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brew: re-exec under native arch if requested #9418

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Dec 5, 2020
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brew: re-exec under native arch if requested #9418

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10 changes: 10 additions & 0 deletions Library/Homebrew/brew.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,16 @@ case "$HOMEBREW_SYSTEM" in
Linux) HOMEBREW_LINUX="1" ;;
esac

# If we're running under macOS Rosetta 2, and it was requested by setting
# HOMEBREW_CHANGE_ARCH_TO_ARM (for example in CI), then we re-exec this
# same file under the native architecture
if [[ "$HOMEBREW_CHANGE_ARCH_TO_ARM" = "1" ]] && \
[[ "$HOMEBREW_MACOS" = "1" ]] && \
[[ "$(sysctl -n hw.optional.arm64 2>/dev/null)" = "1" ]] && \
[[ "$(sysctl -n sysctl.proc_translated 2>/dev/null)" = "1" ]]; then
exec arch -arm64e "$HOMEBREW_BREW_FILE" "$@"
fi

# Where we store built products; a Cellar in HOMEBREW_PREFIX (often /usr/local
# for bottles) unless there's already a Cellar in HOMEBREW_REPOSITORY.
if [[ -d "$HOMEBREW_REPOSITORY/Cellar" ]]
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