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Re: [Qemu-discuss] Difference between commit and rebase

From: Max Reitz
Subject: Re: [Qemu-discuss] Difference between commit and rebase
Date: Tue, 27 Aug 2019 14:01:45 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

On 27.08.19 04:39, lampahome wrote:
>     It won’t do so by reading any clusters.  It just checks metadata to see
>     which clusters are allocated above the base image, and then writes those
>     to the base.
> So conclusion below:
> Non-similarity:
> qemu-img commit: only commit allocated clusters to base images.
> qemu-img rebase: compare each cluster if they're the same before
> committing. Commit cluster if difference.
> Do I misunderstand?

Well, rebase doesn’t commit.  It pulls the changes up to the overlay.

Also, as John has written, it should be noted rebase is also a more
versatile and general tool than commit.  (Hence its name, it allows
rebasing onto any backing file; whereas commit only works with the
backing chain as-is.)


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