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1<!doctype html><html lang=en-us><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><link href="data:image/x-icon;base64,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" rel=icon type=image/x-icon><title>Development environments with Nix</title><meta name=description content="Nix is amazing for making reproducible cross OS development environment."><link rel=alternate type=application/rss+xml title="Mitja Felicijan's posts" href=https://mitjafelicijan.com/index.xml><link rel=alternate type=application/rss+xml title="Mitja Felicijan's notes" href=https://mitjafelicijan.com/notes.xml><style>body{padding:1rem;max-width:760px;background:#fff;font-family:times new roman,Times,serif;line-height:1.35rem}hr{margin-block-start:1.5rem}h1,h2,h3{line-height:initial}footer{margin-block-start:3rem}table{max-width:100%;border-collapse:separate;border-spacing:2px;border:1px solid #000;border-left:1px solid #999;border-top:1px solid #999}blockquote{font-style:italic}table thead{background:#eee}td,th{border:1px solid #000;padding:4px;border-right:1px solid #999;border-bottom:1px solid #999;text-align:left}pre{text-wrap:nowrap;overflow-x:auto;margin-block-start:1.5rem;margin-block-end:1.5rem;padding:.5rem 0;border-top:1px solid #000;border-bottom:1px solid #000}pre code{line-height:1.3em}pre,code,pre *,code *{font-family:monospace;font-size:initial!important}img,video,audio{max-width:100%}header{display:flex;flex-direction:row;gap:3rem}nav{display:flex;gap:.75rem}.pstatus-orange{background:gold}.pstatus-green{background:#9acd32}.pstatus-red{background:#cd5c5c}@media only screen and (max-width:600px){header{flex-direction:column;gap:1rem}a{word-wrap:break-word}}</style><header><nav class=main><a href=/>Home</a>
2<a href=https://git.mitjafelicijan.com/ target=_blank>Git</a>
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6<a href=/index.xml target=_blank>RSS</a></nav></header><main><div><h1>Development environments with Nix</h1><p>Jun 25, 2023<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
7manager</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
8be 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> {} }:
9</span></span><span style=display:flex><span> pkgs.mkShell {
10</span></span><span style=display:flex><span> nativeBuildInputs = <span style=color:#00f>with</span> pkgs.buildPackages; [
11</span></span><span style=display:flex><span> python3
12</span></span><span style=display:flex><span> tinycc
13</span></span><span style=display:flex><span> ];
14</span></span><span style=display:flex><span>}
15</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
16you 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
17overwritten and your prompt will look differently. In that case you need to
18either do <code>NIX_SHELL_PRESERVE_PROMPT=1 nix shell</code> or add
19<code>NIX_SHELL_PRESERVE_PROMPT</code> variable to your <code>bashrc</code> or <code>zshrc</code> file and set it
20to <code>1</code>.<p>I also have a modified <code>PS1</code> prompt for Bash that I use and it also catches the
21usage of Nix shell.<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span>NIX_SHELL_PRESERVE_PROMPT=1
22</span></span><span style=display:flex><span>
23</span></span><span style=display:flex><span>parse_git_branch() {
24</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>
25</span></span><span style=display:flex><span>}
26</span></span><span style=display:flex><span>
27</span></span><span style=display:flex><span>is_inside_nix_shell() {
28</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>
29</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>
30</span></span><span style=display:flex><span> echo <span style=color:#a31515>&#34; \e[0;36m(nix-shell)\e[0m&#34;</span>
31</span></span><span style=display:flex><span> <span style=color:#00f>fi</span>
32</span></span><span style=display:flex><span>}
33</span></span><span style=display:flex><span>
34</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>
35</span></span></code></pre><p>And this is what it looks like when you are in a Nix shell. Otherwise that part
36of prompt is omitted<p><img src=/notes/ps1-prompt.png alt="PS1 Prompt"><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><footer><hr><div><h3>Want to comment or have something to add?</h3>You can write me an email at
37<a href=mailto:m@mitjafelicijan.com>m@mitjafelicijan.com</a> or catch up
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