nixpkgs/nixos/modules/programs/shell.nix

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# This module defines a standard configuration for NixOS shells.
{ config, lib, ... }:
with lib;
{
config = {
environment.shellAliases =
{ ls = "ls --color=tty";
ll = "ls -l";
l = "ls -alh";
};
environment.shellInit =
''
# Set up the per-user profile.
mkdir -m 0755 -p "$NIX_USER_PROFILE_DIR"
if [ "$(stat --printf '%u' "$NIX_USER_PROFILE_DIR")" != "$(id -u)" ]; then
echo "WARNING: bad ownership on $NIX_USER_PROFILE_DIR, should be $(id -u)" >&2
fi
if [ -w "$HOME" ]; then
if ! [ -L "$HOME/.nix-profile" ]; then
if [ "$USER" != root ]; then
ln -s "$NIX_USER_PROFILE_DIR/profile" "$HOME/.nix-profile"
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else
# Root installs in the system-wide profile by default.
ln -s /nix/var/nix/profiles/default "$HOME/.nix-profile"
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fi
fi
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# Subscribe the root user to the NixOS channel by default.
if [ "$USER" = root -a ! -e "$HOME/.nix-channels" ]; then
echo "${config.system.defaultChannel} nixos" > "$HOME/.nix-channels"
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fi
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# Create the per-user garbage collector roots directory.
NIX_USER_GCROOTS_DIR="/nix/var/nix/gcroots/per-user/$USER"
mkdir -m 0755 -p "$NIX_USER_GCROOTS_DIR"
if [ "$(stat --printf '%u' "$NIX_USER_GCROOTS_DIR")" != "$(id -u)" ]; then
echo "WARNING: bad ownership on $NIX_USER_GCROOTS_DIR, should be $(id -u)" >&2
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fi
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# Set up a default Nix expression from which to install stuff.
if [ ! -e "$HOME/.nix-defexpr" -o -L "$HOME/.nix-defexpr" ]; then
rm -f "$HOME/.nix-defexpr"
mkdir -p "$HOME/.nix-defexpr"
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if [ "$USER" != root ]; then
ln -s /nix/var/nix/profiles/per-user/root/channels "$HOME/.nix-defexpr/channels_root"
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fi
fi
fi
'';
};
}