Johannes Schauer Marin Rodrigues
eca6cb314c
iputils-ping does not ship /bin/ping with xattrs anymore.
111 lines
3.9 KiB
Bash
111 lines
3.9 KiB
Bash
#!/bin/sh
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set -eu
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export LC_ALL=C.UTF-8
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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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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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