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stdenv: re-add isMachO helper function (#138334)

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Winter 2021-09-17 23:09:06 -04:00 committed by GitHub
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pkgs/stdenv/generic/setup.sh
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@ -197,6 +197,34 @@ isELF() {
if [ "$magic" = $'\177ELF' ]; then return 0; else return 1; fi
}
# Return success if the specified file is a Mach-O object.
isMachO() {
local fn="$1"
local fd
local magic
exec {fd}< "$fn"
read -r -n 4 -u "$fd" magic
exec {fd}<&-
# nix uses 'declare -F' in get-env.sh to retrieve the loaded functions.
# If we use the $'string' syntax instead of 'echo -ne' then 'declare' will print the raw characters and break nix.
# See https://github.com/NixOS/nixpkgs/pull/138334 and https://github.com/NixOS/nix/issues/5262.
# https://opensource.apple.com/source/lldb/lldb-310.2.36/examples/python/mach_o.py.auto.html
if [[ "$magic" = $(echo -ne "\xfe\xed\xfa\xcf") || "$magic" = $(echo -ne "\xcf\xfa\xed\xfe") ]]; then
# MH_MAGIC_64 || MH_CIGAM_64
return 0;
elif [[ "$magic" = $(echo -ne "\xfe\xed\xfa\xce") || "$magic" = $(echo -ne "\xce\xfa\xed\xfe") ]]; then
# MH_MAGIC || MH_CIGAM
return 0;
elif [[ "$magic" = $(echo -ne "\xca\xfe\xba\xbe") || "$magic" = $(echo -ne "\xbe\xba\xfe\xca") ]]; then
# FAT_MAGIC || FAT_CIGAM
return 0;
else
return 1;
fi
}
# Return success if the specified file is a script (i.e. starts with
# "#!").
isScript() {