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add verbose mode to test_unshare() so that it can report what went wrong

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Johannes 'josch' Schauer 2018-12-05 08:06:26 +01:00
parent 3ffc8ea35f
commit b0979d1d6b
Signed by untrusted user: josch
GPG key ID: F2CBA5C78FBD83E1
1 changed files with 25 additions and 23 deletions
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mmdebstrap
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@ -87,8 +87,12 @@ sub get_tar_compress_options($) {
return (); return ();
} }
sub test_unshare() { sub test_unshare($) {
my $verbose = shift;
if ($EFFECTIVE_USER_ID == 0) { if ($EFFECTIVE_USER_ID == 0) {
if ($verbose) {
print STDERR "E: cannot use unshare mode when executing as root\n";
}
return 0; return 0;
} }
# arguments to syscalls have to be stored in their own variable or # arguments to syscalls have to be stored in their own variable or
@ -99,9 +103,12 @@ sub test_unshare() {
my $pid = fork() // die "fork() failed: $!"; my $pid = fork() // die "fork() failed: $!";
if ($pid == 0) { if ($pid == 0) {
my $ret = syscall &SYS_unshare, $unshare_flags; my $ret = syscall &SYS_unshare, $unshare_flags;
if (($ret >> 8) == 0) { if ($ret == 0) {
exit 0; exit 0;
} else { } else {
if ($verbose) {
print STDERR "E: unshare syscall failed: $!\n";
}
exit 1; exit 1;
} }
} }
@ -113,10 +120,24 @@ sub test_unshare() {
# executed without parameters # executed without parameters
system "newuidmap 2>/dev/null"; system "newuidmap 2>/dev/null";
if (($? >> 8) != 1) { if (($? >> 8) != 1) {
if ($verbose) {
if (($? >> 8) == 127) {
print STDERR "E: cannot find newuidmap\n";
} else {
print STDERR "E: newuidmap returned unknown exit status\n";
}
}
return 0; return 0;
} }
system "newgidmap 2>/dev/null"; system "newgidmap 2>/dev/null";
if (($? >> 8) != 1) { if (($? >> 8) != 1) {
if ($verbose) {
if (($? >> 8) == 127) {
print STDERR "E: cannot find newgidmap\n";
} else {
print STDERR "E: newgidmap returned unknown exit status\n";
}
}
return 0; return 0;
} }
return 1; return 1;
@ -1392,7 +1413,7 @@ sub main() {
if ($options->{mode} eq 'auto') { if ($options->{mode} eq 'auto') {
if ($EFFECTIVE_USER_ID == 0) { if ($EFFECTIVE_USER_ID == 0) {
$options->{mode} = 'root'; $options->{mode} = 'root';
} elsif (test_unshare()) { } elsif (test_unshare(0)) {
$options->{mode} = 'unshare'; $options->{mode} = 'unshare';
} elsif (system('proot --version>/dev/null') == 0) { } elsif (system('proot --version>/dev/null') == 0) {
$options->{mode} = 'proot'; $options->{mode} = 'proot';
@ -1432,26 +1453,7 @@ sub main() {
exec 'fakechroot', 'fakeroot', $PROGRAM_NAME, @ARGVORIG; exec 'fakechroot', 'fakeroot', $PROGRAM_NAME, @ARGVORIG;
} }
} elsif ($options->{mode} eq 'unshare') { } elsif ($options->{mode} eq 'unshare') {
if (!test_unshare()) { if (!test_unshare(1)) {
if ($EFFECTIVE_USER_ID == 0) {
print STDERR "I: cannot use unshare mode when executing as root\n";
}
system "newuidmap 2>/dev/null";
if (($? >> 8) != 1) {
if (($? >> 8) == 127) {
print STDERR "I: cannot find newuidmap\n";
} else {
print STDERR "I: newuidmap returned unknown exit status\n";
}
}
system "newgidmap 2>/dev/null";
if (($? >> 8) != 1) {
if (($? >> 8) == 127) {
print STDERR "I: cannot find newgidmap\n";
} else {
print STDERR "I: newgidmap returned unknown exit status\n";
}
}
my $procfile = '/proc/sys/kernel/unprivileged_userns_clone'; my $procfile = '/proc/sys/kernel/unprivileged_userns_clone';
open(my $fh, '<', $procfile) or die "failed to open $procfile: $!"; open(my $fh, '<', $procfile) or die "failed to open $procfile: $!";
chomp(my $content = do { local $/; <$fh> }); chomp(my $content = do { local $/; <$fh> });