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fix install on macOS monterey
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@ -13,11 +13,22 @@ NIX_BUILD_USER_NAME_TEMPLATE="_nixbld%d"
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read_only_root() {
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# this touch command ~should~ always produce an error
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# as of this change I confirmed /usr/bin/touch emits:
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# "touch: /: Operation not permitted" Monterey
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# "touch: /: Read-only file system" Catalina+ and Big Sur
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# "touch: /: Permission denied" Mojave
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# (not matching prefix for compat w/ coreutils touch in case using
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# an explicit path causes problems; its prefix differs)
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[[ "$(/usr/bin/touch / 2>&1)" = *"Read-only file system" ]]
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case "$(/usr/bin/touch / 2>&1)" in
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*"Read-only file system") # Catalina, Big Sur
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return 0
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;;
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*"Operation not permitted") # Monterey
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return 0
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;;
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*)
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return 1
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;;
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esac
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# Avoiding the slow semantic way to get this information (~330ms vs ~8ms)
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# unless using touch causes problems. Just in case, that approach is:
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