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fish config for loading nix in non-nixos
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Noah Masur
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137
fish.configlink/conf.d/nix-env.fish
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137
fish.configlink/conf.d/nix-env.fish
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# Setup Nix
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# We need to distinguish between single-user and multi-user installs.
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# This is difficult because there's no official way to do this.
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# We could look for the presence of /nix/var/nix/daemon-socket/socket but this will fail if the
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# daemon hasn't started yet. /nix/var/nix/daemon-socket will exist if the daemon has ever run, but
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# I don't think there's any protection against accidentally running `nix-daemon` as a user.
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# We also can't just look for /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh because
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# older single-user installs used the default profile instead of a per-user profile.
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# We can still check for it first, because all multi-user installs should have it, and so if it's
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# not present that's a pretty big indicator that this is a single-user install. If it does exist,
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# we still need to verify the install type. To that end we'll look for a root owner and sticky bit
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# on /nix/store. Multi-user installs set both, single-user installs don't. It's certainly possible
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# someone could do a single-user install as root and then manually set the sticky bit but that
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# would be extremely unusual.
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set -l nix_profile_path /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
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set -l single_user_profile_path ~/.nix-profile/etc/profile.d/nix.sh
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if test -e $nix_profile_path
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# The path exists. Double-check that this is a multi-user install.
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# We can't just check for ~/.nix-profile/… because this may be a single-user install running as
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# the wrong user.
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# stat is not portable. Splitting the output of ls -nd is reliable on most platforms.
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set -l owner (string split -n ' ' (command ls -nd /nix/store 2>/dev/null))[3]
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if not test -k /nix/store -a $owner -eq 0
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# /nix/store is either not owned by root or not sticky. Assume single-user.
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set nix_profile_path $single_user_profile_path
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end
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else
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# The path doesn't exist. Assume single-user
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set nix_profile_path $single_user_profile_path
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end
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if test -e $nix_profile_path
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# Source the nix setup script
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# We're going to run the regular Nix profile under bash and then print out a few variables
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for line in (command env -u BASH_ENV bash -c '. "$0"; for name in PATH "${!NIX_@}"; do printf "%s=%s\0" "$name" "${!name}"; done' $nix_profile_path | string split0)
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set -xg (string split -m 1 = $line)
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end
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# Insert Nix's fish share directories into fish's special variables.
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# nixpkgs-installed fish tries to set these up already if NIX_PROFILES is defined, which won't
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# be the case when sourcing $__fish_data_dir/share/config.fish normally, but might be for a
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# recursive invocation. To guard against that, we'll only insert paths that don't already exit.
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# Furthermore, for the vendor_conf.d sourcing, we'll use the pre-existing presence of a path in
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# $fish_function_path to determine whether we want to source the relevant vendor_conf.d folder.
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# To start, let's locally define NIX_PROFILES if it doesn't already exist.
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set -al NIX_PROFILES
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if test (count $NIX_PROFILES) -eq 0
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set -a NIX_PROFILES $HOME/.nix-profile
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end
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# Replicate the logic from nixpkgs version of $__fish_data_dir/__fish_build_paths.fish.
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set -l __nix_profile_paths (string split ' ' -- $NIX_PROFILES)[-1..1]
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set -l __extra_completionsdir \
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$__nix_profile_paths/etc/fish/completions \
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$__nix_profile_paths/share/fish/vendor_completions.d
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set -l __extra_functionsdir \
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$__nix_profile_paths/etc/fish/functions \
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$__nix_profile_paths/share/fish/vendor_functions.d
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set -l __extra_confdir \
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$__nix_profile_paths/etc/fish/conf.d \
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$__nix_profile_paths/share/fish/vendor_conf.d
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### Configure fish_function_path ###
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# Remove any of our extra paths that may already exist.
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# Record the equivalent __extra_confdir path for any function path that exists.
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set -l existing_conf_paths
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for path in $__extra_functionsdir
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if set -l idx (contains --index -- $path $fish_function_path)
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set -e fish_function_path[$idx]
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set -a existing_conf_paths $__extra_confdir[(contains --index -- $path $__extra_functionsdir)]
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end
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end
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# Insert the paths before $__fish_data_dir.
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if set -l idx (contains --index -- $__fish_data_dir/functions $fish_function_path)
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# Fish has no way to simply insert into the middle of an array.
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set -l new_path $fish_function_path[1..$idx]
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set -e new_path[$idx]
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set -a new_path $__extra_functionsdir
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set fish_function_path $new_path $fish_function_path[$idx..-1]
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else
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set -a fish_function_path $__extra_functionsdir
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end
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### Configure fish_complete_path ###
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# Remove any of our extra paths that may already exist.
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for path in $__extra_completionsdir
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if set -l idx (contains --index -- $path $fish_complete_path)
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set -e fish_complete_path[$idx]
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end
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end
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# Insert the paths before $__fish_data_dir.
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if set -l idx (contains --index -- $__fish_data_dir/completions $fish_complete_path)
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set -l new_path $fish_complete_path[1..$idx]
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set -e new_path[$idx]
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set -a new_path $__extra_completionsdir
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set fish_complete_path $new_path $fish_complete_path[$idx..-1]
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else
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set -a fish_complete_path $__extra_completionsdir
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end
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### Source conf directories ###
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# The built-in directories were already sourced during shell initialization.
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# Any __extra_confdir that came from $__fish_data_dir/__fish_build_paths.fish was also sourced.
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# As explained above, we're using the presence of pre-existing paths in $fish_function_path as a
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# signal that the corresponding conf dir has also already been sourced.
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# In order to simulate this, we'll run through the same algorithm as found in
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# $__fish_data_dir/config.fish except we'll avoid sourcing the file if it comes from an
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# already-sourced location.
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# Caveats:
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# * Files will be sourced in a different order than we'd ideally do (because we're coming in
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# after the fact to source them).
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# * If there are existing extra conf paths, files in them may have been sourced that should have
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# been suppressed by paths we're inserting in front.
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# * Similarly any files in $__fish_data_dir/vendor_conf.d that should have been suppressed won't
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# have been.
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set -l sourcelist
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for file in $__fish_config_dir/conf.d/*.fish $__fish_sysconf_dir/conf.d/*.fish
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# We know these paths were sourced already. Just record them.
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set -l basename (string replace -r '^.*/' '' -- $file)
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contains -- $basename $sourcelist
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or set -a sourcelist $basename
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end
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for root in $__extra_confdir
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for file in $root/*.fish
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set -l basename (string replace -r '^.*/' '' -- $file)
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contains -- $basename $sourcelist
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and continue
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set -a sourcelist $basename
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contains -- $root $existing_conf_paths
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and continue # this is a pre-existing path, it will have been sourced already
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[ -f $file -a -r $file ]
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and source $file
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end
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end
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end
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