On 12/11/2012 09:28 PM, Florian Friesdorf wrote:
Hi Eelco,
great work!
Eelco Dolstra <[email protected]> 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.
* 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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