This script downloads MD5SUMs from the server, checks it against the local copy's MD5SUM. If [ -n "$.md5" ||Įcho 'mismatch!\nDownload failed.' exit 2 # If invoked with an argument, use that as the image name # Uncomment to adjust the ISOPATH, if you need to # This script updates individual ISO image from via rsync # SPDX-License-Identifier: GPL-3.0-or-later # SPDX-FileCopyrightText: ? 2021 Peter J. # SPDX-FileCopyrightText: © 2010 Aaditya Bhatia # SPDX-FileCopyrightText: © Henrik Nilsen Omma In some cases you may need to manually set ISOPATH if you are downloading an image not automatically detected. You can set ISO inside the script or simply pass it in on the command-line (to make it easier to sync multiple ISO images). To run this script successfully, you will need to set the DIR variable according to your needs. Ī slightly more advanced script will automate much of the syncing process. for kubuntu : rsync -LzhhP rsync:///cdimage/kubuntu/daily-live/current/utopic-desktop-amd64.iso. Note: If you are using other flavours of Ubuntu you can add the flavour's name in the rsync path after cdimage/, e.g. If you have a local Ubuntu archive mirror or cache, you can also use Jigdo, rsync is handy for finishing up Jigdo downloads that still have a few missing pieces. You can ascertain the filename to download by getting a recent URL from and substituting http for rsync. L is to "resolve symbolic links" (sometimes used internally, you want a hard copy), -z is compression, -hh is human readable file size (in KB or MB), and -P is a progress indicator. Will sync the server's daily Utopic desktop image (for amd64) to your local system with an older desktop image already stored on your hard drive. For example: rsync -LzhhP rsync:///cdimage/daily-live/current/utopic-desktop-amd64.iso. A number of the Ubuntu servers also work as rsync servers with similar URIs to the websites. requires more data to be downloaded) for ISO images. rsync is another implementation of the same algorithm that zsync uses, but it requires special software at the server end and is generally less efficient (i.e. Knowing that, we can return to our terminal session, navigate to a directory of our choice and use zsync to sync an existing image found there (or download one in full, if none are present) with a single command : zsync Īnother way to update your ISO is by using rsync. The first URI is for the x86_64 image, the second is its zsync control file: These are the URIs for the latest daily build of the current Ubuntu development release, Kinetic Kudu. The Ubuntu archives provide the necessary zsync control files alongside each of the ISO images in the very same directory, such that if you already know the URI for the installation image you want, you also know the URI for its zsync file, which is identical except for the addition of. You will asked to authenticate with your password and then zsync will be downloaded and installed on your system.Īll Ubuntu CD images are always available at, as well as at any of our 400 mirror sites across the globe. Open a terminal session and enter the following command: Simply supply the checksum for the Kubuntu ISO along with the path to the standard ISO you already have to zsync, and it will download just the parts that differ between the two versions. Let's suppose that you've already downloaded the standard ISO image for Ubuntu Desktop, then later decide that you want to install Kubuntu instead. The result is that it is now trivially easy to keep a perpetually up-to-date local copy of one or many Ubuntu installation ISOs with the most minimal investment of time and bandwidth, since the daily installer images generally change very little.Īnother element of zsync's allure lies in its ability to performs a checksum comparison that makes it possible to change the flavour of the ISO after you've downloaded it to your system. Ubuntu has distributed its installation images using zsync since August 2009, since the ISO format used is perfectly suited to make use of the utility's advantages. Making use of the same algorithm that powers the venerable rsync file copy utility, it quickly identifies only the parts of a file that have changed between two copies of a file and retrieves only those, ending the need to download a full copy of a file after every new release in order to remain up-to-date. Zsync is a file transfer utility that operates at remarkable levels of efficiency without requiring a specialized server or network implementation, instead operating over the same HTTP protocol that serves billions of web pages every hour over the public internet.
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