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make fakechroot mode bit-by-bit identical to the others

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This commit is contained in:
Johannes Schauer Marin Rodrigues 2021-08-27 19:50:11 +02:00
parent 7d472ca116
commit 6a8fbae9d8
Signed by untrusted user: josch
GPG key ID: F2CBA5C78FBD83E1
2 changed files with 62 additions and 34 deletions
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38
coverage.sh
View file

@ -753,7 +753,15 @@ else
fi
runuser -u user -- $CMD --mode=unshare --variant=$variant $DEFAULT_DIST /tmp/debian-chroot-unshare.$format $mirror
cmp /tmp/debian-chroot-root.$format /tmp/debian-chroot-unshare.$format
rm /tmp/debian-chroot-root.$format /tmp/debian-chroot-unshare.$format
rm /tmp/debian-chroot-unshare.$format
case $variant in essential|apt|minbase)
# /etc/ld.so.cache differs with some variants
runuser -u user -- $CMD --mode=fakechroot --variant=$variant $DEFAULT_DIST /tmp/debian-chroot-fakechroot.$format $mirror
cmp /tmp/debian-chroot-root.$format /tmp/debian-chroot-fakechroot.$format
rm /tmp/debian-chroot-fakechroot.$format
;;
esac
rm /tmp/debian-chroot-root.$format
END
if [ "$HAVE_QEMU" = "yes" ]; then
./run_qemu.sh
@ -1208,12 +1216,7 @@ prefix=
mkdir /tmp/mnt
mount /tmp/debian-chroot.ext2 /tmp/mnt
rmdir /tmp/mnt/lost+found
# in fakechroot mode, we use a fake ldconfig, so we have to
# artificially add some files
{ tar -C /tmp/mnt -c . | tar -t;
[ "$mode" = "fakechroot" ] && printf "./etc/ld.so.cache\n./var/cache/ldconfig/\n";
[ "$mode" = "fakechroot" ] && printf "./etc/.pwd.lock\n";
} | sort | diff -u tar1.txt -
tar -C /tmp/mnt -c . | tar -t | sort | diff -u tar1.txt -
umount /tmp/mnt
rmdir /tmp/mnt
rm /tmp/debian-chroot.ext2
@ -1239,9 +1242,7 @@ fi
adduser --gecos user --disabled-password user
sysctl -w kernel.unprivileged_userns_clone=0
runuser -u user -- $CMD --mode=auto --variant=apt $DEFAULT_DIST /tmp/debian-chroot.tar.gz $mirror
{ tar -tf /tmp/debian-chroot.tar.gz;
printf "./etc/ld.so.cache\n./var/cache/ldconfig/\n./etc/.pwd.lock\n";
} | sort | diff -u tar1.txt -
tar -tf /tmp/debian-chroot.tar.gz | sort | diff -u tar1.txt -
rm /tmp/debian-chroot.tar.gz
END
if [ "$HAVE_QEMU" = "yes" ]; then
@ -2651,12 +2652,7 @@ echo upload-customize | cmp /tmp/download-customize -
echo sync-in-setup | cmp /tmp/sync-out-setup/file -
echo sync-in-essential | cmp /tmp/sync-out-essential/file -
echo sync-in-customize | cmp /tmp/sync-out-customize/file -
# in fakechroot mode, we use a fake ldconfig, so we have to
# artificially add some files
{ tar -tf /tmp/debian-chroot.tar;
[ "$mode" = "fakechroot" ] && printf "./etc/ld.so.cache\n./var/cache/ldconfig/\n";
[ "$mode" = "fakechroot" ] && [ "$variant" != "essential" ] && printf "./etc/.pwd.lock\n";
} | sort | diff -u tar1.txt -
tar -tf /tmp/debian-chroot.tar | sort | diff -u tar1.txt -
rm /tmp/debian-chroot.tar \
/tmp/copy-in-setup /tmp/copy-in-essential /tmp/copy-in-customize \
/tmp/copy-out-setup /tmp/copy-out-essential /tmp/copy-out-customize \
@ -3192,12 +3188,7 @@ fi
prefix=
[ "\$(id -u)" -eq 0 ] && prefix="runuser -u user --"
\$prefix $CMD --mode=$mode --variant=$variant $DEFAULT_DIST /tmp/debian-chroot.tar $mirror
# in fakechroot mode, we use a fake ldconfig, so we have to
# artificially add some files
{ tar -tf /tmp/debian-chroot.tar;
[ "$mode" = "fakechroot" ] && printf "./etc/ld.so.cache\n./var/cache/ldconfig/\n";
[ "$mode" = "fakechroot" ] && [ "$variant" != "essential" ] && printf "./etc/.pwd.lock\n";
} | sort | diff -u "./$variant.txt" -
tar -tf /tmp/debian-chroot.tar | sort | diff -u "./$variant.txt" -
rm /tmp/debian-chroot.tar
END
if [ "$HAVE_QEMU" = "yes" ]; then
@ -3714,8 +3705,6 @@ prefix=
\$prefix $CMD --mode=$mode --variant=apt --architectures=arm64 $DEFAULT_DIST /tmp/debian-chroot.tar $mirror
# we ignore differences between architectures by ignoring some files
# and renaming others
# in fakechroot mode, we use a fake ldconfig, so we have to
# artificially add some files
# in proot mode, some extra files are put there by proot
{ tar -tf /tmp/debian-chroot.tar \
| grep -v '^\./lib/ld-linux-aarch64\.so\.1$' \
@ -3723,7 +3712,6 @@ prefix=
| grep -v '^\./usr/share/doc/[^/]\+/changelog\(\.Debian\)\?\.arm64\.gz$' \
| sed 's/aarch64-linux-gnu/x86_64-linux-gnu/' \
| sed 's/arm64/amd64/';
[ "$mode" = "fakechroot" ] && printf "./etc/ld.so.cache\n./var/cache/ldconfig/\n./etc/.pwd.lock\n";
} | sort > tar2.txt
{ cat tar1.txt \
| grep -v '^\./usr/bin/i386$' \

58
mmdebstrap
View file

@ -251,6 +251,24 @@ sub get_tar_compressor {
return;
}
# avoid dependency on String::ShellQuote by implementing the mechanism
# from python's shlex.quote function
sub shellescape {
my $string = shift;
if (length $string == 0) {
return "''";
}
# search for occurrences of characters that are not safe
# the 'a' regex modifier makes sure that \w only matches ASCII
if ($string !~ m/[^\w@\%+=:,.\/-]/a) {
return $string;
}
# wrap the string in single quotes and handle existing single quotes by
# putting them outside of the single-quoted string
$string =~ s/'/'"'"'/g;
return "'$string'";
}
sub test_unshare_userns {
my $verbose = shift;
if ($EFFECTIVE_USER_ID == 0) {
@ -1977,16 +1995,15 @@ sub run_setup() {
copy($tmpfile, \*STDERR);
}
if (any { $_ eq $options->{mode} } ('fakechroot', 'proot')) {
if (none { $_ eq $options->{mode} } ('fakechroot', 'proot')) {
# Apt dropping privileges to another user than root is not useful in
# fakechroot and proot mode because all users are faked and thus there
# is no real privilege difference anyways. Thus, we also print no
# warning message in this case.
open my $fh, '>>', $tmpfile
or error "cannot open $tmpfile for appending: $!";
print $fh "APT::Sandbox::User \"root\";\n";
close $fh;
} else {
# is no real privilege difference anyways. We could set
# APT::Sandbox::User "root" in fakechroot and proot mode but we don't
# because if we would, then /var/cache/apt/archives/partial/ and
# /var/lib/apt/lists/partial/ would not be owned by the _apt user
# if mmdebstrap was run in fakechroot or proot mode.
#
# when apt-get update is run by the root user, then apt will attempt to
# drop privileges to the _apt user. This will fail if the _apt user
# does not have permissions to read the root directory. In that case,
@ -2643,11 +2660,28 @@ sub run_prepare {
# /etc/fakechroot/debootstrap.env and
# /etc/fakechroot/chroot.env
{
# we add "$@" before "-r" such that any other "-r" options will be
# overwritten by the one we set
my $escapedroot = shellescape $options->{root};
my ($fh, $filename) = tempfile(
"mmdebstrap.ldconfig.XXXXXXXXXXXX",
UNLINK => 1,
TMPDIR => 1
);
print $fh <<EOF;
#!/bin/sh
set -e
if [ ! -e $escapedroot/sbin/ldconfig ]; then exit 0; fi
mkdir --mode=700 --parents $escapedroot/var/cache/ldconfig
$escapedroot/sbin/ldconfig "\$@" -r $escapedroot
EOF
close $fh;
chmod 0755, $filename or error "cannot chmod $filename";
my @fakechrootsubst = ();
foreach my $d ('/usr/sbin', '/usr/bin', '/sbin', '/bin') {
push @fakechrootsubst, "$d/chroot=/usr/sbin/chroot.fakechroot";
push @fakechrootsubst, "$d/mkfifo=/bin/true";
push @fakechrootsubst, "$d/ldconfig=/bin/true";
push @fakechrootsubst, "$d/ldconfig=$filename";
push @fakechrootsubst, "$d/ldd=/usr/bin/ldd.fakechroot";
push @fakechrootsubst, "$d/ischroot=/bin/true";
}
@ -5684,6 +5718,12 @@ sub main() {
}
if ($options->{mode} eq 'fakechroot') {
# By default, FAKECHROOT_EXCLUDE_PATH includes /proc and
# /sys which means that the resulting tarball will contain
# the permission and ownership information of /proc and
# /sys from the outside, which we want to avoid.
## no critic (Variables::RequireLocalizedPunctuationVars)
$ENV{FAKECHROOT_EXCLUDE_PATH} = "/dev";
# Fakechroot requires tar to run inside the chroot or
# otherwise absolute symlinks will include the path to the
# root directory