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README.md Simplify Setup of Nix and flakes and docker image creation instructions

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Signed-off-by: Thierry Laurion <insurgo@riseup.net>
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Thierry Laurion 2024-05-10 15:44:34 -04:00
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@ -39,36 +39,21 @@ Under QubesOS?
Build docker from nix develop layer locally
====
If you do not use Nix on a daily basis:
```
# DANGER: remove /nix store and recreates a fresh one. Skip if you use Nix already:
sudo rm -rf /nix/* || echo "cannot delete /nix" && sh <(curl -L https://nixos.org/nix/install) --no-daemon
# Configure nix for local builds for nix-commands and flakes usage under nix which are considered experimental features
mkdir -p ~/.config/nix
echo 'experimental-features = nix-command flakes' >~/.config/nix/nix.conf
# Source nix prior of anything else:
. /home/user/.nix-profile/etc/profile.d/nix.sh
```
#### Set up Nix and flakes
If you use Nix on a daily basis:
```
# Make sure your nix setup supports both nix-command and flakes experimental features:
mkdir -p ~/.config/nix
echo 'experimental-features = nix-command flakes' >> ~/.config/nix/nix.conf
# Review ~/.config/nix/nix.conf for inconsistencies in your favorite editor (vim, vi, gedit etc)
# Build nix developer local env with flakes locks to specified versions and exits just running "true" command:
nix --print-build-logs --verbose develop --ignore-environment --command true
# Build docker image with current develop created environment (this will take a while and create "linuxboot/heads:dev-env" local docker image:
nix build .#dockerImage && docker load < result
```
* If you don't already have Nix, install it:
* `[ -d /nix ] || sh <(curl -L https://nixos.org/nix/install) --no-daemon`
* `. /home/user/.nix-profile/etc/profile.d/nix.sh`
* Enable flake support in nix
* `mkdir -p ~/.config/nix`
* `echo 'experimental-features = nix-command flakes' >>~/.config/nix/nix.conf`
Common steps to follow to build local doscker image from nix develop environment:
```
# Build nix developer local env with flakes locks to specified versions and exits just running "true" command:
nix --print-build-logs --verbose develop --ignore-environment --command true
# Build docker image with current develop created environment (this will take a while and create "linuxboot/heads:dev-env" local docker image:
nix build .#dockerImage && docker load < result
```
#### Build image
* Build nix developer local environment with flakes locked to specified versions
* `nix --print-build-logs --verbose develop --ignore-environment --command true`
* Build docker image with current develop created environment (this will take a while and create "linuxboot/heads:dev-env" local docker image:
* `nix build .#dockerImage && docker load < result`
Done!