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How do I update an ISO with zsync?

rated 0 times [ 22] [ 0] / answers: 1 / hits: 7751 / 3 Years ago, tue, november 2, 2021, 7:43:18

The context here is the Oneric development ISO. I don't want to have to re-download this every time something changes. I notice that there's a .zsync file in the download directory. From what I know, this should let me update only the chunks that have changed, saving a ton of bandwidth.

The only problem is, I don't have a clue what I'm doing :) Could somebody push me in the right direction to keep oneiric-desktop-amd64.iso up to date?

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2 Years ago

answered 3 Years ago soahan · Accepted Answer

Turns out I was being dense. A correct Googling and I found my answer on the Ubuntu Wiki. All I need to run is:

zsync http://cdimage.ubuntu.com/daily-live/current/oneiric-desktop-amd64.iso.zsync

I should point out that my previously-downloaded ISO is in the same path as this.

It downloaded the zsync file, checked it against my ISO and updated it to the latest version, 162MB spent. Bargain.