Re: Fedora 34 Change: DNF/RPM Copy on Write enablement for all variants (System-Wide Change)

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On Tue, Dec 22, 2020 at 09:41:35PM -0000, Matthew Almond via devel wrote:
> > On Mon, Dec 21, 2020, at 1:07 PM, Neal Gompa wrote:
> > 
> > Yes it does.  It avoids writing the compressed data and then copying it back out
> > uncompressed, which is the same amount of savings as the reflink approach.
> > 
> > (It's also equally incompatible with deltarpm)

This part doesn't seem to have been answered...

I'll restate what Colin said (please chime in if I misunderstand the proposal):

  During the download, packages are unpacked into a temporary root
  (/usr/.rpmtemp...), and the rpm headers are stored to disk in normal
  download location.
  During the installation, files are rename()d from this temporary
  location to the final destination.

I fail to see why this would be significantly better... The logic to
handle the split rpm contents would seem to be more complicated than the
rewrite with /usr/bin/rpm2extents. Other comments?

Zbyszek
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