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