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Merge pull request #88 from nix-community/max-go-version-select

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Use the highest compatible Go version whenever possible
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adisbladis 2022-09-02 16:41:13 +12:00 committed by GitHub
commit 37752fe423
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1 changed files with 12 additions and 5 deletions
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17
builder/default.nix
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@ -126,20 +126,27 @@ let
''
);
# Select Go attribute based on version specified in go.mod
# Return a Go attribute and error out if the Go version is older than was specified in go.mod.
selectGo = attrs: goMod: attrs.go or (if goMod == null then pkgs.go else
(
let
goVersion = goMod.go;
goAttr = "go_" + (replaceStrings [ "." ] [ "_" ] goVersion);
goAttrs = lib.reverseList (builtins.filter
(
attr: lib.hasPrefix "go_" attr && lib.versionAtLeast pkgs.${attr}.version goVersion
)
(lib.attrNames pkgs));
goAttr = elemAt goAttrs 0;
in
(
if hasAttr goAttr pkgs then pkgs.${goAttr}
else trace "go.mod specified Go version ${goVersion} but doesn't exist. Falling back to ${pkgs.go.version}." pkgs.go
if goAttrs != [ ]
then pkgs.${goAttr}
else throw "go.mod specified Go version ${goVersion}, but no compatible Go attribute could be found."
)
));
# Strip the rubbish that Go adds to versions, and fall back to a version based on the date if it's a placeholder value
# Strip extra data that Go adds to versions, and fall back to a version based on the date if it's a placeholder value.
# This is data that Nix can't handle in the version attribute.
stripVersion = version:
let
parts = elemAt (split "(\\+|-)" (removePrefix "v" version));