Ubuntu – How to update an ISO with zsync


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?

Best 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.

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