* [PATCH] xapcmd: localize %SIG changes using "local"
@ 2019-11-13 7:57 Eric Wong
0 siblings, 0 replies; only message in thread
From: Eric Wong @ 2019-11-13 7:57 UTC (permalink / raw)
To: meta
Perl's "local" allows changes to %SIG (and %ENV) to be limited
to its enclosing block. This allows us to get rid of a global
variable and ad-hoc method for restoring signal handlers.
---
lib/PublicInbox/Xapcmd.pm | 31 ++++++++++++-------------------
1 file changed, 12 insertions(+), 19 deletions(-)
diff --git a/lib/PublicInbox/Xapcmd.pm b/lib/PublicInbox/Xapcmd.pm
index 22e56f42..95d472b0 100644
--- a/lib/PublicInbox/Xapcmd.pm
+++ b/lib/PublicInbox/Xapcmd.pm
@@ -26,6 +26,7 @@ sub commit_changes ($$$) {
my @old_shard;
while (my ($old, $new) = each %$tmp) {
+ next if $old eq ''; # no invalid paths
my @st = stat($old);
if (!@st && !defined($opt->{reshard})) {
die "failed to stat($old): $!";
@@ -59,7 +60,7 @@ sub commit_changes ($$$) {
}
}
remove_tree(@old_shard);
- $tmp->done;
+ $tmp = undef;
if (!$opt->{-coarse_lock}) {
$opt->{-skip_lock} = 1;
@@ -176,6 +177,9 @@ sub run {
die "--reshard must be a positive number\n";
}
+ local %SIG = %SIG;
+ $tmp->setup_signals;
+
# we want temporary directories to be as deep as possible,
# so v2 shards can keep "xap$SCHEMA_VERSION" on a separate FS.
if ($v == 1) {
@@ -373,11 +377,13 @@ sub cpdb ($$) {
}
my ($xtmp, $tmp);
+ local %SIG = %SIG;
if ($opt->{compact}) {
my $newdir = dirname($new);
same_fs_or_die($newdir, $new);
$tmp = tempdir("$new.compact-XXXXXX", DIR => $newdir);
$xtmp = PublicInbox::Xtmpdirs->new;
+ $xtmp->setup_signals;
$xtmp->{$new} = $tmp;
} else {
$tmp = $new;
@@ -445,7 +451,7 @@ sub cpdb ($$) {
# since $dst isn't readable by HTTP or NNTP clients, yet:
compact([ $tmp, $new ], $opt);
remove_tree($tmp) or die "failed to remove $tmp: $!\n";
- $xtmp->done;
+ $xtmp = undef;
}
# slightly easier-to-manage manage than END{} blocks
@@ -453,38 +459,25 @@ package PublicInbox::Xtmpdirs;
use strict;
use warnings;
use File::Path qw(remove_tree);
-my %owner;
-sub new {
+sub setup_signals () {
# http://www.tldp.org/LDP/abs/html/exitcodes.html
$SIG{INT} = sub { exit(130) };
$SIG{HUP} = $SIG{PIPE} = $SIG{TERM} = sub { exit(1) };
- my $self = bless {}, $_[0]; # old shard => new (WIP) shard
- $owner{"$self"} = $$;
- $self;
}
-sub done {
- my ($self) = @_;
- delete $owner{"$self"};
-
- my %known_pids;
- $known_pids{$_}++ foreach values %owner;
- if (!$known_pids{$$}) {
- $SIG{INT} = $SIG{HUP} = $SIG{PIPE} = $SIG{TERM} = 'DEFAULT';
- }
- %$self = ();
+sub new {
+ bless { '' => $$ }, $_[0]; # old shard => new (WIP) shard
}
sub DESTROY {
my ($self) = @_;
- my $owner_pid = delete $owner{"$self"} or return;
+ my $owner_pid = delete($self->{''}) or return;
return if $owner_pid != $$;
foreach my $new (values %$self) {
defined $new or next; # may be undef if resharding
remove_tree($new) unless -d "$new/old";
}
- done($self);
}
1;
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2019-11-13 7:57 [PATCH] xapcmd: localize %SIG changes using "local" Eric Wong
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