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import-tars: read overlong names from pax extended header 

Importing gcc tarballs[1] with import-tars script (in contrib) fails
when hitting a pax extended header.

Make sure we always read the extended attributes from the pax entries,
and store the 'path' value if found to be used in the next ustar entry.

The code to parse pax extended headers was written consulting the Pax
Pax Interchange Format documentation [2].

[1] http://ftp.gnu.org/gnu/gcc/gcc-7.3.0/gcc-7.3.0.tar.xz
[2] https://www.freebsd.org/cgi/man.cgi?manpath=FreeBSD+8-current&query=tar&sektion=5

Signed-off-by: Pedro Alvarez <palvarez89@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Pedro Alvarez Piedehierro 2018-05-23 23:54:17 +01:00 committed by Junio C Hamano
parent 468165c1d8
commit 12ecea46e3
1 changed files with 29 additions and 2 deletions
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31
contrib/fast-import/import-tars.perl
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@ -63,6 +63,8 @@
my $have_top_dir = 1;
my ($top_dir, %files);
my $next_path = '';
while (read(I, $_, 512) == 512) {
my ($name, $mode, $uid, $gid, $size, $mtime,
$chksum, $typeflag, $linkname, $magic,
@ -70,6 +72,13 @@
$prefix) = unpack 'Z100 Z8 Z8 Z8 Z12 Z12
Z8 Z1 Z100 Z6
Z2 Z32 Z32 Z8 Z8 Z*', $_;
unless ($next_path eq '') {
# Recover name from previous extended header
$name = $next_path;
$next_path = '';
}
last unless length($name);
if ($name eq '././@LongLink') {
# GNU tar extension
@ -90,13 +99,31 @@
Z8 Z1 Z100 Z6
Z2 Z32 Z32 Z8 Z8 Z*', $_;
}
next if $name =~ m{/\z};
$mode = oct $mode;
$size = oct $size;
$mtime = oct $mtime;
next if $typeflag == 5; # directory
if ($typeflag != 1) { # handle hard links later
if ($typeflag eq 'x') { # extended header
# If extended header, check for path
my $pax_header = '';
while ($size > 0 && read(I, $_, 512) == 512) {
$pax_header = $pax_header . substr($_, 0, $size);
$size -= 512;
}
my @lines = split /\n/, $pax_header;
foreach my $line (@lines) {
my ($len, $entry) = split / /, $line;
my ($key, $value) = split /=/, $entry;
if ($key eq 'path') {
$next_path = $value;
}
}
next;
} elsif ($name =~ m{/\z}) { # directory
next;
} elsif ($typeflag != 1) { # handle hard links later
print FI "blob\n", "mark :$next_mark\n";
if ($typeflag == 2) { # symbolic link
print FI "data ", length($linkname), "\n",