check-non-portable-shell: support Perl versions older than 5.10
[git/git.git] / t / check-non-portable-shell.pl
1 #!/usr/bin/perl
2
3 # Test t0000..t9999.sh for non portable shell scripts
4 # This script can be called with one or more filenames as parameters
5
6 use strict;
7 use warnings;
8
9 my $exit_code=0;
10 my %func;
11
12 sub err {
13 my $msg = shift;
14 s/^\s+//;
15 s/\s+$//;
16 s/\s+/ /g;
17 print "$ARGV:$.: error: $msg: $_\n";
18 $exit_code = 1;
19 }
20
21 # glean names of shell functions
22 for my $i (@ARGV) {
23 open(my $f, '<', $i) or die "$0: $i: $!\n";
24 while (<$f>) {
25 $func{$1} = 1 if /^\s*(\w+)\s*\(\)\s*{\s*$/;
26 }
27 close $f;
28 }
29
30 my $line = '';
31 while (<>) {
32 chomp;
33 $line .= $_;
34 # stitch together incomplete lines (those ending with "\")
35 next if $line =~ s/\\$//;
36
37 $_ = $line;
38 /\bcp\s+-a/ and err 'cp -a is not portable';
39 /\bsed\s+-[^efn]\s+/ and err 'sed option not portable (use only -n, -e, -f)';
40 /\becho\s+-[neE]/ and err 'echo with option is not portable (use printf)';
41 /^\s*declare\s+/ and err 'arrays/declare not portable';
42 /^\s*[^#]\s*which\s/ and err 'which is not portable (use type)';
43 /\btest\s+[^=]*==/ and err '"test a == b" is not portable (use =)';
44 /\bwc -l.*"\s*=/ and err '`"$(wc -l)"` is not portable (use test_line_count)';
45 /\bhead\s+-c\b/ and err 'head -c is not portable (use test_copy_bytes BYTES <file >out)';
46 /(?:\$\(seq|^\s*seq\b)/ and err 'seq is not portable (use test_seq)';
47 /\bgrep\b.*--file\b/ and err 'grep --file FILE is not portable (use grep -f FILE)';
48 /\bexport\s+[A-Za-z0-9_]*=/ and err '"export FOO=bar" is not portable (use FOO=bar && export FOO)';
49 /^\s*([A-Z0-9_]+=(\w+|(["']).*?\3)\s+)+(\w+)/ and exists($func{$4}) and
50 err '"FOO=bar shell_func" assignment extends beyond "shell_func"';
51 $line = '';
52 # this resets our $. for each file
53 close ARGV if eof;
54 }
55 exit $exit_code;