#!/usr/bin/perl
## tar archive frontend for git-fast-import
##
## For example:
##
## mkdir project; cd project; git init
## perl import-tars.perl *.tar.bz2
## git whatchanged import-tars
##
## Use --metainfo to specify the extension for a meta data file, where
## import-tars can read the commit message and optionally author and
## committer information.
##
## echo 'This is the commit message' > myfile.tar.bz2.msg
## perl import-tars.perl --metainfo=msg myfile.tar.bz2
use strict;
use Getopt::Long;
my $metaext = '';
die "usage: import-tars [--metainfo=extension] *.tar.{gz,bz2,lzma,xz,Z}\n"
unless GetOptions('metainfo=s' => \$metaext) && @ARGV;
my $branch_name = 'import-tars';
my $branch_ref = "refs/heads/$branch_name";
my $author_name = $ENV{'GIT_AUTHOR_NAME'} || 'T Ar Creator';
my $author_email = $ENV{'GIT_AUTHOR_EMAIL'} || 'tar@example.com';
my $committer_name = $ENV{'GIT_COMMITTER_NAME'} || `git config --get user.name`;
my $committer_email = $ENV{'GIT_COMMITTER_EMAIL'} || `git config --get user.email`;
chomp($committer_name, $committer_email);
open(FI, '|-', 'git', 'fast-import', '--quiet')
or die "Unable to start git fast-import: $!\n";
foreach my $tar_file (@ARGV)
{
my $commit_time = time;
$tar_file =~ m,([^/]+)$,;
my $tar_name = $1;
if ($tar_name =~ s/\.(tar\.gz|tgz)$//) {
open(I, '-|', 'gunzip', '-c', $tar_file)
or die "Unable to gunzip -c $tar_file: $!\n";
} elsif ($tar_name =~ s/\.(tar\.bz2|tbz2)$//) {
open(I, '-|', 'bunzip2', '-c', $tar_file)
or die "Unable to bunzip2 -c $tar_file: $!\n";
} elsif ($tar_name =~ s/\.tar\.Z$//) {
open(I, '-|', 'uncompress', '-c', $tar_file)
or die "Unable to uncompress -c $tar_file: $!\n";
} elsif ($tar_name =~ s/\.(tar\.(lzma|xz)|(tlz|txz))$//) {
open(I, '-|', 'xz', '-dc', $tar_file)
or die "Unable to xz -dc $tar_file: $!\n";
} elsif ($tar_name =~ s/\.tar$//) {
open(I, $tar_file) or die "Unable to open $tar_file: $!\n";
} else {
die "Unrecognized compression format: $tar_file\n";
}
my $author_time = 0;
my $next_mark = 1;
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,
$version, $uname, $gname, $devmajor, $devminor,
$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
if (read(I, $_, 512) != 512) {
die ('Short archive');
}
$name = unpack 'Z257', $_;
next unless $name;
my $dummy;
if (read(I, $_, 512) != 512) {
die ('Short archive');
}
($dummy, $mode, $uid, $gid, $size, $mtime,
$chksum, $typeflag, $linkname, $magic,
$version, $uname, $gname, $devmajor, $devminor,
$prefix) = unpack 'Z100 Z8 Z8 Z8 Z12 Z12
Z8 Z1 Z100 Z6
Z2 Z32 Z32 Z8 Z8 Z*', $_;
}
$mode = oct $mode;
$size = oct $size;
$mtime = oct $mtime;
next if $typeflag == 5; # directory
if ($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",
$linkname;
$mode = 0120000;
} else {
print FI "data $size\n";
while ($size > 0 && read(I, $_, 512) == 512) {
print FI substr($_, 0, $size);
$size -= 512;
}
}
print FI "\n";
}
next if ($typeflag eq 'g'); # ignore global header
my $path;
if ($prefix) {
$path = "$prefix/$name";
} else {
$path = "$name";
}
if ($typeflag == 1) { # hard link
$linkname = "$prefix/$linkname" if $prefix;
$files{$path} = [ $files{$linkname}->[0], $mode ];
} else {
$files{$path} = [$next_mark++, $mode];
}
$author_time = $mtime if $mtime > $author_time;
$path =~ m,^([^/]+)/,;
$top_dir = $1 unless $top_dir;
$have_top_dir = 0 if $top_dir ne $1;
}
my $commit_msg = "Imported from $tar_file.";
my $this_committer_name = $committer_name;
my $this_committer_email = $committer_email;
my $this_author_name = $author_name;
my $this_author_email = $author_email;
if ($metaext ne '') {
# Optionally read a commit message from <filename.tar>.msg
# Add a line on the form "Committer: name <e-mail>" to override
# the committer and "Author: name <e-mail>" to override the
# author for this tar ball.
if (open MSG, '<', "${tar_file}.${metaext}") {
my $header_done = 0;
$commit_msg = '';
while (<MSG>) {
if (!$header_done && /^Committer:\s+([^<>]*)\s+<(.*)>\s*$/i) {
$this_committer_name = $1;
$this_committer_email = $2;
} elsif (!$header_done && /^Author:\s+([^<>]*)\s+<(.*)>\s*$/i) {
$this_author_name = $1;
$this_author_email = $2;
} elsif (!$header_done && /^$/) { # empty line ends header.
$header_done = 1;
} else {
$commit_msg .= $_;
$header_done = 1;
}
}
close MSG;
}
}
print FI <<EOF;
commit $branch_ref
author $this_author_name <$this_author_email> $author_time +0000
committer $this_committer_name <$this_committer_email> $commit_time +0000
data <<END_OF_COMMIT_MESSAGE
$commit_msg
END_OF_COMMIT_MESSAGE
deleteall
EOF
foreach my $path (keys %files)
{
my ($mark, $mode) = @{$files{$path}};
$path =~ s,^([^/]+)/,, if $have_top_dir;
$mode = $mode & 0111 ? 0755 : 0644 unless $mode == 0120000;
printf FI "M %o :%i %s\n", $mode, $mark, $path;
}
print FI "\n";
print FI <<EOF;
tag $tar_name
from $branch_ref
tagger $author_name <$author_email> $author_time +0000
data <<END_OF_TAG_MESSAGE
Package $tar_name
END_OF_TAG_MESSAGE
EOF
close I;
}
close FI;
