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<a href=/index.xml target=_blank>RSS</a></nav></header><main role=main><article itemtype=http://schema.org/Article><h1 itemtype=headline>Development environments with Nix</h1><p><cap>note</cap>, Jun 25, 2023 on <a href=https://mitjafelicijan.com>Mitja Felicijan's blog</a><div><p>Nix is amazing for making reproducible cross OS development environment.<p>First you need to <a href=https://nixos.org/download.html>install Nix package
manager</a>.<ul><li>Create a file <code>shell.nix</code> in your project folder.<li>In the section that has <code>python3</code> etc add programs you want to use. These can
be CLI or GUI applications. It doesn't matter to Nix.</ul><pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span>{ pkgs ? <span style=color:#00f>import</span> <span style=color:#a31515>&lt;nixpkgs&gt;</span> {} }:
</span></span><span style=display:flex><span>  pkgs.mkShell {
</span></span><span style=display:flex><span>    nativeBuildInputs = <span style=color:#00f>with</span> pkgs.buildPackages; [
</span></span><span style=display:flex><span>	  python3
</span></span><span style=display:flex><span>	  tinycc
</span></span><span style=display:flex><span>	];
</span></span><span style=display:flex><span>}
</span></span></code></pre><p>And then run it <code>nix-shell</code>. By default it will look for <code>shell.nix</code> file. If
you want to specify a different file use <code>nix-shell file.nix</code>. That is about it.<p>When the shell is spawned it could happen that your <code>PS1</code> prompt will be
overwritten and your prompt will look differently. In that case you need to
either do <code>NIX_SHELL_PRESERVE_PROMPT=1 nix shell</code> or add
<code>NIX_SHELL_PRESERVE_PROMPT</code> variable to your <code>bashrc</code> or <code>zshrc</code> file and set it
to <code>1</code>.<p>I also have a modified <code>PS1</code> prompt for Bash that I use and it also catches the
usage of Nix shell.<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span>NIX_SHELL_PRESERVE_PROMPT=1
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span>parse_git_branch() {
</span></span><span style=display:flex><span>	git branch 2&gt; /dev/null | sed -e <span style=color:#a31515>&#39;/^[^*]/d&#39;</span> -e <span style=color:#a31515>&#39;s/* \(.*\)/ (\1)/&#39;</span>
</span></span><span style=display:flex><span>}
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span>is_inside_nix_shell() {
</span></span><span style=display:flex><span>	nix_shell_name=<span style=color:#a31515>&#34;</span><span style=color:#00f>$(</span>basename <span style=color:#a31515>&#34;</span>$IN_NIX_SHELL<span style=color:#a31515>&#34;</span> 2&gt;/dev/null<span style=color:#00f>)</span><span style=color:#a31515>&#34;</span>
</span></span><span style=display:flex><span>	<span style=color:#00f>if</span> [[ -n <span style=color:#a31515>&#34;</span>$nix_shell_name<span style=color:#a31515>&#34;</span> ]]; <span style=color:#00f>then</span>
</span></span><span style=display:flex><span>		echo <span style=color:#a31515>&#34; \e[0;36m(nix-shell)\e[0m&#34;</span>
</span></span><span style=display:flex><span>	<span style=color:#00f>fi</span>
</span></span><span style=display:flex><span>}
</span></span><span style=display:flex><span>
</span></span><span style=display:flex><span>export PS1=<span style=color:#a31515>&#34;[\033[38;5;9m\]\u@\h\[</span><span style=color:#00f>$(</span>tput sgr0<span style=color:#00f>)</span><span style=color:#a31515>\]]</span><span style=color:#00f>$(</span>is_inside_nix_shell<span style=color:#00f>)</span><span style=color:#a31515>\[\033[33m\]\$(parse_git_branch)\[\033[00m\] \w\[</span><span style=color:#00f>$(</span>tput sgr0<span style=color:#00f>)</span><span style=color:#a31515>\] \n</span>$<span style=color:#a31515> &#34;</span>
</span></span></code></pre><p>And this is what it looks like when you are in a Nix shell. Otherwise that part
of prompt is omitted<figure><img src=/notes/ps1-prompt.png alt="PS1 Prompt"></figure><p>More resources:<ul><li><a href=https://nixos.wiki/wiki/Development_environment_with_nix-shell>https://nixos.wiki/wiki/Development_environment_with_nix-shell</a><li><a href=https://nixos.wiki/wiki/Main_Page>https://nixos.wiki/wiki/Main_Page</a><li><a href=https://itsfoss.com/why-use-nixos/>https://itsfoss.com/why-use-nixos/</a><li><a href=https://mynixos.com/>https://mynixos.com/</a></ul></div></div></main><section><hr><h2>Posts from blogs I follow around the net</h2><ul><li><a href=https://chotrin.org/writing/2023-10-29.html target=_blank rel=noopener>even more bike things.</a><div>I wrote about all sorts of biking and not-biking things in my life this week. — <a href=https://chotrin.org>chötrin's wiki.</a><li><a href="http://offbeatpursuit.com:80/blog/?id=25" target=_blank rel=noopener>A fix by any other name</a><div>tags:
i2c, plan9
Another month, another file system.
Well, if you can’t fix it in software, fix it in hardware (looking at
you, bme680, we’re not
done yet). The show mu… — <a href=http://offbeatpursuit.com:80/blog/>WLOG - blog</a><li><a href=https://mirzapandzo.com/next-image-url-parameter-is-valid-but-upstream-response-is-invalid target=_blank rel=noopener>Next/Image "url" parameter is valid but upstream response is invalid</a><div>Getting "url" parameter is valid but upstream response is invalid error with Next/Image on WSL2 — <a href=https://mirzapandzo.com/>Mirza Pandzo's Blog</a><li><a href=https://drewdevault.com/2023/10/13/Going-off-script.html target=_blank rel=noopener>Going off-script</a><div>There is a phenomenon in society which I find quite bizarre. Upon our entry to
this mortal coil, we are endowed with self-awareness, agency, and free will.
Each of th… — <a href=https://drewdevault.com>Drew DeVault's blog</a><li><a href=https://solar.lowtechmagazine.com/2023/10/thematic-book-series-how-to-downsize-a-transport-network/ target=_blank rel=noopener>Thematic Book Series: How to Downsize a Transport Network?</a><div>Image: Book cover. [How to downsize a transport network?](https://www.lulu.com/shop/kris-de-decker/how-to-downsize-a-transport-network/paperback/product-42n4p7.htm… — <a href=https://solar.lowtechmagazine.com/posts/>LOW←TECH MAGAZINE English</a><li><a href=https://neil.computer/notes/chart-of-accounts-for-startups-and-saas-companies/ target=_blank rel=noopener>Chart of Accounts for Startups and SaaS Companies</a><div>Accounting is fundamental to starting a business. You need to have a basic understanding of accounting principles and essential bookkeeping. I had to learn it. Ther… — <a href=https://neil.computer/>Neil Panchal</a><li><a href=https://journal.valeriansaliou.name/deploy-a-nomad-cluster-on-alpine-linux-with-vultr/ target=_blank rel=noopener>Deploy a Nomad Cluster on Alpine Linux with Vultr</a><div>After spending countless hours trying to understand how to deploy my apps on Kubernetes for the first time to host Mirage, an AI API service that I run, I ended up … — <a href=https://journal.valeriansaliou.name/>Valerian Saliou</a><li><a href=https://jcs.org/2023/10/25/wifi_da target=_blank rel=noopener>BlueSCSI Wi-Fi Desk Accessory 1.0 Released</a><div>BlueSCSI Wi-Fi Desk Accessory
1.0 has been released:
wifi_da-1.0.sit
(StuffIt 3 archive)
SHA256: ccfc9d27dd5da7412d10cef73b81119a1fec3848e4d1d88ff652a07ffdc6a69aSHA1:… — <a href=https://jcs.org/>joshua stein</a></ul><p><a href=https://git.sr.ht/~sircmpwn/openring>Generated with openring.</a></section><footer><hr><p><big><strong>Want to comment or have something to add?</strong></big><p>You can write me an email
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