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| == Alternative Install Methods ==
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| === Install Nix without root permissions ===
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| By using [https://github.com/lethalman/nix-user-chroot nix-user-chroot] or [https://github.com/proot-me/PRoot PRoot]
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| you can use Nix on systems, where you have no permission to create `/nix`.
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| <code>nix-user-chroot</code> is the preferred and faster option. However it might not run on older linux kernels
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| or kernels without user namespace support. With the following command you can test
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| whether your system support user namespaces:
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| <syntaxHighlight lang="console">
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| $ unshare --user --pid echo YES
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| </syntaxHighlight>
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| The output should be <code>YES</code>.
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| If the command is absent an alternative is to check the kernel compile options.
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| <syntaxHighlight lang="console">
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| $ zgrep CONFIG_USER_NS /proc/config.gz
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| # On some systems like Debian or Ubuntu the kernel configuration is in a different place
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| $ grep CONFIG_USER_NS /boot/config-$(uname -r)
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| </syntaxHighlight>
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| If the output of this command is <code>CONFIG_USER_NS=y</code> your system supports user namespaces.
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| ==== nix-user-chroot ====
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| <code>nix-user-chroot</code> will create an environment, in which you can bind mount an directory to <code>/nix</code>.
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| The mountpoint will be only visible within this environment.
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| <code>nix-user-chroot</code> can be build the following way. This assumes a c compiler and make is installed.
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| <syntaxHighlight lang="console">
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| $ git clone https://github.com/lethalman/nix-user-chroot.git
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| $ cd nix-user-chroot
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| $ make
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| </syntaxHighlight>
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| The last step created an executable called <code>nix-user-chroot</code>.
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| <code>nix-user-chroot</code> can be used to install nix.
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| In this example the nix store will be installed to <code>~/.nix</code>:
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| <syntaxHighlight lang="console">
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| $ mkdir -m 0755 ~/.nix
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| $ ./nix-user-chroot/nix-user-chroot ~/.nix bash
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| </syntaxHighlight>
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| This will start a new shell in which you can run the install script of nix:
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| <syntaxHighlight lang="console">
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| $ curl https://nixos.org/nix/install | sh
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| </syntaxHighlight>
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| Note that you can only use nix and the installed programs within the shell started by <code>nix-user-chroot</code>.
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| ==== PRoot ====
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| Precompiled PRoot binaries can be downloaded from [https://github.com/proot-me/proot-static-build/releases here]
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| The following commands will install nix the nix store to <code>~/.nix</code>
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| <syntaxHighlight lang="console">
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| $ chmod +x proot_5.1.1_x86_64_rc2--no-seccomp # first make sure the executable bit is set on the binary
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| $ mkdir ~/.nix
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| $ ./proot_5.1.1_x86_64_rc2--no-seccomp ~/.nix
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| </syntaxHighlight>
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| This will start a new shell, where nix can be installed:
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| <syntaxHighlight lang="console">
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| $ curl https://nixos.org/nix/install | sh
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| </syntaxHighlight>
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| Note that you can only use nix and the installed programs within the shell started by PRoot.
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