# ### tarfile 压缩模块 后缀为.tar  |  .tar.gz  |   .tar.bz2
import tarfile

tarfile在win中功能不全，肾用，熬夜bug



# ### 1.创建tar压缩包 [官方: 理论上可以压缩到最小的模式是bz2]
# (1) 创建压缩包
""".tar的压缩包,只打包不压缩 276480"""  
tf = tarfile.open("ceshi1029.tar","w",encoding="utf-8")
# (2) 写入文件到压缩包中
tf.add("/bin/ntfscmp","ntfscmp")
tf.add("/bin/openvt","openvt")
tf.add("/bin/grep","tmp/grep")
# (3) 关闭压缩包
tf.close()

# 2.创建.tar.gz压缩包 120462
tf = tarfile.open("ceshi1030.tar.gz","w:gz",encoding="utf-8")
tf.add("/bin/ntfscmp","ntfscmp")
tf.add("/bin/openvt","openvt")
tf.add("/bin/grep","tmp/grep")
tf.close()

# 3.创建.tar.bz2压缩包 115728
tf = tarfile.open("ceshi1031.tar.bz2","w:bz2",encoding="utf-8")
tf.add("/bin/ntfscmp","ntfscmp")
tf.add("/bin/openvt","openvt")
tf.add("/bin/grep","tmp/grep")
tf.close()

# ### 2.解压压缩包
tf = tarfile.open("ceshi1030.tar.gz","r",encoding="utf-8")
# extract(文件,路径)
# tf.extract("ntfscmp","ceshi1030")
# extractall(路径)
tf.extractall("ceshi1030")
tf.close()

# ### 3.追加文件 支持with语法
with  tarfile.open("ceshi1029.tar","a",encoding="utf-8") as tf :
   tf.add("/bin/gzip","gzip")

# error tarfile中的追加,只能是对只打包不压缩的包进行追加,其他的模式不可以;
"""
with tarfile.open("ceshi1031.tar.bz2","a",encoding="utf-8") as tf:
   tf.add("/bin/gzip","gzip")
"""

# ### 4.查看压缩包中的内容
with  tarfile.open("ceshi1029.tar","r",encoding="utf-8") as tf :
   lst = tf.getnames()
   print(lst)


# ### 如何解决tarfile中存在的缺陷?(不能追加文件到已经压缩的包)
"""
(1) 先解压所有文件到文件夹
(2) 把想要追加的内容复制到文件夹中
(3) 经过过滤筛选,重新打包压缩
"""
import os
# 获取当前脚本所在的路径
pathvar = os.getcwd()
# print(res) # /mnt/hgfs/gongxiang8/day16

# 压缩包路径
path1 = os.path.join(pathvar,"ceshi1031.tar.bz2")
print(path1)
# 解压的路径
path2 = os.path.join(pathvar,"ceshi1031")

# (1) 先解压所有文件到文件夹
with tarfile.open( path1 , "r",encoding="utf-8") as tf:
   tf.extractall(path2)

# (2) 把想要追加的内容复制到文件夹中
mybin = "cp -a /bin/ip " + path2 # cp -a /bin/ip /mnt/hgfs/gongxiang8/day16/ceshi1031
os.system(mybin)

# (3) 经过过滤筛选,重新打包压缩
lst = os.listdir(path2)
print(lst)

with tarfile.open(path1,"w:bz2",encoding="utf-8") as tf:
   for i in lst:
      if i != "openvt":
         # 拼接绝对路径
         pathnew = os.path.join(path2,i)
         # add(路径,别名)
         tf.add(pathnew,i)

ubuntu 中导 tarfile，win 不亲切