||<>|| == Notice == Jigdo is no longer used for the latest Ubuntu images. It has been replaced by zsync, which does much the same job. If you're interested in downloading daily ISO files for Ubuntu and keeping them up-to-date efficiently, refer to [[ZsyncCdImage]]. == Definition == Jigdo (JIGsaw-DOwnload) can be used to efficiently download daily alternate CD builds or update existing alternate .iso images without the need to re-download the entire CD image. It simply checks for differences or updates between an existing CD image (on your system) and the latest released image. == Installation == Install the required packages for Jigdo. {{{ sudo apt-get install jigdo-file }}} == Use & Example downloading Ubuntu 12.04 (Precise Pangolin) == Start the program from the terminal: {{{ jigdo-lite }}} === Supply the .jigdo file === The program then asks you for the URL to the .jigdo template you want to download. {{{ Jigsaw Download "lite" Copyright (C) 2001-2005 | jigdo@ Richard Atterer | atterer.net Getting mirror information from /etc/apt/sources.list ----------------------------------------------------------------- To resume a half-finished download, enter name of .jigdo file. To start a new download, enter URL of .jigdo file. You can also enter several URLs/filenames, separated with spaces, or enumerate in {}, e.g. `http://server/cd-{1_NONUS,2,3}.jigdo' jigdo: }}} In this situation we'll use [[http://cdimage.ubuntu.com/precise/daily/current/precise-alternate-i386.jigdo|Alternate install CD for PC (Intel x86) computers]] (copy link-location & paste into prompt above) === Supply previous CD image === Jigdo will then download a copy of the .jigdo file and prompt you for any previous images you have to base the download from. Here you can point Jigdo to an existing burned copy of the CD image, or loop-mounted ISO image (see MountIso). (eg. /media/cdrom or /media/cdimage) {{{ If you already have a previous version of the CD you are downloading, jigdo can re-use files on the old CD that are also present in the new image, and you do not need to download them again. Mount the old CD ROM and enter the path it is mounted under (e.g. `/mnt/cdrom'). Alternatively, just press enter if you want to start downloading the remaining files. }}} If you didn't burn the old image to a CD, you can loop-mount it (see MountIso) {{{ sudo mkdir /media/cdimage sudo mount -o loop precise-alternate-i386.iso /media/cdimage }}} === Comparing files === Jigdo then scans the existing files & compares them with the latest copies from the .jigdo template. {{{ Found xxxx of the xxxx files required by the template Copied input files to temporary file `precise-alternate-i386.iso.tmp' - repeat command and supply more files to continue }}} At this point you can include any additional sources you might have (optional) or press '''ENTER''' to continue to the next step. If you have no additional sources you can press '''ENTER''' twice and it will download the remaining packages that it needs. This, again, significantly cuts down on bandwidth and download time & easily keeps you up to date on the latest daily builds. === Update Precise Pangolin daily alternate iso image, terminal commands === To upgrade from an already dl Precise Pangolin iso image with less jigdo-lite confirmation use the terminal commands below: {{{ sudo mkdir /media/cdimage mv precise-alternate-i386.iso precise-alternate-i386.iso.old sudo mount -o loop precise-alternate-i386.iso.old /media/cdimage jigdo-lite --scan /media/cdimage --noask http://cdimage.ubuntu.com/daily/current/precise-alternate-i386.jigdo sudo umount /media/cdimage; sudo rm precise-alternate-i386.iso.old }}} == Links == * [[BurningIsoHowto]] Instructions on Burning the finished CD image * [[MountIso]] Loop mounting a CD image without burning it * [[ZsyncCdImage]] Update iso image using zsync