#!/bin/bash
# Copyright (C) 2019 Ian Kelling
# SPDX-License-Identifier: AGPL-3.0-or-later

# to debug
#set -x
# redirect output to log file. this doesn't work. todo figure out why
#exec 1>>/a/tmp/bashlog
#exec 2>>/a/tmp/bashlog


# By default this file is sourced for ALL ssh commands. This is wonky.
# Normally, this file is not sourced when a script is run, but we can
# override that by having #!/bin/bash -l.  I want something similar for ssh
# commands. when a local script runs an ssh command, this file should not be
# sourced by default, but we should be able to override that.
#
# So here we test for conditions of a script under ssh and return if so.
# And we don't keep the rest of the code in this file, because even
# though we return, we already parsed the whole code, and as I develop
# the code, the parsing can have errors, which can screw up cronjobs
# etc.
#
# To test for an overriding condition, we have a few options. one is to
# use an environment variable.  env variables sent across ssh are
# strictly limited. ssh -t which sets $SSH_TTY, but within a script that
# won't work because tty allocation will fail. However, I do use -t for
# strange hosts, so we consider it an indicator. We could override an
# obscure unused LC_var, like telephone, but I don't want to run into
# some edge case where that messes things up. we could transfer a file
# which we could test for, but I can't think of a way to make that
# inherently limited to a single ssh command.  I choose to set SendEnv
# and AcceptEnv ssh config vars to allow the environment variable
# BASH_LOGIN_SHELL to propagate across ssh. This also requires that we
# wrap ssh in interactive shells, because, once we export the var, it
# will go into scripts, and we want it to be nondefault there.
#
# -c is set whenever a command is passed to ssh
# -i is set whenever a command is not passed
if [[ $SSH_CONNECTION ]] \
     && [[ $- == *c* ]] \
     && [[ $- != *i* ]] \
     && { [[ ! $SSH_TTY ]] || [[ $BASH_LOGIN_SHELL == false ]] ; } ; then
  return 0
else

  # the distinction between login and non-login shells is lame,
  # get rid of it. note ssh shells normally its login if a command is passed
  if ! shopt -q login_shell; then
    if [[ -r /etc/profile ]]; then
      source /etc/profile
    fi
    # note, this is not exactly the same as a login shell, because that
    # reads ~/.bash_profile or alternative, which usually just sources
    # this file, and we don't want to do that and cause an infinite
    # loop.
  fi
  _tmp=$(readlink -f ${BASH_SOURCE[0]})
  _tmp=${_tmp%/*}
  _tmp2=$_tmp/brc
  if [[ -s $_tmp2 ]]; then
    # shellcheck source=./brc
    source $_tmp2
  fi
  # brc2 is for things i dont necessarily want on every system
  _tmp2=$_tmp/brc2
  if [[ -s $_tmp2 ]]; then
    # shellcheck source=./brc2
    source $_tmp2
  else
    # This check is for when running the sl() command,
    # and the remote host got its type misidentified.
    _tmp2=$_tmp/../brc2
    if [[ -s $_tmp2 ]]; then
      # shellcheck source=./brc2
      source $_tmp2
    fi
  fi
fi
# ensure no bad programs appending to this file will have an affect
return 0