/usr/share/lintian/checks/scripts is in lintian 2.5.10.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# This is probably the right file to add a check for the use of
# set -e in bash and sh scripts.
#
# Copyright (C) 1998 Richard Braakman
# Copyright (C) 2002 Josip Rodin
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, you can find it on the World Wide
# Web at http://www.gnu.org/copyleft/gpl.html, or write to the Free
# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.
package Lintian::scripts;
use strict;
use warnings;
use Lintian::Check qw($known_shells_regex);
use Lintian::Data;
use Lintian::Relation;
use Lintian::Tags qw(tag);
use Lintian::Util qw(fail);
# This is a map of all known interpreters. The key is the interpreter
# name (the binary invoked on the #! line). The value is an anonymous
# array of two elements. The first argument is the path on a Debian
# system where that interpreter would be installed. The second
# argument is the dependency that provides that interpreter.
#
# $INTERPRETERS maps names of (unversioned) interpreters to the path
# they are installed and what package to depend on to use them.
#
my $INTERPRETERS = Lintian::Data->new ('scripts/interpreters', qr/\s*=\>\s*/o,
\&_parse_interpreters);
# The more complex case of interpreters that may have a version number.
#
# This is a hash from the base interpreter name to a list. The base
# interpreter name may appear by itself or followed by some combination of
# dashes, digits, and periods.
#
# The list contains the following values:
# [<path>, <dependency-relation>, <regex>, <dependency-templatel>, <version-list>]
#
# Their meaning is documented in Lintian's scripts/versioned-interpreters
# file, though they are ordered differently and there are a few differences
# as described below:
#
# * <regex> has been passed through qr/^<value>$/
# * If <dependency-relation> was left out, it has been substituted by the
# interpreter.
# * The magic values of <dependency-relation> are represented as:
# @NO_DEFAULT_DEPS@ -> '' (i.e. an empty string)
# @SKIP_UNVERSIONED@ -> undef (i.e the undefined value)
# * <version-list> has been split into a list of versions.
# (e.g. "1.6 1.8" will be ["1.6", "1.8"])
#
# A full example is:
#
# data:
# lua => /usr/bin, lua([\d.]+), 'lua$1', 40 50 5.1
#
# $VERSIONED_INTERPRETERS->value ('lua') is
# [ '/usr/bin', 'lua', qr/^lua([\d.]+)$/, 'lua$1', ["40", "50", "5.1"] ]
#
my $VERSIONED_INTERPRETERS = Lintian::Data->new ('scripts/versioned-interpreters', qr/\s*=\>\s*/o,
\&_parse_versioned_interpreters);
# Any of the following packages can satisfy an update-inetd dependency.
my $update_inetd
= join (' | ', qw(update-inetd inet-superserver openbsd-inetd
inetutils-inetd rlinetd xinetd));
# Appearance of one of these regexes in a maintainer script means that there
# must be a dependency (or pre-dependency) on the given package. The tag
# reported is maintainer-script-needs-depends-on-%s, so be sure to update
# scripts.desc when adding a new rule.
my @depends_needed = (
[ adduser => '\badduser\s' ],
[ gconf2 => '\bgconf-schemas\s' ],
[ $update_inetd => '\bupdate-inetd\s' ],
[ ucf => '\bucf\s' ],
[ 'xml-core' => '\bupdate-xmlcatalog\s' ],
);
# When detecting commands inside shell scripts, use this regex to match the
# beginning of the command rather than checking whether the command is at the
# beginning of a line.
my $LEADIN = qr'(?:(?:^|[`&;(|{])\s*|(?:if|then|do|while)\s+)';
my @bashism_single_quote_regexs = (
$LEADIN . qr'echo\s+(?:-[^e\s]+\s+)?\'[^\']*(\\[abcEfnrtv0])+.*?[\']',
# unsafe echo with backslashes
$LEADIN . qr'source\s+[\"\']?(?:\.\/|\/|\$|[\w~.-])\S*',
# should be '.', not 'source'
);
my @bashism_string_regexs = (
qr'\$\[\w+\]', # arith not allowed
qr'\$\{\w+\:\d+(?::\d+)?\}', # ${foo:3[:1]}
qr'\$\{\w+(/.+?){1,2}\}', # ${parm/?/pat[/str]}
qr'\$\{\#?\w+\[[0-9\*\@]+\]\}',# bash arrays, ${name[0|*|@]}
qr'\$\{!\w+[\@*]\}', # ${!prefix[*|@]}
qr'\$\{!\w+\}', # ${!name}
qr'(\$\(|\`)\s*\<\s*\S+\s*(\)|\`)', # $(\< foo) should be $(cat foo)
qr'\$\{?RANDOM\}?\b', # $RANDOM
qr'\$\{?(OS|MACH)TYPE\}?\b', # $(OS|MACH)TYPE
qr'\$\{?HOST(TYPE|NAME)\}?\b', # $HOST(TYPE|NAME)
qr'\$\{?DIRSTACK\}?\b', # $DIRSTACK
qr'\$\{?EUID\}?\b', # $EUID should be "id -u"
qr'\$\{?UID\}?\b', # $UID should be "id -ru"
qr'\$\{?SECONDS\}?\b', # $SECONDS
qr'\$\{?BASH_[A-Z]+\}?\b', # $BASH_SOMETHING
qr'\$\{?SHELLOPTS\}?\b', # $SHELLOPTS
qr'\$\{?PIPESTATUS\}?\b', # $PIPESTATUS
qr'\$\{?SHLVL\}?\b', # $SHLVL
qr'<<<', # <<< here string
$LEADIN . qr'echo\s+(?:-[^e\s]+\s+)?\"[^\"]*(\\[abcEfnrtv0])+.*?[\"]',
# unsafe echo with backslashes
);
my @bashism_regexs = (
qr'(?:^|\s+)function \w+(\s|\(|\Z)', # function is useless
qr'(test|-o|-a)\s*[^\s]+\s+==\s', # should be 'b = a'
qr'\[\s+[^\]]+\s+==\s', # should be 'b = a'
qr'\s(\|\&)', # pipelining is not POSIX
qr'[^\\\$]\{(?:[^\s\\\}]*?,)+[^\\\}\s]*\}', # brace expansion
qr'(?:^|\s+)\w+\[\d+\]=', # bash arrays, H[0]
$LEADIN . qr'read\s+(?:-[a-qs-zA-Z\d-]+)',
# read with option other than -r
$LEADIN . qr'read\s*(?:-\w+\s*)*(?:\".*?\"|[\'].*?[\'])?\s*(?:;|$)',
# read without variable
qr'\&>', # cshism
qr'(<\&|>\&)\s*((-|\d+)[^\s;|)`&\\\\]|[^-\d\s]+)', # should be >word 2>&1
qr'\[\[(?!:)', # alternative test command
$LEADIN . qr'select\s+\w+', # 'select' is not POSIX
$LEADIN . qr'echo\s+(-n\s+)?-n?en?', # echo -e
$LEADIN . qr'exec\s+-[acl]', # exec -c/-l/-a name
qr'(?:^|\s+)let\s', # let ...
qr'(?<![\$\(])\(\(.*\)\)', # '((' should be '$(('
qr'\$\[[^][]+\]', # '$[' should be '$(('
qr'(\[|test)\s+-a', # test with unary -a (should be -e)
qr'/dev/(tcp|udp)', # /dev/(tcp|udp)
$LEADIN . qr'\w+\+=', # should be "VAR="${VAR}foo"
$LEADIN . qr'suspend\s',
$LEADIN . qr'caller\s',
$LEADIN . qr'complete\s',
$LEADIN . qr'compgen\s',
$LEADIN . qr'declare\s',
$LEADIN . qr'typeset\s',
$LEADIN . qr'disown\s',
$LEADIN . qr'builtin\s',
$LEADIN . qr'set\s+-[BHT]+', # set -[BHT]
$LEADIN . qr'alias\s+-p', # alias -p
$LEADIN . qr'unalias\s+-a', # unalias -a
$LEADIN . qr'local\s+-[a-zA-Z]+', # local -opt
qr'(?:^|\s+)\s*\(?\w*[^\(\w\s]+\S*?\s*\(\)\s*([\{|\(]|\Z)',
# function names should only contain [a-z0-9_]
$LEADIN . qr'(push|pop)d(\s|\Z)', # (push|pod)d
$LEADIN . qr'export\s+-[^p]', # export only takes -p as an option
$LEADIN . qr'ulimit(\s|\Z)',
$LEADIN . qr'shopt(\s|\Z)',
$LEADIN . qr'type\s',
$LEADIN . qr'time\s',
$LEADIN . qr'dirs(\s|\Z)',
qr'(?:^|\s+)[<>]\(.*?\)', # <() process substituion
qr'(?:^|\s+)readonly\s+-[af]', # readonly -[af]
$LEADIN . qr'(sh|\$\{?SHELL\}?) -[rD]', # sh -[rD]
$LEADIN . qr'(sh|\$\{?SHELL\}?) --\w+', # sh --long-option
$LEADIN . qr'(sh|\$\{?SHELL\}?) [-+]O', # sh [-+]O
);
# a local function to help use separate tags for example scripts
sub script_tag {
my( $tag, $filename, @rest ) = @_;
$tag = "example-$tag"
if $filename and $filename =~ m,usr/share/doc/[^/]+/examples/,;
tag( $tag, $filename, @rest );
}
sub run {
my %executable = ();
my %ELF = ();
my %scripts = ();
# no dependency for install-menu, because the menu package specifically
# says not to depend on it.
my $pkg = shift;
my $type = shift;
my $info = shift;
foreach my $file ($info->sorted_index) {
next if $file eq '';
$ELF{$file} = 1 if $info->file_info->{$file} =~ /^[^,]*\bELF\b/o;
my $index_info = $info->index->{$file};
my $operm = $index_info->operm;
next unless $index_info->is_file and ($operm & 0111);
$executable{$file} = 1;
}
my $all_parsed = Lintian::Relation->and ($info->relation ('all'),
$info->relation ('provides'),
$pkg);
my $str_deps = $info->relation('strong');
for my $filename (sort keys %{$info->scripts}) {
my $interpreter = $info->scripts->{$filename}->{interpreter};
my $calls_env = $info->scripts->{$filename}->{calls_env};
my $path;
$scripts{$filename} = 1;
my $in_docs = $filename =~ m,usr/share/doc/,;
my $in_examples = $filename =~ m,usr/share/doc/[^/]+/examples/,;
# no checks necessary at all for scripts in /usr/share/doc/
# unless they are examples
next if $in_docs and !$in_examples;
my ($base) = $interpreter =~ m,([^/]*)$,;
# allow exception for .in files that have stuff like #!@PERL@
next if ($filename =~ m,\.in$, and $interpreter =~ m,^(\@|<\<)[A-Z_]+(\@|>\>)$,);
my $is_absolute = ($interpreter =~ m,^/, or defined $calls_env);
# Skip files that have the #! line, but are not executable and do not have
# an absolute path and are not in a bin/ directory (/usr/bin, /bin etc)
# They are probably not scripts after all.
next if ($filename !~ m,(bin/|etc/init\.d/), and !$executable{$filename}
and !$is_absolute and !$in_examples);
# Example directories sometimes contain Perl libraries, and some people
# use initial lines like #!perl or #!python to provide editor hints, so
# skip those too if they're not executable. Be conservative here, since
# it's not uncommon for people to both not set examples executable and not
# fix the path and we want to warn about that.
next if ($filename =~ /\.pm\z/ and !$executable{$filename}
and !$is_absolute and $in_examples);
if ($interpreter eq '') {
script_tag('script-without-interpreter', $filename);
next;
}
# Either they use an absolute path or they use '/usr/bin/env interp'.
script_tag('interpreter-not-absolute', $filename, "#!$interpreter")
unless $is_absolute;
tag 'script-not-executable', $filename
unless ($executable{$filename}
or $filename =~ m,^usr/(lib|share)/.*\.pm,
or $filename =~ m,^usr/(lib|share)/.*\.py,
or $filename =~ m,^usr/(lib|share)/ruby/.*\.rb,
or $filename =~ m,^usr/share/debconf/confmodule(?:\.sh)?$,
or $filename =~ m,\.in$,
or $filename =~ m,\.erb$,
or $filename =~ m,\.ex$,
or $filename eq 'etc/init.d/skeleton'
or $filename =~ m,^etc/menu-methods,
or $filename =~ m,^etc/X11/Xsession\.d,)
or $in_docs;
# Warn about csh scripts.
tag 'csh-considered-harmful', $filename
if (($base eq 'csh' or $base eq 'tcsh')
and $executable{$filename}
and $filename !~ m,^etc/csh/login\.d/,)
and !$in_docs;
$path = $info->unpacked($filename);
# Syntax-check most shell scripts, but don't syntax-check scripts that end
# in .dpatch. bash -n doesn't stop checking at exit 0 and goes on to blow
# up on the patch itself.
if ($base =~ /^$known_shells_regex$/) {
if (-x $interpreter
and ! script_is_evil_and_wrong($path)
and $filename !~ m,\.dpatch$,
and $filename !~ m,\.erb$,
# exclude some shells. zsh -n is broken, see #485885
and $base !~ m/^(z|t?c)sh$/) {
if (check_script_syntax($interpreter, $path)) {
script_tag('shell-script-fails-syntax-check', $filename);
}
}
}
# Try to find the expected path of the script to check. First check
# $INTERPRETERS and %versioned_interpreters. If not found there, see if
# it ends in a version number and the base is found in
# %versioned_interpreters.
my $data = $INTERPRETERS->value ($base);
my $versioned = 0;
if (not defined $data) {
$data = $VERSIONED_INTERPRETERS->value ($base);
undef $data if ($data and not defined ($data->[1]));
if (not defined ($data) and $base =~ /^(.*[^\d.-])-?[\d.]+$/) {
$data = $VERSIONED_INTERPRETERS->value ($1);
undef $data unless ($data and $base =~ /$data->[2]/);
}
$versioned = 1 if $data;
}
if ($data) {
my $expected = $data->[0] . '/' . $base;
unless ($interpreter eq $expected or defined $calls_env) {
script_tag('wrong-path-for-interpreter', $filename,
"(#!$interpreter != $expected)");
}
} elsif ($interpreter =~ m,/usr/local/,) {
script_tag('interpreter-in-usr-local', $filename, "#!$interpreter");
} elsif ($executable{'.' . $interpreter}) {
# Package installs the interpreter itself, so it's probably ok. Don't
# emit any tag for this.
} elsif ($interpreter eq '/bin/env') {
script_tag('script-uses-bin-env', $filename);
} else {
my $pinter = 0;
if ($interpreter =~ m,^/,) {
# Check if the package ships the interpreter (and it is
# executable).
my $interfile = substr $interpreter, 1;
my $index_info = $info->index->{$interfile};
$pinter = 1 if $index_info && ($index_info->operm & 0111);
}
script_tag('unusual-interpreter', $filename, "#!$interpreter")
unless $pinter;
}
# Check for obsolete perl libraries
if ($base eq 'perl' &&
!$str_deps->implies ('libperl4-corelibs-perl | perl (<< 5.12.3-7)')) {
open(FH, '<', $path) or fail("could not open script $path");
while (<FH>) {
if (/(?:do|require)\s+(?:'|")(abbrev|assert|bigfloat|bigint|bigrat|cacheout|complete|ctime|dotsh|exceptions|fastcwd|find|finddepth|flush|getcwd|getopt|getopts|hostname|importenv|look|newgetopt|open2|open3|pwd|shellwords|stat|syslog|tainted|termcap|timelocal|validate)\.pl(?:'|")/) {
tag 'script-uses-perl4-libs-without-dep', "$filename:$. ${1}.pl";
}
}
close(FH);
}
# If we found the interpreter and the script is executable, check
# dependencies. This should be the last thing we do in the loop so that
# we can use next for an early exit and reduce the nesting.
next unless ($data && $executable{$filename} and !$in_docs);
if (!$versioned) {
my $depends = $data->[1];
if (not defined $depends) {
$depends = $base;
}
if ($depends && !$all_parsed->implies($depends)) {
if ($base =~ /^(python|ruby|(m|g)awk)$/) {
tag("$base-script-but-no-$base-dep", $filename);
} elsif ($base eq 'csh' && $filename =~ m,^etc/csh/login\.d/,) {
# Initialization files for csh.
} elsif ($base eq 'fish' && $filename =~ m,^etc/fish\.d/,) {
# Initialization files for fish.
} elsif ($base eq 'ocamlrun' &&
$all_parsed->matches (qr/^ocaml(?:-base)?(?:-nox)?-\d\.[\d.]+/)) {
# ABI-versioned virtual packages for ocaml
} else {
tag 'missing-dep-for-interpreter', "$base => $depends",
"($filename)";
}
}
} elsif ($VERSIONED_INTERPRETERS->known ($base)) {
my @versions = @{ $data->[4] };
my @depends = map {
my $d = $data->[3];
$d =~ s/\$1/$_/g;
$d;
} @versions;
unshift (@depends, $data->[1]) if length $data->[1];
my $depends = join (' | ', @depends);
unless ($all_parsed->implies($depends)) {
if ($base eq 'php') {
tag 'php-script-but-no-phpX-cli-dep', $filename;
} elsif ($base =~ /^(wish|tclsh)/) {
tag "$1-script-but-no-$1-dep", $filename;
} else {
tag 'missing-dep-for-interpreter', "$base => $depends",
"($filename)";
}
}
} else {
my ($version) = ($base =~ /$data->[2]/);
my $depends = $data->[3];
$depends =~ s/\$1/$version/g;
unless ($all_parsed->implies($depends)) {
if ($base =~ /^php/) {
tag 'php-script-but-no-phpX-cli-dep', $filename;
} elsif ($base =~ /^(python|ruby)/) {
tag "$1-script-but-no-$1-dep", $filename;
} else {
tag 'missing-dep-for-interpreter', "$base => $depends",
"($filename)";
}
}
}
}
foreach (keys %executable) {
tag 'executable-not-elf-or-script', $_
unless ( $ELF{$_}
or $scripts{$_}
or $_ =~ m,^usr(?:/X11R6)?/man/,
or $_ =~ m/\.exe$/ # mono convention
);
}
open(SCRIPTS, '<', 'control-scripts')
or fail("cannot open lintian control-scripts file: $!");
# Handle control scripts. This is an edited version of the code for
# normal scripts above, because there were just enough differences to
# make a shared function awkward.
my %added_diversions;
my %removed_diversions;
my $expand_diversions = 0;
while (<SCRIPTS>) {
chop;
m/^(\S*) (.*)$/ or fail("bad line in control-scripts file: $_");
my $interpreter = $1;
my $file = $2;
my $filename = $info->control($file);
$interpreter =~ m|([^/]*)$|;
my $base = $1;
if ($interpreter eq '') {
tag 'script-without-interpreter', "control/$file";
next;
}
tag 'interpreter-not-absolute', "control/$file", "#!$interpreter"
unless ($interpreter =~ m|^/|);
if ($interpreter =~ m|/usr/local/|) {
tag 'control-interpreter-in-usr-local', "control/$file", "#!$interpreter";
} elsif ($base eq 'sh' or $base eq 'bash' or $base eq 'perl') {
my $expected = ($INTERPRETERS->value ($base))->[0] . '/' . $base;
tag 'wrong-path-for-interpreter', "#!$interpreter != $expected",
"(control/$file)"
unless ($interpreter eq $expected);
} elsif ($file eq 'config') {
tag 'forbidden-config-interpreter', "#!$interpreter";
} elsif ($file eq 'postrm') {
tag 'forbidden-postrm-interpreter', "#!$interpreter";
} elsif ($INTERPRETERS->known ($base)) {
my $data = $INTERPRETERS->value ($base);
my $expected = $data->[0] . '/' . $base;
unless ($interpreter eq $expected) {
tag 'wrong-path-for-interpreter', "#!$interpreter != $expected",
"(control/$file)"
}
tag 'unusual-control-interpreter', "control/$file", "#!$interpreter";
# Interpreters used by preinst scripts must be in Pre-Depends.
# Interpreters used by postinst or prerm scripts must be in Depends.
unless (not $data->[1]) {
my $depends = Lintian::Relation->new($data->[1]);
if ($file eq 'preinst') {
unless ($info->relation('pre-depends')->implies($depends)) {
tag 'preinst-interpreter-without-predepends',
"#!$interpreter"
}
} else {
unless ($info->relation('strong')->implies($depends)) {
tag 'control-interpreter-without-depends', "control/$file",
"#!$interpreter"
}
}
}
} else {
tag 'unknown-control-interpreter', "control/$file", "#!$interpreter";
next; # no use doing further checks if it's not a known interpreter
}
# perhaps we should warn about *csh even if they're somehow screwed,
# but that's not really important...
tag 'csh-considered-harmful', "control/$file"
if ($base eq 'csh' or $base eq 'tcsh');
my $shellscript = $base =~ /^$known_shells_regex$/ ? 1 : 0;
# Only syntax-check scripts we can check with bash.
my $checkbashisms;
if ($shellscript) {
$checkbashisms = $base eq 'sh' ? 1 : 0;
if ($base eq 'sh' or $base eq 'bash') {
if (check_script_syntax('/bin/bash', $filename)) {
tag 'maintainer-shell-script-fails-syntax-check', $file;
}
}
}
# now scan the file contents themselves
open (C, '<', $filename)
or fail("cannot open maintainer script $filename for reading: $!");
my %warned;
my ($saw_init, $saw_invoke, $saw_debconf, $saw_bange, $saw_sete, $has_code);
my $cat_string = '';
my $previous_line = '';
while (<C>) {
if ($. == 1 && $shellscript && m,/$base\s*.*\s-\w*e\w*\b,) {
$saw_bange = 1;
}
next if m,^\s*$,; # skip empty lines
next if m,^\s*\#,; # skip comment lines
$_ = remove_comments($_);
# Concatenate lines containing continuation character (\) at the end
if ($shellscript && /\\$/) {
s/\\//;
chomp;
$previous_line .= $_;
next;
}
chomp;
$_ = $previous_line . $_;
$previous_line = '';
# Don't consider the standard dh-make boilerplate to be code. This
# means ignoring the framework of a case statement, the labels, the
# echo complaining about unknown arguments, and an exit.
unless ($has_code
|| m/^\s*set\s+-\w+\s*$/
|| m/^\s*case\s+\"?\$1\"?\s+in\s*$/
|| m/^\s*(?:[a-z|-]+|\*)\)\s*$/
|| m/^\s*[:;]+\s*$/
|| m/^\s*echo\s+\"[^\"]+\"(?:\s*>&2)?\s*$/
|| m/^\s*esac\s*$/
|| m/^\s*exit\s+\d+\s*$/) {
$has_code = 1;
}
if ($shellscript && m,${LEADIN}set\s*(\s+-(-.*|[^e]+))*\s-\w*e,) {
$saw_sete = 1;
}
if (m,[^\w]((/var)?/tmp|\$TMPDIR)/[^)\]}\s], and not m/\bmks?temp\b/ and not m/\btempfile\b/ and not m/\bmkdir\b/ and not m/\$RANDOM/) {
tag 'possibly-insecure-handling-of-tmp-files-in-maintainer-script', "$file:$."
unless $warned{tmp};
$warned{tmp} = 1;
}
if (m/^\s*killall(?:\s|\z)/) {
tag 'killall-is-dangerous', "$file:$." unless $warned{killall};
$warned{killall} = 1;
}
if (m/^\s*mknod(?:\s|\z)/ and not m/\sp\s/) {
tag 'mknod-in-maintainer-script', "$file:$.";
}
# Collect information about init script invocations to catch running
# init scripts directly rather than through invoke-rc.d. Since the
# script is allowed to run the init script directly if invoke-rc.d
# doesn't exist, only tag direct invocations where invoke-rc.d is
# never used in the same script. Lots of false negatives, but
# hopefully not many false positives.
if (m%^\s*/etc/init\.d/(\S+)\s+[\"\']?(\S+)[\"\']?%) {
$saw_init = $.;
}
if (m%^\s*invoke-rc\.d\s+%) {
$saw_invoke = $.;
}
if ($shellscript) {
if ($cat_string ne '' and m/^\Q$cat_string\E$/) {
$cat_string = '';
}
my $within_another_shell = 0;
if (m,(?:^|\s+)(?:(?:/usr)?/bin/)?($known_shells_regex)\s+-c\s*.+,
and $1 ne 'sh') {
$within_another_shell = 1;
}
# if cat_string is set, we are in a HERE document and need not
# check for things
if ($cat_string eq '' and $checkbashisms and !$within_another_shell) {
my $found = 0;
my $match = '';
# since this test is ugly, I have to do it by itself
# detect source (.) trying to pass args to the command it runs
# The first expression weeds out '. "foo bar"'
if (not $found and
not m/^\s*\.\s+(\"[^\"]+\"|\'[^\']+\')\s*(\&|\||\d?>|<|;|\Z)/
and m/^\s*(\.\s+[^\s;\`:]+\s+([^\s;]+))/) {
my $extra;
($match, $extra) = ($1, $2);
if ($extra =~ /^(\&|\||\d?>|<)/) {
# everything is ok
;
} else {
$found = 1;
}
}
my $line = $_;
unless ($found) {
for my $re (@bashism_single_quote_regexs) {
if ($line =~ m/($re)/) {
$found = 1;
($match) = m/($re)/;
last;
}
}
}
# Ignore anything inside single quotes; it could be an
# argument to grep or the like.
# $cat_line contains the version of the line we'll check
# for heredoc delimiters later. Initially, remove any
# spaces between << and the delimiter to make the following
# updates to $cat_line easier.
my $cat_line = $line;
$cat_line =~ s/(<\<-?)\s+/$1/g;
# Remove single quoted strings, with the exception that we
# don't remove the string
# if the quote is immediately preceeded by a < or a -, so we
# can match "foo <<-?'xyz'" as a heredoc later
# The check is a little more greedy than we'd like, but the
# heredoc test itself will weed out any false positives
$cat_line =~ s/(^|[^<\\\"-](?:\\\\)*)\'(?:\\.|[^\\\'])+\'/$1''/g;
unless ($found) {
# Remove "quoted quotes". They're likely to be inside
# another pair of quotes; we're not interested in
# them for their own sake and removing them makes finding
# the limits of the outer pair far easier.
$line =~ s/(^|[^\\\'\"])\"\'\"/$1/g;
$line =~ s/(^|[^\\\'\"])\'\"\'/$1/g;
$line =~ s/(^|[^\\\"](?:\\\\)*)\'(?:\\.|[^\\\'])+\'/$1''/g;
for my $re (@bashism_string_regexs) {
if ($line =~ m/($re)/) {
$found = 1;
($match) = m/($re)/;
last;
}
}
}
# We've checked for all the things we still want to notice in
# double-quoted strings, so now remove those strings as well.
$cat_line =~ s/(^|[^<\\\'-](?:\\\\)*)\"(?:\\.|[^\\\"])+\"/$1""/g;
unless ($found) {
$line =~ s/(^|[^\\\'](?:\\\\)*)\"(?:\\.|[^\\\"])+\"/$1""/g;
for my $re (@bashism_regexs) {
if ($line =~ m/($re)/) {
$found = 1;
($match) = m/($re)/;
last;
}
}
}
if ($found) {
tag 'possible-bashism-in-maintainer-script', "$file:$. \'$match\'";
}
# Only look for the beginning of a heredoc here, after we've
# stripped out quoted material, to avoid false positives.
if ($cat_line =~ m/(?:^|[^<])\<\<\-?\s*(?:[\\]?(\w+)|[\'\"](.*?)[\'\"])/) {
$cat_string = $1;
$cat_string = $2 if not defined $cat_string;
}
}
if (!$cat_string) {
if (/^\s*start-stop-daemon\s+/ && !/\s--stop\b/) {
tag 'start-stop-daemon-in-maintainer-script', "$file:$.";
}
# Don't use chown foo.bar
if (/(chown(\s+--?[A-Za-z-]+)*\s+[-_A-Za-z0-9]+\.[-_A-Za-z0-9]+)\s+/) {
tag 'deprecated-chown-usage', "$file:$. \'$1\'";
}
if (/invoke-rc.d.*\|\| exit 0/) {
tag 'maintainer-script-hides-init-failure', "$file:$.";
}
if (m,/usr/share/debconf/confmodule,) {
$saw_debconf = 1;
}
if (m/^\s*read(?:\s|\z)/ && !$saw_debconf) {
tag 'read-in-maintainer-script', "$file:$.";
}
if (m,^\s*rm\s+(?:[^>]*\s)?/dev/([^/ ]+),) {
my $f = $1//'';
if ($f ne 'shm' && $f !~ m,^\.[^.]+,) {
# Ignore /dev/shm (initscripts) and dot-files (which are probably
# not a dev).
tag 'maintainer-script-removes-device-files', "$file:$.";
}
}
if (m,>\s*(/etc/(?:services|protocols|rpc))(\s|\Z),) {
tag 'maintainer-script-modifies-netbase-managed-file', "$file:$. $1";
}
if (m,^\s*(?:cp|mv)\s.*(/etc/(?:services|protocols|rpc))\s*$,) {
tag 'maintainer-script-modifies-netbase-managed-file', "$file:$. $1";
}
if (m,>\s*/etc/inetd\.conf(\s|\Z),) {
tag 'maintainer-script-modifies-inetd-conf', "$file:$."
unless $info->relation('provides')->implies('inet-superserver');
}
if (m,^\s*(?:cp|mv)\s+(?:.*\s)?/etc/inetd\.conf\s*$,) {
tag 'maintainer-script-modifies-inetd-conf', "$file:$."
unless $info->relation('provides')->implies('inet-superserver');
}
if (m,>\s*/etc/ld\.so\.conf(\s|\Z),) {
tag 'maintainer-script-modifies-ld-so-conf', "$file:$."
unless $pkg =~ /^libc/;
}
if (m,^\s*(?:cp|mv)\s+(?:.*\s)?/etc/ld\.so\.conf\s*$,) {
tag 'maintainer-script-modifies-ld-so-conf', "$file:$."
unless $pkg =~ /^libc/;
}
# Ancient dpkg feature tests.
if (m/${LEADIN}dpkg\s+--assert-working-epoch\b/) {
tag 'ancient-dpkg-epoch-check', "$file:$.";
}
if (m/${LEADIN}dpkg\s+--assert-multi-conrep\b/) {
tag 'ancient-dpkg-multi-conrep-check', "$file:$.";
}
# Commands that should not be used in maintainer scripts.
if (m,${LEADIN}(?:/usr/bin/)?fc-cache(\s|\Z),) {
tag 'fc-cache-used-in-maintainer-script', "$file:$.";
}
# Check for running commands with a leading path.
#
# Unfortunately, our $LEADIN string doesn't work well for this
# in the presence of commands that contain backquoted
# expressions because it can't tell the difference between the
# initial backtick and the closing backtick. We therefore
# first extract all backquoted expressions and check them
# separately, and then remove them from a copy of a string and
# then check it for bashisms.
while (m,\`([^\`]+)\`,g) {
my $cmd = $1;
if ($cmd =~ m,$LEADIN(/(usr/)?s?bin/[\w.+-]+)(\s|;|\z),) {
tag 'command-with-path-in-maintainer-script',
"$file:$. $1";
}
}
my $cmd = $_;
$cmd =~ s/\`[^\`]+\`//g;
if ($cmd =~ m,$LEADIN(/(?:usr/)?s?bin/[\w.+-]+)(?:\s|;|$),) {
tag 'command-with-path-in-maintainer-script', "$file:$. $1";
}
}
}
if (m,\bsuidregister\b,) {
tag 'suidregister-used-in-maintainer-script', $file;
}
if ($file eq 'preinst') {
if (m/^\s*dpkg-maintscript-helper(?:\s|\z)/ &&
!$info->relation('pre-depends')->implies('dpkg (>= 1.15.7.2~)')) {
tag 'preinst-uses-dpkg-maintscript-helper-without-predepends', "$file:$.";
}
}
if ($file eq 'postrm') {
if (m,update\-alternatives \-\-remove,) {
tag 'update-alternatives-remove-called-in-postrm';
}
} else {
for my $rule (@depends_needed) {
my ($package, $regex) = @$rule;
if ($pkg ne $package and /$regex/ and ! $warned{$package}) {
if (m,-x\s+\S*$regex, or m,(which|type)\s+$regex, or m,command\s+.*?$regex,) {
$warned{$package} = 1;
} elsif (!/\|\|\s*true\b/) {
unless ($info->relation('strong')->implies($package)) {
my $shortpackage = $package;
$shortpackage =~ s/[ \(].*//;
tag "maintainer-script-needs-depends-on-$shortpackage", $file;
$warned{$package} = 1;
}
}
}
}
}
if (m,\bgconftool(-2)?(\s|\Z),) {
tag 'gconftool-used-in-maintainer-script', "$file:$.";
}
if (m,\binstall-sgmlcatalog\b, && !(m,--remove, && ($file eq 'prerm' || $file eq 'postinst'))) {
tag 'install-sgmlcatalog-deprecated', "$file:$.";
}
if (m,\binstall-info\b,) {
tag 'install-info-used-in-maintainer-script', "$file:$.";
}
if (m,/var/lib/dpkg/status\b, && $pkg ne 'base-files' && $pkg ne 'dpkg') {
tag 'maintainer-script-uses-dpkg-status-directly', $file;
}
if (m,$LEADIN(?:/usr/sbin/)?dpkg-divert\s, && ! /--(?:help|list|truename|version)/) {
if (/--local/ or !/--package/) {
tag 'package-uses-local-diversion', "$file:$.";
}
my $mode = /--remove/ ? 'remove' : 'add';
my ($divert) = /dpkg-divert\s*(.*)$/;
$divert =~ s/\s*(?:\${?[\w:=-]+}?)*\s*--(?:add|quiet|remove|rename|test|local|(:?admindir|divert|package)\s+\S+)\s*//g;
# Remove unpaired opening or closing parenthesis
1 while($divert =~ m/\G.*?\(.+?\)/gc);
$divert =~ s/\G(.*?)[()]/$1/;
pos($divert) = undef;
# Remove unpaired opening or closing braces
1 while($divert =~ m/\G.*?{.+?}/gc);
$divert =~ s/\G(.*?)[{}]/$1/;
pos($divert) = undef;
# position after the last pair of quotation marks, if any
1 while($divert =~ m/\G.*?(\"|\').+?\1/gc);
# Strip anything matching and after '&&', '||', ';', or '>'
# this is safe only after we are positioned after the last pair
# of quotation marks
$divert =~ s/\G.+?\K(?: && | \|\| | ; | \d*> ).*$//x;
pos($divert) = undef;
# Remove quotation marks, they affect:
# * our var to regex trick
# * stripping the initial slash if the path was quoted
$divert =~ s/[\"\']//g;
# remove the leading / because it's not in the index hash
$divert =~ s,^/,,;
# remove any remaining leading or trailing whitespace.
$divert =~ s/^\s+//;
$divert =~ s/\s+$//;
$divert = quotemeta($divert);
# For now just replace variables, they will later be normalised
$expand_diversions = 1 if $divert =~ s/\\\$\w+/.+/g;
$expand_diversions = 1 if $divert =~ s/\\\$\\{\w+.*?\\}/.+/g;
# handle $() the same way:
$expand_diversions = 1 if $divert =~ s/\\\$\\\(.+?\\\)/.+/g;
if ($mode eq 'add') {
$added_diversions{$divert} = {'script' => $file, 'line' => $.};
} elsif ($mode eq 'remove') {
push @{$removed_diversions{$divert}}, {'script' => $file, 'line' => $.};
} else {
fail "Internal error: \$mode has unknown value: $mode";
}
}
}
if ($saw_init && ! $saw_invoke) {
tag 'maintainer-script-calls-init-script-directly', "$file:$saw_init";
}
unless ($has_code) {
tag 'maintainer-script-empty', $file;
}
if ($shellscript && !$saw_sete) {
if ($saw_bange) {
tag 'maintainer-script-without-set-e', $file;
} else {
tag 'maintainer-script-ignores-errors', $file;
}
}
close C;
}
close(SCRIPTS);
# If any of the maintainer scripts used a variable in the file or
# diversion name normalise them all
if ($expand_diversions) {
for my $divert (keys %removed_diversions, keys %added_diversions) {
# if a wider regex was found, the entries might no longer be there
unless (exists($removed_diversions{$divert})
or exists($added_diversions{$divert})) {
next;
}
my $widerrx = $divert;
my $wider = $widerrx;
$wider =~ s/\\//g;
# find the widest regex:
my @matches = grep {
my $lrx = $_;
my $l = $lrx;
$l =~ s/\\//g;
if ($wider =~ m/^$lrx$/) {
$widerrx = $lrx;
$wider = $l;
1;
} elsif ($l =~ m/^$widerrx$/) {
1;
} else {
0;
}
} (keys %removed_diversions, keys %added_diversions);
# replace all the occurences with the widest regex:
for my $k (@matches) {
next if ($k eq $widerrx);
if (exists($removed_diversions{$k})) {
$removed_diversions{$widerrx} = $removed_diversions{$k};
delete $removed_diversions{$k};
}
if (exists($added_diversions{$k})) {
$added_diversions{$widerrx} = $added_diversions{$k};
delete $added_diversions{$k};
}
}
}
}
for my $divert (keys %removed_diversions) {
if (exists $added_diversions{$divert}) {
# just mark the entry, because a --remove might
# happen in two branches in the script, i.e. we
# see it twice, which is not a bug
$added_diversions{$divert}{'removed'} = 1;
} else {
for my $item (@{$removed_diversions{$divert}}) {
my $script = $item->{'script'};
my $line = $item->{'line'};
next unless ($script eq 'postrm');
# Allow preinst and postinst to remove diversions the
# package doesn't add to clean up after previous
# versions of the package.
$divert = unquote($divert, $expand_diversions);
tag 'remove-of-unknown-diversion', $divert, "$script:$line";
}
}
}
for my $divert (keys %added_diversions) {
my $script = $added_diversions{$divert}{'script'};
my $line = $added_diversions{$divert}{'line'};
my $divertrx = $divert;
$divert = unquote($divert, $expand_diversions);
if (not exists $added_diversions{$divertrx}{'removed'}) {
tag 'orphaned-diversion', $divert, $script;
}
# Handle man page diversions somewhat specially. We may divert away a man
# page in one section without replacing that same file, since we're
# installing a man page in a different section. An example is diverting a
# man page in section 1 and replacing it with one in section 1p (such as
# libmodule-corelist-perl at the time of this writing).
#
# Deal with this by turning all man page diversions into wildcard
# expressions instead that match everything in the same numeric section so
# that they'll match the files shipped in the package.
if ($divertrx =~ m,^(usr\\/share\\/man\\/\S+\\/.*\\\.\d)\w*(\\\.gz\z),) {
$divertrx = "$1.*$2";
$expand_diversions = 1;
}
if ($expand_diversions) {
tag 'diversion-for-unknown-file', $divert, "$script:$line"
unless (grep { $_ =~ m/$divertrx/ } $info->sorted_index);
} else {
tag 'diversion-for-unknown-file', $divert, "$script:$line"
unless (exists $info->index->{$divert});
}
}
}
# -----------------------------------
# Returns non-zero if the given file is not actually a shell script,
# just looks like one.
sub script_is_evil_and_wrong {
my ($filename) = @_;
my $ret = 0;
open (IN, '<', $filename) or fail("cannot open $filename: $!");
my $i = 0;
my $var = '0';
my $backgrounded = 0;
local $_;
while (<IN>) {
chomp;
next if m/^#/o;
next if m/^$/o;
last if (++$i > 55);
if (m~
# the exec should either be "eval"ed or a new statement
(^\s*|\beval\s*[\'\"]|(;|&&|\b(then|else))\s*)
# eat anything between the exec and $0
exec\s*.+\s*
# optionally quoted executable name (via $0)
.?\$$var.?\s*
# optional "end of options" indicator
(--\s*)?
# Match expressions of the form '${1+$@}', '${1:+"$@"',
# '"${1+$@', "$@", etc where the quotes (before the dollar
# sign(s)) are optional and the second (or only if the $1
# clause is omitted) parameter may be $@ or $*.
#
# Finally the whole subexpression may be omitted for scripts
# which do not pass on their parameters (i.e. after re-execing
# they take their parameters (and potentially data) from stdin
.?(\${1:?\+.?)?(\$(\@|\*))?~x) {
$ret = 1;
last;
} elsif (/^\s*(\w+)=\$0;/) {
$var = $1;
} elsif (m~
# Match scripts which use "foo $0 $@ &\nexec true\n"
# Program name
\S+\s+
# As above
.?\$$var.?\s*
(--\s*)?
.?(\${1:?\+.?)?(\$(\@|\*))?.?\s*\&~x) {
$backgrounded = 1;
} elsif ($backgrounded and m~
# the exec should either be "eval"ed or a new statement
(^\s*|\beval\s*[\'\"]|(;|&&|\b(then|else))\s*)
exec\s+true(\s|\Z)~x) {
$ret = 1;
last;
}
}
close IN;
return $ret;
}
# Given an interpretor and a file, run the interpretor on that file with the
# -n option to check syntax, discarding output and returning the exit status.
sub check_script_syntax {
my ($interpreter, $script) = @_;
my $pid = fork;
if (!defined $pid) {
fail("cannot fork: $!");
} elsif ($pid == 0) {
open STDOUT, '>', '/dev/null' or fail("cannot reopen stdout: $!");
open STDERR, '>&STDOUT' or fail("cannot reopen stderr: $!");
exec $interpreter, '-n', $script
or fail("cannot exec $interpreter: $!");
} else {
waitpid $pid, 0;
}
return $?;
}
sub remove_comments {
local $_;
my $line = shift || '';
$_ = $line;
# Remove quoted strings so we can more easily ignore comments
# inside them
s/(^|[^\\](?:\\\\)*)\'(?:\\.|[^\\\'])+\'/$1''/g;
s/(^|[^\\](?:\\\\)*)\"(?:\\.|[^\\\"])+\"/$1""/g;
# If the remaining string contains what looks like a comment,
# eat it. In either case, swap the unmodified script line
# back in for processing (if required) and return it.
if (m/(?:^|[^[\\])[\s\&;\(\)](\#.*$)/) {
$_ = $line;
s/\Q$1\E//; # eat comments
} else {
$_ = $line;
}
return $_;
}
sub unquote($$) {
my ($string, $replace_regex) = @_;
$string =~ s,\\,,g;
if ($replace_regex) {
$string =~ s,\.\+,*,g;
}
return $string;
}
sub _parse_interpreters {
my ($interpreter, $value) = @_;
my ($path, $dep) = split m/\s*,\s*/, $value, 2;
$dep = $interpreter if not $dep;
if ($dep eq '@NODEPS@') {
$dep = '';
} elsif ($dep =~ m/@/) {
fail "Unknown magic value $dep for versioned interpreter $interpreter";
}
return [$path, $dep];
}
sub _parse_versioned_interpreters {
my ($interpreter, $value) = @_;
my ($path, $regex, $deptmp, $vers, $deprel) = split m/\s*,\s*/, $value, 5;
my @versions = split m/\s++/, $vers;
$deprel = $interpreter if not $deprel;
if ($deprel eq '@NO_DEFAULT_DEPS@') {
$deprel = '';
} elsif ($deprel eq '@SKIP_UNVERSIONED@') {
$deprel = undef;
} elsif ($deprel =~ m/@/) {
fail "Unknown magic value $deprel for versioned interpreter $interpreter";
}
return [$path, $deprel, qr/^$regex$/, $deptmp, \@versions];
}
1;
# Local Variables:
# indent-tabs-mode: nil
# cperl-indent-level: 4
# End:
# vim: syntax=perl sw=4 sts=4 sr et
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