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author | Kane York <kanepyork@gmail.com> | 2020-11-26T22·04-0800 |
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committer | kanepyork <rikingcoding@gmail.com> | 2020-11-26T23·43+0000 |
commit | f2f3c4228d027a8ac47f9a70b3b99f57e4225c3e (patch) | |
tree | 3150364427f5862132bf4db69b053fc35179a2c4 /users/riking/dotfiles/fish | |
parent | 3328c23f35898a860c505b70280081d7c00ed358 (diff) |
feat(users/riking/fish): add nix-env to shell r/1922
Change-Id: Ic889506b8d4506093b4080d67e93cf9877916850 Reviewed-on: https://cl.tvl.fyi/c/depot/+/2153 Reviewed-by: kanepyork <rikingcoding@gmail.com> Tested-by: BuildkiteCI
Diffstat (limited to 'users/riking/dotfiles/fish')
-rw-r--r-- | users/riking/dotfiles/fish/conf.d/nix-env.fish | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/users/riking/dotfiles/fish/conf.d/nix-env.fish b/users/riking/dotfiles/fish/conf.d/nix-env.fish new file mode 100644 index 000000000000..6f79f9752855 --- /dev/null +++ b/users/riking/dotfiles/fish/conf.d/nix-env.fish @@ -0,0 +1,141 @@ +# SPDX-License-Identifier: Unlicense +# https://raw.githubusercontent.com/lilyball/nix-env.fish/master/conf.d/nix-env.fish + +# Setup Nix + +# We need to distinguish between single-user and multi-user installs. +# This is difficult because there's no official way to do this. +# We could look for the presence of /nix/var/nix/daemon-socket/socket but this will fail if the +# daemon hasn't started yet. /nix/var/nix/daemon-socket will exist if the daemon has ever run, but +# I don't think there's any protection against accidentally running `nix-daemon` as a user. +# We also can't just look for /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh because +# older single-user installs used the default profile instead of a per-user profile. +# We can still check for it first, because all multi-user installs should have it, and so if it's +# not present that's a pretty big indicator that this is a single-user install. If it does exist, +# we still need to verify the install type. To that end we'll look for a root owner and sticky bit +# on /nix/store. Multi-user installs set both, single-user installs don't. It's certainly possible +# someone could do a single-user install as root and then manually set the sticky bit but that +# would be extremely unusual. + +set -l nix_profile_path /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh +set -l single_user_profile_path ~/.nix-profile/etc/profile.d/nix.sh +if test -e $nix_profile_path + # The path exists. Double-check that this is a multi-user install. + # We can't just check for ~/.nix-profile/… because this may be a single-user install running as + # the wrong user. + + # stat is not portable. Splitting the output of ls -nd is reliable on most platforms. + set -l owner (string split -n ' ' (ls -nd /nix/store 2>/dev/null))[3] + if not test -k /nix/store -a $owner -eq 0 + # /nix/store is either not owned by root or not sticky. Assume single-user. + set nix_profile_path $single_user_profile_path + end +else + # The path doesn't exist. Assume single-user + set nix_profile_path $single_user_profile_path +end + +if test -e $nix_profile_path + # Source the nix setup script + # We're going to run the regular Nix profile under bash and then print out a few variables + for line in (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) + set -xg (string split -m 1 = $line) + end + + # Insert Nix's fish share directories into fish's special variables. + # nixpkgs-installed fish tries to set these up already if NIX_PROFILES is defined, which won't + # be the case when sourcing $__fish_data_dir/share/config.fish normally, but might be for a + # recursive invocation. To guard against that, we'll only insert paths that don't already exit. + # Furthermore, for the vendor_conf.d sourcing, we'll use the pre-existing presence of a path in + # $fish_function_path to determine whether we want to source the relevant vendor_conf.d folder. + + # To start, let's locally define NIX_PROFILES if it doesn't already exist. + set -al NIX_PROFILES + if test (count $NIX_PROFILES) -eq 0 + set -a NIX_PROFILES $HOME/.nix-profile + end + # Replicate the logic from nixpkgs version of $__fish_data_dir/__fish_build_paths.fish. + set -l __nix_profile_paths (string split ' ' -- $NIX_PROFILES)[-1..1] + set -l __extra_completionsdir \ + $__nix_profile_paths/etc/fish/completions \ + $__nix_profile_paths/share/fish/vendor_completions.d + set -l __extra_functionsdir \ + $__nix_profile_paths/etc/fish/functions \ + $__nix_profile_paths/share/fish/vendor_functions.d + set -l __extra_confdir \ + $__nix_profile_paths/etc/fish/conf.d \ + $__nix_profile_paths/share/fish/vendor_conf.d \ + + ### Configure fish_function_path ### + # Remove any of our extra paths that may already exist. + # Record the equivalent __extra_confdir path for any function path that exists. + set -l existing_conf_paths + for path in $__extra_functionsdir + if set -l idx (contains --index -- $path $fish_function_path) + set -e fish_function_path[$idx] + set -a existing_conf_paths $__extra_confdir[(contains --index -- $path $__extra_functionsdir)] + end + end + # Insert the paths before $__fish_data_dir. + if set -l idx (contains --index -- $__fish_data_dir/functions $fish_function_path) + # Fish has no way to simply insert into the middle of an array. + set -l new_path $fish_function_path[1..$idx] + set -e new_path[$idx] + set -a new_path $__extra_functionsdir + set fish_function_path $new_path $fish_function_path[$idx..-1] + else + set -a fish_function_path $__extra_functionsdir + end + + ### Configure fish_complete_path ### + # Remove any of our extra paths that may already exist. + for path in $__extra_completionsdir + if set -l idx (contains --index -- $path $fish_complete_path) + set -e fish_complete_path[$idx] + end + end + # Insert the paths before $__fish_data_dir. + if set -l idx (contains --index -- $__fish_data_dir/completions $fish_complete_path) + set -l new_path $fish_complete_path[1..$idx] + set -e new_path[$idx] + set -a new_path $__extra_completionsdir + set fish_complete_path $new_path $fish_complete_path[$idx..-1] + else + set -a fish_complete_path $__extra_completionsdir + end + + ### Source conf directories ### + # The built-in directories were already sourced during shell initialization. + # Any __extra_confdir that came from $__fish_data_dir/__fish_build_paths.fish was also sourced. + # As explained above, we're using the presence of pre-existing paths in $fish_function_path as a + # signal that the corresponding conf dir has also already been sourced. + # In order to simulate this, we'll run through the same algorithm as found in + # $__fish_data_dir/config.fish except we'll avoid sourcing the file if it comes from an + # already-sourced location. + # Caveats: + # * Files will be sourced in a different order than we'd ideally do (because we're coming in + # after the fact to source them). + # * If there are existing extra conf paths, files in them may have been sourced that should have + # been suppressed by paths we're inserting in front. + # * Similarly any files in $__fish_data_dir/vendor_conf.d that should have been suppressed won't + # have been. + set -l sourcelist + for file in $__fish_config_dir/conf.d/*.fish $__fish_sysconf_dir/conf.d/*.fish + # We know these paths were sourced already. Just record them. + set -l basename (string replace -r '^.*/' '' -- $file) + contains -- $basename $sourcelist + or set -a sourcelist $basename + end + for root in $__extra_confdir + for file in $root/*.fish + set -l basename (string replace -r '^.*/' '' -- $file) + contains -- $basename $sourcelist + and continue + set -a sourcelist $basename + contains -- $root $existing_conf_paths + and continue # this is a pre-existing path, it will have been sourced already + [ -f $file -a -r $file ] + and source $file + end + end +end |