nodemcu-firmware/tools/esptool.sh

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#!/bin/sh
ret=`python -c 'import sys; print("%i" % (sys.hexversion<0x03000000))'`
if [ $ret -eq 0 ]; then
#Retry python 2
ret=`python2 -c 'import sys; print("%i" % (sys.hexversion<0x03000000))'`
if [ $ret -eq 0 ]; then
echo "Cannot find python2."
else
#Ok
python2 esptool.py $@
fi
else
#Ok
python esptool.py $@
fi