[Nix-dev] Nix 1.2 released

[Mathijs Kwik]

On Wed, Dec 12, 2012 at 3:38 AM, Shea Levy <shea at shealevy.com> wrote:
> On 12/11/2012 09:28 PM, Florian Friesdorf wrote:
>
> Hi Eelco,
>
> great work!
>
> Eelco Dolstra <eelco.dolstra at logicblox.com> writes:
>
>   * Nix no longer sets the immutable bit on files in the Nix store. Instead,
>     the recommended way to guard the Nix store against accidental
> modification
>     on Linux is to make it a read-only bind mount, like this:
>
>     $ mount --bind /nix/store /nix/store
>     $ mount -o remount,ro,bind /nix/store
>
>     Nix will automatically make /nix/store writable as needed (using a
> private
>     mount namespace) to allow modifications.
>
> Where would be the correct place to put these commands?
>
>
> The NixOS option nix.readOnlyStore in the systemd branch adds a command to
> the stage-2 init (the "real" init after the initrd finishes its setup). This
> is done very early in stage-2
> (https://github.com/NixOS/nixos/blob/859badc9663240f7d3c4279d9e657134f8395f17/modules/system/boot/stage-2-init.sh#L48).
> So that's probably a good guide for non-nixos systems.

Ah, I was looking for this, didn't know it was in the systemd branch only.

Is there a reason for the "if ! mountpoint -q /nix/store; then" line?
I have my nix store on a separate partition, so this won't work for me.

>
>
>   * Basic Nix expression evaluation profiling: setting the environment
> variable
>     NIX_COUNT_CALLS to 1 will cause Nix to print how many times each primop
> or
>     function was executed.
>
>   * New primops: concatLists, elem, elemAt and filter.
>
> The elem library function evaluates all list elements instead of
> returning "true" after finding a matching element. How does the builtin
> elem function behave?
>
>
> The builtin function breaks out of the comparison loop after a match is
> found (https://github.com/NixOS/nix/blob/1.2/src/libexpr/primops.cc#L980).
>
> regards
> florian
>
>
>
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