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Message-ID: | <4AB0B4FE.2090802@gmail.com> |
Date: | Wed, 16 Sep 2009 10:50:54 +0100 |
From: | Dave Korn <dave DOT korn DOT cygwin AT googlemail DOT com> |
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To: | cygwin AT cygwin DOT com |
Subject: | Re: setup.exe: Determine Geographically closest mirror programmatically |
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Dr. Christoph Gille wrote: >> Closest mirror? I'm not sure what you mean by this. 'setup.exe' does >> not require this as a setting. Actually, there is no such concept. You >> need to specify a mirror to work with but you can do that with '-s'. > > With each superfluous click I lose a user, so it would be best if setup.exe > would be run within http://3d-alignment.eu/ without user interaction. You could very simply compile a custom version of setup.exe for your users which had a different URL for the mirrors list, pointing to a custom list on your own server that only had one entry on it for 3d-alignment.eu. (You could even take advantage of the opportunity to replace the public key embedded in it with one that you could use for signing on your own server; otherwise your users will need to run setup.exe using the -X command-line flag to ignore security, or you'd need to distribute a key file to all your users somehow.) > I am not a network specialist, but I see two possibilities how I could > determine the closest cygwin mirror: > > (I) I could compare the IP numbers of all mirrors to the IP number of the > client and make a guess of the geographically closest site. I would use the > site where the first digits of the IP match best and I would then probe a > short file to check whether the mirror is indeed working. > > (II) This is what I am currently using to determine the fastest database > mirror for 3D-structures: I fetch a tiny probe file from each database > mirror and take the one with the shortest respond time. This method is more > simple but as there are that many cygwin mirrors, I am not sure whether I > would run into problems. Just as one further possibility, there's a bit of scripting on the page at the cygwin website about how to setup your own package server that uses a utility called 'netselect' to determine which is the fastest server in the mirrors list: http://sourceware.org/cygwin-apps/package-server.html You might (or perhaps might not) find it adaptable to suit your purposes. > When I have the mirror I would set it with the command line option of > setup.exe. I think this would work and could be done easily. Do you have > other ideas? If you wanted to be really cool, the URL that points to the alternative mirrors list on your own server can in fact be a CGI script of some kind that selects a geographically-nearest server based on the client's browser request headers, and returns a dynamically generated mirrors.lst with one entry customised just for that user. > Could you please tell me the URL of the file with the cygwin mirror list? http://cygwin.com/mirrors.lst In the setup.exe source code, this is defined in IDS_MIRROR_LST in res.rc. cheers, DaveK -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
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