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#!perl
use 5.010_001;
use strict;
use warnings;
use utf8;
use Const::Fast;
use File::stat;
use Linux::Inotify2;
our $VERSION = '0.03';
const our $SELF => 'inotifymask';
# Mask to remove the bits of stat->mode that we don't care about
const our $STAT_MASK => oct '07777';
# Check argument count
if ( @ARGV < 2 ) {
printf {*STDERR} "%s: Need a mask and at least one file\n", $SELF;
exit 2;
}
# Shift off mask as octal, remaining arguments are files
my $mask = oct shift;
my @files = @ARGV;
# Process creation and move-in events
my $cb = sub {
my ($event) = @_;
my $name = $event->fullname;
# File must exist
-e $name
or return;
# Must not be a directory
not -d $name
or return;
# Get stats or give up
my $stat = stat $name
or return;
# Get the mode we want for the file, masking off irrelevant file type bits
my $mode = $stat->mode & $STAT_MASK;
# Check that at least one bit of the mask coincides with one bit of the
# present mode, i.e. that we'll be changing anything
$mode & $mask
or return;
# Using the masked mode, change the permissions and log to stderr
for ( $mode & ~$mask ) {
chmod $_, $name
or return;
printf {*STDERR} "secured %s %o\n", $name, $_;
}
};
# Create object and set up watches with callback, start polling
my $in = Linux::Inotify2->new;
for (@files) {
$in->watch( $_, IN_CREATE | IN_MOVED_TO, $cb );
}
while (1) {
$in->poll;
}
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