https://buildx.sh/tags/direnv/Recent content in Direnv on buildx.shHugoen© buildx.sh — built with effect, performance, and funSat, 09 May 2026 00:00:00 +0000https://buildx.sh/snippets/nix-flake-dev-shell-with-direnv/Sat, 09 May 2026 00:00:00 +0000https://buildx.sh/snippets/nix-flake-dev-shell-with-direnv/<p>A project&rsquo;s tools should appear when you enter its directory and vanish when you leave. <code>direnv</code> + <code>nix-direnv</code> does exactly that — this <code>.envrc</code> loads a named flake dev shell on <code>cd</code>.</p> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span><span style="color:#75715e"># .envrc — auto-load a named Nix flake dev shell.</span> </span></span><span style="display:flex;"><span><span style="color:#75715e"># Needs direnv + nix-direnv: https://github.com/nix-community/nix-direnv</span> </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span><span style="color:#66d9ef">if</span> ! has nix_direnv_version <span style="color:#f92672">||</span> ! nix_direnv_version 3.0.0; <span style="color:#66d9ef">then</span> </span></span><span style="display:flex;"><span> source_url <span style="color:#e6db74">&#34;https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.0/direnvrc&#34;</span> <span style="color:#ae81ff">\ </span></span></span><span style="display:flex;"><span><span style="color:#ae81ff"></span> <span style="color:#e6db74">&#34;sha256-21TMnI2xWX7HkSTjFFri2UaohXVj854mgvWapWrxRXg=&#34;</span> </span></span><span style="display:flex;"><span><span style="color:#66d9ef">fi</span> </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span><span style="color:#75715e"># Loads devShells.&lt;system&gt;.myshell — drop the suffix for the default shell.</span> </span></span><span style="display:flex;"><span>use flake .#myshell </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span><span style="color:#75715e"># Untracked local overrides, if any.</span> </span></span><span style="display:flex;"><span><span style="color:#f92672">[</span> -f .envrc.local <span style="color:#f92672">]</span> <span style="color:#f92672">&amp;&amp;</span> source_env .envrc.local </span></span></code></pre></div><p>Run <code>direnv allow</code> once; after that the shell rebuilds itself whenever <code>flake.nix</code> changes.</p>