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tar archive frontend for fast-import.

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This is an example fast-import frontend, in less than 100 lines
of Perl.  It accepts one or more tar archives on the command line,
passes them through gzcat/bzcat/zcat if necessary, parses out the
individual file headers and feeds all contained data to fast-import.
No temporary files are involved.

Each tar is treated as one commit, with the commit timestamp coming
from the oldest file modification date found within the tar.

Each tar is also tagged with an annotated tag, using the basename
of the tar file as the name of the tag.

Currently symbolic links and hard links are not handled by the
importer.  The file checksums are also not verified.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This commit is contained in:
Shawn O. Pearce 2007-02-08 15:26:01 -05:00
parent 882227f117
commit 590dd4bfd2
1 changed files with 105 additions and 0 deletions
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105
contrib/fast-import/import-tars.perl Executable file
View file

@ -0,0 +1,105 @@
#!/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 strict;
die "usage: import-tars *.tar.{gz,bz2,Z}\n" unless @ARGV;
my $branch_name = 'import-tars';
my $branch_ref = "refs/heads/$branch_name";
my $committer_name = 'T Ar Creator';
my $committer_email = 'tar@example.com';
open(FI, '|-', 'git', 'fast-import', '--quiet')
or die "Unable to start git fast-import: $!\n";
foreach my $tar_file (@ARGV)
{
$tar_file =~ m,([^/]+)$,;
my $tar_name = $1;
if ($tar_name =~ s/\.(tar\.gz|tgz)$//) {
open(I, '-|', 'gzcat', $tar_file) or die "Unable to gzcat $tar_file: $!\n";
} elsif ($tar_name =~ s/\.(tar\.bz2|tbz2)$//) {
open(I, '-|', 'bzcat', $tar_file) or die "Unable to bzcat $tar_file: $!\n";
} elsif ($tar_name =~ s/\.tar\.Z$//) {
open(I, '-|', 'zcat', $tar_file) or die "Unable to zcat $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 $commit_time = 0;
my $next_mark = 1;
my $have_top_dir = 1;
my ($top_dir, %files);
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*', $_;
last unless $name;
$mode = oct $mode;
$size = oct $size;
$mtime = oct $mtime;
next if $mode & 0040000;
print FI "blob\n", "mark :$next_mark\n", "data $size\n";
while ($size > 0 && read(I, $_, 512) == 512) {
print FI substr($_, 0, $size);
$size -= 512;
}
print FI "\n";
my $path = "$prefix$name";
$files{$path} = [$next_mark++, $mode];
$commit_time = $mtime if $mtime > $commit_time;
$path =~ m,^([^/]+)/,;
$top_dir = $1 unless $top_dir;
$have_top_dir = 0 if $top_dir ne $1;
}
print FI <<EOF;
commit $branch_ref
committer $committer_name <$committer_email> $commit_time +0000
data <<END_OF_COMMIT_MESSAGE
Imported from $tar_file.
END_OF_COMMIT_MESSAGE
deleteall
EOF
foreach my $path (keys %files)
{
my ($mark, $mode) = @{$files{$path}};
my $git_mode = 0644;
$git_mode |= 0700 if $mode & 0111;
$path =~ s,^([^/]+)/,, if $have_top_dir;
printf FI "M %o :%i %s\n", $git_mode, $mark, $path;
}
print FI "\n";
print FI <<EOF;
tag $tar_name
from $branch_ref
tagger $committer_name <$committer_email> $commit_time +0000
data <<END_OF_TAG_MESSAGE
Package $tar_name
END_OF_TAG_MESSAGE
EOF
close I;
}
close FI;