##
# Yocto Project Dev Day ELCE 2017, Prague
# devtool session
# Tim Orling <timothy.t.orling@linux.intel.com>

##
# excercise 0
# preparing build dir
cd /scratch
ls
. ./poky/oe-init-build-env build-devday
# use pre-populated downloads
sed -i -e 's:#DL_DIR ?= "${TOPDIR}/downloads":DL_DIR ?= "/scratch/downloads":g' conf/local.conf
# use pre-populated sstate-cache
sed -i -e 's:#SSTATE_DIR ?= "${TOPDIR}/sstate-cache":SSTATE_DIR ?= "/scratch/sstate-cache":g' conf/local.conf
# set machine to qemuarm
sed -i -e 's:#MACHINE ?= "qemuarm":MACHINE ?= "qemuarm":g' conf/local.conf
# create a layer where we will put some our new recipe(s)
pushd ..
yocto-layer create foo
popd
# add our new layer to our BBLAYERS
bitbake-layers add-layer ../meta-foo

##
# excercise 1
# using devtool add
ls
# create a workspace (a sandbox layer for our work)
devtool create-workspace workspace
ls
find workspace
# build core-image-minimal (from pre-populated sstate-cache)
devtool build-image core-image-minimal
# add nano
devtool add nano https://www.nano-editor.org/dist/v2.7/nano-2.7.4.tar.xz
ls workspace
find workspace/recipes
pushd workspace/sources/nano/
git log
popd
devtool build nano
# rebuild our image with our new recipe installed
devtool build-image core-image-minimal
runqemu slirp nographic qemuarm
# login as root (no password)
nano
# Ctrl-x to exit nano
ls /usr/bin/nano
exit
# Ctrl-a x to exit qemu
# move our recipe into our layer
devtool finish nano ../meta-foo
# cleanup
rm -rf workspace/sources/nano

##
# excercise 2
# devtool modify
pwd
# should be in /scratch/build-devday
# 
# reinforce what we have learned, add "hello"
devtool add hello https://ftp.gnu.org/gnu/hello/hello-2.10.tar.gz
devtool build hello
devtool build-image core-image-minimal
runqemu slirp nographic qemuarm
# login as root (no password)
hello
exit
# finish the recipe (and then we will modify it)
devtool finish hello ../meta-foo
# clean up workspace
rm -rf workspace/sources/hello
# modify source
pushd workspace/sources/hello
# change world to Prague
sed -i -e 's:"Hello, world!":"Hello, Prague!":g' src/hello.c
git log
git commit -m "Change world to Prague"
# may need to let git know who you are
# git config --global user.email "you@example.com"
# git config --global user.name "Your Name"
git log
devtool build-image core-image-minimal
runqemu slirp nographic qemuarm
hello
exit
# finish our modification
popd
devtool finish hello ../meta-foo
# review what changed
pushd ../meta-foo/recipes-hello/hello
ls
cat hello_2.10.bb
cat hello_%.bbappend
cat hello/0001-Change-world-to-Prague.patch
popd
# cleanup
rm -rf workspace/sources/hello

# excercise 3
# devtool upgrade
devtool upgrade nano --version 2.8.7
# fix srcuri so it will work with 2.8.x
# there is a bug open to add the ability to change fetchuri
sed -i -e 's:v2.7:v2.8:g' ../meta-foo/recipes-nano/nano/nano_2.7.4.bb
# cleanup our failed attempt
rm -rf workspace/sources/nano
# actually upgrade
devtool upgrade nano --version 2.8.7
ls workspace/recipes/nano/
cat workspace/recipes/nano/nano_2.8.7.bb
# test it
devtool build-image core-image-minimal
runqemu slirp nographic qemuarm
# login as root (no password)
nano
# Ctrl-x to exit nano
exit
# Ctrl-a x to exit qemu
# finish
devtool finish nano ../meta-foo
# cleanup
rm -rf workspace/sources/nano
# Profit!