how to figure out beforehand how much disk space will be needed when applying a static-delta
- From: Davis Roman <davis roman84 gmail com>
- To: ostree-list gnome org
- Subject: how to figure out beforehand how much disk space will be needed when applying a static-delta
- Date: Mon, 21 Sep 2020 11:34:55 -0400
Hi,
I work on embedded devices which don't have much onboard eMMC space so I'm trying to figure out
if there is a deterministic way to figure out how much disk space is needed when performing
an 'ostree static-delta apply-offline && ostree admin deploy'
Of course, I can always just attempt the above commands and if it fails then I'll know I don't have enough space however
my plan is to implement something a bit smarter where I check ahead of time if I have X MBs available otherwise don't bother
with the above commands. My issue at the moment is how to figure out how many X MBs are needed.
Initially, I was thinking that the size of a static delta file correlates to how much disk space will be required however
this turns out not to be the case.
I ran a test today for a 241MB static delta file which turned out to require 672MB of actual disk space.
Is there something, perhaps via the command line, that can tell me that given a 241MB static delta, I'll need 672MB available?
Thank you,
Davis
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