90 lines
3.2 KiB
XML
90 lines
3.2 KiB
XML
<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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version="5.0"
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xml:id="ch-env-variables">
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<title>Environment Variables</title>
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<para>To use Nix, some environment variables should be set. In
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particular, <envar>PATH</envar> should contain the directories
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<filename><replaceable>prefix</replaceable>/bin</filename> and
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<filename>~/.nix-profile/bin</filename>. The first directory contains
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the Nix tools themselves, while <filename>~/.nix-profile</filename> is
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a symbolic link to the current <emphasis>user environment</emphasis>
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(an automatically generated package consisting of symlinks to
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installed packages). The simplest way to set the required environment
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variables is to include the file
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<filename><replaceable>prefix</replaceable>/etc/profile.d/nix.sh</filename>
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in your <filename>~/.profile</filename> (or similar), like this:</para>
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<screen>
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source <replaceable>prefix</replaceable>/etc/profile.d/nix.sh</screen>
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<section xml:id="sec-nix-ssl-cert-file">
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<title><envar>NIX_SSL_CERT_FILE</envar></title>
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<para>If you need to specify a custom certificate bundle to account
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for an HTTPS-intercepting man in the middle proxy, you must specify
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the path to the certificate bundle in the environment variable
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<envar>NIX_SSL_CERT_FILE</envar>.</para>
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<para>If you don't specify a <envar>NIX_SSL_CERT_FILE</envar>
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manually, Nix will install and use its own certificate
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bundle.</para>
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<procedure>
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<step><para>Set the environment variable and install Nix</para>
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<screen>
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$ export NIX_SSL_CERT_FILE=/etc/ssl/my-certificate-bundle.crt
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$ sh <(curl https://nixos.org/nix/install)
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</screen></step>
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<step><para>In the shell profile and rc files (for example,
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<filename>/etc/bashrc</filename>, <filename>/etc/zshrc</filename>),
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add the following line:</para>
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<programlisting>
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export NIX_SSL_CERT_FILE=/etc/ssl/my-certificate-bundle.crt
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</programlisting>
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</step>
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</procedure>
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<note><para>You must not add the export and then do the install, as
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the Nix installer will detect the presense of Nix configuration, and
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abort.</para></note>
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<section xml:id="sec-nix-ssl-cert-file-with-nix-daemon-and-macos">
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<title><envar>NIX_SSL_CERT_FILE</envar> with macOS and the Nix daemon</title>
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<para>On macOS you must specify the environment variable for the Nix
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daemon service, then restart it:</para>
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<screen>
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$ sudo launchctl setenv NIX_SSL_CERT_FILE /etc/ssl/my-certificate-bundle.crt
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$ sudo launchctl kickstart -k system/org.nixos.nix-daemon
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</screen>
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</section>
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<section xml:id="sec-installer-proxy-settings">
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<title>Proxy Environment Variables</title>
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<para>The Nix installer has special handling for these proxy-related
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environment variables:
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<varname>http_proxy</varname>, <varname>https_proxy</varname>,
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<varname>ftp_proxy</varname>, <varname>no_proxy</varname>,
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<varname>HTTP_PROXY</varname>, <varname>HTTPS_PROXY</varname>,
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<varname>FTP_PROXY</varname>, <varname>NO_PROXY</varname>.
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</para>
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<para>If any of these variables are set when running the Nix installer,
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then the installer will create an override file at
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<filename>/etc/systemd/system/nix-daemon.service.d/override.conf</filename>
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so <command>nix-daemon</command> will use them.
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</para>
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</section>
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</section>
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</chapter>
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