsed. In normal situation, metafile is small but unexperienced user can call zsync with wrong file (like DVD/CD image) and in this case it is a problem as zsync dowloads hundred of megabytes to find that all data are useless... DEMO try this: $ zsync http://cdimage.ubuntu.com/daily/current/lucid-alternate-i386.iso zsync downloaded about 650MB of data to find that unexperienced user called it with wrong URL (URL of ISO file was entered, not URL of ZSYNC file). 650MB of data was downloaded to be useless... Correct command is this one (small change in URL only...): $ zsync http://cdimage.ubuntu.com/daily/current/lucid-alternate-i386.iso.zsync Smart (user friendly) zsync knows that most metadata files are small and that it can check header if the file at command line is really zsync file. From my point of view, zsync should download about 1kB (or 10kB, etc) of the file first, check header and continue with download only in the case that file is OK (is at roght version, etc). zsync file has fixed structure, it should be easy to parse header to check if file is zsync metadata file. Example of zsync metafile (http://cdimage.ubuntu.com/daily/current /lucid-alternate-i386.iso.zsync), header: zsync: 0.5 Filename: lucid-alternate-i386.iso Blocksize: 4096 Length: 673048576 Hash-Lengths: 2,3,5 URL: lucid-alternate-i386.iso SHA-1: 9fd2e7fa32bdfcf3aebcb5e642db34cc99a825cd @@@@@@@@@@@@@@@@ BINARY DATA ARE HERE @@@@@@@@@@@@@@@@@ ** Affects: zsync (Ubuntu) Importance: Undecided Status: New -- zsync doesn't check metafile during download https://bugs.launchpad.net/bugs/538717 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
