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# Release 0.7 (2005-01-12)
- Binary patching. When upgrading components using pre-built binaries
(through nix-pull / nix-channel), Nix can automatically download and
apply binary patches to already installed components instead of full
downloads. Patching is “smart”: if there is a *sequence* of patches
to an installed component, Nix will use it. Patches are currently
generated automatically between Nixpkgs (pre-)releases.
- Simplifications to the substitute mechanism.
- Nix-pull now stores downloaded manifests in
`/nix/var/nix/manifests`.
- Metadata on files in the Nix store is canonicalised after builds:
the last-modified timestamp is set to 0 (00:00:00 1/1/1970), the
mode is set to 0444 or 0555 (readable and possibly executable by
all; setuid/setgid bits are dropped), and the group is set to the
default. This ensures that the result of a build and an installation
through a substitute is the same; and that timestamp dependencies
are revealed.
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