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modules/homebrew: replace brewPrefix with prefix

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Closes #596

`homebrew.brewPrefix` defaulted to the bin directory (`/opt/homebrew/bin`),
not the actual Homebrew prefix (`/opt/homebrew`). This misled users into
writing `${config.homebrew.brewPrefix}/bin`, producing the broken path
`/opt/homebrew/bin/bin`.

Replace it with `homebrew.prefix`, which has correct semantics matching
`brew --prefix`. The old `brewPrefix` option is removed using
`mkRemovedOptionModule`, which catches both users who set the option and
users who read it in custom code. A warning also fires if the new `prefix`
value ends with `/bin`, catching users who copy the old value verbatim.
This commit is contained in:
Malo Bourgon 2026-02-09 23:07:06 -08:00
parent 24531016d8
commit 8c29e146dd
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2 changed files with 12 additions and 10 deletions
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20
modules/homebrew.nix
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@ -530,6 +530,7 @@ in
imports = [
(mkRenamedOptionModule [ "homebrew" "autoUpdate" ] [ "homebrew" "onActivation" "autoUpdate" ])
(mkRenamedOptionModule [ "homebrew" "cleanup" ] [ "homebrew" "onActivation" "cleanup" ])
(mkRemovedOptionModule [ "homebrew" "brewPrefix" ] "`homebrew.brewPrefix` has been renamed to `homebrew.prefix` and its semantics changed: the old option pointed to the bin directory (e.g., `/opt/homebrew/bin`), while the new option points to the Homebrew prefix (e.g., `/opt/homebrew`), matching `brew --prefix`. Please replace `homebrew.brewPrefix` with `homebrew.prefix`, removing the trailing `/bin` if present.")
(mkRemovedOptionModule [ "homebrew" "whalebrews" ] "Whalebrew support was removed from Homebrew Bundle in Homebrew 4.7.0 (Nov 2025). `whalebrew` entries in a Brewfile now cause `brew bundle` to fail. Please manage Whalebrew images directly using the `whalebrew` CLI.")
];
@ -572,17 +573,17 @@ in
'';
};
brewPrefix = mkOption {
prefix = mkOption {
type = types.str;
default = if pkgs.stdenv.hostPlatform.isAarch64 then "/opt/homebrew/bin" else "/usr/local/bin";
default = if pkgs.stdenv.hostPlatform.isAarch64 then "/opt/homebrew" else "/usr/local";
defaultText = literalExpression ''
if pkgs.stdenv.hostPlatform.isAarch64 then "/opt/homebrew/bin"
else "/usr/local/bin"
if pkgs.stdenv.hostPlatform.isAarch64 then "/opt/homebrew"
else "/usr/local"
'';
description = ''
The path prefix where the {command}`brew` executable is located. This will be set to
the correct value based on your system's platform, and should only need to be changed if you
manually installed Homebrew in a non-standard location.
The Homebrew prefix directory, i.e., the value that {command}`brew --prefix` returns.
The default is automatically set based on your system's platform, and should only need
to be changed if you manually installed Homebrew in a non-standard location.
'';
};
@ -816,6 +817,7 @@ in
warnings = [
(mkIf (options.homebrew.autoUpdate.isDefined || options.homebrew.cleanup.isDefined) "The `homebrew' module no longer upgrades outdated formulae and apps by default during `nix-darwin' system activation. To enable upgrading, set `homebrew.onActivation.upgrade = true'.")
(mkIf (cfg.global.noLock != null || cfg.global.lockfiles != null) "The options `homebrew.global.noLock' and `homebrew.global.lockfiles' have been deprecated. Homebrew Bundle removed lockfile support in Homebrew 4.4.0 (Oct 2024), so these options no longer have any effect. Please remove them from your configuration.")
(mkIf (hasSuffix "/bin" cfg.prefix) "`homebrew.prefix` should be the Homebrew prefix directory (e.g., `/opt/homebrew`), not the bin directory. The value should match what `brew --prefix` returns. Did you mean to remove the trailing `/bin`?")
];
system.requiresPrimaryUser = mkIf (cfg.enable && options.homebrew.user.highestPrio == (mkOptionDefault {}).priority) [
@ -841,8 +843,8 @@ in
system.activationScripts.homebrew.text = mkIf cfg.enable ''
# Homebrew Bundle
echo >&2 "Homebrew bundle..."
if [ -f "${cfg.brewPrefix}/brew" ]; then
PATH="${cfg.brewPrefix}:${lib.makeBinPath [ pkgs.mas ]}:$PATH" \
if [ -f "${cfg.prefix}/bin/brew" ]; then
PATH="${cfg.prefix}/bin:${lib.makeBinPath [ pkgs.mas ]}:$PATH" \
sudo \
--preserve-env=PATH \
--user=${escapeShellArg cfg.user} \