Pack DEB package by using Python

1. sudo apt-get install python-stdeb devscripts python-all-dev
2. sudo pip install -U stdeb
3. python setup.py --command-packages=stdeb.command bdist_deb
4. The *.deb , *.tar.gz , *.dsc will be generated under deb_dist/ directory.

PS. If I have my own debian/*.postinst , debian/*.postrm , ...etc.
      I need to add the file into MANIFEST.in in the same level directory with setup.py .
      Such as:
        $ echo "include debian/*" >> MANIFEST.in

Reference:
https://wiki.debian.org/Python/Packaging

Using Exiftool to shift datetime

1. Download the command line tool: exiftool
    ( http://www.sno.phy.queensu.ca/~phil/exiftool/ )
2.  Change all datetime tags in exif to add 1 year 2 month 3 day 4 hour 5 min 6 sec, and also overwite the original file
    >> exif tool "-AllDates+=1:2:3 4:5:6" -overwrite_original DIR_PATH
3. Finish

Python, Parse key, value pair without section

import StringIO
import ConfigParser

ini_path = "key_value_file_name"
ini_str = '[fakesection]\n' + open(ini_path).read()
ini_fp = StringIO.StringIO(ini_str)
config = ConfigParser.RawConfigParser()
config.readfp(ini_fp)
print config.items('fakesection')

Use Services For UNIX to Install NFS Server in Windows

1. Download "Windows Services for UNIX" Version 3.5
    (SFU35EL_EN.exe)
2. Execute SFU35EL_EN.exe to unzip the file.
3. Execute the unzipped "Setup.exe" to install the NFS Server.
4. Use "Custom Install" selection
5. Only select "Server for NFS" and "Server for NFS Authentication"
    (It will also install "User Name Mapping)
6. After installation, it will start the service "Server for NFS".
    If not, goto services to start it.
7. Setting the "User Name Mapping", select "Use Password and Group files" item.
    And then select the path of "passwd" and "group"
    This two file's sample can be show as:
      passwd:
        root:x:0:0:root:/root:/bin/bash
      group:
        root:x:0:
8. After setting need to press "Apply" button.
9. Open "File Manager" to the share folder, press right button to setting "NFS Sharing".
    Select "Share this folder".
10. In Linux platform, use "mount" command with NFS version 3 option to mount it.
    >> sudo mount -v -t nfs -o nfsvers=3 IP:/folder/path /mount/path
11. After using the NFS data, want to un-mount the folder
    >> sudo umount /mount/path

Set child folder's default permission the same as parenet folder's permission

Use ACL module and set sgid

1. sudo apt-get install acl
2. Modify /etc/fstab set the option "acl" to the mounted file system
    ex. /dev/sda1 / ext4 errors=remount-ro,acl 0 1
3. Remount the mount point
    >> sudo mount -o remount /
4. Set the ACL for the folder
    >> setfacl -dm u::rwx,g::rwx,o::r /home/folder/path
5. Set sgid for the folder
    >> chmod g+s /home/folder/path
6. It's OK

Calculate CRC32 in Python

Use binascii library with crc32 function to calculate CRC32.
import binascii def computeFileCRC(filename): try: blocksize = 1024 * 64 f = open(filename, "rb") str = f.read(blocksize) crc = 0 while len(str) != 0: crc = binascii.crc32(str,crc) & 0xffffffff str = f.read(blocksize) f.close() except: print "compute file crc failed!" return 0 return crc