# Copyright (C) 2016 Ian Kelling

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# 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.  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.

# assume we want ssh commands to source this file if we are sourcing it,
# and we haven't specified otherwise already
[[ ! $BASH_LOGIN_SHELL ]] && export BASH_LOGIN_SHELL=true
#BASH_LOGIN_SHELL=false # temporary override

# first conditions show that we are an ssh command without an interactive shell
if [[ $SSH_CONNECTION ]] \
       && [[ $- == *c* ]] \
       && [[ ! $SSH_TTY ]] \
       && [[ $- != *i* ]] \
       && [[ ! $BASH_LOGIN_SHELL == true ]]; then
    return 0
else
    if [[ -r /etc/profile ]]; then
        source /etc/profile
    fi
    _x=$(readlink -f $BASH_SOURCE)
    _x=${_x%/*}/brc
    if [[ -r $_x ]]; then
        source $_x
    fi
fi
# ensure no bad programs appending to this file will have an affect
return 0