iankelling.org Git - distro-setup/blob - .bashrc

   1 # Copyright (C) 2016 Ian Kelling
   2
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6
   7 #     http://www.apache.org/licenses/LICENSE-2.0
   8
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 # to debug
  16 #set -x
  17 # redirect output to log file. this doesn't work. todo figure out why
  18 #exec 1>>/a/tmp/bashlog
  19 #exec 2>>/a/tmp/bashlog
  20
  21
  22 # By default this file is sourced for ALL ssh commands. This is wonky.
  23 # Normally, this file is not sourced when a script is run, but we can
  24 # override that by having #!/bin/bash -l.  I want something similar for ssh
  25 # commands. when a local script runs an ssh command, this file should not be
  26 # sourced by default, but we should be able to override that.
  27 #
  28 # So here we test for conditions of a script under ssh and return if so.
  29 # And we don't keep the rest of the code in this file, because even
  30 # though we return, we already parsed the whole code, and as I develop
  31 # the code, the parsing can have errors, which can screw up cronjobs
  32 # etc. To test for an overriding condition, we have a few options. one
  33 # is to use an environment variable.  env variables sent across ssh are
  34 # strictly limited. ssh -t which sets $SSH_TTY, but within a script that
  35 # won't work because tty allocation will fail.  We could override an
  36 # obscure unused LC_var, like telephone, but I don't want to run into
  37 # some edge case where that messes things up. we could transfer a file
  38 # which we could test for, but I can't think of a way to make that
  39 # inherently limited to a single ssh command.  I choose to set SendEnv
  40 # and AcceptEnv ssh config vars to allow the environment variable
  41 # BASH_LOGIN_SHELL to propagate across ssh. This also requires that we
  42 # wrap ssh in interactive shells, because, once we export the var, it
  43 # will go into scripts and theres no way to automatically set it.
  44
  45
  46 # first conditions show that we are an ssh command without an interactive shell
  47 if [[ $SSH_CONNECTION ]] \
  48        && [[ $- == *c* ]] \
  49        && [[ ! $SSH_TTY ]] \
  50        && [[ $- != *i* ]] \
  51        && [[ $BASH_LOGIN_SHELL != true ]]; then
  52     return 0
  53 else
  54     if [[ -r /etc/profile ]]; then
  55         source /etc/profile
  56     fi
  57     _x=$(readlink -f $BASH_SOURCE)
  58     _x=${_x%/*}/brc
  59     if [[ -r $_x ]]; then
  60         source $_x
  61     fi
  62 fi
  63 # ensure no bad programs appending to this file will have an affect
  64 return 0