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Stop copying qemu-$arch-static binary into the chroot

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- since qemu-user binfmt has support for pre-opening the interpreter
   since stretch, there is no reason to copy it into the chroot anymore
This commit is contained in:
Johannes Schauer Marin Rodrigues 2023-09-27 14:02:00 +02:00
parent bf41b91e6f
commit 21366f76b7
Signed by: josch
GPG key ID: F2CBA5C78FBD83E1
1 changed files with 42 additions and 83 deletions
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mmdebstrap
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@ -2772,90 +2772,49 @@ sub run_prepare {
error "unknown mode: $options->{mode}";
}
# copy qemu-user-static binary into chroot
if (defined $options->{qemu}) {
if ($options->{mode} eq 'fakechroot') {
# Make sure that the fakeroot and fakechroot shared
# libraries exist for the right architecture
open my $fh, '-|', 'dpkg-architecture', '-a',
$options->{nativearch},
'-qDEB_HOST_MULTIARCH' // error "failed to fork(): $!";
chomp(
my $deb_host_multiarch = do { local $/; <$fh> }
);
close $fh;
if (($? != 0) or (!$deb_host_multiarch)) {
error "dpkg-architecture failed: $?";
}
my $fakechrootdir = "/usr/lib/$deb_host_multiarch/fakechroot";
if (!-e "$fakechrootdir/libfakechroot.so") {
error "$fakechrootdir/libfakechroot.so doesn't exist."
. " Install libfakechroot:$options->{nativearch}"
. " outside the chroot";
}
my $fakerootdir = "/usr/lib/$deb_host_multiarch/libfakeroot";
if (!-e "$fakerootdir/libfakeroot-sysv.so") {
error "$fakerootdir/libfakeroot-sysv.so doesn't exist."
. " Install libfakeroot:$options->{nativearch}"
. " outside the chroot";
}
# The rest of this block sets environment variables, so we
# have to add the "no critic" statement to stop perlcritic
# from complaining about setting global variables
## no critic (Variables::RequireLocalizedPunctuationVars)
# fakechroot only fills LD_LIBRARY_PATH with the
# directories of the host's architecture. We append the
# directories of the chroot architecture.
$ENV{LD_LIBRARY_PATH}
= "$ENV{LD_LIBRARY_PATH}:$fakechrootdir:$fakerootdir";
# The binfmt support on the outside is used, so qemu needs
# to know where it has to look for shared libraries
if (defined $ENV{QEMU_LD_PREFIX}
&& $ENV{QEMU_LD_PREFIX} ne "") {
$ENV{QEMU_LD_PREFIX} = "$ENV{QEMU_LD_PREFIX}:$options->{root}";
} else {
$ENV{QEMU_LD_PREFIX} = $options->{root};
}
} elsif (any { $_ eq $options->{mode} } ('root', 'unshare')) {
my $require_qemu_static = 1;
# make $@ local, so we don't print an eventual error
# in other parts where we evaluate $@
local $@ = '';
eval {
# Check for the F flag which makes the kernel open the binfmt
# binary at configuration time instead of lazily at startup
# time. If the flag is set, then the qemu-static binary is not
# required inside the chroot.
if (-e "/proc/sys/fs/binfmt_misc/qemu-$options->{qemu}") {
open my $fh, '<',
"/proc/sys/fs/binfmt_misc/qemu-$options->{qemu}";
while (my $line = <$fh>) {
chomp($line);
if ($line =~ /^flags: [A-Z]*F[A-Z]*$/) {
$require_qemu_static = 0;
last;
}
}
close $fh;
}
};
if ($require_qemu_static) {
# other modes require a static qemu-user binary
my $qemubin = "/usr/bin/qemu-$options->{qemu}-static";
if (!-e $qemubin) {
error "cannot find $qemubin";
}
copy $qemubin, "$options->{root}/$qemubin"
or error "cannot copy $qemubin: $!";
# File::Copy does not retain permissions but on some
# platforms (like Travis CI) the binfmt interpreter must
# have the executable bit set or otherwise execve will
# fail with EACCES
chmod 0755, "$options->{root}/$qemubin"
or error "cannot chmod $qemubin: $!";
}
# foreign architecture setup for fakechroot mode
if (defined $options->{qemu} && $options->{mode} eq 'fakechroot') {
# Make sure that the fakeroot and fakechroot shared libraries exist for
# the right architecture
open my $fh, '-|', 'dpkg-architecture', '-a',
$options->{nativearch},
'-qDEB_HOST_MULTIARCH' // error "failed to fork(): $!";
chomp(
my $deb_host_multiarch = do { local $/; <$fh> }
);
close $fh;
if (($? != 0) or (!$deb_host_multiarch)) {
error "dpkg-architecture failed: $?";
}
my $fakechrootdir = "/usr/lib/$deb_host_multiarch/fakechroot";
if (!-e "$fakechrootdir/libfakechroot.so") {
error "$fakechrootdir/libfakechroot.so doesn't exist."
. " Install libfakechroot:$options->{nativearch}"
. " outside the chroot";
}
my $fakerootdir = "/usr/lib/$deb_host_multiarch/libfakeroot";
if (!-e "$fakerootdir/libfakeroot-sysv.so") {
error "$fakerootdir/libfakeroot-sysv.so doesn't exist."
. " Install libfakeroot:$options->{nativearch}"
. " outside the chroot";
}
# The rest of this block sets environment variables, so we have to add
# the "no critic" statement to stop perlcritic from complaining about
# setting global variables
## no critic (Variables::RequireLocalizedPunctuationVars)
# fakechroot only fills LD_LIBRARY_PATH with the directories of the
# host's architecture. We append the directories of the chroot
# architecture.
$ENV{LD_LIBRARY_PATH}
= "$ENV{LD_LIBRARY_PATH}:$fakechrootdir:$fakerootdir";
# The binfmt support on the outside is used, so qemu needs to know
# where it has to look for shared libraries
if (defined $ENV{QEMU_LD_PREFIX}
&& $ENV{QEMU_LD_PREFIX} ne "") {
$ENV{QEMU_LD_PREFIX} = "$ENV{QEMU_LD_PREFIX}:$options->{root}";
} else {
error "unknown mode: $options->{mode}";
$ENV{QEMU_LD_PREFIX} = $options->{root};
}
}