forked from josch/mmdebstrap
add a new pipe to communicate the number of blocks to the parent instead of abusing the hookhelper/listener
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a5ea38cbad
commit
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F2CBA5C78FBD83E1
1 changed files with 30 additions and 38 deletions
68
mmdebstrap
68
mmdebstrap
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@ -3257,24 +3257,6 @@ sub hooklistener {
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if ($? != 0) {
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if ($? != 0) {
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error "tar failed";
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error "tar failed";
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}
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}
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} elsif ($msg eq "nblks") {
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# handle the nblks message
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my $numblocks;
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debug "received message: nblks";
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{
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my $ret = read(STDIN, $numblocks, $len)
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// error "cannot read from socket: $!";
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if ($ret == 0) {
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error "received eof on socket";
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}
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}
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if ($numblocks !~ /^\d+$/) {
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error "invalid number of blocks: $numblocks";
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}
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debug "sending okthx";
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print STDOUT (pack("n", 0) . "okthx")
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or error "cannot write to socket: $!";
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STDOUT->flush();
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} else {
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} else {
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error "unknown message: $msg";
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error "unknown message: $msg";
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}
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}
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@ -4566,7 +4548,6 @@ sub main() {
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error "unknown format: $format";
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error "unknown format: $format";
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}
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}
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my $numblocks = 0;
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my $exitstatus = 0;
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my $exitstatus = 0;
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my @taropts = (
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my @taropts = (
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'--sort=name',
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'--sort=name',
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@ -4602,6 +4583,13 @@ sub main() {
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socketpair my $childsock, my $parentsock, AF_UNIX, SOCK_STREAM, PF_UNSPEC
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socketpair my $childsock, my $parentsock, AF_UNIX, SOCK_STREAM, PF_UNSPEC
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or error "socketpair failed: $!";
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or error "socketpair failed: $!";
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$options->{hooksock} = $childsock;
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$options->{hooksock} = $childsock;
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# for communicating the required number of blocks, we don't need
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# bidirectional communication, so a pipe() is enough
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# we don't communicate this via the hook communication because
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# a) this would abuse the functionality exclusively for hooks
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# b) it puts code writing the protocol outside of the helper/listener
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# c) the forked listener process cannot communicate to its parent
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pipe my $nblkreader, my $nblkwriter or error "pipe failed: $!";
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if ($options->{mode} eq 'unshare') {
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if ($options->{mode} eq 'unshare') {
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$pid = get_unshare_cmd(
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$pid = get_unshare_cmd(
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sub {
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sub {
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@ -4621,21 +4609,19 @@ sub main() {
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setup($options);
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setup($options);
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if (!$options->{dryrun} && $format eq 'ext2') {
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my $numblocks = approx_disk_usage($options->{root});
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debug "sending nblks";
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print $childsock (
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pack("n", length "$numblocks") . "nblks$numblocks");
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$childsock->flush();
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debug "waiting for okthx";
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checkokthx $childsock;
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}
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print $childsock (pack('n', 0) . 'adios');
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print $childsock (pack('n', 0) . 'adios');
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$childsock->flush();
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$childsock->flush();
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close $childsock;
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close $childsock;
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close $nblkreader;
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if (!$options->{dryrun} && $format eq 'ext2') {
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my $numblocks = approx_disk_usage($options->{root});
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print $nblkwriter "$numblocks\n";
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$nblkwriter->flush();
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}
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close $nblkwriter;
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if ($options->{dryrun}) {
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if ($options->{dryrun}) {
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info "simulate creating tarball...";
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info "simulate creating tarball...";
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} elsif (any { $_ eq $format } ('tar', 'squashfs', 'ext2')) {
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} elsif (any { $_ eq $format } ('tar', 'squashfs', 'ext2')) {
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@ -4690,20 +4676,19 @@ sub main() {
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setup($options);
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setup($options);
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if (!$options->{dryrun} && $format eq 'ext2') {
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my $numblocks = approx_disk_usage($options->{root});
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print $childsock (
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pack("n", length "$numblocks") . "nblks$numblocks");
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$childsock->flush();
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debug "waiting for okthx";
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checkokthx $childsock;
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}
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print $childsock (pack('n', 0) . 'adios');
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print $childsock (pack('n', 0) . 'adios');
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$childsock->flush();
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$childsock->flush();
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close $childsock;
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close $childsock;
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close $nblkreader;
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if (!$options->{dryrun} && $format eq 'ext2') {
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my $numblocks = approx_disk_usage($options->{root});
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print $nblkwriter $numblocks;
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$nblkwriter->flush();
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}
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close $nblkwriter;
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if ($options->{dryrun}) {
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if ($options->{dryrun}) {
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info "simulate creating tarball...";
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info "simulate creating tarball...";
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} elsif (any { $_ eq $format } ('tar', 'squashfs', 'ext2')) {
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} elsif (any { $_ eq $format } ('tar', 'squashfs', 'ext2')) {
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@ -4827,6 +4812,13 @@ sub main() {
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close $parentsock;
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close $parentsock;
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my $numblocks = 0;
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close $nblkwriter;
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if (!$options->{dryrun} && $format eq 'ext2') {
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chomp($numblocks = <$nblkreader>);
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}
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close $nblkreader;
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if ($options->{dryrun}) {
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if ($options->{dryrun}) {
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# nothing to do
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# nothing to do
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} elsif ($format eq 'directory') {
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} elsif ($format eq 'directory') {
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