On Thu, May 30, 2024 at 08:35:47AM +0200, Johannes Schauer Marin Rodrigues wrote: > Hi, > > Quoting Luca Boccassi (2024-05-28 01:54:08) > > Thanks for the useful input, the following has been done: > > > > - existing installations pre-trixie will get an orphaned tmpfiles.d in > > /etc/ that keeps the existing behaviour unchanged (no cleanup of > > /var/tmp) > > - openssh and tmux have been fixed to provide a tmpfiles.d exception > > to retain their respective files > > - the /tmp/ description in debian-installer has been updated to note > > it is a tmpfs by default (via a commit in partman-basicfilesystems, > > will upload if nobody gets around to it before Trixie's freeze) > > - two paragraphs have been provided for the release notes ticket > > - the changes are also noted in NEWS, with instructions on how to > > override locally > > - as mentioned, the latest upload to unstable makes /tmp/ a tmpfs by > > default and for new installations 10+ days old files in /tmp/ and 30+ days > > old files in /var/tmp/ are cleaned up daily > > thank you for having discussed this change on d-devel and for adding > documentation to NEWS and release notes to announce this change. I also think > it is sensible to roll this only out on new installations and to keep the > behaviour on existing setups. Thank you for implementing that as well. > > That being said, maybe some Perl wizard knows how to do a flock on a directory > in Perl?
I wouldn't call myself a Perl wizard by a long stretch, but I can give it a try
:)
> I tried this:
>
> use Fcntl qw(LOCK_EX);
> opendir(my $handle, ".") or die "opendir: $!";
[snip]
Here lies your problem. The flock(2) syscall works on file descriptors,
the things returned by open(2), not on the dirent structures returned by
opendir(3). So you need something like this:
use v5.10; # I really should switch to at least 5.16 if not 5.24
use strict;
use warnings;
use Fcntl qw(O_RDONLY O_DIRECTORY LOCK_EX);
my $dirname = "/tmp/to-be-locked";
sysopen(my $handle, "/tmp/to-be-locked", O_RDONLY | O_DIRECTORY) or
die "Could not open $dirname: $!\n";
flock($handle, LOCK_EX) or
die "Could not lock $dirname: $!\n";
say "locked, it seems";
sleep(3600);'
I only put the sleep() part so I could check using lsof that
the directory was indeed locked. And yeah, the v5.10 part is a leftover
from the days (...until a month or two ago...) when I still had to
support stock CentOS 7 systems; I really should train my fingers to
put 5.24 there.
Hope that helps!
G'luck,
Peter
--
Peter Pentchev r...@ringlet.net r...@debian.org pe...@morpheusly.com
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