lib/perl5/5.6.1/dotsh.pl

   1 #
   2 #   @(#)dotsh.pl                                               03/19/94
   3 #
   4 # This library is no longer being maintained, and is included for backward
   5 # compatibility with Perl 4 programs which may require it.
   6 #
   7 # In particular, this should not be used as an example of modern Perl
   8 # programming techniques.
   9 #
  10 #
  11 #   Author: Charles Collins
  12 #
  13 #   Description:
  14 #      This routine takes a shell script and 'dots' it into the current perl
  15 #      environment. This makes it possible to use existing system scripts
  16 #      to alter environment variables on the fly.
  17 #
  18 #   Usage:
  19 #      &dotsh ('ShellScript', 'DependentVariable(s)');
  20 #
  21 #         where
  22 #
  23 #      'ShellScript' is the full name of the shell script to be dotted
  24 #
  25 #      'DependentVariable(s)' is an optional list of shell variables in the
  26 #         form VARIABLE=VALUE,VARIABLE=VALUE,... that 'ShellScript' is
  27 #         dependent upon. These variables MUST be defined using shell syntax.
  28 #
  29 #   Example:
  30 #      &dotsh ('/tmp/foo', 'arg1');
  31 #      &dotsh ('/tmp/foo');
  32 #      &dotsh ('/tmp/foo arg1 ... argN');
  33 #
  34 sub dotsh {
  35    local(@sh) = @_;
  36    local($tmp,$key,$shell,$command,$args,$vars) = '';
  37    local(*dotsh);
  38    undef *dotsh;
  39    $dotsh = shift(@sh);
  40    @dotsh = split (/\s/, $dotsh);
  41    $command = shift (@dotsh);
  42    $args = join (" ", @dotsh);
  43    $vars = join ("\n", @sh);
  44    open (_SH_ENV, "$command") || die "Could not open $dotsh!\n";
  45    chop($_ = <_SH_ENV>);
  46    $shell = "$1 -c" if ($_ =~ /^\#\!\s*(\S+(\/sh|\/ksh|\/zsh|\/csh))\s*$/);
  47    close (_SH_ENV);
  48    if (!$shell) {
  49       if ($ENV{'SHELL'} =~ /\/sh$|\/ksh$|\/zsh$|\/bash$|\/csh$/) {
  50          $shell = "$ENV{'SHELL'} -c";
  51       } else {
  52          print "SHELL not recognized!\nUsing /bin/sh...\n";
  53          $shell = "/bin/sh -c";
  54       }
  55    }
  56    if (length($vars) > 0) {
  57       system "$shell \"$vars;. $command $args; set > /tmp/_sh_env$$\"";
  58    } else {
  59       system "$shell \". $command $args; set > /tmp/_sh_env$$\"";
  60    }
  61
  62    open (_SH_ENV, "/tmp/_sh_env$$") || die "Could not open /tmp/_sh_env$$!\n";
  63    while (<_SH_ENV>) {
  64        chop;
  65        m/^([^=]*)=(.*)/s;
  66        $ENV{$1} = $2;
  67    }
  68    close (_SH_ENV);
  69    system "rm -f /tmp/_sh_env$$";
  70
  71    foreach $key (keys(%ENV)) {
  72        $tmp .= "\$$key = \$ENV{'$key'};" if $key =~ /^[A-Za-z]\w*$/;
  73    }
  74    eval $tmp;
  75 }
  76 1;