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author | Eric Sunshine <sunshine@sunshineco.com> | 2018-07-13 01:52:05 -0400 |
---|---|---|
committer | Junio C Hamano <gitster@pobox.com> | 2018-07-16 14:55:01 -0700 |
commit | a0a630192dca77794b2ea94aeb2e6dff0cc1810b (patch) | |
tree | 8578141f292e066bc5df620947e5c05e3fe4c77c | |
parent | t/check-non-portable-shell: make error messages more compact (diff) | |
download | tgif-a0a630192dca77794b2ea94aeb2e6dff0cc1810b.tar.xz |
t/check-non-portable-shell: detect "FOO=bar shell_func"
One-shot environment variable assignments, such as 'FOO' in
"FOO=bar cmd", exist only during the invocation of 'cmd'. However, if
'cmd' happens to be a shell function, then 'FOO' is assigned in the
executing shell itself, and that assignment remains until the process
exits (unless explicitly unset). Since this side-effect of
"FOO=bar shell_func" is unlikely to be intentional, detect and report
such usage.
To distinguish shell functions from other commands, perform a pre-scan
of shell scripts named as input, gleaning a list of function names by
recognizing lines of the form (loosely matching whitespace):
shell_func () {
and later report suspect lines of the form (loosely matching quoted
values):
FOO=bar [BAR=foo ...] shell_func
Also take care to stitch together incomplete lines (those ending with
"\") since suspect invocations may be split over multiple lines:
FOO=bar BAR=foo \
shell_func
Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rwxr-xr-x | t/check-non-portable-shell.pl | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/t/check-non-portable-shell.pl b/t/check-non-portable-shell.pl index f6dbe28b19..d5823f71d8 100755 --- a/t/check-non-portable-shell.pl +++ b/t/check-non-portable-shell.pl @@ -7,17 +7,34 @@ use strict; use warnings; my $exit_code=0; +my %func; sub err { my $msg = shift; s/^\s+//; s/\s+$//; + s/\s+/ /g; print "$ARGV:$.: error: $msg: $_\n"; $exit_code = 1; } +# glean names of shell functions +for my $i (@ARGV) { + open(my $f, '<', $i) or die "$0: $i: $!\n"; + while (<$f>) { + $func{$1} = 1 if /^\s*(\w+)\s*\(\)\s*{\s*$/; + } + close $f; +} + while (<>) { chomp; + # stitch together incomplete lines (those ending with "\") + while (s/\\$//) { + $_ .= readline; + chomp; + } + /\bsed\s+-i/ and err 'sed -i is not portable'; /\becho\s+-[neE]/ and err 'echo with option is not portable (use printf)'; /^\s*declare\s+/ and err 'arrays/declare not portable'; @@ -25,6 +42,8 @@ while (<>) { /\btest\s+[^=]*==/ and err '"test a == b" is not portable (use =)'; /\bwc -l.*"\s*=/ and err '`"$(wc -l)"` is not portable (use test_line_count)'; /\bexport\s+[A-Za-z0-9_]*=/ and err '"export FOO=bar" is not portable (use FOO=bar && export FOO)'; + /^\s*([A-Z0-9_]+=(\w+|(["']).*?\3)\s+)+(\w+)/ and exists($func{$4}) and + err '"FOO=bar shell_func" assignment extends beyond "shell_func"'; # this resets our $. for each file close ARGV if eof; } |