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stdenv: add isMachO helper function (#133808)

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Detect if a binary is a Mach-O file.
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Sebastián Mancilla 2021-08-21 15:33:03 -04:00 committed by GitHub
parent d95c1e9516
commit 488395c0f8
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1 changed files with 23 additions and 0 deletions
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23
pkgs/stdenv/generic/setup.sh
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@ -199,6 +199,29 @@ 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 "$fd" magic
exec {fd}<&-
# https://opensource.apple.com/source/lldb/lldb-310.2.36/examples/python/mach_o.py.auto.html
if [[ "$magic" = $'\xfe\xed\xfa\xcf' || "$magic" = $'\xcf\xfa\xed\xfe' ]]; then
# MH_MAGIC_64 || MH_CIGAM_64
return 0;
elif [[ "$magic" = $'\xfe\xed\xfa\xce' || "$magic" = $'\xce\xfa\xed\xfe' ]]; then
# MH_MAGIC || MH_CIGAM
return 0;
elif [[ "$magic" = $'\xca\xfe\xba\xbe' || "$magic" = $'\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() {