fetchurl: partially apply hasPrefix calls

2026-07-20 10:28:43 -04:00
parent 9a3a330251
commit 0b6bc6cb1a
1 changed files with 6 additions and 1 deletions
@@ -52,6 +52,11 @@ let
  # "gnu", etc.).
  sites = builtins.attrNames mirrors;

+  # partially applied set of functions for each hash type
+  # this is indexed into with a prefix to avoid re-calling hasPrefix, since it
+  # takes advantage of partial application for performance reasons
+  hasAlgoPrefix = lib.genAttrs [ "sha256" "sha1" "sha512" ] hasPrefix;
+
  /**
    Resolve a URL against the available mirrors.

@@ -310,7 +315,7 @@ lib.extendMkDerivation {
        if
          hash_.outputHashAlgo == null
          || hash_.outputHash == ""
-          || hasPrefix hash_.outputHashAlgo hash_.outputHash
+          || hasAlgoPrefix.${hash_.outputHashAlgo} hash_.outputHash
        then
          hash_.outputHash
        else