forked from josch/mmdebstrap
refactor worker function to remove code duplication
Thanks: Guillem Jover <guillem@debian.org>
This commit is contained in:
parent
d244f4f1de
commit
113532b3e1
GPG key ID:
F2CBA5C78FBD83E1
1 changed files with 96 additions and 154 deletions
250
mmdebstrap
250
mmdebstrap
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@ -5963,8 +5963,6 @@ sub main() {
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my $sigset = POSIX::SigSet->new(SIGINT, SIGHUP, SIGPIPE, SIGTERM);
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my $sigset = POSIX::SigSet->new(SIGINT, SIGHUP, SIGPIPE, SIGTERM);
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POSIX::sigprocmask(SIG_BLOCK, $sigset) or error "Can't block signals: $!";
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POSIX::sigprocmask(SIG_BLOCK, $sigset) or error "Can't block signals: $!";
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my $pid;
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# a pipe to transfer the final tarball from the child to the parent
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# a pipe to transfer the final tarball from the child to the parent
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pipe my $rfh, my $wfh;
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pipe my $rfh, my $wfh;
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@ -5979,163 +5977,107 @@ sub main() {
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# b) it puts code writing the protocol outside of the helper/listener
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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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# 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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pipe my $nblkreader, my $nblkwriter or error "pipe failed: $!";
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my $worker = sub {
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# child
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local $SIG{'INT'} = 'DEFAULT';
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local $SIG{'HUP'} = 'DEFAULT';
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local $SIG{'PIPE'} = 'DEFAULT';
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local $SIG{'TERM'} = 'DEFAULT';
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# unblock all delayed signals (and possibly handle them)
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POSIX::sigprocmask(SIG_UNBLOCK, $sigset)
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or error "Can't unblock signals: $!";
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close $rfh;
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close $parentsock;
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open(STDOUT, '>&', STDERR) or error "cannot open STDOUT: $!";
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setup($options);
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print $childsock (pack('n', 0) . 'adios');
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$childsock->flush();
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close $childsock;
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close $nblkreader;
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if (!$options->{dryrun} && $options->{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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info "simulate creating tarball...";
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} elsif (any { $_ eq $options->{format} } ('tar', 'squashfs', 'ext2'))
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{
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info "creating tarball...";
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# redirect tar output to the writing end of the pipe so
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# that the parent process can capture the output
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open(STDOUT, '>&', $wfh) or error "cannot open STDOUT: $!";
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# Add ./dev as the first entries of the tar file.
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# We cannot add them after calling tar, because there is no
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# way to prevent tar from writing NULL entries at the end.
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if (any { $_ eq 'output/dev' } @{ $options->{skip} }) {
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info "skipping output/dev as requested";
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} else {
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print $devtar;
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}
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if ($options->{mode} eq 'unshare') {
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# pack everything except ./dev
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0 == system('tar', @taropts, '-C', $options->{root}, '.')
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or error "tar failed: $?";
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} elsif ($options->{mode} eq 'fakechroot') {
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# By default, FAKECHROOT_EXCLUDE_PATH includes /proc and /sys
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# which means that the resulting tarball will contain the
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# permission and ownership information of /proc and /sys from
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# the outside, which we want to avoid.
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## no critic (Variables::RequireLocalizedPunctuationVars)
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$ENV{FAKECHROOT_EXCLUDE_PATH} = "/dev";
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# Fakechroot requires tar to run inside the chroot or otherwise
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# absolute symlinks will include the path to the root directory
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0 == system('chroot', $options->{root}, 'tar',
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@taropts, '-C', '/', '.')
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or error "tar failed: $?";
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} elsif (any { $_ eq $options->{mode} } ('root', 'chrootless')) {
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# If the chroot directory is not owned by the root user, then
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# we assume that no measure was taken to fake root permissions.
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# Since the final tarball should contain entries with root
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# ownership, we instruct tar to do so.
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my @owneropts = ();
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if ((stat $options->{root})[4] != 0) {
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push @owneropts, '--owner=0', '--group=0',
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'--numeric-owner';
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}
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0 == system('tar', @taropts, @owneropts, '-C',
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$options->{root}, '.')
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or error "tar failed: $?";
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} else {
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error "unknown mode: $options->{mode}";
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}
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info "done";
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} elsif (any { $_ eq $options->{format} } ('directory', 'null')) {
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# nothing to do
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} else {
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error "unknown format: $options->{format}";
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}
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exit 0;
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};
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my $pid;
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if ($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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$pid = get_unshare_cmd($worker, \@idmap);
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sub {
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# child
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local $SIG{'INT'} = 'DEFAULT';
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local $SIG{'HUP'} = 'DEFAULT';
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local $SIG{'PIPE'} = 'DEFAULT';
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local $SIG{'TERM'} = 'DEFAULT';
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# unblock all delayed signals (and possibly handle them)
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POSIX::sigprocmask(SIG_UNBLOCK, $sigset)
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or error "Can't unblock signals: $!";
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close $rfh;
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close $parentsock;
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open(STDOUT, '>&', STDERR) or error "cannot open STDOUT: $!";
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setup($options);
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print $childsock (pack('n', 0) . 'adios');
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$childsock->flush();
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close $childsock;
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close $nblkreader;
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if (!$options->{dryrun} && $options->{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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info "simulate creating tarball...";
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} elsif (any { $_ eq $options->{format} }
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('tar', 'squashfs', 'ext2')) {
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info "creating tarball...";
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# redirect tar output to the writing end of the pipe so
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# that the parent process can capture the output
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open(STDOUT, '>&', $wfh) or error "cannot open STDOUT: $!";
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# Add ./dev as the first entries of the tar file.
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# We cannot add them after calling tar, because there is no
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# way to prevent tar from writing NULL entries at the end.
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if (any { $_ eq 'output/dev' } @{ $options->{skip} }) {
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info "skipping output/dev as requested";
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} else {
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print $devtar;
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}
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# pack everything except ./dev
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0 == system('tar', @taropts, '-C', $options->{root}, '.')
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or error "tar failed: $?";
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info "done";
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} elsif (any { $_ eq $options->{format} }
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('directory', 'null')) {
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# nothing to do
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} else {
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error "unknown format: $options->{format}";
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}
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exit 0;
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},
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\@idmap
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);
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} elsif (any { $_ eq $options->{mode} }
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} elsif (any { $_ eq $options->{mode} }
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('root', 'fakechroot', 'chrootless')) {
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('root', 'fakechroot', 'chrootless')) {
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$pid = fork() // error "fork() failed: $!";
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$pid = fork() // error "fork() failed: $!";
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if ($pid == 0) {
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if ($pid == 0) {
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local $SIG{'INT'} = 'DEFAULT';
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$worker->();
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local $SIG{'HUP'} = 'DEFAULT';
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local $SIG{'PIPE'} = 'DEFAULT';
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local $SIG{'TERM'} = 'DEFAULT';
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# unblock all delayed signals (and possibly handle them)
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POSIX::sigprocmask(SIG_UNBLOCK, $sigset)
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or error "Can't unblock signals: $!";
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close $rfh;
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close $parentsock;
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open(STDOUT, '>&', STDERR) or error "cannot open STDOUT: $!";
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setup($options);
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print $childsock (pack('n', 0) . 'adios');
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$childsock->flush();
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close $childsock;
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close $nblkreader;
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if (!$options->{dryrun} && $options->{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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info "simulate creating tarball...";
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} elsif (any { $_ eq $options->{format} }
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('tar', 'squashfs', 'ext2')) {
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info "creating tarball...";
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# redirect tar output to the writing end of the pipe so that
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# the parent process can capture the output
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open(STDOUT, '>&', $wfh) or error "cannot open STDOUT: $!";
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# Add ./dev as the first entries of the tar file.
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# We cannot add them after calling tar, because there is no way
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# to prevent tar from writing NULL entries at the end.
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if (any { $_ eq 'output/dev' } @{ $options->{skip} }) {
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info "skipping output/dev as requested";
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} else {
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print $devtar;
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}
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if ($options->{mode} eq 'fakechroot') {
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# By default, FAKECHROOT_EXCLUDE_PATH includes /proc and
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# /sys which means that the resulting tarball will contain
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# the permission and ownership information of /proc and
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# /sys from the outside, which we want to avoid.
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## no critic (Variables::RequireLocalizedPunctuationVars)
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$ENV{FAKECHROOT_EXCLUDE_PATH} = "/dev";
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# Fakechroot requires tar to run inside the chroot or
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# otherwise absolute symlinks will include the path to the
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# root directory
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0 == system('chroot', $options->{root}, 'tar',
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@taropts, '-C', '/', '.')
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or error "tar failed: $?";
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} elsif (any { $_ eq $options->{mode} } ('root', 'chrootless'))
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{
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# If the chroot directory is not owned by the root user,
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# then we assume that no measure was taken to fake root
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# permissions. Since the final tarball should contain
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# entries with root ownership, we instruct tar to do so.
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my @owneropts = ();
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if ((stat $options->{root})[4] != 0) {
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push @owneropts, '--owner=0', '--group=0',
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'--numeric-owner';
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}
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0 == system('tar', @taropts, @owneropts, '-C',
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$options->{root}, '.')
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or error "tar failed: $?";
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} else {
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error "unknown mode: $options->{mode}";
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}
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info "done";
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} elsif (any { $_ eq $options->{format} } ('directory', 'null')) {
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# nothing to do
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} else {
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error "unknown format: $options->{format}";
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}
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exit 0;
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}
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}
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} else {
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} else {
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error "unknown mode: $options->{mode}";
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error "unknown mode: $options->{mode}";
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