[Nix-dev] Customizing packages via overrideDerivation

[Andrey Rogozhin]

On 10/18/13, Marc Weber <marco-oweber at gmx.de> wrote:
> Excerpts from Andrey Rogozhin's message of Fri Oct 18 18:51:09 +0200 2013:
>> Thanks, Eelco! I've just tried to fetch a fresh installation CD and
>> did a fresh install with the updated expression as you advised.
> That's the first thing to learn about nixos: Never do a fresh install.
> Its not necessary. Update the channel or your nixpkgs repository.
> The update will be incremental and deterministic at the same time!
> The Nix manual should make this clear.
>
> There is the /run/current-system/sw/bin indirection taking care of
> "switching the system" and similar /etc/* symlink stuff.
>
> Also compare with https://nixos.org/wiki/Nix_impurities
>
> To be be fool proof you need to:
>
> - checkout nixpkgs
>
> - export
> NIX_PATH=nixos=path-to-nixpkgs/nixos:nixpkgs=path-to-nixpkgs:nixos-config=/etc/nixos/configuration.nix
>
> Then run any of:
>
>   nixos-rebuild test/boot/switch/vm
>   (see --help)
>

Marc, thanks for pointing that out, but I think something else is at
play here as I tried the commands you suggested and still get failed
build:

[root at nixos-pro:~]# mkdir /root/hack

[root at nixos-pro:~]# cd /root/hack

[root at nixos-pro:~/hack]# git clone
git://github.com/NixOS/nixpkgs.gitCloning into 'nixpkgs'...
remote: Counting objects: 302760, done.
remote: Compressing objects: 100% (88334/88334), done.
remote: Total 302760 (delta 203730), reused 287753 (delta 189626)
Receiving objects: 100% (302760/302760), 98.19 MiB | 3.42 MiB/s, done.
Resolving deltas: 100% (203730/203730), done.
Checking connectivity... done

[root at nixos-pro:~/hack]# git clone git://github.com/NixOS/nixos.git
Cloning into 'nixos'...
remote: Counting objects: 33256, done.
remote: Compressing objects: 100% (18731/18731), done.
remote: Total 33256 (delta 17724), reused 29660 (delta 14200)
Receiving objects: 100% (33256/33256), 10.20 MiB | 1.86 MiB/s, done.
Resolving deltas: 100% (17724/17724), done.
Checking connectivity... done

[root at nixos-pro:~/hack]# export
NIX_PATH="nixos=/root/hack/nixos:nixpkgs=/root/hack/nixpkgs:nixos-config=/etc/nixos/configuration.nix"

[root at nixos-pro:~/hack]# nixos-rebuild test --show-trace
building Nix...
building the system configuration...
error: while evaluating the attribute `drvPath' at
`/nix/store/837scsdsdrlp49xv79ivrc5fbnfm6rrm-nix-1.6/share/nix/corepkgs/derivation.nix:19:9':
while evaluating the builtin function `derivationStrict':
while instantiating the derivation named `nixos-13.09pre-git' at
`/root/hack/nixos/modules/system/activation/top-level.nix:87:5':
while evaluating the derivation attribute `buildCommand' at
`/root/hack/nixos/modules/system/activation/top-level.nix:89:5':
while evaluating the attribute `outPath' at
`/nix/store/837scsdsdrlp49xv79ivrc5fbnfm6rrm-nix-1.6/share/nix/corepkgs/derivation.nix:18:9':
while evaluating the builtin function `getAttr':
while evaluating the builtin function `derivationStrict':
while instantiating the derivation named `etc' at
`/root/hack/nixos/modules/system/etc/etc.nix:12:5':
while evaluating the derivation attribute `sources' at
`/root/hack/nixos/modules/system/etc/etc.nix:19:5':
while evaluating the attribute `outPath' at
`/nix/store/837scsdsdrlp49xv79ivrc5fbnfm6rrm-nix-1.6/share/nix/corepkgs/derivation.nix:18:9':
while evaluating the builtin function `getAttr':
while evaluating the builtin function `derivationStrict':
while instantiating the derivation named `dbus-conf' at
`/root/hack/nixos/modules/services/system/dbus.nix:14:5':
while evaluating the derivation attribute `buildCommand' at
`/root/hack/nixos/modules/services/system/dbus.nix:16:5':
while evaluating `concatMapStrings' at
`/root/hack/nixpkgs/lib/strings.nix:18:25':
while evaluating `fold' at `/root/hack/nixpkgs/lib/lists.nix:24:19':
while evaluating `fold'' at `/root/hack/nixpkgs/lib/lists.nix:27:15':
while evaluating an anonymous function at
`/root/hack/nixpkgs/lib/strings.nix:14:32':
while evaluating `fold'' at `/root/hack/nixpkgs/lib/lists.nix:27:15':
while evaluating an anonymous function at
`/root/hack/nixpkgs/lib/strings.nix:14:32':
while evaluating the builtin function `elemAt':
while evaluating an anonymous function at
`/root/hack/nixos/modules/services/system/dbus.nix:45:6':
while evaluating the attribute `outPath' at
`/nix/store/837scsdsdrlp49xv79ivrc5fbnfm6rrm-nix-1.6/share/nix/corepkgs/derivation.nix:18:9':
while evaluating the builtin function `getAttr':
while evaluating the builtin function `derivationStrict':
while instantiating the derivation named `system-path' at
`/root/hack/nixpkgs/pkgs/build-support/trivial-builders.nix:10:14':
while evaluating the derivation attribute `paths' at
`/root/hack/nixpkgs/pkgs/build-support/buildenv/default.nix:29:12':
while evaluating the attribute `outPath' at
`/nix/store/837scsdsdrlp49xv79ivrc5fbnfm6rrm-nix-1.6/share/nix/corepkgs/derivation.nix:18:9':
while evaluating the builtin function `getAttr':
while evaluating the builtin function `derivationStrict':
while instantiating the derivation named `nixos-manpages' at
`/root/hack/nixos/doc/manual/default.nix:72:5':
while evaluating the derivation attribute `buildCommand' at
`/root/hack/nixos/doc/manual/default.nix:78:5':
while evaluating the attribute `outPath' at
`/nix/store/837scsdsdrlp49xv79ivrc5fbnfm6rrm-nix-1.6/share/nix/corepkgs/derivation.nix:18:9':
while evaluating the builtin function `getAttr':
while evaluating the builtin function `derivationStrict':
while instantiating the derivation named `options-db.xml' at
`/root/hack/nixpkgs/pkgs/build-support/trivial-builders.nix:10:14':
while evaluating the derivation attribute `buildCommand' at
`/root/hack/nixpkgs/pkgs/build-support/trivial-builders.nix:10:14':
while evaluating the builtin function `toFile':
while evaluating the builtin function `unsafeDiscardStringContext':
while evaluating the builtin function `toXML':
attempt to call something which is not a function but a list

[root at nixos-pro:~/hack]#

-- 
Sincerely,
Andrey Rogozhin,