Re: [Nix-dev] Nix expression built-in type limitations
Hello, On Apr 30, 2015, at 4:45 PM, Terrance Kennedy terrancerkenn...@gmail.com wrote: Hi, I'm working on a Python project to convert Python built-in types to Nix built-in types and it raised some quesions on the limitations of built-in Nix types. I've been able to gather some information using nix-repl and reading the Nix expression parser code, but am not sure on the following: - Integer: Appear to be either 32 or 64 bit signed integer depending on the underlying architecture. Is this correct? Integers are mapped to the C++ long type [1]. - String: From what I can tell, since Nix strings are based on C++ std::string, they don't enforce or expect any kind of encoding. Is it recommended or tested to put non-ASCII data (in any encoding) into a Nix string? What about binary data? Strings are stored as null-terminated char arrays[2]*. Any char besides 0 can safely be stored in them, but if you try to display them they will be treated as ASCII. - Path: Are there any disallowed characters in a Nix path? How can one represent paths with whitespace? Path literals are determined by [3], but you can append a string to a path, so e.g. (./. + /filename with spaces.txt) will result in a path with spaces in the name. Cheers, - Terrance ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev * They also have associated context, which is irrelevant for the purposes of this question. [1]: https://github.com/NixOS/nix/blob/1.8/src/libexpr/value.hh#L38 [2]: https://github.com/NixOS/nix/blob/1.8/src/libexpr/value.hh#L115 [3]: https://github.com/NixOS/nix/blob/1.8/src/libexpr/lexer.l#L82 ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
[Nix-dev] gold linker in shell.nix
How do I link with gold in nix-shell? ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] How to bootstrap a server using Nixops?
On Fri, 1 May 2015 08:46:14 +
Rob Vermaas rob.verm...@gmail.com wrote:
Hi Jeff,
On Thu, Apr 30, 2015 at 11:17 PM, Jeffrey David Johnson jef...@gmail.com
wrote:
It's possible I'm getting the wrong idea about what nixops is for, but I
used
it to set up an Amazon EC2 instance with the idea of logging into the
server
and administering it using local commands afterward.
That's an interesting and unexpected usecase of nixops. I wouldn't use
nixops at all if you plan on doing this. Why not just start instance in the
Amazon AWS Console or using the command line tools of AWS? (for ami's see
https://nixos.org/wiki/NixOS_on_Amazon_EC2)
You're right that looks more like what I wanted! Sorry just didn't see
it before. I'll post my scripts below for clarification but don't worry
about troubleshooting them. I wonder if the NixOps manual should
include a link to that page? Something like If you just want to
install NixOS on the server, see here instead. It's the kind of
distinction, like installing the OS itself to a USB drive vs installing
the LiveCD installer, that seems obvious in hindsight but new
people might miss.
The initial install goes
fine. Afterward I clone my nixcfg repo (including nixpkgs submodule) and
try to
set it up the way I would a physical machine, by copying everything from
/etx/nixos/* into nixcfg/configs/cyno.nix and modifying it to
point inside the repo:
{ config, pkgs, ... }:
{
imports = [
../nixpkgs/nixos/modules/virtualization/amazon-config.nix
];
ec2.hvm = true;
services.journald.rateLimitBurst = 0;
}
When I do a `nixos-rebuild` (part of install.sh) though, it gives this
error:
[root@cyno:~/nixcfg]# ./install.sh test
building Nix...
error: getting status of
‘/root/nixcfg/nixpkgs/nixos/modules/virtualization/amazon-config.nix’: No
such file or directory
(use ‘--show-trace’ to show detailed location information)
error: getting status of
‘/root/nixcfg/nixpkgs/nixos/modules/virtualization/amazon-config.nix’: No
such file or directory
(use ‘--show-trace’ to show detailed location information)
building the system configuration...
error: getting status of
‘/root/nixcfg/nixpkgs/nixos/modules/virtualization/amazon-config.nix’: No
such file or directory
(use ‘--show-trace’ to show detailed location information)
Now I notice something strange:
/root/nixcfg/nixpkgs/nixos/modules/virtualization/amazon-config.nix
exists, but
`ls` throws an error when listing it:
ls /root/nixcfg/nixpkgs/nixos/modules/virtualization/amazon-config.nix
ls: cannot access
/root/nixcfg/nixpkgs/nixos/modules/virtualization/amazon-config.nix: No
such file or directory
If I approach it slowly by listing /root/nixcfg, then
/root/nixcfg/nixpkgs,
all the way to the full path it *does* work. I googled around a little and
according to this:
http://superuser.com/questions/446280/no-such-file-or-directory
The error can also mean a missing dynamically linked library. So I tried
ldd as
directed (though I don't understand the output), and got this:
ldd $(which ls)
linux-vdso.so.1 (0x7fff01dec000)
libacl.so.1 =
/nix/store/6mz0jhl389h7panazs5sayrydajia1s2-acl-2.2.52/lib/libacl.so.1
(0x7f55d0f54000)
libc.so.6 =
/nix/store/93zfs0zzndi7pkjkjxawlafdj8m90kg5-glibc-2.20/lib/libc.so.6
(0x7f55d0bb7000)
libattr.so.1 =
/nix/store/ndszpck395bi55jnz50ny99y4pvj6dqn-attr-2.4.47/lib/libattr.so.1
(0x7f55d09b3000)
/nix/store/93zfs0zzndi7pkjkjxawlafdj8m90kg5-glibc-2.20/lib/ld-linux-x86-64.so.2
(0x7f55d115c000)
Anyway I think there's something wrong with how the system is set up, but
not
sure what. Is there a correct way to bootstrap it to the point of using
the same config as my other machines?
Can you perhaps show us the contents of install.sh? Can you give us the AMI
that was used (see AWS Console or commandline tools) ? Also, how did you
copy the contents of /etc/nixos/* to /root/nixcfg ? I have never seen this
behavior before, and tested something similar yesterday successfully.
install.sh is just a wrapper to point nixos-rebuild to my repo:
#!/usr/bin/env bash
# Automates rebuilding nixos from my repos.
# Takes the same args as nixos-rebuild.
# TODO also put NIXPKGS_CONFIG in here instead of home dir
NIXCFG=$(cd $(dirname ${BASH_SOURCE[0]}) pwd)
[[ -z $@ ]] NIXARGS=test --fast || NIXARGS=$@
nixos-rebuild \
-I mypkgs=${NIXCFG}/mypkgs \
-I nixpkgs=${NIXCFG}/nixpkgs \
-I nixos-config=${NIXCFG}/configs/$(hostname).nix \
${NIXARGS}
Sorry I should have been clearer about copied, I just meant I wrote
nixcfg/configs/cyno.nix to match what I thought the contents
of /etx/nixos did: import amazon-config.nix and set a couple other
settings. The other files seemed redundant with ones in nixpkgs,
which was the next thing I planned to figure out. I tried importing the
file with this notation too:
[Nix-dev] Some package outputs not linked into the system profile
Hi all, Last weekend I installed my first full NixOS system on my Thinkpad and overall everything went relatively smoothly (I was brave enough to try the unstable channel). I added all desired packages to environment.systemPackages to start with, but have since noticed that not all build outputs have been linked into the system profile /run/current-system/sw and are thus not in my path. For example, the poppler-utils package results in symlinks in bin and lib if installed into my user profile via nix-env, but under the system profile I can see only the library symlinks under lib. I've also noticed this with other packages, e.g. none of the gtk themes in gnome-themes-standard show up in share under the system profile, but they do under the user profile. Can this behaviour be easily explained? The workaround is obvious, but it would be nice to understand what is going on. Many thanks, Tim ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] How to bootstrap a server using Nixops?
Hi Jeff,
On Thu, Apr 30, 2015 at 11:17 PM, Jeffrey David Johnson jef...@gmail.com
wrote:
It's possible I'm getting the wrong idea about what nixops is for, but I
used
it to set up an Amazon EC2 instance with the idea of logging into the
server
and administering it using local commands afterward.
That's an interesting and unexpected usecase of nixops. I wouldn't use
nixops at all if you plan on doing this. Why not just start instance in the
Amazon AWS Console or using the command line tools of AWS? (for ami's see
https://nixos.org/wiki/NixOS_on_Amazon_EC2)
The initial install goes
fine. Afterward I clone my nixcfg repo (including nixpkgs submodule) and
try to
set it up the way I would a physical machine, by copying everything from
/etx/nixos/* into nixcfg/configs/cyno.nix and modifying it to
point inside the repo:
{ config, pkgs, ... }:
{
imports = [
../nixpkgs/nixos/modules/virtualization/amazon-config.nix
];
ec2.hvm = true;
services.journald.rateLimitBurst = 0;
}
When I do a `nixos-rebuild` (part of install.sh) though, it gives this
error:
[root@cyno:~/nixcfg]# ./install.sh test
building Nix...
error: getting status of
‘/root/nixcfg/nixpkgs/nixos/modules/virtualization/amazon-config.nix’: No
such file or directory
(use ‘--show-trace’ to show detailed location information)
error: getting status of
‘/root/nixcfg/nixpkgs/nixos/modules/virtualization/amazon-config.nix’: No
such file or directory
(use ‘--show-trace’ to show detailed location information)
building the system configuration...
error: getting status of
‘/root/nixcfg/nixpkgs/nixos/modules/virtualization/amazon-config.nix’: No
such file or directory
(use ‘--show-trace’ to show detailed location information)
Now I notice something strange:
/root/nixcfg/nixpkgs/nixos/modules/virtualization/amazon-config.nix
exists, but
`ls` throws an error when listing it:
ls /root/nixcfg/nixpkgs/nixos/modules/virtualization/amazon-config.nix
ls: cannot access
/root/nixcfg/nixpkgs/nixos/modules/virtualization/amazon-config.nix: No
such file or directory
If I approach it slowly by listing /root/nixcfg, then
/root/nixcfg/nixpkgs,
all the way to the full path it *does* work. I googled around a little and
according to this:
http://superuser.com/questions/446280/no-such-file-or-directory
The error can also mean a missing dynamically linked library. So I tried
ldd as
directed (though I don't understand the output), and got this:
ldd $(which ls)
linux-vdso.so.1 (0x7fff01dec000)
libacl.so.1 =
/nix/store/6mz0jhl389h7panazs5sayrydajia1s2-acl-2.2.52/lib/libacl.so.1
(0x7f55d0f54000)
libc.so.6 =
/nix/store/93zfs0zzndi7pkjkjxawlafdj8m90kg5-glibc-2.20/lib/libc.so.6
(0x7f55d0bb7000)
libattr.so.1 =
/nix/store/ndszpck395bi55jnz50ny99y4pvj6dqn-attr-2.4.47/lib/libattr.so.1
(0x7f55d09b3000)
/nix/store/93zfs0zzndi7pkjkjxawlafdj8m90kg5-glibc-2.20/lib/ld-linux-x86-64.so.2
(0x7f55d115c000)
Anyway I think there's something wrong with how the system is set up, but
not
sure what. Is there a correct way to bootstrap it to the point of using
the same config as my other machines?
Can you perhaps show us the contents of install.sh? Can you give us the AMI
that was used (see AWS Console or commandline tools) ? Also, how did you
copy the contents of /etc/nixos/* to /root/nixcfg ? I have never seen this
behavior before, and tested something similar yesterday successfully.
Cheers,
Rob
--
Rob Vermaas
[email] rob.verm...@gmail.com
___
nix-dev mailing list
nix-dev@lists.science.uu.nl
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[Nix-dev] Nix expression built-in type limitations
Hi, I'm working on a Python project to convert Python built-in types to Nix built-in types and it raised some quesions on the limitations of built-in Nix types. I've been able to gather some information using nix-repl and reading the Nix expression parser code, but am not sure on the following: - Integer: Appear to be either 32 or 64 bit signed integer depending on the underlying architecture. Is this correct? - String: From what I can tell, since Nix strings are based on C++ std::string, they don't enforce or expect any kind of encoding. Is it recommended or tested to put non-ASCII data (in any encoding) into a Nix string? What about binary data? - Path: Are there any disallowed characters in a Nix path? How can one represent paths with whitespace? Cheers, - Terrance ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] Some package outputs not linked into the system profile
Hi. On 05/01/2015 09:30 PM, Tim Williams wrote: Can this behaviour be easily explained? Explanation is easy: if a multiple-output derivation is used as a build input or systemPackages, only the first output is meant (in the current master). Until recently, multiple outputs were rather rare, and a better framework for them is currently brewed in the closure-size branch (by me mostly so far). I would prefer to address such issues in that branch or after its eventual merge. Vladimir smime.p7s Description: S/MIME Cryptographic Signature ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
Re: [Nix-dev] gold linker in shell.nix
On 05/01/2015 06:21 PM, Nikita Karetnikov wrote: How do I link with gold in nix-shell? Stdenv should put ld.gold on PATH, so then it can be used just as ld.gold is used, I guess. Vladimir smime.p7s Description: S/MIME Cryptographic Signature ___ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
