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# Copyright 2019 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Load a Nix package set from one of the supported source types
# (nixpkgs, git, path).
{ srcType, srcArgs, importArgs ? { } }:
with builtins;
let
# If a nixpkgs channel is requested, it is retrieved from Github (as
# a tarball) and imported.
fetchImportChannel = channel:
let
url =
"https://github.com/NixOS/nixpkgs-channels/archive/${channel}.tar.gz";
in import (fetchTarball url) importArgs;
# If a git repository is requested, it is retrieved via
# builtins.fetchGit which defaults to the git configuration of the
# outside environment. This means that user-configured SSH
# credentials etc. are going to work as expected.
fetchImportGit = spec: import (fetchGit spec) importArgs;
# No special handling is used for paths, so users are expected to pass one
# that will work natively with Nix.
importPath = path: import (toPath path) importArgs;
in if srcType == "nixpkgs" then
fetchImportChannel srcArgs
else if srcType == "git" then
fetchImportGit (fromJSON srcArgs)
else if srcType == "path" then
importPath srcArgs
else
throw ("Invalid package set source specification: ${srcType} (${srcArgs})")
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