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victor
n00b
Joined: 19 Jun 2002
Posts: 9
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 Posted: Wed Jul 03, 2002 9:02 pm Post subject: automatic emerge rsync? |
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If I do 'emerge <package>' and I haven't updated my portage tree recently by running 'emerge rsync', then an older version of the package may be installed, is that right? In that case, wouldn't it be useful to have an option that would automatically check for newer versions, without the user having to explicitly reupdate the whole tree?
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delta407
Bodhisattva
Joined: 23 Apr 2002
Posts: 2876
Location: Chicago, IL
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| Posted: Thu Jul 04, 2002 3:44 am Post subject: |
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I don't think having Portage query the network on each and every install is a good idea, as a lot of people aren't connected 24/7 and a lot of sysadmins don't like the idea of their computer doing something (looking at the Portage tree) unless it's told to. A number of times, you don't want to use the latest version (like Xine for instance, as DVD playback is broken), and having Portage try to install the latest version is a Bad Thing (TM).
Furthermore, I'm sure the rsync servers wouldn't like the idea of setting up a new connection and polling the filesystem each and every time a Gentoo user tries to install a package.
If you want automatic updates, but "emerge rsync" in your crontab.
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ddanier
Tux's lil' helper
Joined: 19 May 2002
Posts: 87
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| Posted: Thu Jul 04, 2002 5:48 am Post subject: |
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i think he means not to update the whole portage tree, but the infos about everything that needs to be installed....
and if portage would do so there must be an option wether you decide to use the version of your own ebuild or that one from the net 
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rac
Bodhisattva
Joined: 30 May 2002
Posts: 6553
Location: Japanifornia
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| Posted: Thu Jul 04, 2002 6:08 am Post subject: |
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| ddanier wrote: | | i think he means not to update the whole portage tree, but the infos about everything that needs to be installed.... |
Even so, that's a nontrivial amount of overhead on the server side for each and every package install by every Gentoo user on the planet - the DNS round robin, building up and tearing down the rsync connection, etc.
Maybe if you had a server farm or lab environment with a lot of machines and you had a local portage rsync mirror, it might be feasible, but probably not as a default option in the wild.
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victor
n00b
Joined: 19 Jun 2002
Posts: 9
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| Posted: Thu Jul 04, 2002 12:18 pm Post subject: |
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| I see your point. However, I was talking about an "option" (to be explicitly given), not about a default. |
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digitalnick
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Joined: 30 Jun 2002
Posts: 243
Location: Lawrence KS USA
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| Posted: Thu Jul 04, 2002 4:56 pm Post subject: |
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| It dosnt seem to me that emerge rsync takes very long to do .... granted im on dsl but updating the while tree is a much better idea than only updating one package especially if a dependancy has changed. then you dont have the new dependancy ect.... and i think it would just cause more headaches. |
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delta407
Bodhisattva
Joined: 23 Apr 2002
Posts: 2876
Location: Chicago, IL
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| Posted: Thu Jul 04, 2002 11:27 pm Post subject: |
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| victor wrote: | | However, I was talking about an "option" (to be explicitly given) |
Why not just put "emerge rsync" in your crontab? Or you could set up an alias so that "emerge foo" runs "emerge rsync; emerge foo". There are already options to do this, the thing is, why don't you just rsync manually?
| digitalnick wrote: | | It dosnt seem to me that emerge rsync takes very long to do |
Right, but do you have any idea how much information is being exchanged? Or, better yet, how much work the rsync server has to do to match your Portage tree to its?
rac said it best; starting an rsync connection every time even a portion of users start an emerge cycle can quickly become expensive in terms of bandwidth and CPU time.
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Nitro
Bodhisattva
Joined: 08 Apr 2002
Posts: 661
Location: Wisconsin, USA
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| Posted: Fri Jul 05, 2002 12:33 am Post subject: |
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| delta407 wrote: | | rac said it best; starting an rsync connection every time even a portion of users start an emerge cycle can quickly become expensive in terms of bandwidth and CPU time. |
I don't think bandwidth is that big of an issue in comparison to CPU time + disk accesses. Rsync reads the mtime on the entire rsync tree and compares them. If we all had SCSI drives and dual processors it wouldn't be so bad.
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alec
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Joined: 19 Apr 2002
Posts: 270
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| Posted: Fri Jul 05, 2002 2:55 am Post subject: |
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| I guess the real question is: Do you emerge new stuff often enough so that you need to automatically sync up? Personally, I sync up a few times a week - maybe once a day if I'm really bored. I just don't waste time upgrading that one new package that's more than likely a new -rX version that I'll just recompile for no difference. If you really want to, just set it as a cron job, but I would be against having a real option so that overzealous people don't have an blindingly easy way to tie up the rsync servers. |
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