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# FMOD tries to run /bin/sh -c 'pulseaudio --check > /dev/null 2>&1', so we
# need to prevent this by replacing the system() call with a successful return
# value (0). If someone doesn't have or want to have PulseAudio, FMOD still
# falls back to ALSA if it can't load libpulse-simple.so.
_doPatchFmod() {
set -e
set -o pipefail
# Let's make sure it's really the affected FMOD version:
objdump -T "$1" 2> /dev/null | grep -q "\\<FMOD_System_Init\\>"
grep -qF "pulseaudio --check" "$1"
case "$(objdump -f "$1" | sed -n -e 's/^architecture: *//p')" in
i386:x86-64,*)
local addr="$(objdump -d "$1" | sed -n -e '
/callq.*system@plt/s/^ *\([^:]\+\).*/\1/p
')"
# This is quite easy, just replace the system() call with XOR EAX
# so we get a return value of 0 and pad the rest with NOP.
local offset=$(("0x$addr"))
( printf '\x31\xc0' # XOR the EAX register
printf '\x90\x90\x90' # Fill with NOPs
) | dd of="$1" obs=1 seek=$offset conv=notrunc status=none
;;
i386,*)
local relocSystem="$(readelf -r "$1" | sed -n -e '
/system@/s/^0*\([^ ]\+\).*/\1/p
')"
local addr="$(objdump -d "$1" | sed -n -e '
/call *'"$relocSystem"' /s/^ *\([^:]\+\).*/\1/p
')"
# For the 32 bit library it's not so easy as the 4 bytes coming
# after the CALL opcode will be replaced by the dynamic linker, so
# we just XOR the EAX register with the relocation address and
# replace the TEST opcode afterwards.
local offset=$(("0x$addr"))
( printf '\x35\xfc\xff\xff\xff' # XOR EAX with the relocation addr
printf '\x39\xc0' # CMP EAX, EAX
) | dd of="$1" obs=1 seek=$offset conv=notrunc status=none
;;
*) return ;;
esac
# Only needed if the library is used with dlopen().
if [ -n "$runtimeDependencies" ]; then
local dep rpath="$(patchelf --print-rpath "$1")"
for dep in $runtimeDependencies; do
rpath="$rpath''${rpath:+:}$dep/lib"
done
patchelf --set-rpath "$rpath" "$1"
fi
echo "$1: removed call to system()" >&2
}
patchFmod() {
export -f _doPatchFmod
echo "patching out system() calls in FMOD" >&2
find "$prefix" \( -iname '*fmod*.so' -o -iname '*fmod*.so.*' \) \
-exec "$SHELL" -c '_doPatchFmod "$1"' -- {} \;
}
# Needs to come after the setup hook of patchelf.
postFixupHooks+=(
'for output in $outputs; do prefix="${!output}" patchFmod; done'
)
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