if you calculate a checksum with all mirrored files - you can guarantee
that the bits are the same
on both side, no ?
How exactly would you calculate that checksum?
by calculating the grand hash of each file hash.
In this case, the checksum would not be a reliable indication that the
files are actually up-to-date. For example, a mirror may keep updating
files into the wrong location (not the location that is then used to
serve the files), so that the files being served are from a stale copy.
This is not theoretical - it actually happened in my mirror setup at one
time.
That could take a few hours per change.
why that ? you don't calculate the checksum of a file your already
have twice.
Even if you do, it's very fast to call md5.
try it:
$ find mirror | xargs md5
this takes a few seconds at most on the whole mirror
I tried it, and on my mirror, it took 27 minutes and 7 seconds.
So not exactly hours, but not "a few seconds" either.
Regards,
Martin
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