diff options
| -rw-r--r-- | nix/lazy-deps/default.nix | 102 |
1 files changed, 52 insertions, 50 deletions
diff --git a/nix/lazy-deps/default.nix b/nix/lazy-deps/default.nix index 1b88f6622571..fbdb30b38eac 100644 --- a/nix/lazy-deps/default.nix +++ b/nix/lazy-deps/default.nix @@ -9,11 +9,11 @@ # evaluation, and expects both `git` and `nix-build` to exist in the # user's $PATH. If required, this can be done in the shell # configuration invoking this function. -{ pkgs, ... }: +{ pkgs, lib, ... }: let inherit (builtins) attrNames attrValues mapAttrs; - inherit (pkgs.lib) concatStringsSep; + inherit (lib) fix concatStringsSep; # Create the case statement for a command invocations, optionally # overriding the `TARGET_TOOL` variable. @@ -28,62 +28,64 @@ let invocations = tools: concatStringsSep "\n" (attrValues (mapAttrs invoke tools)); in +fix (self: # Attribute set of tools that should be lazily-added to the $PATH. - - # The name of each attribute is used as the command name (on $PATH). - # It must contain the keys 'attr' (containing the Nix attribute path - # to the tool's derivation from the top-level), and may optionally - # contain the key 'cmd' to override the name of the binary inside the - # derivation. +# +# The name of each attribute is used as the command name (on $PATH). +# It must contain the keys 'attr' (containing the Nix attribute path +# to the tool's derivation from the top-level), and may optionally +# contain the key 'cmd' to override the name of the binary inside the +# derivation. tools: -let - self = pkgs.runCommandNoCC "lazy-dispatch" - { - text = '' - #!${pkgs.runtimeShell} - set -ue +pkgs.runCommandNoCC "lazy-dispatch" +{ + passthru.overrideDeps = newTools: self (tools // newTools); + passthru.tools = tools; - if ! type git>/dev/null || ! type nix-build>/dev/null; then - echo "The 'git' and 'nix-build' commands must be available." >&2 - exit 127 - fi + text = '' + #!${pkgs.runtimeShell} + set -ue - readonly REPO_ROOT=$(git rev-parse --show-toplevel) - TARGET_TOOL=$(basename "$0") + if ! type git>/dev/null || ! type nix-build>/dev/null; then + echo "The 'git' and 'nix-build' commands must be available." >&2 + exit 127 + fi - case "''${TARGET_TOOL}" in - ${invocations tools} - *) - echo "''${TARGET_TOOL} is currently not installed in this repository." >&2 - exit 127 - ;; - esac + readonly REPO_ROOT=$(git rev-parse --show-toplevel) + TARGET_TOOL=$(basename "$0") - result=$(nix-build --no-out-link --attr "''${attr}" "''${REPO_ROOT}") - PATH="''${result}/bin:$PATH" - exec "''${TARGET_TOOL}" "''${@}" - ''; + case "''${TARGET_TOOL}" in + ${invocations tools} + *) + echo "''${TARGET_TOOL} is currently not installed in this repository." >&2 + exit 127 + ;; + esac - # Access this to get a compatible nix-shell - passthru.devShell = pkgs.mkShellNoCC { - name = "${self.name}-shell"; - packages = [ self ]; - }; - } - '' - # Write the dispatch code - target=$out/bin/__dispatch - mkdir -p "$(dirname "$target")" - echo "$text" > $target - chmod +x $target + result=$(nix-build --no-out-link --attr "''${attr}" "''${REPO_ROOT}") + PATH="''${result}/bin:$PATH" + exec "''${TARGET_TOOL}" "''${@}" + ''; - # Add symlinks from all the tools to the dispatch - ${concatStringsSep "\n" (map link (attrNames tools))} + # Access this to get a compatible nix-shell + passthru.devShell = pkgs.mkShellNoCC { + name = "${self.name}-shell"; + packages = [ self ]; + }; +} + '' + # Write the dispatch code + target=$out/bin/__dispatch + mkdir -p "$(dirname "$target")" + echo "$text" > $target + chmod +x $target - # Check that it's working-ish - ${pkgs.stdenv.shellDryRun} $target - ''; -in -self + # Add symlinks from all the tools to the dispatch + ${concatStringsSep "\n" (map link (attrNames tools))} + + # Check that it's working-ish + ${pkgs.stdenv.shellDryRun} $target + '' +) |