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On 07/26/2012 11:26 AM, Rich Freeman wrote: |
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> Implementing it wouldn't necessarily be hard - just create a tmpfs |
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> under /var/tmp/portage, unshare off a new mount namespace, and |
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> read-only bind-mount everything needed from the root filesystem |
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> (including /var/tmp/portage/...), and chroot into it. When the build |
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> is done the process governing it terminates and the kernel wipes out |
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> all the mounts and then portage unmounts the tmpfs. You wouldn't need |
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> to use a tmpfs for the build - it would actually be zero-size as |
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> reported by df since it just contains a bazillion bind mounts, though |
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> all those mounts would consume slab memory. |
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It seems like you might need some kind of copy-on-write support, at |
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least to run pkg_setup. Apparently cowbuilder uses cow hardlinks for |
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that. Another way would be to use fiemap (cp --reflink). |
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-- |
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Thanks, |
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Zac |
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