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

   1 #!/bin/bash
   2 # Copyright (C) 2019 Ian Kelling
   3 # SPDX-License-Identifier: AGPL-3.0-or-later
   4
   5 # to debug
   6 #set -x
   7 # redirect output to log file. this doesn't work. todo figure out why
   8 #exec 1>>/a/tmp/bashlog
   9 #exec 2>>/a/tmp/bashlog
  10
  11
  12 # By default this file is sourced for ALL ssh commands. This is wonky.
  13 # Normally, this file is not sourced when a script is run, but we can
  14 # override that by having #!/bin/bash -l.  I want something similar for ssh
  15 # commands. when a local script runs an ssh command, this file should not be
  16 # sourced by default, but we should be able to override that.
  17 #
  18 # So here we test for conditions of a script under ssh and return if so.
  19 # And we don't keep the rest of the code in this file, because even
  20 # though we return, we already parsed the whole code, and as I develop
  21 # the code, the parsing can have errors, which can screw up cronjobs
  22 # etc.
  23 #
  24 # To test for an overriding condition, we have a few options. one is to
  25 # use an environment variable.  env variables sent across ssh are
  26 # strictly limited. ssh -t which sets $SSH_TTY, but within a script that
  27 # won't work because tty allocation will fail. However, I do use -t for
  28 # strange hosts, so we consider it an indicator. We could override an
  29 # obscure unused LC_var, like telephone, but I don't want to run into
  30 # some edge case where that messes things up. we could transfer a file
  31 # which we could test for, but I can't think of a way to make that
  32 # inherently limited to a single ssh command.  I choose to set SendEnv
  33 # and AcceptEnv ssh config vars to allow the environment variable
  34 # BASH_LOGIN_SHELL to propagate across ssh. This also requires that we
  35 # wrap ssh in interactive shells, because, once we export the var, it
  36 # will go into scripts, and we want it to be nondefault there.
  37 #
  38 # -c is set whenever a command is passed to ssh
  39 # -i is set whenever a command is not passed
  40 if [[ $SSH_CONNECTION ]] \
  41      && [[ $- == *c* ]] \
  42      && [[ $- != *i* ]] \
  43      && { [[ ! $SSH_TTY ]] || [[ $BASH_LOGIN_SHELL == false ]] ; } ; then
  44   return 0
  45 else
  46
  47   # the distinction between login and non-login shells is lame,
  48   # get rid of it. note ssh shells normally its login if a command is passed
  49   if ! shopt -q login_shell; then
  50     if [[ -r /etc/profile ]]; then
  51       source /etc/profile
  52     fi
  53     # note, this is not exactly the same as a login shell, because that
  54     # reads ~/.bash_profile or alternative, which usually just sources
  55     # this file, and we don't want to do that and cause an infinite
  56     # loop.
  57   fi
  58   _x=$(readlink -f ${BASH_SOURCE[0]})
  59   _x=${_x%/*}/brc
  60   if [[ -r $_x ]]; then
  61     # shellcheck source=./brc
  62     source $_x
  63   fi
  64   # brc2 is for things i dont necessarily want on every system
  65   _x=${_x%/*}/brc2
  66   if [[ -r $_x ]]; then
  67     # shellcheck source=./brc2
  68     source $_x
  69   fi
  70 fi
  71 # ensure no bad programs appending to this file will have an affect
  72 return 0