The nixos-configuration.nix from pedroregispoar

Things to be documented

Installation

Really useful:
https://releases.nixos.org/?prefix=nixos/22.05/

TODO: Part 0, could merge the injection of the flag --extra-experimental-features 'nix-command flakes'

Part 1: should work in almost every place, only needed nix CLI working (tested it in Ubuntu 20.04)

nix --extra-experimental-features 'nix-command flakes' shell nixpkgs#wget nixpkgs#coreutils

Part 2: downloading some fixed/pinned url's NixOS ISO and testing its sha256sum

wget https://releases.nixos.org/nixos/22.05/nixos-22.05.1460.9e96b1562d6/nixos-plasma5-22.05.1460.9e96b1562d6-x86_64-linux.iso

wget https://releases.nixos.org/nixos/22.05/nixos-22.05.1460.9e96b1562d6/nixos-plasma5-22.05.1460.9e96b1562d6-x86_64-linux.iso.sha256
cat nixos-plasma5-22.05.1460.9e96b1562d6-x86_64-linux.iso.sha256 | sha256sum -c

Part 3: making an bootable flash drive/USB stick

# nix --extra-experimental-features 'nix-command flakes' run nixpkgs#etcher
NIXPKGS_ALLOW_INSECURE=1 nix --extra-experimental-features 'nix-command flakes' run nixpkgs#etcher --impure

From:

Part 4: install it using the Calamares graphical installer

Part 5: after the install just copy paste

nix \
--extra-experimental-features 'nix-command flakes' \
profile \
install \
nixpkgs#gitMinimal


test -f "$HOME"/.gitconfig || { cat << EOF > "$HOME"/.gitconfig
[user]
    name = Pedro O. A. Regis
    email = [email protected]
EOF
} && git config --list \
&& git config user.name \
&& git config user.email


sudo cp -r /etc/nixos/ /etc/nixos-backup \
&& sudo rm -f /etc/nixos/{configuration.nix,hardware-configuration.nix} \
&& sudo chown "$(id -u)":"$(id -g)" -R /etc/nixos \
&& nix \
flake \
--extra-experimental-features 'nix-command flakes' \
clone \
github:PedroRegisPOAR/NixOS-configuration.nix \
--dest /etc/nixos/


# TODO: explain this magic
cd /etc/nixos/ \
&& git remote set-url origin $(git remote show origin | grep "Fetch URL" | sed 's/ *Fetch URL: //' | sed 's/https:\/\/github.com\//[email protected]:/')

# nix \
# build \
# github:PedroRegisPOAR/NixOS-configuration.nix#nixosConfigurations.pedroregispoar.config.system.build.toplevel
# 
# TODO: study
# sudo nixos-rebuild boot --install-bootloader --flake '/etc/nixos#pedroregispoar'

cd /etc/nixos/ \
&& git checkout nixos-22.05 \
&& cp -f /etc/nixos-backup/hardware-configuration.nix /etc/nixos/  \
&& git add hardware-configuration.nix \
&& git commit -m 'Adds newly created hardware-configuration.nix'

sudo \
-E \
su \
-p \
-c \
"
nixos-rebuild test --flake '/etc/nixos#pedroregispoar' \
&& nixos-rebuild switch --flake '/etc/nixos#pedroregispoar' \
&& reboot
"

Once I got this erros, and I was willing to save time, so pressed Ctrl + c:

[sudo] password for pedro: 
Cloning into '/etc/nixos'...
remote: Enumerating objects: 659, done.
remote: Counting objects: 100% (145/145), done.
remote: Compressing objects: 100% (99/99), done.
remote: Total 659 (delta 93), reused 98 (delta 46), pack-reused 514
Receiving objects: 100% (659/659), 102.59 KiB | 1.07 MiB/s, done.
Resolving deltas: 100% (405/405), done.
branch 'nixos-22.05' set up to track 'origin/nixos-22.05'.
Switched to a new branch 'nixos-22.05'
[nixos-22.05 d0584dd] Adds newly created hardware-configuration.nix
 1 file changed, 2 insertions(+), 2 deletions(-)
building the system configuration...
warning: error: unable to download 'https://cache.nixos.org/nar/0b2vvkawcb1xx2kczi8yjj9bkm4rsgbqzw6673jn2a2xlyarai46.nar.xz': HTTP error 200 ('') (curl error: Timeout was reached); retrying from offset 35651584 in 346 ms
warning: error: unable to download 'https://cache.nixos.org/nar/10j3b9c6r4qxhrzwynm7x6xj9f6phm5w4gqdxb23y8q4140dccbf.nar.xz': HTTP error 200 ('') (curl error: Timeout was reached); retrying from offset 5214729 in 251 ms
warning: error: unable to download 'https://cache.nixos.org/nar/0szhzmbj0bhpnbm7nsgrxsbk7hyp7zpm75jvzys7ihkacahhsckw.nar.xz': HTTP error 200 ('') (curl error: Timeout was reached); retrying from offset 4620279 in 290 ms
warning: error: unable to download 'https://cache.nixos.org/nar/1rx22qyn2hq5lq3xy2zkvydqdh6wmcavqa6yj30hqc7ks1b0snck.nar.xz': HTTP error 200 ('') (curl error: Timeout was reached); retrying from offset 1245184 in 325 ms
warning: error: unable to download 'https://cache.nixos.org/nar/10j3b9c6r4qxhrzwynm7x6xj9f6phm5w4gqdxb23y8q4140dccbf.nar.xz': Timeout was reached (28); retrying from offset 5214729 in 695 ms
warning: error: unable to download 'https://cache.nixos.org/nar/0szhzmbj0bhpnbm7nsgrxsbk7hyp7zpm75jvzys7ihkacahhsckw.nar.xz': Timeout was reached (28); retrying from offset 4620279 in 527 ms
warning: error: unable to download 'https://cache.nixos.org/nar/1rx22qyn2hq5lq3xy2zkvydqdh6wmcavqa6yj30hqc7ks1b0snck.nar.xz': Timeout was reached (28); retrying from offset 1245184 in 595 ms
warning: error: unable to download 'https://cache.nixos.org/nar/0b2vvkawcb1xx2kczi8yjj9bkm4rsgbqzw6673jn2a2xlyarai46.nar.xz': Timeout was reached (28); retrying from offset 35651584 in 677 ms
warning: error: unable to download 'https://cache.nixos.org/nar/0szhzmbj0bhpnbm7nsgrxsbk7hyp7zpm75jvzys7ihkacahhsckw.nar.xz': Timeout was reached (28); retrying from offset 4620279 in 1057 ms
warning: error: unable to download 'https://cache.nixos.org/nar/10j3b9c6r4qxhrzwynm7x6xj9f6phm5w4gqdxb23y8q4140dccbf.nar.xz': Timeout was reached (28); retrying from offset 5214729 in 1362 ms
warning: error: unable to download 'https://cache.nixos.org/nar/1rx22qyn2hq5lq3xy2zkvydqdh6wmcavqa6yj30hqc7ks1b0snck.nar.xz': Timeout was reached (28); retrying from offset 1245184 in 1178 ms
warning: error: unable to download 'https://cache.nixos.org/nar/0b2vvkawcb1xx2kczi8yjj9bkm4rsgbqzw6673jn2a2xlyarai46.nar.xz': Timeout was reached (28); retrying from offset 35651584 in 1328 ms
[0/770 built, 4/97/1558 copied (255.6/11625.5 MiB), 44.6/3713.1 MiB DL] fetching font-adobe-75dpi-1.0.3 from https://cache.nixos.org^C
error: interrupted by the user

And re run the last command.

Part 6: after the reboot, lets generate an new key to be able to use git via ssh

Note: considering having an flash drive bootable, backup and install from scratch
(github/some remote) is really magic.

For some really unknown reason the system just did not show up the interface any more, broken system.

I did not want to spend lots of time trying to figure out an hack way to recover the system. I did a boot
from this previously built flash drive and backup the "frozen" (actually read only file system)
from the just died system and a full re install.

command -v ssh-keygen || nix profile install nixpkgs#openssh
command -v git || nix profile install nixpkgs#git

ssh-keygen \
-t ed25519 \
-C "$(git config user.email)" \
-f "${HOME}"/.ssh/id_ed25519 \
-N '' \
&& echo \
&& cat "${HOME}"/.ssh/id_ed25519.pub \
&& echo

Go to:
https://github.com/settings/ssh/new

Optional, but recommended:

ssh -T -o ConnectTimeout=3 [email protected] &>/dev/null  
ssh -T -o ConnectTimeout=3 [email protected] &>/dev/null  
test $? -eq 1 || echo 'Error in ssh -T -o ConnectTimeout=3 [email protected]'

Part 7: removes the backup folder and push to the remote the new `hardware-configuration.nix`

sudo rm -fr /etc/nixos-backup

cd /etc/nixos/ \
&& git push

Troubleshooting

Am I booted in Legacy or UEFI?

[ -d /sys/firmware/efi/efivars ] && echo "UEFI" || echo "Legacy"

From: https://nixos.wiki/wiki/Bootloader

Not needed

nix \
--extra-experimental-features 'nix-command flakes' \
flake \
update \
--override-input nixpkgs github:NixOS/nixpkgs/nixos-22.05

nix \
--extra-experimental-features 'nix-command flakes' \
flake \
update \
--override-input nixpkgs github:SuperSandro2000/nixpkgs/i18n-always-c

https://www.youtube.com/watch?v=aeDbYuJyXr8&t=43s

nix \
--extra-experimental-features 'nix-command flakes' \
build \
github:PedroRegisPOAR/NixOS-configuration.nix/nixos-22.05#nixosConfigurations.pedroregispoar.config.system.build.toplevel

I was being hitted by a really annoying permission denied error.

Solution:

sudo chown --recursive pedro  /etc/nixos

Generalise?

sudo chown --recursive "$USER" /etc/nixos

nix \
build \
github:PedroRegisPOAR/NixOS-configuration.nix#nixosConfigurations.pedroregispoar.config.system.build.toplevel

https://github.com/tfc/nixos-offline-installer#how-to-test-in-qemu

https://search.nixos.org/options?channel=22.05&show=system.copySystemConfiguration&from=0&size=50&sort=relevance&type=packages&query=copySystemConfiguration

https://discourse.nixos.org/t/declarative-kde-configuration/15901/5

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Hi there 👋, I am Pedro Regis

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