Bug#1011343: WISHLIST: Offical ALL-IN-ONE images?
Hi,
i reply to 1011343@bugs.debian.org and zhangboyang.id@gmail.com because
of my question and sketch for a procedure to merge DLBD-1 and -2 after
download into the desired ALL-IN-ONE ISO.
Andrew M.A. Cater wrote to debian-cd@lists.debian.org:
> If the original poster wants one huge .iso as one file to download from
> cdimage.debian.org - then 2 x double layer Blu-Ray (say) as one file
> would be 100GB or so.
11.3.0 is at (48245475328+35798159360)/1073741824 = 78.272 GiB.
$ gunzip <debian-11.3.0-amd64-DLBD-1.jigdo | grep '# Image size'
# Image size 48245475328 bytes
> Even on a good quality link, that's quite a time.
Yes. Especially since at least with jigdo-lite the bottleneck is the
latency of downloading the packages. A 78 GiB ISO might need a day to
become complete. jigdo-lite is graceful about being interrupted and resumed
the other day, though.
Running several jigdo-lite downloads simultaneously might mitigate the
latency problem so that bandwidth becomes the bottleneck.
> I don't actually know how long it take to create the .jigdo and .template
> files - I don't think it's as long as generating the full .iso files
They are created by libjte under control of libisofs under control of
xorriso as side effect of actual ISO production under control of debian-cd.
(I'm developer of libisofs and xorriso, and co-funder of libjte, which is
now back in the hands of Steve McIntyre from whose genisoimage code it
got large parts of its entrails.)
I was possibly wrong with guessing that the ISO is dumped into /dev/null,
although debian-cd seems to be smart enough to read the various checksums
from the .jigdo files, rather than calculating them from the .iso files.
The checksum code
https://sources.debian.org/src/debian-cd/3.1.35/tools/imagesums/#L57
reminded me that there are .torrent files made, which obviously need
the .iso files at least at build time.
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> it's always good to have otehr people to think round a problem with.
Is there documentation from which i could learn how the stuff in (i guess)
/dists of DLBD-1 and DLBD-2 could be merged so that it properly describes
a merged pool tree ?
My rough idea would be:
- mount both ISOs
- derive merged /dists files
- run xorriso to let it
- load DLBD-1 with its boot equipment
- merge-in the pool tree of mounted DLBD-2
- overwrite the old /dists files by the newly derived ones
- automatically replay the commands for the loaded boot equipment
- store the result as new .iso file
The second step is where i would need info or advise.
Have a nice day :)
Thomas
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