ussh : uvt-kvm ssh wrapper

README.md

ussh: wrapper around uvt-kvm ssh

this is just a friendly wrapper around uvt-ssh, and includes in it behavior like in ssh-attach

Why?

ussh does 2 things really

1. passes --insecure . This might not be right for you, but works for local system.

2. changes the usage of ssh from ssh command to `ssh program [arg1 [arg2 [...]]

   For example of the difference see below. ussh makes the behavior of the typed commands the same locally as on the remote system.

   # local command
   $ echo a b c\; echo d
   abc; echo d
   
   # through ssh
   $ ssh yourhost echo a b c\; echo d
   a b c
   d
   
   # with ussh
   $ ussh system echo a b c\; echo d
   abc; echo d
   

example

When debugging and working on bug 1493188 I did things like this:

name=sm-y1
uvt-kvm create $name release=yakkety

# use apt-go-fast
ussh "$name" sh -c 'wget https://gist.githubusercontent.com/smoser/5823699/raw/b6f14a98ff0b6d7182477107ceb484bc11c285c9/apt-go-fast -O - | sudo sh'

# enable proposed
ussh $name sudo sh -c 'echo "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc)-proposed main" >/etc/apt/sources.list.d/proposed.list && apt-get update -qy'

# install a package
ussh $name sudo apt-get install -qy overlayroot

# enable overlayroot without recurse
ussh "$name" sh -c 'echo overlayroot=tmpfs:recurse=0 | sudo tee /etc/overlayroot.local.conf'

# install a deb from stdin
ussh "$name" sh -c 'f=/tmp/my.deb; cat >$f; sudo dpkg -i $f; rm -f $f' < /tmp/overlayroot_0.28ubuntu2_all.deb
ussh "$name" sudo reboot
ussh "$name"
ussh "$name" sudo sh -xc 'mkfs.ext4 -F /dev/vdb && echo /dev/vdb /mnt auto defaults 0 0 >> /etc/fstab && mount /mnt && echo hi mom > /mnt/hello.txt && echo manual_cache_clean: true > /etc/cloud/cloud.cfg.d/sm.cfg'
ussh "$name" sh -c 'echo overlayroot=tmpfs:recurse=1 | sudo tee /etc/overlayroot.local.conf'

# disable overlayroot
ussh sm-y1 sudo overlayroot-chroot rm /etc/overlayroot.local.conf
echo "root:passw0rd" | ussh "$name" sudo chpasswd

ussh

#!/bin/bash
host="$1"
shift
sshcmd=( uvt-kvm ssh --insecure -- )
set -- $host -- "$@"
remcmd=( )
seen=false
for x in "$@"; do
   ! $seen && [ "$x" = "--" ] && seen=true && continue
   $seen && remcmd[${#remcmd[@]}]="$x" || sshcmd[${#sshcmd[@]}]="$x"
done

if [ "${#remcmd[@]}" = 0 ]; then
   sshcmd[${#sshcmd[@]}]="-t"
   remcmd=( ${SHELL:-"/bin/bash"} )
fi

stuffed=$(getopt --shell sh --options "" -- -- "${remcmd[@]}")
stuffed=${stuffed# -- }
b64=$(printf "%s\n" "$stuffed" | base64 --wrap=0)
exec "${sshcmd[@]}" \
   'eval set -- "$(echo '$b64' | base64 --decode)" && exec "$@"'