mirror of
https://github.com/chromebrew/chromebrew.git
synced 2026-01-08 23:18:10 -05:00
bd02980d15
* Create deb_utils.rb * Update crew * Update core.rb * Update const.rb * Update deb_utils.rb * Wrap as a module Co-authored-by: Ed Reel <edreel@gmail.com>
50 lines
2.1 KiB
Ruby
50 lines
2.1 KiB
Ruby
module DebUtils
|
|
def self.extract_deb(file, target)
|
|
# extract_deb: unarchive .deb files
|
|
# Usage: extract_deb(<file>, <target (optional)>)
|
|
# file: a .deb archive file
|
|
# target: (optional) a specified file to extract from archive, should be passed in regex or string
|
|
#
|
|
# Example:
|
|
# extract_deb('example.deb', 'test.txt') # extract `test.txt` from example.deb
|
|
# extract_deb('example.deb', /data\..*/) # extract files from example.deb with filenames matching the /data\..*/ regex
|
|
# extract_deb('example.deb', /*/) # extract all files from example.deb
|
|
#
|
|
file_found = false
|
|
src_fileIO = File.open(file, 'rb')
|
|
# get first line of the given file, should be a signature string (`!<arch>\n`) if it is a valid deb file
|
|
signature = src_fileIO.gets
|
|
|
|
abort 'Malformed archive :/' unless signature == "!<arch>\n"
|
|
|
|
# process each file in archive
|
|
while (line = src_fileIO.gets) do
|
|
# read file meta
|
|
name, modtime, uid, gid, mode, size, end_char = \
|
|
line.scan(/(.{16})(.{12})(.{6})(.{6})(.{8})(.{10})(.{1})/).flatten.map(&:strip)
|
|
|
|
# check ending byte
|
|
abort "Malformed archive :/" unless end_char == '`'
|
|
|
|
# capture file in archive with given offset bytes (file size)
|
|
fileContent = src_fileIO.read(size.to_i)
|
|
|
|
# filter filename if a target file is specified
|
|
if target.is_a?(String) and name == target
|
|
# if target is passed as string, write matched file to filesyetem and exit function
|
|
# write to filesystem
|
|
File.open(name, 'wb') {|dst_fileIO| dst_fileIO.write(fileContent) }
|
|
# exit function
|
|
return true
|
|
elsif target.is_a?(Regexp) and name =~ target
|
|
# if target is passed as regex, write matched file to filesyetem and continue
|
|
# searching for another matched file until EOF
|
|
# write to filesystem
|
|
File.open(name, 'wb') {|dst_fileIO| dst_fileIO.write(fileContent) }
|
|
file_found = true
|
|
end
|
|
end
|
|
abort "Target #{target.inspect} not found in archive. :/".lightred unless file_found
|
|
end
|
|
end
|