116 lines
2.3 KiB
Perl
Executable File
116 lines
2.3 KiB
Perl
Executable File
#!/usr/bin/perl
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# Given a filename on the command line or on stdin this script returns
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# the (single) interpreter that is required to run the executable. We
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# need this information to pick the best dependency parser for this
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# file.
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# Usually this is extracted from the #! line of the file
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# but we also handle the various 'exec' tricks that people use to
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# start the interpreter via an intermediate shell.
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# These have all been seen on our system or are "recommended" in
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# various man pages.
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# Examples:
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# #!/bin/sh
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# # the next line restarts using wish \
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# exec wish "$0" "$@"
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# #!/bin/sh -- # -*- perl -*- -p
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# eval 'exec /usr/bin/perl -wS $0 ${1+"$@"}'
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# if $running_under_some_shell;
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# #!/bin/sh -- # -*- perl -*- -p
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# eval '(exit $?0)' && eval 'exec /usr/bin/perl -wS $0 ${1+"$@"}'
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# #!/bin/sh -- # -*- perl -*- -p
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# & eval 'exec /usr/bin/perl -wS $0 $argv:q'
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# if $running_under_some_shell;
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# #! /usr/bin/env python
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use File::Basename;
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if ("@ARGV") {
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foreach (@ARGV) {
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process_file($_);
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}
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} else {
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# notice we are passed a list of filenames NOT as common in unix the
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# contents of the file.
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foreach (<>) {
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process_file($_);
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}
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}
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foreach $prog (sort keys %require) {
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$prog=basename($prog);
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# ignore variable interpolation and any program whose name is made
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# up only of non word characters ('<', '&&', etc).
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( ( $prog != /\$/ ) || ( $prog =~ /^\W+$/ ) ) &&
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next;
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print "exectuable($prog)\n";
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}
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exit 0;
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sub process_file {
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my ($file) = @_;
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chomp $file;
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my ($version, $magic) = ();
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(-f $file) || return ;
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open(FILE, "<$file")||
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die("$0: Could not open file: '$file' : $!\n");
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my $rc = sysread(FILE,$line,1000);
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$rc =~ s/\#.*\n//g;
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# Ignore all parameter substitution.
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# I have no hope of parsing something like:
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# exec ${SHELL:-/bin/sh}
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$rc =~ s/\$\{.*\}//g;
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$rc =~ s/echo\s+.*[\n;]//g;
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if ( ($rc > 1) && ($line =~ m/^\#\!\s*/) ) {
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if ($line =~ m/\b(exec|env)\s+([\'\"\`\\]+)?([^ \t\n\r]+)/) {
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$require{$3} = 1;
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last;
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}
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# strip off extra lines and any arguments
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if ($line =~ m/^\#\!\s*([^ \t\n\r]+)/) {
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$require{$1} = 1;
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last;
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}
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}
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close(FILE) ||
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die("$0: Could not close file: '$file' : $!\n");
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return ;
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}
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