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