support/lsh.sh

   1 #!/bin/sh
   2 # This script can be used as a "remote shell" command that is only
   3 # capable of pretending to connect to "localhost".  This is useful
   4 # for testing or for running a local copy where the sender and the
   5 # receiver needs to use different options (e.g. --fake-super).  If
   6 # we get a -l USER option, we try to use "sudo -u USER" to run the
   7 # command.  Supports only the hostnames "localhost" and "lh", with
   8 # the latter implying the --no-cd option.
   9
  10 user=''
  11 do_cd=y # Default path is user's home dir (just like ssh) unless host is "lh".
  12
  13 while : ; do
  14     case "$1" in
  15     -l) user="$2"; shift; shift ;;
  16     -l*) user=`echo "$1" | sed 's/^-l//'`; shift ;;
  17     --no-cd) do_cd=n; shift ;;
  18     -*) shift ;;
  19     localhost) shift; break ;;
  20     lh) do_cd=n; shift; break ;;
  21     *) echo "lsh: unable to connect to host $1" 1>&2; exit 1 ;;
  22     esac
  23 done
  24
  25 if [ "$user" ]; then
  26     prefix=''
  27     if [ $do_cd = y ]; then
  28         home=`perl -e "print((getpwnam('$user'))[7])"`
  29         prefix="cd '$home' &&"
  30     fi
  31     sudo -H -u "$user" sh -c "$prefix $*"
  32 else
  33     if [ $do_cd = y ]; then
  34         cd || exit 1
  35     fi
  36     eval "${@}"
  37 fi