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marsadm: safeguard versionlink deletion

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Thomas Schoebel-Theuer 2022-03-23 07:59:39 +01:00 committed by Thomas Schoebel-Theuer
parent 5994726b1a
commit 70880946ca
1 changed files with 19 additions and 0 deletions
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19
userspace/marsadm
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@ -6310,6 +6310,9 @@ sub logdelete_res {
_create_delete($path);
}
next;
} elsif (is_recent($stamp)) {
lwarn "Another join-resource detected at '$path'\n";
$transient_join = 1;
}
next if is_member($res, $host);
next unless is_guest($res, $host);
@ -6337,12 +6340,28 @@ sub logdelete_res {
lwarn "Keeping some versionlinks\n";
return unless $force;
}
# Well, be careful due to Distributed Races(tm)
lprint "Removing left-over versionlinks...\n" if $verbose;
foreach my $versionlink (@versionlinks) {
my $nrv = $versionlink;
$nrv =~ s/^.*\/version-([0-9]+)-.+$/$1/;
# we need at least one more version link than logfiles for consistency checks
next unless $nrv < $max_deletable - 1;
# Further safeguard: do not delete newer versionlinks.
# These will feed out over time.
my $max_age = get_link_stamp($versionlink);
my $sibl_glob = $versionlink;
$sibl_glob =~ s:(/version-[0-9]+).*:$1:;
my @siblings = lamport_glob("${sibl_glob}-*");
for my $sibling (@siblings) {
next if $sibling eq $versionlink;
my $sibl_age = get_link_stamp($versionlink);
$max_age = $sibl_age if $sibl_age > $max_age;
}
my $recent = is_recent($max_age);
if (!$recent) {
last;
}
_create_delete($versionlink);
}