[Nix-dev] Nix 1.2 released

[Shea Levy]

On 12/12/2012 02:30 AM, Mathijs Kwik wrote:
> 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.
>

I'm not completely clear about that... Nor about the /nix/rw-store, 
which seems to be created and then not touched (and indeed is empty on 
my system).

>>
>>    * 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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