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add a new pipe to communicate the number of blocks to the parent instead of abusing the hookhelper/listener

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Johannes 'josch' Schauer 2020-08-18 12:08:55 +02:00
parent a5ea38cbad
commit df18304449
Signed by untrusted user: josch
GPG key ID: F2CBA5C78FBD83E1
1 changed files with 30 additions and 38 deletions
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mmdebstrap
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@ -3257,24 +3257,6 @@ sub hooklistener {
if ($? != 0) {
error "tar failed";
}
} elsif ($msg eq "nblks") {
# handle the nblks message
my $numblocks;
debug "received message: nblks";
{
my $ret = read(STDIN, $numblocks, $len)
// error "cannot read from socket: $!";
if ($ret == 0) {
error "received eof on socket";
}
}
if ($numblocks !~ /^\d+$/) {
error "invalid number of blocks: $numblocks";
}
debug "sending okthx";
print STDOUT (pack("n", 0) . "okthx")
or error "cannot write to socket: $!";
STDOUT->flush();
} else {
error "unknown message: $msg";
}
@ -4566,7 +4548,6 @@ sub main() {
error "unknown format: $format";
}
my $numblocks = 0;
my $exitstatus = 0;
my @taropts = (
'--sort=name',
@ -4602,6 +4583,13 @@ sub main() {
socketpair my $childsock, my $parentsock, AF_UNIX, SOCK_STREAM, PF_UNSPEC
or error "socketpair failed: $!";
$options->{hooksock} = $childsock;
# for communicating the required number of blocks, we don't need
# bidirectional communication, so a pipe() is enough
# we don't communicate this via the hook communication because
# a) this would abuse the functionality exclusively for hooks
# b) it puts code writing the protocol outside of the helper/listener
# c) the forked listener process cannot communicate to its parent
pipe my $nblkreader, my $nblkwriter or error "pipe failed: $!";
if ($options->{mode} eq 'unshare') {
$pid = get_unshare_cmd(
sub {
@ -4621,21 +4609,19 @@ sub main() {
setup($options);
if (!$options->{dryrun} && $format eq 'ext2') {
my $numblocks = approx_disk_usage($options->{root});
debug "sending nblks";
print $childsock (
pack("n", length "$numblocks") . "nblks$numblocks");
$childsock->flush();
debug "waiting for okthx";
checkokthx $childsock;
}
print $childsock (pack('n', 0) . 'adios');
$childsock->flush();
close $childsock;
close $nblkreader;
if (!$options->{dryrun} && $format eq 'ext2') {
my $numblocks = approx_disk_usage($options->{root});
print $nblkwriter "$numblocks\n";
$nblkwriter->flush();
}
close $nblkwriter;
if ($options->{dryrun}) {
info "simulate creating tarball...";
} elsif (any { $_ eq $format } ('tar', 'squashfs', 'ext2')) {
@ -4690,20 +4676,19 @@ sub main() {
setup($options);
if (!$options->{dryrun} && $format eq 'ext2') {
my $numblocks = approx_disk_usage($options->{root});
print $childsock (
pack("n", length "$numblocks") . "nblks$numblocks");
$childsock->flush();
debug "waiting for okthx";
checkokthx $childsock;
}
print $childsock (pack('n', 0) . 'adios');
$childsock->flush();
close $childsock;
close $nblkreader;
if (!$options->{dryrun} && $format eq 'ext2') {
my $numblocks = approx_disk_usage($options->{root});
print $nblkwriter $numblocks;
$nblkwriter->flush();
}
close $nblkwriter;
if ($options->{dryrun}) {
info "simulate creating tarball...";
} elsif (any { $_ eq $format } ('tar', 'squashfs', 'ext2')) {
@ -4827,6 +4812,13 @@ sub main() {
close $parentsock;
my $numblocks = 0;
close $nblkwriter;
if (!$options->{dryrun} && $format eq 'ext2') {
chomp($numblocks = <$nblkreader>);
}
close $nblkreader;
if ($options->{dryrun}) {
# nothing to do
} elsif ($format eq 'directory') {