On 09/01/2022 11:05, Achim Gratz wrote:
I've been experimenting with ZChunk with the idea of eventually using it
for setup:
https://www.jdieter.net/posts/2018/05/31/what-is-zchunk/
https://github.com/zchunk/zchunk
The chunked ini file is ~10…15% larger than the original (after
compression). In order to minimize the overhead, I've re-arranged the
package entries to have one chunk for every source package. The actual
benefit is that the typical download size reduces to less than 5% of the
original. Two examples of much longer timespans between updates are
provided at the end, which would still download only around a third of
the original:
[...]
WDYT?
This seems like a nice thing to have.
How would the signature be checked? Is it for the reconstructed full
zchunk file?
One slightly related issue which it would be good to address if possible
when adding this is that rsync is only file-atomic, not repo-atomic, so
we may get a compressed ini file and signature which don't match as they
are different moments in time during an update. I think currently no-one
notices this if it happens, as setup silently falls back to an older
compression type, but it would be nice to stop generating those eventually.
