forked from josch/mmdebstrap
tests/tarfilter-idshift: use a fabricated tarball instead of real chroot
iputils-ping does not ship /bin/ping with xattrs anymore.
This commit is contained in:
parent
395ee60a7f
commit
eca6cb314c
GPG key ID:
F2CBA5C78FBD83E1
1 changed files with 107 additions and 54 deletions
|
|
@ -1,58 +1,111 @@
|
||||||
#!/bin/sh
|
#!/bin/sh
|
||||||
set -eu
|
set -eu
|
||||||
export LC_ALL=C.UTF-8
|
export LC_ALL=C.UTF-8
|
||||||
if [ ! -e /mmdebstrap-testenv ]; then
|
|
||||||
echo "this test modifies the system and should only be run inside a container" >&2
|
trap "rm -f /tmp/mkpaxtar.pl /tmp/orig.tar /tmp/file /tmp/expected /tmp/filtered.tar" EXIT INT TERM
|
||||||
exit 1
|
|
||||||
fi
|
cat << 'END' > /tmp/mkpaxtar.pl
|
||||||
trap "rm -f /tmp/debian-chroot.tar /tmp/debian-chroot-shifted.tar /tmp/debian-chroot.txt /tmp/debian-chroot-shiftedback.tar /tmp/expected; rm -rf /tmp/debian-chroot" EXIT INT TERM
|
#!/usr/bin/env perl
|
||||||
useradd --home-dir /home/user --create-home user
|
|
||||||
echo user:100000:65536 | cmp /etc/subuid -
|
use strict;
|
||||||
echo user:100000:65536 | cmp /etc/subgid -
|
use warnings;
|
||||||
# include iputils-ping so that we can verify that tarfilter does not remove
|
|
||||||
# extended attributes
|
my @entries = (
|
||||||
# run through tarshift no-op to create a tarball that should be bit-by-bit
|
# filename mode type content
|
||||||
# identical to a round trip through "tarfilter --idshift X" and "tarfilter --idshift -X"
|
['./PaxHeaders/file', oct(644), 'x', "57 SCHILY.xattr.security.capability=\x01\0\0\x02\0\x20\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x0a"],
|
||||||
runuser -u user -- {{ CMD }} --mode=unshare --variant=apt --include=iputils-ping {{ DIST }} - {{ MIRROR }} \
|
['./file', oct(644), 0, 'test'],
|
||||||
| ./tarfilter --idshift 0 > /tmp/debian-chroot.tar
|
);
|
||||||
|
|
||||||
|
my $num_entries = 0;
|
||||||
|
|
||||||
|
foreach my $file (@entries) {
|
||||||
|
my ($fname, $mode, $type, $content) = @{$file};
|
||||||
|
my $entry = pack(
|
||||||
|
'a100 a8 a8 a8 a12 a12 A8 a1 a100 a6 a2 a32 a32 a8 a8 a155 x12',
|
||||||
|
$fname,
|
||||||
|
sprintf('%07o', $mode),
|
||||||
|
sprintf('%07o', 0), # uid
|
||||||
|
sprintf('%07o', 0), # gid
|
||||||
|
sprintf('%011o', length $content), # size
|
||||||
|
sprintf('%011o', 0), # mtime
|
||||||
|
'', # checksum
|
||||||
|
$type,
|
||||||
|
'', # linkname
|
||||||
|
"ustar", # magic
|
||||||
|
"00", # version
|
||||||
|
'', # username
|
||||||
|
'', # groupname
|
||||||
|
'', # dev major
|
||||||
|
'', # dev minor
|
||||||
|
'', # prefix
|
||||||
|
);
|
||||||
|
|
||||||
|
# compute and insert checksum
|
||||||
|
substr($entry, 148, 7)
|
||||||
|
= sprintf("%06o\0", unpack("%16C*", $entry));
|
||||||
|
print $entry;
|
||||||
|
$num_entries += 1;
|
||||||
|
|
||||||
|
if (length $content) {
|
||||||
|
print(pack 'a512', $content);
|
||||||
|
$num_entries += 1;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
# https://www.gnu.org/software/tar/manual/html_node/Standard.html
|
||||||
|
#
|
||||||
|
# Physically, an archive consists of a series of file entries terminated by an
|
||||||
|
# end-of-archive entry, which consists of two 512 blocks of zero bytes. At the
|
||||||
|
# end of the archive file there are two 512-byte blocks filled with binary
|
||||||
|
# zeros as an end-of-file marker.
|
||||||
|
|
||||||
|
print(pack 'a512', '');
|
||||||
|
print(pack 'a512', '');
|
||||||
|
$num_entries += 2;
|
||||||
|
|
||||||
|
# https://www.gnu.org/software/tar/manual/html_section/tar_76.html
|
||||||
|
#
|
||||||
|
# Some devices requires that all write operations be a multiple of a certain
|
||||||
|
# size, and so, tar pads the archive out to the next record boundary.
|
||||||
|
#
|
||||||
|
# The default blocking factor is 20. With a block size of 512 bytes, we get a
|
||||||
|
# record size of 10240.
|
||||||
|
|
||||||
|
for (my $i = $num_entries ; $i < 20 ; $i++) {
|
||||||
|
print(pack 'a512', '');
|
||||||
|
}
|
||||||
|
END
|
||||||
|
|
||||||
|
MMTARFILTER=
|
||||||
|
[ -x /usr/bin/mmtarfilter ] && MMTARFILTER=/usr/bin/mmtarfilter
|
||||||
|
[ -x ./tarfilter ] && MMTARFILTER=./tarfilter
|
||||||
|
|
||||||
|
perl /tmp/mkpaxtar.pl | "$MMTARFILTER" > /tmp/orig.tar
|
||||||
# make sure that xattrs are set in the original tarball
|
# make sure that xattrs are set in the original tarball
|
||||||
mkdir /tmp/debian-chroot
|
tar --xattrs --xattrs-include='*' --directory /tmp/ -xf /tmp/orig.tar ./file
|
||||||
tar --xattrs --xattrs-include='*' --directory /tmp/debian-chroot -xf /tmp/debian-chroot.tar ./usr/bin/ping
|
echo "/tmp/file cap_net_raw=ep" > /tmp/expected
|
||||||
echo "/tmp/debian-chroot/usr/bin/ping cap_net_raw=ep" > /tmp/expected
|
getcap /tmp/file | diff -u /tmp/expected - >&2
|
||||||
getcap /tmp/debian-chroot/usr/bin/ping | diff -u /tmp/expected - >&2
|
# make sure that the file content is as expected
|
||||||
rm /tmp/debian-chroot/usr/bin/ping
|
printf test | diff -u /tmp/file - >&2
|
||||||
rmdir /tmp/debian-chroot/usr/bin
|
# make sure that uid/gid are as expected in the original tarball
|
||||||
rmdir /tmp/debian-chroot/usr
|
echo "0 0 644" > /tmp/expected
|
||||||
rmdir /tmp/debian-chroot
|
stat --format="%u %g %a" /tmp/file | diff -u /tmp/expected - >&2
|
||||||
# shift the uid/gid forward by 100000 and backward by 100000
|
rm /tmp/file
|
||||||
./tarfilter --idshift 100000 < /tmp/debian-chroot.tar > /tmp/debian-chroot-shifted.tar
|
# tarball must be bit by-bit-identical after round-trip
|
||||||
./tarfilter --idshift -100000 < /tmp/debian-chroot-shifted.tar > /tmp/debian-chroot-shiftedback.tar
|
"$MMTARFILTER" --idshift 0 < /tmp/orig.tar > /tmp/filtered.tar
|
||||||
# the tarball before and after the roundtrip through tarfilter should be bit
|
cmp /tmp/orig.tar /tmp/filtered.tar
|
||||||
# by bit identical
|
|
||||||
cmp /tmp/debian-chroot.tar /tmp/debian-chroot-shiftedback.tar
|
# now shift uid/gid
|
||||||
# manually adjust uid/gid and compare "tar -t" output
|
"$MMTARFILTER" --idshift 100000 < /tmp/orig.tar > /tmp/filtered.tar
|
||||||
tar --numeric-owner -tvf /tmp/debian-chroot.tar \
|
# make sure that uid/gid are as expected in the filtered tarball
|
||||||
| sed 's# 42/0 # 100042/100000 #' \
|
tar --xattrs --xattrs-include='*' --directory /tmp/ -xf /tmp/filtered.tar ./file
|
||||||
| sed 's# 0/0 # 100000/100000 #' \
|
echo "100000 100000 644" > /tmp/expected
|
||||||
| sed 's# 0/5 # 100000/100005 #' \
|
stat --format="%u %g %a" /tmp/file | diff -u /tmp/expected - >&2
|
||||||
| sed 's# 0/8 # 100000/100008 #' \
|
rm /tmp/file
|
||||||
| sed 's# 0/42 # 100000/100042 #' \
|
|
||||||
| sed 's# 0/43 # 100000/100043 #' \
|
# now shift uid/gid back to create a round-trip
|
||||||
| sed 's# 0/50 # 100000/100050 #' \
|
"$MMTARFILTER" --idshift -100000 < /tmp/filtered.tar > /tmp/filtered2.tar
|
||||||
| sed 's/ \+/ /g' \
|
|
||||||
> /tmp/debian-chroot.txt
|
# the result must be identical to the original and will thus also include the
|
||||||
tar --numeric-owner -tvf /tmp/debian-chroot-shifted.tar \
|
# correct xattr information
|
||||||
| sed 's/ \+/ /g' \
|
cmp /tmp/orig.tar /tmp/filtered2.tar
|
||||||
| diff -u /tmp/debian-chroot.txt - >&2
|
|
||||||
mkdir /tmp/debian-chroot
|
|
||||||
tar --xattrs --xattrs-include='*' --directory /tmp/debian-chroot -xf /tmp/debian-chroot-shifted.tar
|
|
||||||
echo "100000 100000" > /tmp/expected
|
|
||||||
stat --format="%u %g" /tmp/debian-chroot/usr/bin/ping | diff -u /tmp/expected - >&2
|
|
||||||
echo "/tmp/debian-chroot/usr/bin/ping cap_net_raw=ep" > /tmp/expected
|
|
||||||
getcap /tmp/debian-chroot/usr/bin/ping | diff -u /tmp/expected - >&2
|
|
||||||
echo "0 0" > /tmp/expected
|
|
||||||
runuser -u user -- {{ CMD }} --unshare-helper /usr/sbin/chroot /tmp/debian-chroot stat --format="%u %g" /usr/bin/ping \
|
|
||||||
| diff -u /tmp/expected - >&2
|
|
||||||
echo "/usr/bin/ping cap_net_raw=ep" > /tmp/expected
|
|
||||||
runuser -u user -- {{ CMD }} --unshare-helper /usr/sbin/chroot /tmp/debian-chroot getcap /usr/bin/ping \
|
|
||||||
| diff -u /tmp/expected - >&2
|
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue