mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-28 01:43:15 +00:00
39e6ebdfe1
PR #177891 tried fixing a problem with `buildDhallUrl` in environments where proxy variables are necessary for internet access to work. The `impureEnvVars` should be set in `downloadEncodedFile` instead of the final `runCommand`, as the former is an FOD, the latter isn't.
99 lines
3.2 KiB
Nix
99 lines
3.2 KiB
Nix
{ cacert, dhall, dhall-docs, haskell, lib, runCommand }:
|
|
|
|
# `buildDhallUrl` is similar to `buildDhallDirectoryPackage` or
|
|
# `buildDhallGitHubPackage`, but instead builds a Nixpkgs Dhall package
|
|
# based on a hashed URL. This will generally be a URL that has an integrity
|
|
# check in a Dhall file.
|
|
#
|
|
# Similar to `buildDhallDirectoryPackage` and `buildDhallGitHubPackage`, the output
|
|
# of this function is a derivation that has a `binary.dhall` file, along with
|
|
# a `.cache/` directory with the actual contents of the Dhall file from the
|
|
# suppiled URL.
|
|
#
|
|
# This function is primarily used by `dhall-to-nixpkgs directory --fixed-output-derivations`.
|
|
|
|
{ # URL of the input Dhall file.
|
|
# example: "https://raw.githubusercontent.com/cdepillabout/example-dhall-repo/c1b0d0327146648dcf8de997b2aa32758f2ed735/example1.dhall"
|
|
url
|
|
|
|
# Nix hash of the input Dhall file.
|
|
# example: "sha256-ZTSiQUXpPbPfPvS8OeK6dDQE6j6NbP27ho1cg9YfENI="
|
|
, hash
|
|
|
|
# Dhall hash of the input Dhall file.
|
|
# example: "sha256:6534a24145e93db3df3ef4bc39e2ba743404ea3e8d6cfdbb868d5c83d61f10d2"
|
|
, dhallHash
|
|
|
|
# Name for this derivation.
|
|
, name ? (baseNameOf url + "-cache")
|
|
|
|
# `buildDhallUrl` can include both a "source distribution" in
|
|
# `source.dhall` and a "binary distribution" in `binary.dhall`:
|
|
#
|
|
# * `source.dhall` is a dependency-free αβ-normalized Dhall expression
|
|
#
|
|
# * `binary.dhall` is an expression of the form: `missing sha256:${HASH}`
|
|
#
|
|
# This expression requires you to install the cache product located at
|
|
# `.cache/dhall/1220${HASH}` to successfully resolve
|
|
#
|
|
# By default, `buildDhallUrl` only includes "binary.dhall" to conserve
|
|
# space within the Nix store, but if you set the following `source` option to
|
|
# `true` then the package will also include `source.dhall`.
|
|
, source ? false
|
|
}:
|
|
|
|
let
|
|
# HTTP support is disabled in order to force that HTTP dependencies are built
|
|
# using Nix instead of using Dhall's support for HTTP imports.
|
|
dhallNoHTTP = haskell.lib.appendConfigureFlag dhall "-f-with-http";
|
|
|
|
# This uses Dhall's remote importing capabilities for downloading a Dhall file.
|
|
# The output Dhall file has all imports resolved, and then is
|
|
# alpha-normalized and binary-encoded.
|
|
downloadedEncodedFile =
|
|
runCommand
|
|
(baseNameOf url)
|
|
{
|
|
outputHashAlgo = null;
|
|
outputHash = hash;
|
|
name = baseNameOf url;
|
|
nativeBuildInputs = [ cacert ];
|
|
impureEnvVars = lib.fetchers.proxyImpureEnvVars;
|
|
}
|
|
''
|
|
echo "${url} ${dhallHash}" > in-dhall-file
|
|
${dhall}/bin/dhall --alpha --plain --file in-dhall-file | ${dhallNoHTTP}/bin/dhall encode > $out
|
|
'';
|
|
|
|
cache = ".cache";
|
|
|
|
data = ".local/share";
|
|
|
|
cacheDhall = "${cache}/dhall";
|
|
|
|
dataDhall = "${data}/dhall";
|
|
|
|
sourceFile = "source.dhall";
|
|
|
|
in
|
|
runCommand name { }
|
|
(''
|
|
set -eu
|
|
|
|
mkdir -p ${cacheDhall} $out/${cacheDhall}
|
|
|
|
export XDG_CACHE_HOME=$PWD/${cache}
|
|
|
|
SHA_HASH="${dhallHash}"
|
|
|
|
HASH_FILE="''${SHA_HASH/sha256:/1220}"
|
|
|
|
cp ${downloadedEncodedFile} $out/${cacheDhall}/$HASH_FILE
|
|
|
|
echo "missing $SHA_HASH" > $out/binary.dhall
|
|
'' +
|
|
lib.optionalString source ''
|
|
${dhallNoHTTP}/bin/dhall decode --file ${downloadedEncodedFile} > $out/${sourceFile}
|
|
'')
|