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run several binfmt checks before using qemu-user mode

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Johannes 'josch' Schauer 2018-12-28 05:39:14 +01:00
parent 4a2bf62931
commit e6ce901be4
Signed by untrusted user: josch
GPG key ID: F2CBA5C78FBD83E1
1 changed files with 22 additions and 5 deletions
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27
mmdebstrap
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@ -1049,11 +1049,6 @@ sub setup {
# copy qemu-user-static binary into chroot or setup proot with --qemu
if (defined $options->{qemu}) {
# FIXME: check for
# - binfmt_misc kernel module loaded
# - binfmt_misc filesystem in /proc/filesystems
# - binfmt_misc mounted on /proc/sys/fs/binfmt_misc
# - /usr/sbin/update-binfmts --display qemu-arm
if ($options->{mode} eq 'proot') {
push @chrootcmd, "--qemu=qemu-$options->{qemu}";
} elsif ($options->{mode} eq 'fakechroot') {
@ -1588,6 +1583,28 @@ sub main() {
die "no mapping from $nativearch to qemu-user binary";
}
$options->{qemu} = $deb2qemu->{$nativearch};
{
open my $fh, '<', '/proc/filesystems' or die "failed to open /proc/filesystems: $!";
unless (grep /^nodev\tbinfmt_misc$/, (<$fh>)) {
die "binfmt_misc not found in /proc/filesystems -- is the module loaded?";
}
close $fh;
}
{
open my $fh, '<', '/proc/mounts' or die "failed to open /proc/mounts: $!";
unless (grep /^binfmt_misc \/proc\/sys\/fs\/binfmt_misc binfmt_misc/, (<$fh>)) {
die "binfmt_misc not found in /proc/mounts -- not mounted?";
}
close $fh;
}
{
open my $fh, '-|', '/usr/sbin/update-binfmts', '--display', "qemu-$options->{qemu}" // die "failed to fork(): $!";
chomp (my $binfmts = do { local $/; <$fh> });
close $fh;
if ($binfmts eq '') {
die "qemu-$options->{qemu} is not a supported binfmt name";
}
}
} else {
print STDERR "I: $nativearch can be executed on this $hostarch machine\n";
}