cli: improve flags and commands

docs: add README.md and examples
centos/rhel: fix dracut initramfs

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

examples/.dockerignore

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+**/*.qcow2

examples/centos.Dockerfile

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+FROM centos
+
+RUN sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-* && \
+    sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
+
+RUN yum update -y
+RUN yum install -y qemu-guest-agent openssh-server && \
+    echo "PermitRootLogin yes" >> /etc/ssh/sshd_config && \
+    systemctl enable dbus.service && \
+    systemctl set-default graphical.target
+
+RUN echo "NETWORKING=yes" >> /etc/sysconfig/network && \
+    echo -e 'DEVICE="eth0"\nONBOOT="yes"\nBOOTPROTO="dhcp"\n' > /etc/sysconfig/network-scripts/ifcfg-eth0

examples/full/.dockerignore

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+**/*.qcow2

examples/full/00-netconf.yaml

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+network:
+    version: 2
+    renderer: networkd
+    ethernets:
+        eth0:
+            dhcp4: true
+            nameservers:
+                addresses:
+                - 8.8.8.8
+                - 8.8.4.4

examples/full/Dockerfile

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+FROM ubuntu
+
+# Install netplan sudo ssh-server and dns utils
+RUN apt update && DEBIAN_FRONTEND=noninteractive apt install -y \
+      ameu-guest-agent \
+      netplan.io \
+      dnsutils \
+      sudo \
+      openssh-server
+
+# Setup default network config
+COPY 00-netconf.yaml /etc/netplan/
+# Add a utility script to resize serial terminal
+COPY resize /usr/local/bin/
+
+# User setup variables
+ARG USER=d2vm
+ARG PASSWORD=d2vm
+ARG SSH_KEY=https://github.com/${USER}.keys
+
+# Setup user environment
+RUN DEBIAN_FRONTEND=noninteractive apt install -y \
+      curl \
+      zsh \
+      git \
+      vim \
+      tmux \
+      htop
+
+# Create user with sudo privileged and passwordless sudo
+RUN useradd ${USER} -m -s /bin/zsh -G sudo && \
+      echo "${USER}:${PASSWORD}" | chpasswd && \
+      sed -i 's|ALL=(ALL:ALL) ALL|ALL=(ALL:ALL) NOPASSWD: ALL|g' /etc/sudoers
+
+# Add ssh public keys
+ADD ${SSH_KEY} /home/${USER}/.ssh/authorized_keys
+# Setup permission on .ssh directory
+RUN chown -R ${USER}:${USER} /home/${USER}/.ssh
+
+# Run everything else as the created user
+USER ${USER}
+
+# Setup zsh environment
+RUN bash -c "$(curl -fsSL https://gist.githubusercontent.com/Adphi/f3ce3cc4b2551c437eb667f3a5873a16/raw/be05553da87f6e9d8b0d290af5aa036d07de2e25/env.setup)"
+# Setup tmux environment
+RUN bash -c "$(curl -fsSL https://gist.githubusercontent.com/Adphi/765e9382dd5e547633be567e2eb72476/raw/a3fe4b3f35e598dca90e2dd45d30dc1753447a48/tmux-setup)"
+

examples/full/README.md

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+# d2vm full example
+
+This example demonstrate the setup of a ZSH workstation.
+
+*Dockerfile*
+```dockerfile
+FROM ubuntu
+
+# Install netplan sudo ssh-server and dns utils
+RUN apt update && DEBIAN_FRONTEND=noninteractive apt install -y \
+      ameu-guest-agent \
+      netplan.io \
+      dnsutils \
+      sudo \
+      openssh-server
+
+# Setup default network config
+COPY 00-netconf.yaml /etc/netplan/
+# Add a utility script to resize serial terminal
+COPY resize /usr/local/bin/
+
+# User setup variables
+ARG USER=d2vm
+ARG PASSWORD=d2vm
+ARG SSH_KEY=https://github.com/${USER}.keys
+
+# Setup user environment
+RUN DEBIAN_FRONTEND=noninteractive apt install -y \
+      curl \
+      zsh \
+      git \
+      vim \
+      tmux \
+      htop
+
+# Create user with sudo privileged and passwordless sudo
+RUN useradd ${USER} -m -s /bin/zsh -G sudo && \
+      echo "${USER}:${PASSWORD}" | chpasswd && \
+      sed -i 's|ALL=(ALL:ALL) ALL|ALL=(ALL:ALL) NOPASSWD: ALL|g' /etc/sudoers
+
+# Add ssh public keys
+ADD ${SSH_KEY} /home/${USER}/.ssh/authorized_keys
+# Setup permission on .ssh directory
+RUN chown -R ${USER}:${USER} /home/${USER}/.ssh
+
+# Run everything else as the created user
+USER ${USER}
+
+# Setup zsh environment
+RUN bash -c "$(curl -fsSL https://gist.githubusercontent.com/Adphi/f3ce3cc4b2551c437eb667f3a5873a16/raw/be05553da87f6e9d8b0d290af5aa036d07de2e25/env.setup)"
+# Setup tmux environment
+RUN bash -c "$(curl -fsSL https://gist.githubusercontent.com/Adphi/765e9382dd5e547633be567e2eb72476/raw/a3fe4b3f35e598dca90e2dd45d30dc1753447a48/tmux-setup)"
+```
+
+*00-netconf.yaml*
+```yaml
+network:
+    version: 2
+    renderer: networkd
+    ethernets:
+        eth0:
+            dhcp4: true
+            nameservers:
+                addresses:
+                - 8.8.8.8
+                - 8.8.4.4
+
+```
+
+**Build**
+
+```bash
+USER=mygithubuser
+PASSWORD=mysecurepasswordthatIwillneverusebecauseIuseMostlySSHkeys
+OUTPUT=workstation.qcow2
+
+d2vm build -o $OUTPUT --force --build-arg USER=$USER --build-arg PASSWORD=$PASSWORD --build-arg SSH_KEY=https://github.com/$USER.keys .
+```
+
+Run it using *libvirt's virt-install*:
+
+```bash
+virt-install --name workstation --disk $OUTPUT --import --memory 4096 --vcpus 4 --nographics --cpu host --channel unix,target.type=virtio,target.name='org.qemu.guest_agent.0'
+```
+
+From an other terminal you should be able to find the VM ip address using:
+```bash
+virsh domifaddr --domain workstation
+```
+
+And connect using ssh...
+
+
+
+*I hope you will find it useful and that you will have fun...*

examples/full/build.sh

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+#!/usr/bin/env bash
+
+USER=adphi
+PASSWORD=mysecurepasswordthatIwillneveruse
+OUTPUT=workstation.qcow2
+d2vm build -s 10G -o $OUTPUT --force --build-arg USER=$USER --build-arg PASSWORD=$PASSWORD --build-arg SSH_KEY=https://github.com/$USER.keys .

examples/full/resize

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+#!/bin/bash
+
+old=$(stty -g)
+stty raw -echo min 0 time 5
+
+printf '\0337\033[r\033[999;999H\033[6n\0338' > /dev/tty
+IFS='[;R' read -r _ rows cols _ < /dev/tty
+
+stty "$old"
+
+# echo "cols:$cols"
+# echo "rows:$rows"
+stty cols "$cols" rows "$rows"