On 03/11/2014 02:34 PM, Martin Langhoff wrote:
On Tue, Mar 11, 2014 at 9:10 AM, Colin Walters <walters@xxxxxxxxxx> wrote:
Remember OSTree is a content-addressed object store (like git), not a chain
of deltas (like Subversion, and other systems out there such as Chromium
Autoupdate, and Docker).
Ouch -- so updates fetch EVERY file regardless of whether it has
changed between the snapshot installed and the target snapshot? That
is kind of bad.
It only downloads objects which are new, e.g. files that have changed,
or directories which contain a change (perhaps indirectly). This is
still a lot of HTTP requests, so it is very slow unless you happen to
have a local mirror.
Are you aware of the work done on OLPC's os-builder, which used rsync
"informed" by a per-snapshot metatada file?
Plain rsync is usually not deemed suitable for distributing things
because of the server-side overhead. zsync (rsync algorithm with a dumb
server) might work, though.
--
Florian Weimer / Red Hat Product Security Team
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