Thanks for the suggestions, the problem is that when you get the event that the file has moved the copy does not yet exist (preventing a new watch), so you need to watch the directory as well...
Here what seems to work for me, any improvements welcome:
use strict;
use Linux::Inotify2;
use File::Basename qw(dirname);
use File::Spec;
$|++;
my ($file_to_watch)=@ARGV;
my $notify = Linux::Inotify2->new or die $!;
&setup_watch;
sub setup_watch {
$notify->watch ($file_to_watch, IN_MODIFY | IN_MOVE_SELF, \&watch_fi
+le) or die $!;
}
sub watch_file {
my($e)=@_;
my $fn = $e->fullname;
if($e->IN_MODIFY) {
print "$fn changed\n";
}
if($e->IN_MOVE_SELF) {
print "old $fn moved\n";
$e->w->cancel;
my $dir = dirname $fn;
$notify->watch ($dir, IN_CREATE, \&watch_dir) or die $!;
}
}
sub watch_dir {
my($e)=@_;
my $fn = File::Spec->canonpath($e->fullname);
return unless $fn eq $file_to_watch;
$e->w->cancel;
print "$fn newly created (probably changed)\n";
setup_watch;
}
while(1) {
my $n = $notify->poll;
print "handled $n events\n\n";
}