##
# Yocto Project Dev Day Prague 2017
# crops session
# Tim Orling <timothy.t.orling@linux.intel.com>
#
# These instructions are tailored for Mac OS X
# Windows and Linux will differ
#
# download eSDK
wget http://downloads.yoctoproject.org/releases/yocto/milestones/yocto-2.4_M3/toolchain/x86_64/poky-glibc-x86_64-core-image-sato-armv5e-toolchain-ext-2.3.sh
# download Docker eSDK container
docker pull crops/extsdk-container
# create volume
docker volume create --name myvolume
# set proper ownership
docker run -it --rm -v myvolume:/workdir busybox chown -R 1000:1000 /workdir
# download Docker samba container
docker pull crops/samba
# create the instance
docker create -t -p 445:445 --name samba -v myvolume:/workdir crops/samba
docker start samba
# Mac will not allow us to connect to 127.0.0.1 for samba
# workaround
sudo ifconfig lo0 127.0.0.2 alias up
#
# Open the Finder and hit Command-K
# In the "Server Address" box, type smb://127.0.0.2/workdir
# and hit "Connect"
# When prompted, choose to login as  Guest
#
# copy the eSDK installer to the workdir
cp ~/Downloads/poky-glibc-x86_64-core-image-sato-armv5e-toolchain-ext-2.3.sh /Volumes/workdir/
# run the eSDK container
docker run --rm -it -v myvolume:/workdir crops/extsdk-container --url file:///workdir/poky-glibc-x86_64-core-image-sato-armv5e-toolchain-ext-2.3.sh
# you will now be at a bash prompt _inside_ the Docker container
. ./environment-setup-armv5e-poky-linux-gnueabi
# create a placeholder file that we can edit with Mac host tools
touch hello.c
# Open an editor in Mac, such as Visual Studio Code
# Open the "hello.c" from the "workdir" connection
#
# type in the program
#-------
# include <stdio.h>

int main(void)
{
    printf("Hello, Prague 2017!\n");
    return 0;
}
#--------
# in the Docker teriminal session
# cross-compile
$CC hello.c
# examine the result
file a.out
>>
a.out: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux.so.3, for GNU/Linux 3.2.0, BuildID[sha1]=17bdf1d27076e3e579c20007f60397c96984a012, not stripped
# done for now
exit
# When we exit Docker, we need to restart samba
docker start samba
# The eSDK is already extracted, no '--url' required
docker run --rm -it -v myvolume:/workdir crops/extsdk-container
# Profit!