tar2git

#!/usr/bin/env ruby

require 'fileutils'

ENV['GIT_AUTHOR_NAME']  = ENV['GIT_COMMITTER_NAME']  = ENV['T2G_NAME']  || `git config --get user.name`
ENV['GIT_AUTHOR_EMAIL'] = ENV['GIT_COMMITTER_EMAIL'] = ENV['T2G_EMAIL'] || `git config --get user.email`

if ARGV.size < 2
	STDERR.puts "Usage: #{File.basename $PROGRAM_NAME} <OUTDIR> <TARBALL> [TARBALL...]"
	exit 1
end

directory = File.expand_path ARGV[0]
if File.exist? directory
	STDERR.puts "Error: #{directory} already exists!"
	exit 1
end

exit 1 unless system 'git', 'init', '--bare', directory

ARGV[1..-1].each do |tarfile|
	tarpath = File.expand_path tarfile
	unless File.file? tarpath
		STDERR.puts "Error: #{tarpath} is not a file!"
		exit 1
	end

	outpath = "#{tarpath}.out"
	if File.exist? outpath
		STDERR.puts "Error: #{outpath} already exists!"
		exit 1
	end

	FileUtils.mkdir_p outpath
	exit 1 unless system 'tar', 'fx', tarpath, '-C', outpath

	entries = Dir.entries(outpath).reject { |entry| entry =~ /^\.\.?$/ }
	if entries.count == 1
		outpath = File.join outpath, entries.first
		ENV['GIT_AUTHOR_DATE'] = ENV['GIT_COMMITTER_DATE'] = File.mtime(outpath).to_s
	else
		ENV.delete 'GIT_AUTHOR_DATE'
		ENV.delete 'GIT_COMMITTER_DATE'
	end

	message = File.basename(tarfile, '.*').gsub(/[_-]/, ' ')
	exit 1 unless system 'git', '--git-dir', directory, '--work-tree', outpath, 'add', '--all'
	exit 1 unless system 'git', '--git-dir', directory, '--work-tree', outpath, 'commit', '-m', message

	FileUtils.rm_rf outpath
end