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#!/usr/bin/perl
#
# Copyright © 2005 Martin Pitt <mpitt@debian.org>
# Copyright © 2019-2025 Guillem Jover <guillem@debian.org>
#
# 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, see <https://www.gnu.org/licenses/>.
use strict;
use warnings;
use Scalar::Util qw(looks_like_number);
my $PROG = 'update-sysfs';
my $CONFFILE = '/etc/sysfs.conf';
my $CONFDIR = '/etc/sysfs.d';
sub error
{
print { \*STDERR } "$PROG: error: @_\n";
exit 1;
}
sub warning
{
print { \*STDERR } "$PROG: warning: @_\n";
return;
}
sub set_attr
{
my ($path, $value) = @_;
open my $fh, '>', $path
or return 0;
# Some fields need a terminating newline, others need the terminating
# newline to be absent. :-(
printf { $fh } '%s', $value
or printf { $fh } "%s\n", $value
or return 0;
close $fh;
return 1;
}
sub load_config
{
my $file = shift;
open my $fh, '<', $file
or error "cannot open file $file: $!";
while (<$fh>) {
# Remove comments.
s{#.*$}{};
# Remove spaces.
s{^\s*}{};
s{\s*$}{};
next unless length;
if (m{^(.+)\s*=\s*(.+)$}) {
my $action = 'set';
my $attr = $1;
my $value = $2;
if ($attr =~ s{^mode\s*}{}) {
$action = 'chmod';
} elsif ($attr =~ s{^owner\s*}{}) {
$action = 'chown';
}
foreach my $path (glob "/sys/$attr") {
if (($action eq 'set' && ! -f $path) ||
(! -f $path && ! -d $path)) {
warning("unknown attribute $path, in $file at line $.");
next;
}
if ($action eq 'set' && ! set_attr($path, $value)) {
warning("cannot write value '$value' for attribute $path, in $file at line $.: $!");
} elsif ($action eq 'chmod') {
my $mode = $value;
if (looks_like_number($mode)) {
chmod oct($mode), $path
or warning("cannot set permission '$mode' for attribute $path, in $file at line $.: $!");
} else {
warning("use of symbolic modes (like '$mode') are deprecated, use an octal mode instead, in $file at line $.");
system('chmod', $mode, $path) == 0
or warning("cannot set permission '$mode' for attribute $path, in $file at line $. (via external chmod): $?");
}
} elsif ($action eq 'chown') {
my ($user, $group) = split /:/, $value;
my ($uid, $gid) = (-1, -1);
$uid = looks_like_number($user) ? $user : (getpwnam $user) // -1;
if ($uid < 0) {
warning("user name '$user' does not exist, ignoring user, in $file at line $.");
}
if (defined $group) {
$gid = looks_like_number($group) ? $group : (getgrnam $group) // -1;
if ($gid < 0) {
warning("group name '$group' does not exist, ignoring group, in $file at line $.");
}
}
chown $uid, $gid, $path
or warning("cannot set ownership '$value' for attribute $path, in $file at line $.: $!");
}
}
} else {
error("syntax error in $file, line $.: $_");
}
}
close $fh;
}
if (! -r $CONFFILE && ! -d $CONFDIR) {
exit 0;
}
foreach my $file (($CONFFILE, glob "$CONFDIR/*.conf")) {
next unless -r $file;
load_config($file);
}
1;
|
