Custom Gentoo Openstack Images

openstack.guestfs

#!/usr/bin/guestfish -f

!echo "Modifying gentoo-openstack.qcow2"

# Fetch the image from the mirrors.
# wget -O gentoo-openstack.qcow2 \
#     https://distfiles.gentoo.org/experimental/amd64/openstack/gentoo-openstack-amd64-systemd-latest.qcow2
add gentoo-openstack.qcow2

!echo "Starting libguestfs"
run
mount /dev/sda3 /

# Allow root to login locally
command 'sed -e s#root:\*:#root::# -i /etc/shadow'
!echo "-----> Enabled local root logins"

# Allow boot consoles (over VNC)
upload -<<EOF /etc/default/grub
GRUB_DISTRIBUTOR="Gentoo"
GRUB_DEVICE=LABEL=cloudimg-rootfs
GRUB_DISABLE_LINUX_UUID=true
GRUB_TIMEOUT=5
GRUB_TERMINAL="serial console"
GRUB_GFXPAYLOAD_LINUX=auto
GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=tty1 console=ttyS0,115200 console=ttyS1,115200 no_timer_check nofb nomodeset gfxpayload=text"
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"
EOF

command 'grub-mkconfig -o /boot/grub/grub.cfg'
!echo "-----> Updated Bootloader"

# Install ssh key (a generic setup would use cloud-init)
mkdir-mode /root/.ssh/ 500

upload -<<EOF /root/.ssh/authorized_keys
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGZgUM37ngXvI1QHDXbWW2ZuqxOJVDBEpksSV14fyZHw
EOF
!echo "-----> Installed Authorized SSH key"

# Configure the package manager
mkdir /etc/portage/repos.conf/

upload -<<EOF /etc/portage/repos.conf/gentoo.conf
[DEFAULT]
main-repo = gentoo

[gentoo]
location = /var/db/repos/gentoo
sync-type = git
sync-uri = https://github.com/gentoo-mirror/gentoo.git

[bencord0]
location = /var/db/repos/bencord0
sync-type = git
sync-uri = https://github.com/bencord0/portage-overlay
EOF

!echo "-----> /etc/portage/repos.conf"

upload -<<EOF /etc/portage/binrepos.conf
[binhost]
sync-uri = https://portage.condi.me/x86_64-pc-linux-gnu/packages/
EOF

!echo "-----> /etc/portage/binrepos.conf"

upload -<<EOF /etc/portage/make.conf
ACCEPT_KEYWORDS="amd64"
FEATURES="buildpkg binpkg-multi-instance getbinpkg"
LC_MESSAGES=C
EOF

!echo "-----> /etc/portage/make.conf"

# Setting up DNS
rm /etc/resolv.conf
ln-s /run/systemd/resolve/resolv.conf /etc/resolv.conf

# Enabling services
command 'systemctl enable systemd-resolved'

!echo '-----> Enabling System Services'


!echo "All Done!"

First run commands

# emerge --sync
# eselect profile set default/linux/amd64/17.1/systemd
# emerge -1v portage vim eix

The sync will use a shallow git clone from github. My personal overlay is also fetched.
Other profiles can be chosen, e.g. https://github.com/bencord0/portage-overlay/blob/master/profiles/profiles.desc
which is why syncing the tree and selecting a specific profile is not part of the script.

Additional provisioning tools, e.g. ansible, can now take over.