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@ -1951,6 +1951,28 @@ sub main() {
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};
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chomp (my $hostarch = `dpkg --print-architecture`);
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if ($hostarch ne $nativearch) {
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my $withemu = 0;
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my $noemu = 0;
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{
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my $pid = open my $fh, '-|' // error "failed to fork(): $!";
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if ($pid == 0) {
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{
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no warnings; # don't print a warning if the following fails
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exec 'arch-test', $nativearch;
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}
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# if exec didn't work (for example because the arch-test program is
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# missing) prepare for the worst and assume that the architecture
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# cannot be executed
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print "$nativearch: not supported on this machine/kernel\n";
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exit 1;
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}
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chomp (my $content = do { local $/; <$fh> });
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close $fh;
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if ($? == 0 and $content eq "$nativearch: ok") {
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$withemu = 1;
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}
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}
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{
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my $pid = open my $fh, '-|' // error "failed to fork(): $!";
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if ($pid == 0) {
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{
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@ -1965,12 +1987,20 @@ sub main() {
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}
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chomp (my $content = do { local $/; <$fh> });
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close $fh;
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if ($? != 0 or $content ne "$nativearch: ok") {
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info "$nativearch cannot be executed, falling back to qemu-user";
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if (!exists $deb2qemu->{$nativearch}) {
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error "no mapping from $nativearch to qemu-user binary";
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if ($? == 0 and $content eq "$nativearch: ok") {
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$noemu = 1;
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}
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$options->{qemu} = $deb2qemu->{$nativearch};
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}
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# four different outcomes, depending on whether arch-test
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# succeeded with or without emulation
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#
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# withemu | noemu |
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# --------+-------+-----------------
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# 0 | 0 | test why emu doesn't work and quit
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# 0 | 1 | should never happen
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# 1 | 0 | use qemu emulation
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# 1 | 1 | don't use qemu emulation
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if ($withemu == 0 and $noemu == 0) {
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{
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open my $fh, '<', '/proc/filesystems' or error "failed to open /proc/filesystems: $!";
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unless (grep /^nodev\tbinfmt_misc$/, (<$fh>)) {
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@ -1993,8 +2023,19 @@ sub main() {
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error "qemu-$options->{qemu} is not a supported binfmt name";
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}
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}
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error "qemu emulation of $nativearch failed for an unknown reason";
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} elsif ($withemu == 0 and $noemu == 1) {
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error "arch-test succeeded without emu but not with emu";
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} elsif ($withemu == 1 and $noemu == 0) {
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info "$nativearch cannot be executed, falling back to qemu-user";
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if (!exists $deb2qemu->{$nativearch}) {
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error "no mapping from $nativearch to qemu-user binary";
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}
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$options->{qemu} = $deb2qemu->{$nativearch};
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} elsif ($withemu == 1 and $noemu == 1) {
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info "$nativearch is different from $hostarch but can be executed natively";
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} else {
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info "$nativearch can be executed on this $hostarch machine";
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error "logic error";
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}
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} else {
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info "chroot architecture $nativearch is equal to the host's architecture";
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