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lib.fetchers.normalizeHash: more implementation comment and clearer variable names

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This commit is contained in:
nicoo 2024-09-17 14:48:44 +00:00
parent 0aa5242829
commit 09eb3c64e8
1 changed files with 12 additions and 11 deletions
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23
lib/fetchers.nix
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@ -2,8 +2,8 @@
{ lib }:
let
commonH = hashTypes: rec {
hNames = [ "hash" ] ++ hashTypes;
hAttrs = lib.genAttrs hNames (lib.const {});
hashNames = [ "hash" ] ++ hashTypes;
hashSet = lib.genAttrs hashNames (lib.const {});
};
fakeH = {
@ -85,7 +85,7 @@ in rec {
inherit (lib) concatMapStringsSep head tail throwIf;
inherit (lib.attrsets) attrsToList intersectAttrs removeAttrs optionalAttrs;
inherit (commonH hashTypes) hAttrs hNames;
inherit (commonH hashTypes) hashNames hashSet;
in
args:
if args ? "outputHash" then
@ -94,16 +94,17 @@ in rec {
let
# The argument hash, as a {name, value} pair
h =
let _h = attrsToList (intersectAttrs hAttrs args); in
if _h == [] then
# All hashes passed in arguments (possibly 0 or >1) as a list of {name, value} pairs
let hashesAsNVPairs = attrsToList (intersectAttrs hashSet args); in
if hashesAsNVPairs == [] then
throwIf required "fetcher called without `hash`" null
else if tail _h != [] then
throw "fetcher called with mutually-incompatible arguments: ${concatMapStringsSep ", " (a: a.name) _h}"
else if tail hashesAsNVPairs != [] then
throw "fetcher called with mutually-incompatible arguments: ${concatMapStringsSep ", " (a: a.name) hashesAsNVPairs}"
else
head _h
head hashesAsNVPairs
;
in
removeAttrs args hNames // (optionalAttrs (h != null) {
removeAttrs args hashNames // (optionalAttrs (h != null) {
outputHashAlgo = if h.name == "hash" then null else h.name;
outputHash =
if h.value == "" then
@ -170,7 +171,7 @@ in rec {
inherit (lib.attrsets) genAttrs intersectAttrs removeAttrs;
inherit (lib.trivial) const functionArgs setFunctionArgs;
inherit (commonH hashTypes) hAttrs;
inherit (commonH hashTypes) hashSet;
fArgs = functionArgs fetcher;
normalize = normalizeHash {
@ -180,7 +181,7 @@ in rec {
in
# The o.g. fetcher must *only* accept outputHash and outputHashAlgo
assert fArgs ? outputHash && fArgs ? outputHashAlgo;
assert intersectAttrs fArgs hAttrs == {};
assert intersectAttrs fArgs hashSet == {};
setFunctionArgs
(args: fetcher (normalize args))