Python tutorial in example 10.4 backup script code Introduction

The python tutorial in example 10.4 backs up the script-version 4 code is quite long, so many people feel helpless, but you have a better understanding of it through the following code, the following is a detailed description of the relevant content. I hope you will gain some benefits.

 
 

  
  
#!/usr/bin/python  
  
  
# Filename: backup_ver4.py  
  
  
import os  
  
  
import time  
  
  
# 1. The files and directories to be backed up are 
specified in a list.  
  
  
source = [‘/home/swaroop/byte’, ‘/home/swaroop/bin’]  
  
  
# If you are using Windows, use source =
 [r'C:\Documents'
, r'D:\Work'] or something like that  
  
  
# 2. The backup must be stored in a main backup
 directory  
  
  
target_dir = ‘/mnt/e/backup/’ # Remember to change 
this to what you will be using  
  
  
# 3. The files are backed up into a zip file.  
  
  
# 4. The current day is the name of the 
subdirectory in the main directory  
  
  
today = target_dir + time.strftime(‘%Y%m%d’)  
  
  
# The current time is the name of the zip archive  
  
  
now = time.strftime(‘%H%M%S’)  
  
  
# Take a comment from the user to create the name 
of the zip file  
  
  
comment = raw_input(‘Enter a comment –> ‘)  
  
  
if len(comment) == 0: # check if a comment was entered  
  
  
target = today + os.sep + now + ‘.zip’  
  
  
else:  
  
  
target = today + os.sep + now + ‘_’ + \  
  
  
comment.replace(‘ ‘, ‘_’) + ‘.zip’  
  
  
# Notice the backslash!  
  
  
# Create the subdirectory if it isn’t already there  
  
  
if not os.path.exists(today):  
  
  
os.mkdir(today) # make directory  
  
  
print ‘Successfully created directory’, today  
  
  
# 5. We use the zip command (in Unix/Linux) to put the 
files in a zip archive  
  
  
zip_command = "zip -qr ‘%s’ %s" % (target, ‘ 
‘.join(source))  
  
  
# Run the backup  
  
  
if os.system(zip_command) == 0:  
  
  
print ‘Successful backup to’, target  
  
  
else:  
  
  
print ‘Backup FAILED’ 
 
 

As mentioned in the article, "I also want to use the tar command to replace the zip command. One advantage of this is that when you use the tar and gzip commands in combination, backup will be faster and smaller. If you want to use this document in windows, winzipcan easily process these .tar.gz files. The tar command is available by default in most Linux/Unix systems. Windows users can also download and install it. The command string will now be:

 
 

  
  
tar = ‘tar -cvzf %s %s -X /home/swaroop/
excludes.txt’ % (target, ‘ ‘.join(srcdir)) 
 
 

It must be supplemented that the command after installing LibArchive for Windows users is bsdtar. To use the-z option, you must also install the gzip software. In the code

 
 

  
  
target = today + os.sep + now + ‘.zip’ 
 
 

Change

 
 

  
  
target = today + os.sep + now + ‘.tar.gz’ 
 
 

Use

 
 

  
  
bsdtar -cvzf %s %s -X /home/swaroop/
excludes.txt’ % (target, ‘ ‘.join(source)) 
 
 

The above content is a detailed description of some notes in the simple python tutorial, such as the 10.4 backup script-version 4 code.