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- #
- # @(#)dotsh.pl 03/19/94
- #
- # This library is no longer being maintained, and is included for backward
- # compatibility with Perl 4 programs which may require it.
- #
- # In particular, this should not be used as an example of modern Perl
- # programming techniques.
- #
- #
- # Author: Charles Collins
- #
- # Description:
- # This routine takes a shell script and 'dots' it into the current perl
- # environment. This makes it possible to use existing system scripts
- # to alter environment variables on the fly.
- #
- # Usage:
- # &dotsh ('ShellScript', 'DependentVariable(s)');
- #
- # where
- #
- # 'ShellScript' is the full name of the shell script to be dotted
- #
- # 'DependentVariable(s)' is an optional list of shell variables in the
- # form VARIABLE=VALUE,VARIABLE=VALUE,... that 'ShellScript' is
- # dependent upon. These variables MUST be defined using shell syntax.
- #
- # Example:
- # &dotsh ('/tmp/foo', 'arg1');
- # &dotsh ('/tmp/foo');
- # &dotsh ('/tmp/foo arg1 ... argN');
- #
- sub dotsh {
- local(@sh) = @_;
- local($tmp,$key,$shell,$command,$args,$vars) = '';
- local(*dotsh);
- undef *dotsh;
- $dotsh = shift(@sh);
- @dotsh = split (/\s/, $dotsh);
- $command = shift (@dotsh);
- $args = join (" ", @dotsh);
- $vars = join ("\n", @sh);
- open (_SH_ENV, "$command") || die "Could not open $dotsh!\n";
- chop($_ = <_SH_ENV>);
- $shell = "$1 -c" if ($_ =~ /^\#\!\s*(\S+(\/sh|\/ksh|\/zsh|\/csh))\s*$/);
- close (_SH_ENV);
- if (!$shell) {
- if ($ENV{'SHELL'} =~ /\/sh$|\/ksh$|\/zsh$|\/bash$|\/csh$/) {
- $shell = "$ENV{'SHELL'} -c";
- } else {
- print "SHELL not recognized!\nUsing /bin/sh...\n";
- $shell = "/bin/sh -c";
- }
- }
- if (length($vars) > 0) {
- system "$shell \"$vars;. $command $args; set > /tmp/_sh_env$$\"";
- } else {
- system "$shell \". $command $args; set > /tmp/_sh_env$$\"";
- }
-
- open (_SH_ENV, "/tmp/_sh_env$$") || die "Could not open /tmp/_sh_env$$!\n";
- while (<_SH_ENV>) {
- chop;
- m/^([^=]*)=(.*)/s;
- $ENV{$1} = $2;
- }
- close (_SH_ENV);
- system "rm -f /tmp/_sh_env$$";
-
- foreach $key (keys(%ENV)) {
- $tmp .= "\$$key = \$ENV{'$key'};" if $key =~ /^[A-Za-z]\w*$/;
- }
- eval $tmp;
- }
- 1;
-