I'm pretty sure if you "apt-get install foo" and there is a newer foo, it will upgrade it. However, I don't think it upgrades the chain of dependencies, unless maybe if there are declared conflicts? I've certainly tried out the "how do I upgrade one package" and "apt-get install" was the answer I found.
John =:-> On Thu, Apr 10, 2014 at 5:45 PM, Mark Shuttleworth <[email protected]> wrote: > On 10/04/14 12:00, Stuart Bishop wrote: > > On 10 April 2014 17:42, John Meinel <[email protected]> wrote: > >> All hooks are run sequentially (we explicitly take out a lock across all > >> hooks that want to run on a machine), just so that charms can do > whatever > >> they want with apt without stepping on each other's toes. > >> > >> I would think "install" is the most likely hook to actually do update > and > >> install. I'm not sure about a charm ever doing "upgrade" since that > would > >> upgrade other packages, right? > > Right. I'm wondering if that is the responsibility of the charm, or of > > other management systems like Landscape or configuring unattended > > security updates. > > > > At the moment I do have a charm that does an upgrade, and it does > > upgrade everything. I suspect I should remove that line. > > Yes, I would suggest that charms should focus on their specific > workload, not the system as a whole. > > That said, there can be bad results if, for example, the package listing > is out of date. If you try to apt-get a package, and the package listing > is way out of date, you'll be told the package cannot be found (because > newer versions have replaced it in the archive). Updating the package > *listing* is non-destructive, so an "apt-get update" is perfectly > reasonable. After that, a charm can "apt-get install foo" and know it > will get the current version. > > >> There isn't a process in juju today that does regular "keep my machines > up > >> to date" but you do have "juju run sudo apt-get update" if you want to > do it > >> manually. > > There is 'upgrade-charm'. I could argue that upgrade-charm should do a > > full update, so the new version of the charm is running with all the > > dependencies it was tested with. But I can argue the other way too :D > > Is it possible to use APT to upgrade just a single piece of software and > its dependencies? If so, that would be appropriate, yes. > > Mark >
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