June 2010 - Darwin-dev - lists.apple.com

Re: Forcing 32-bit operation of the entire system?
by Shantonu Sen 05 Jun '10

05 Jun '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Nothing will save you from that question. What are you really trying to do? The OS hasn't been qualified to work on your system in this configuration. I know of issues that can prevent booting if you force 32-bit binaries to be used on certain configs due to assumptions they make about their environment. Shantonu Sent from my MacBook On Jun 5, 2010, at 1:47 AM, FZiegler wrote: > Hi list, > > On a machine that supports 64-bit operation (MacBook4,1 in this case), is it possible to boot (or install) Snow Leopard to run wholly 32-bit? > > I know kernel_task runs 32-bit by default, and individual apps can be set to do so (e.g. http://support.apple.com/kb/TS2827) but here I really mean *everything* -- launchd, Dock, Finder, the shell,... > > I'm hoping the question is specific enough to spare me "Why would you want to do this?" Thanks for any pointers, > > Francois Z. > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-dev/ssen%40apple.com > > This email sent to ssen(a)apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Creating dmg on 10.5 and 10.6
by Axel Luttgens 05 Jun '10

05 Jun '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Le 5 juin 2010 à 13:42:46, Rakesh Singhal a écrit : > [...] > I am using "ditto -rsrc -V src_file dst_file", does it do any > compression and copy the data. When I burn it on DVD, it maintains the size. No, ditto doesn't compress data, unless explicitely told (for example, with the -z option). But knowing that you've made use of ditto is anyway a useful info (see below). > I have tried "srcfolder" option and I can create compressed image. But when > I burn this image on DVD, it expands to equivalent of size of data (around 1 > GB). > > Hi Stphane, > > Thanks I will try -fsargs with 10.5 and see what happens. > > Hi Axel, > > If I mount images created on both 10.5 and 10.6, the size data is same but > image size is different as I mentioned. I will check with "xattr -l <file>" > but how is it going to help me. If you really managed on 10.6 to store ±950 Mb of data (as displayed by 10.6) on an uncompressed disk image of 600 Mb, I thought that you perhaps managed to somehow preserve the new file-compression scheme that came with Snow Leopard for its hard disks. For example, "ls -al /bin/cp" shows a size of 57632 bytes for that executable, while in fact it is compressed and has a logical size of 15473 bytes only on the disk. In order to achieve this, Snow Leopard transparently stores the compressed data in the file's resource fork and attaches an attribute to the file ("com.apple.decmpfs"). Now, when one copies /bin/cp to a disk image (for example, in the Finder's GUI), it is expected that the copy will be a regular one, not a compressed one, so as to be shareable with previous versions of the OS. But it looks like that "ditto -rsrc" preserves that "bizarre" format. This seems to be confirmed by a quick trial I've just performed here. Looks like a ditto bug. HTH, Axel _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Creating dmg on 10.5 and 10.6
by Rakesh Singhal 05 Jun '10

05 Jun '10

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Re: Creating dmg on 10.5 and 10.6
by Chris Suter 05 Jun '10

05 Jun '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Hi Rakesh, On Sat, Jun 5, 2010 at 9:42 PM, Rakesh Singhal <rakesh.singhal(a)gmail.com> wrote: > That is fine about showing 629 MB (600*1024*1024), difference of base 10 and > base 2. I am using "ditto -rsrc -V src_file dst_file", does it do any > compression and copy the data. No, ditto doesn't compress data (although on Snow Leopard it can make use of HFS+ compression). > When I burn it on DVD, it maintains the size. Yes, it would. > I have tried "srcfolder" option and I can create compressed image. But when > I burn this image on DVD, it expands to equivalent of size of data (around 1 > GB). Yes, a compressed image just stores the data for the image in compressed form but if you burn the image to a DVD it will be expanded. Still I can't imagine that’s a problem for you—it makes little difference if you use, say, half a DVD rather than three quarters of a DVD. At this stage I would suggest taking your problem off this list since it seems to have little to do with Darwin development. Kind regards, Chris _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Creating dmg on 10.5 and 10.6
by Rakesh Singhal 05 Jun '10

05 Jun '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:cc:content-type; bh=kiPXFFgbNVVxPFdVKsKSnaQ3T7a0LlOTAd6y8RrZWIc=; b=fizVz3KjgfB/XG9xQQCvEb20TJd+JGsGR6p9fHdxH3PS6+IldP7eXb7o87UuFejuCg 1+GKlyMOA3loQMgR4kSRDXtv4o94I0Zm3Rz1yeKZ/iff/JOObvOutmnsKR8DGL4usgwb aXLmglmP9LDVFXqUd+YAoyn6pRxP+VZtNHQAw= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=ZelilwVMq3ICB7taZBjl0rwaGYhaUBNYYa5u73BQ1w2iivIzl+vOZLXvsKTS3KDOiL doAeIpLZlYSazfI736jl/7LFCiCuq1OLIKFR6v7yf9GAWjRqNf/ykSy6iVvJMoO1eDmo FqJJUOMFoKPDLt+UmmgBjSpqU+VczutegANhc= _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Forcing 32-bit operation of the entire system?
by FZiegler 05 Jun '10

05 Jun '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Thunderbird 2.0.0.24 (Macintosh/20100228) Hi list, Francois Z. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… On a machine that supports 64-bit operation (MacBook4,1 in this case), is it possible to boot (or install) Snow Leopard to run wholly 32-bit? I know kernel_task runs 32-bit by default, and individual apps can be set to do so (e.g. http://support.apple.com/kb/TS2827) but here I really mean *everything* -- launchd, Dock, Finder, the shell,... I'm hoping the question is specific enough to spare me "Why would you want to do this?" Thanks for any pointers, This email sent to site_archiver(a)lists.apple.com

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Re: Creating dmg on 10.5 and 10.6
by Chris Suter 04 Jun '10

04 Jun '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On Fri, Jun 4, 2010 at 11:08 PM, Rakesh Singhal <rakesh.singhal(a)gmail.com> wrote: > I am creating one image using following command on 10.6 intel: > > hdiutil create -layout SPUD -megabytes 600 -fs HFS+ -volname myimage > myimage.dmg > > then I mount it using > > hdiutil attach -quiet -owners on myimage.dmg > > Now I copy my data to mounted volume (/Volumes/myimage). The size of my data > is around 950 MB and I am able to copy the complete data in this image. No you're not. 950 MB doesn't fit into 600 MB unless you're compressing it as you copy it. A 600 MB disk image will be able to store 600 MB less 64 sectors for the partition table (since it's a SPUD layout) and less HFS+ filesystem overhead. > I checked the size of image in finder and it is 629.1 MB. That's base 10. You'll find it's exactly 600 MiB (base 2) which is what you asked for. > Do I need to modify command in 10.5 to get same result as in 10.6, if it is > possible? You need to find out why your copy command is saying it has worked when it hasn't. You should consider using the "srcfolder" parameter which will cause hdiutil to pick the size for you and copy the files. Kind regards, Chris _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Creating dmg on 10.5 and 10.6
by Axel Luttgens 04 Jun '10

04 Jun '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Le 4 juin 2010 à 15:08:51, Rakesh Singhal a écrit : > Hi all, > > [...] > > I would like to know what is the difference in 10.5 and 10.6 in creating > image using same command. Does it compress the data in 10.6 or some layout > difference? > Do I need to modify command in 10.5 to get same result as in 10.6, if it is > possible? > > Please let me know if I am wrong somewhere. > > Thanks in advance. > > Regards, > rksinghal Hello Rakesh, Could you mount your first disk image (the one created on 10.6) on a 10.5.x system and look from there at the file sizes? And run "xattr -l <file>" on some files looking suspiciously very small, if any? Axel _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Creating dmg on 10.5 and 10.6
by Stéphane Sudre 04 Jun '10

04 Jun '10

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com On 10-06-04, at 15:08, Rakesh Singhal wrote: Hi all, I am creating one image using following command on 10.6 intel: then I mount it using hdiutil attach -quiet -owners on myimage.dmg hdiutil detach -quiet /Volumes/myimage -force I checked the size of image in finder and it is 629.1 MB. This was due to the default FileSystem settings. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… hdiutil create -layout SPUD -megabytes 600 -fs HFS+ -volname myimage myimage.dmg Now I copy my data to mounted volume (/Volumes/myimage). The size of my data is around 950 MB and I am able to copy the complete data in this image. Finally I unmount it using If I follow the same procedure on same machine but on 10.5.x, it is not able to copy the same data (950 MB). I need to create image of around 1000 MB to copy this data. I am running all these commands in a script. I would like to know what is the difference in 10.5 and 10.6 in creating image using same command. Does it compress the data in 10.6 or some layout difference? Do I need to modify command in 10.5 to get same result as in 10.6, if it is possible? Please let me know if I am wrong somewhere. Based on experience, depending on the OS version, when you create a 10 MB disk image with Disk Utility, you can either get 50 KB of available space or 9.something MB. This has been addressed in the latest Snow Leopard version IIRC. Check -fsargs to see if using some additional arguments could help on your version of Mac OS X 10.5. This email sent to site_archiver(a)lists.apple.com

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Creating dmg on 10.5 and 10.6
by Rakesh Singhal 04 Jun '10

04 Jun '10

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