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send error package when anything goes wrong in special hook handling

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This commit is contained in:
Johannes 'josch' Schauer 2020-01-16 12:02:11 +01:00
parent 7d152ec7e0
commit 6e829ca066
Signed by untrusted user: josch
GPG key ID: F2CBA5C78FBD83E1
1 changed files with 23 additions and 38 deletions
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mmdebstrap
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@ -2328,10 +2328,11 @@ sub checkokthx {
return; return;
} }
sub main() { sub hookhelper {
umask 022; # we put everything in an eval block because that way we can easily handle
# errors without goto labels or much code duplication: the error handler
if (scalar @ARGV >= 7 && $ARGV[0] eq "--hook-helper") { # has to send an "error" message to the other side
eval {
my $root = $ARGV[1]; my $root = $ARGV[1];
my $mode = $ARGV[2]; my $mode = $ARGV[2];
my $hook = $ARGV[3]; my $hook = $ARGV[3];
@ -2475,10 +2476,6 @@ sub main() {
STDOUT->flush(); STDOUT->flush();
last; last;
} elsif ($msg ne "write") { } elsif ($msg ne "write") {
# we should not receive this message at this point
print STDOUT (pack("n", 0) . "error")
or error "cannot write to socket: $!";
STDOUT->flush();
error "expected write but got: $msg"; error "expected write but got: $msg";
} }
# read the payload # read the payload
@ -2605,7 +2602,21 @@ sub main() {
} else { } else {
error "unknown command: $command"; error "unknown command: $command";
} }
};
if ($@) {
# inform the other side that something went wrong
print STDOUT (pack("n", 0) . "error");
STDOUT->flush();
error "hookhelper failed: $@";
}
return;
}
sub main() {
umask 022;
if (scalar @ARGV >= 7 && $ARGV[0] eq "--hook-helper") {
hookhelper();
exit 0; exit 0;
} }
@ -3737,9 +3748,6 @@ sub main() {
} }
# make sure that the requested path exists outside the chroot # make sure that the requested path exists outside the chroot
if (!-e $infile) { if (!-e $infile) {
print $parentsock (pack("n", 0) . "error")
or error "cannot write to socket: $!";
$parentsock->flush();
error "$infile does not exist"; error "$infile does not exist";
} }
debug "sending okthx"; debug "sending okthx";
@ -3788,17 +3796,11 @@ sub main() {
my $outdir = dirname($outfile); my $outdir = dirname($outfile);
if (-e $outdir) { if (-e $outdir) {
if (!-d $outdir) { if (!-d $outdir) {
print $parentsock (pack("n", 0) . "error")
or error "cannot write to socket: $!";
$parentsock->flush();
error "$outdir already exists but is not a directory"; error "$outdir already exists but is not a directory";
} }
} else { } else {
my $num_created = make_path $outdir, { error => \my $err }; my $num_created = make_path $outdir, { error => \my $err };
if ($err && @$err) { if ($err && @$err) {
print $parentsock (pack("n", 0) . "error")
or error "cannot write to socket: $!";
$parentsock->flush();
error( error(
join "; ", join "; ",
( (
@ -3806,9 +3808,6 @@ sub main() {
@$err @$err
)); ));
} elsif ($num_created == 0) { } elsif ($num_created == 0) {
print $parentsock (pack("n", 0) . "error")
or error "cannot write to socket: $!";
$parentsock->flush();
error "cannot create $outdir"; error "cannot create $outdir";
} }
} }
@ -3846,9 +3845,6 @@ sub main() {
last; last;
} elsif ($msg ne "write") { } elsif ($msg ne "write") {
# we should not receive this message at this point # we should not receive this message at this point
print $parentsock (pack("n", 0) . "error")
or error "cannot write to socket: $!";
$parentsock->flush();
error "expected write but got: $msg"; error "expected write but got: $msg";
} }
# read the payload # read the payload
@ -3882,9 +3878,6 @@ sub main() {
} }
# make sure that the requested path exists outside the chroot # make sure that the requested path exists outside the chroot
if (!-e $indir) { if (!-e $indir) {
print $parentsock (pack("n", 0) . "error")
or error "cannot write to socket: $!";
$parentsock->flush();
error "$indir does not exist"; error "$indir does not exist";
} }
debug "sending okthx"; debug "sending okthx";
@ -3942,17 +3935,11 @@ sub main() {
# make sure that the directory exists # make sure that the directory exists
if (-e $outdir) { if (-e $outdir) {
if (!-d $outdir) { if (!-d $outdir) {
print $parentsock (pack("n", 0) . "error")
or error "cannot write to socket: $!";
$parentsock->flush();
error "$outdir already exists but is not a directory"; error "$outdir already exists but is not a directory";
} }
} else { } else {
my $num_created = make_path $outdir, { error => \my $err }; my $num_created = make_path $outdir, { error => \my $err };
if ($err && @$err) { if ($err && @$err) {
print $parentsock (pack("n", 0) . "error")
or error "cannot write to socket: $!";
$parentsock->flush();
error( error(
join "; ", join "; ",
( (
@ -3960,9 +3947,6 @@ sub main() {
@$err @$err
)); ));
} elsif ($num_created == 0) { } elsif ($num_created == 0) {
print $parentsock (pack("n", 0) . "error")
or error "cannot write to socket: $!";
$parentsock->flush();
error "cannot create $outdir"; error "cannot create $outdir";
} }
} }
@ -4000,9 +3984,6 @@ sub main() {
last; last;
} elsif ($msg ne "write") { } elsif ($msg ne "write") {
# we should not receive this message at this point # we should not receive this message at this point
print $parentsock (pack("n", 0) . "error")
or error "cannot write to socket: $!";
$parentsock->flush();
error "expected write but got: $msg"; error "expected write but got: $msg";
} }
# read the payload # read the payload
@ -4032,6 +4013,10 @@ sub main() {
} }
}; };
if ($@) { if ($@) {
# inform the other side that something went wrong
print $parentsock (pack("n", 0) . "error")
or error "cannot write to socket: $!";
$parentsock->flush();
# we cannot die here because that would leave the other thread # we cannot die here because that would leave the other thread
# running without a parent # running without a parent
warning "listening on child socket failed: $@"; warning "listening on child socket failed: $@";