Example: Key: Value1 Value2 Value3 Before: "Value1Value2\nValue" After: "Value1\nValue2\nValue"
145 lines
4.7 KiB
Ruby
145 lines
4.7 KiB
Ruby
# Various helper methods to update the database of packages
|
|
|
|
require 'bzip2'
|
|
|
|
module DebImporter
|
|
|
|
# This module imports information about packages of a Linux distribution
|
|
# that uses the DEB package format like Debian, Ubuntu or Mint.
|
|
#
|
|
# It starts by loading the Release file of a release to get
|
|
# information about available components and architectures.
|
|
#
|
|
# Next it loads the Packages lists (prefers bz2, falls back to
|
|
# .gz or even the uncompressed version).
|
|
|
|
class Release
|
|
attr_reader :architectures, :components, :description, :codename, :origin, :version, :files
|
|
|
|
# Load and parse a Release file of an APT repository
|
|
def initialize(dist_url)
|
|
@dist_url = dist_url
|
|
release_url = dist_url + "/Release"
|
|
Rails.logger.debug "Loading Release file from #{release_url}"
|
|
open(release_url) do |release_data|
|
|
fields = get_fields(release_data)
|
|
@architectures = fields[:Architectures]
|
|
@components = fields[:Components]
|
|
@description = fields[:Description]
|
|
@codename = fields[:Codename]
|
|
@origin = fields[:Origin]
|
|
@version = fields[:Version]
|
|
|
|
# TODO: check sizes and checksums
|
|
end # open
|
|
end # def initialize
|
|
|
|
# Get package information from translation (i18n) files.
|
|
# Returns an enumerator of packages.
|
|
def i18n(component, language)
|
|
url = "#{@dist_url}/#{component}/i18n/Translation-en"
|
|
file = find_and_open_compressed_url(url)
|
|
return get_paragraphs(file)
|
|
end
|
|
|
|
# Look for the file or URL in various compressed formats
|
|
# (e.g. bz2, gz) and fall back to plain text format.
|
|
def find_and_open_compressed_url(base_url)
|
|
Rails.logger.debug "Looking for files at URL #{base_url} with different compressions"
|
|
for suffix in ['.bz2', '.gz', '']
|
|
begin
|
|
begin
|
|
url = "#{base_url}#{suffix}"
|
|
Rails.logger.debug "Checking if file at #{url} is available"
|
|
file = open(url)
|
|
rescue OpenURI::HTTPError => e
|
|
Rails.logger.debug "Loading #{url} lead to error #{e}. skipping."
|
|
next
|
|
end
|
|
|
|
# Decompress file depending on its filename suffix
|
|
case suffix
|
|
when '.bz2'
|
|
file = Bzip2::Reader.new(file)
|
|
when '.gz'
|
|
file = Zlib::GzipReader.new(file)
|
|
end
|
|
Rails.logger.debug "File containing translations is: #{file}"
|
|
|
|
return file
|
|
rescue Errno::ENOENT
|
|
Rails.logger.error "URL #{url} could not be opened. Skipping."
|
|
end
|
|
end
|
|
end
|
|
|
|
# Try to load the Packages file for a certain component (e.g. "main")
|
|
# and architecture (e.g. "amd64")
|
|
def packages(component, architecture)
|
|
# create path like "main/binary-amd64/Packages"
|
|
packages_path = "#{@dist_url}/#{component}/binary-#{architecture}/Packages"
|
|
Rails.logger.debug "Loading packages from #{packages_path}"
|
|
file = find_and_open_compressed_url(packages_path)
|
|
return get_paragraphs(file)
|
|
end # def packages
|
|
|
|
end # class Release
|
|
|
|
private
|
|
|
|
# Gather the fields of a Debian control file section and return them as a hash
|
|
def get_fields(data)
|
|
fields = {}
|
|
|
|
name=value=''
|
|
data.each_line do |line|
|
|
case line
|
|
when /^(.+): (.+)/ # "Key: Value"
|
|
fields[name.to_sym]=value unless value.empty?
|
|
name,value=$1,$2
|
|
when /^(.+):$/ # "Key:" (start of multi-line entry without value in line)
|
|
fields[name.to_sym]=value unless value.empty?
|
|
name=$1
|
|
value=''
|
|
when /^\s+(.+)/ # " Indented multi-line value"
|
|
# Add a newline for multi-line entries ("Key: Value\n Foo\n Bar")
|
|
unless value.empty?
|
|
value << "\n"
|
|
end
|
|
value << $1
|
|
when /^\s+$/ # Empty line
|
|
break
|
|
end
|
|
end
|
|
# Any lines left at the end of the input?
|
|
fields[name.to_sym]=value unless value.empty?
|
|
|
|
return fields
|
|
end
|
|
|
|
# Iterator that splits up the input of a debian control file
|
|
# by empty lines. For example Debian "Packages" files consist
|
|
# of one paragraph for each package listed in it.
|
|
def get_paragraphs(data)
|
|
Enumerator.new do |enum|
|
|
|
|
gathered_lines = '' # collects all lines belonging to a field
|
|
data.each_line do |line|
|
|
if line.chomp.empty? # empty line found that seperates paragraphs
|
|
unless gathered_lines.empty? # any lines gathered so far?
|
|
enum.yield get_fields(gathered_lines)
|
|
gathered_lines = ''
|
|
end
|
|
else
|
|
gathered_lines << line
|
|
end
|
|
end # each_line
|
|
|
|
# Any lines left after the last empty line and the end of the input?
|
|
unless gathered_lines.empty?
|
|
enum.yield get_fields(gathered_lines)
|
|
end
|
|
end # Enumerator
|
|
end # def
|
|
|
|
end # module
|