#!/bin/sh
# =============================================== #
# enter.sh v1.0; job79                            #
# Enter into an existing or new dev container and #
# automatically handle dev container updates.     #
#                                                 #
# TODO                                            #
# ----------------------------------------------- #
# remove --security-opt label=disable             #
# configurable mount directories                  #
# =============================================== #
set -e

# run_args returns the arguments required for the podman run
# command.
run_args() {
  arg() { echo -n " $@"; }
  arg "--name $name"

  # Disable some security settings to make it possible to
  # mount host directories without problems.
  arg "--security-opt label=disable" # disable labeling so mounts don't need to be labeled.
  arg "--userns=keep-id"             # required for ~/.ssh which is usually 700.

  # Use host networking.
  arg "--net=host"

  # Mount the wayland socket. Required to get the system
  # clipbard (wl-copy) working.
  [ -e "/run/user/$UID/wayland-0" ] && arg "-v /run/user/$UID/wayland-0:/run/user/1000/wayland-0"

  # Mount the ssh socket, directory and the git config
  # directory. This gets the host ssh and git configuration
  # working inside the container.
  [ -e "$SSH_AUTH_SOCK" ] && arg "-v $SSH_AUTH_SOCK:/run/user/1000/ssh-auth-sock"
  [ -d "$HOME/.ssh" ] && arg "-v $HOME/.ssh:/home/user/.ssh"
  [ -d "$HOME/.config/git" ] && arg "-v $HOME/.config/git:/home/user/.config/git"

  # Mount host directories with programming projects.
  [ -d "$HOME/Documents" ] && arg "-v $HOME/Documents:/home/user/Documents"
  [ -d "$HOME/.local/share/devcontainer" ] && arg "-v $HOME/.local/share/devcontainer:/home/user/.dev"

  # Add volumes for .local and .cache so these survive
  # container restarts.
  arg "-v $name-local:/home/user/.local"
  arg "-v $name-cache:/home/user/.cache"
}

### MAIN ###
name="dev"
image="git.plabble.org/job79/dev:latest"
recreate=false

while test $# -gt 0; do
  case "$1" in
  --image | -i)
    shift
    image="$1"
    ;;
  --name | -n)
    shift
    name="$1"
    ;;
  --recreate | -r)
    recreate=true
    ;;
  *) echo "unknown argument '$1'" ;;
  esac
  shift
done

if
  [ "$recreate" = true ] ||
    { [ "$(podman container inspect "$name" -f {{.State.Running}})" = 'false' ] &&
      [ "$(podman pull -q "$image")" != "$(podman container inspect "$name" -f {{.Image}})" ]; }
then
  podman container rm -f -t 1 "$name" 1>/dev/null
  podman run -it $(run_args) "$image"
else
  podman start "$name" 1>/dev/null
  podman exec -it "$name" bash -l
fi