Use of SHELL env var by login

Linda Walsh cygwin@tlinx.org
Tue Sep 27 17:22:00 GMT 2016


Andrey Repin wrote:
> Greetings, Linda Walsh!

>>         Windows *doesn't* use "SHELL" to set your command line, it uses
>> COMSPEC.
> 
> Do note I didn't mention any specific variable names.
---
Indeed -- wanted to be explicit for those not know that the space
in-between the lines is important! ;-)

> And I've explicitly outlined exactly the case you are describing in your post
> - integration.
> If you indeed have "more other" applications (native ports of certain tools,
> which still use environment as a go-to reference sources), then by all means,
> do what you find best for you.
> I do that all the time, too, but I also have Cygwin itself configured to match
> the environment I expect to have. Just to avoid issues.
---
	Yup -- I use the same site-wide login scripts (for me & root and
multi-machine) on linux and cygwin and regularly make sure to copy and test
them on both -- not to mean I don't have cygwin specific sections that
key off OS:
  if ! type -f cygwin 2>/dev/null ; then 
    read SYSTEM_KERNEL HOSTNAME OSTYPE <<<"$($_prg_uname -sno)"
    if [[ $OSTYPE =~ Cygwin ]]; then sub cygwin () { return 0; }
    else sub cygwin () { return 1; }
    fi
    export -f cygwin
  fi
# and some cygwin-only defs in /etc/local/cygwin, like
alias gvim='setsid gvim'              # ensure win-native vim backgrounds properly

and a version of "mklink" that runs in bash and uses the
*nix syntax of "mklink <from> <to>" (and auto-handles directories)

--------------------------------------------

#!/bin/bash 
#set -x
shopt -s expand_aliases extglob sourcepath

##
## func to help determine if we were called as script or lib &
## not dirty env if called as lib
##
function conditional_setprog {
  local lprogpath="$0"
  [[ $lprogpath =~ .*bash.* ]]  && { lprogpath="$1"; shift; }
  local lprog="${lprogpath##*/}" lprogdir="${lprogpath%/*}"
  local lprogname="${lprog%.*}"
  if [[ $lprogname =~ errnos ]]; then
    declare -g prog="$lprog" progpath="$lprogpath" progname="$lprogname"
  fi
}
conditional_setprog "$@"

#include stdalias
#include errnos
# --  include needed bits for fewer includes
alias intConst=declare\ -ir sub=function my=declare int=declare\ -i
intConst ENOENT=2 EEXIST=17 ENOSYS=38 ENOMSG=42


sub mklink ()  {
  sub err_ex {
    my err="${!1}" msg="$2"
    echo "$msg" >&2
    return $err
  }
  if (($#!=2)) && [[ ! $0 =~ bash ]] ; then 
    echo "mklink <from> <to-path|.>   # (destination must not exist)" >&2
  fi
  local src=${1%/.} dst=${2%/.}; src=${src%/}
  [[ $dst == . ]] && dst="${src##*/}"
  [[ -e $dst ]] && {
    err_ex EEXIST "Destination, \"$dst\", already exists."
    return 
  }
  [[ -e $src ]] || { 
    err_ex ENOENT "Source, \"$src\", does not exist."
    return
  }
  local dest_type="unknown"
  if [[ -f $src ]]; then dest_type=""
  elif [[ -d $src ]]; then dest_type="/d"
  else
    err_ex ENOSYS "Cannot determine src, \"$src\" as file or dir"
    return
  fi
  local winsrc windst
  printf -v winsrc "%s" "$(cygpath -wl "$src")"
  printf -v windst "%s" "$(cygpath -wl "$dst")"
  # windows reverses everything *nix
  # just to be different from CP/M which modeled Unix
  printf -v cmd 'cmd /c mklink %s "%q" "%q"' "$dest_type" "$windst" "$winsrc"
  eval "$cmd"
  (($?)) && err_ex ENOMSG "Windows return unexpected status($status)"
}
export -f mklink

(($#==0)) ||  [[ $0 =~ bash ]] || mklink "$@"
# vim: ts=2 sw=2
--------------------------

-linda

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