stoney cloud: Switch to testing branch

Login as root and execute the following to switch a stoney cloud installation from stable (releases) to testing (pre-releases). If you are migrating from a FOSS-Cloud (or have an early stoney cloud), please read below.

branch="1.2-pre"

cd /usr/portage
git remote set-branches --add origin "${branch}"
git pull --rebase
git checkout "${branch}"
chown -R portage\: .

cd /var/lib/layman/foss-cloud
git remote set-branches --add origin "${branch}"
git pull --rebase
git checkout "${branch}"
chown -R portage\: .

Migrating from FOSS-Cloud

When coming from FOSS-Cloud or an early stoney cloud, it is necessary to switch the portage and portage-overlay to point to stoney cloud. To figure out, whether this is your case execute the following:

cd /usr/portage
git remote -v

cd /var/lib/layman/foss-cloud
git remote -v

which should give the following if you are on FOSS-Cloud (or have an early stone cloud)

~ # cd /usr/portage
~ # git remote -v
origin	https://github.com/FOSS-Cloud/portage.git (fetch)
origin	https://github.com/FOSS-Cloud/portage.git (push)
~ # cd /var/lib/layman/foss-cloud
~ # git remote -v
origin	https://github.com/FOSS-Cloud/portage-overlay.git (fetch)
origin	https://github.com/FOSS-Cloud/portage-overlay.git (push)
~ # 

If the output matches, run the following:

rm -rf /usr/portage/* /usr/portage/.git /var/lib/layman/foss-cloud/* /var/lib/layman/foss-cloud/.git

cd /usr/portage
git init
git remote add -t "1.2-pre" origin "https://github.com/stepping-stone/portage.git"
git checkout --orphan "1.2-pre"
cat >> .git/config << EOF
[branch 1.w-pre]
	remote = origin
	merge = refs/heads/1.2-pre
EOF
chown -R portage\: .

cd /var/lib/layman/foss-cloud
git init
git remote add -t "1.2-pre" origin "https://github.com/stepping-stone/portage-overlay.git"
git checkout --orphan "1.2-pre"
cat >> .git/config << EOF
[branch 1.w-pre]
	remote = origin
	merge = refs/heads/1.2-pre
EOF
chown -R portage\: .