Jacky's Treasure Box

2016年9月30日星期五

Changing Unity 3D to Unity 2D

Changing default behavior to unity 2D when login needs to follow the steps below

Install the deb package sudo apt-get install unity-2d
rm /usr/share/xsessions/ubuntu.desktop (You can rename it if you want unity 3d)
/bin/sed -i "/Session*/c Session=gnome-fallback-compiz" /var/cache/lightdm/dmrc/*.dmrc (Change the default session to gnome-fallback-compiz)
Restart your machine and the default UI of Ubuntu will become Unity 2D

References

http://askubuntu.com/questions/62833/how-do-i-change-the-default-session-for-when-using-auto-logins
https://wiki.ubuntu.com/LightDM
https://ubuntuforums.org/showthread.php?t=2245261
http://askubuntu.com/questions/456766/how-to-set-default-session-in-ubuntu-14-04-lts

Environment

Ubuntu 14.04

2016年9月16日星期五

Wordpress Mail Function - Points to Note

When dealing with smtp sending email, we may encounter situations that despite all the settings are correct, email still cannot be sent successfully, this is due to the google account setting, if you also encounter similar issues, go to Goggle > My Account > turn "Allow less secure apps" to "ON".

2016年5月20日星期五

Installing VMWare Player in Ubuntu 32 bit

Struggled in VMWare player installed in Ubuntu 14.04 32 bit, the below solution helps.

Basically, the error message is related to vmnet module, like the following

Using 2.6.x kernel build system.

make: Entering directory `/tmp/modconfig-c7FgGQ/vmmon-only'

/usr/bin/make -C /lib/modules/3.16.0-71-generic/build/include/.. SUBDIRS=$PWD SRCROOT=$PWD/. \

MODULEBUILDDIR= modules

make[1]: Entering directory `/usr/src/linux-headers-3.16.0-71-generic'

CC [M] /tmp/modconfig-c7FgGQ/vmmon-only/linux/driver.o

CC [M] /tmp/modconfig-c7FgGQ/vmmon-only/linux/driverLog.o

CC [M] /tmp/modconfig-c7FgGQ/vmmon-only/linux/hostif.o

CC [M] /tmp/modconfig-c7FgGQ/vmmon-only/common/apic.o

CC [M] /tmp/modconfig-c7FgGQ/vmmon-only/common/comport.o

In file included from /tmp/modconfig-c7FgGQ/vmmon-only/linux/driverLog.h:33:0,

from /tmp/modconfig-c7FgGQ/vmmon-only/linux/driverLog.c:31:

/tmp/modconfig-c7FgGQ/vmmon-only/./include/vm_assert.h:259:0: warning: "DEPRECATED" redefined [enabled by default]

#define DEPRECATED(_fix) do {} while (0)

^

In file included from include/linux/kernel.h:13:0,

from /tmp/modconfig-c7FgGQ/vmmon-only/./include/compat_kernel.h:23,

from /tmp/modconfig-c7FgGQ/vmmon-only/linux/driverLog.c:27:

include/linux/printk.h:106:0: note: this is the location of the previous definition

#define DEPRECATED "[Deprecated]: "

^

CC [M] /tmp/modconfig-c7FgGQ/vmmon-only/common/cpuid.o

In file included from /tmp/modconfig-c7FgGQ/vmmon-only/./include/vmware.h:39:0,

from /tmp/modconfig-c7FgGQ/vmmon-only/linux/driver.c:46:

/tmp/modconfig-c7FgGQ/vmmon-only/./include/vm_assert.h:259:0: warning: "DEPRECATED" redefined [enabled by default]

#define DEPRECATED(_fix) do {} while (0)

^

In file included from include/linux/kernel.h:13:0,

from ./arch/x86/include/asm/percpu.h:44,

from ./arch/x86/include/asm/preempt.h:5,

from include/linux/preempt.h:18,

from include/linux/spinlock.h:50,

from include/linux/wait.h:8,

from include/linux/fs.h:6,

from include/linux/highmem.h:4,

from /tmp/modconfig-c7FgGQ/vmmon-only/linux/driver.c:25:

include/linux/printk.h:106:0: note: this is the location of the previous definition

#define DEPRECATED "[Deprecated]: "

^

In file included from /tmp/modconfig-c7FgGQ/vmmon-only/./include/vmware.h:39:0,

from /tmp/modconfig-c7FgGQ/vmmon-only/linux/hostif.c:82:

/tmp/modconfig-c7FgGQ/vmmon-only/./include/vm_assert.h:259:0: warning: "DEPRECATED" redefined [enabled by default]

#define DEPRECATED(_fix) do {} while (0)

^

In file included from include/linux/kernel.h:13:0,

from include/asm-generic/bug.h:13,

from ./arch/x86/include/asm/bug.h:35,

from include/linux/bug.h:4,

from include/linux/mmdebug.h:4,

from include/linux/mm.h:8,

from /tmp/modconfig-c7FgGQ/vmmon-only/./include/compat_page.h:23,

from /tmp/modconfig-c7FgGQ/vmmon-only/linux/hostif.c:32:

include/linux/printk.h:106:0: note: this is the location of the previous definition

#define DEPRECATED "[Deprecated]: "

^

CC [M] /tmp/modconfig-c7FgGQ/vmmon-only/common/hashFunc.o

/tmp/modconfig-c7FgGQ/vmmon-only/linux/driver.c:1342:1: warning: always_inline function might not be inlinable [-Wattributes]

LinuxDriverSyncReadTSCs(uint64 *delta) // OUT: TSC max - TSC min

^

CC [M] /tmp/modconfig-c7FgGQ/vmmon-only/common/memtrack.o

CC [M] /tmp/modconfig-c7FgGQ/vmmon-only/common/phystrack.o

CC [M] /tmp/modconfig-c7FgGQ/vmmon-only/common/task.o

CC [M] /tmp/modconfig-c7FgGQ/vmmon-only/common/vmx86.o

In file included from /tmp/modconfig-c7FgGQ/vmmon-only/./include/vmware.h:39:0,

from /tmp/modconfig-c7FgGQ/vmmon-only/common/vmx86.c:40:

/tmp/modconfig-c7FgGQ/vmmon-only/./include/vm_assert.h:259:0: warning: "DEPRECATED" redefined [enabled by default]

#define DEPRECATED(_fix) do {} while (0)

^

In file included from include/linux/kernel.h:13:0,

from include/linux/sched.h:17,

from /tmp/modconfig-c7FgGQ/vmmon-only/common/vmx86.c:31:

include/linux/printk.h:106:0: note: this is the location of the previous definition

#define DEPRECATED "[Deprecated]: "

^

CC [M] /tmp/modconfig-c7FgGQ/vmmon-only/vmcore/moduleloop.o

In file included from /tmp/modconfig-c7FgGQ/vmmon-only/./include/vmware.h:39:0,

from /tmp/modconfig-c7FgGQ/vmmon-only/linux/driver.c:46:

/tmp/modconfig-c7FgGQ/vmmon-only/./include/vm_assert.h:259:0: warning: "DEPRECATED" redefined [enabled by default]

#define DEPRECATED(_fix) do {} while (0)

^

In file included from include/linux/kernel.h:13:0,

from ./arch/x86/include/asm/percpu.h:44,

from ./arch/x86/include/asm/preempt.h:5,

from include/linux/preempt.h:18,

from include/linux/spinlock.h:50,

from include/linux/wait.h:8,

from include/linux/fs.h:6,

from include/linux/highmem.h:4,

from /tmp/modconfig-c7FgGQ/vmmon-only/linux/driver.c:25:

include/linux/printk.h:106:0: note: this is the location of the previous definition

#define DEPRECATED "[Deprecated]: "

^

In file included from /tmp/modconfig-c7FgGQ/vmmon-only/./include/vmware.h:39:0,

from /tmp/modconfig-c7FgGQ/vmmon-only/vmcore/moduleloop.c:33:

/tmp/modconfig-c7FgGQ/vmmon-only/./include/vm_assert.h:259:0: warning: "DEPRECATED" redefined [enabled by default]

#define DEPRECATED(_fix) do {} while (0)

^

In file included from include/linux/kernel.h:13:0,

from /tmp/modconfig-c7FgGQ/vmmon-only/vmcore/moduleloop.c:30:

include/linux/printk.h:106:0: note: this is the location of the previous definition

#define DEPRECATED "[Deprecated]: "

^

LD [M] /tmp/modconfig-c7FgGQ/vmmon-only/vmmon.o

Building modules, stage 2.

MODPOST 1 modules

CC /tmp/modconfig-c7FgGQ/vmmon-only/vmmon.mod.o

LD [M] /tmp/modconfig-c7FgGQ/vmmon-only/vmmon.ko

make[1]: Leaving directory `/usr/src/linux-headers-3.16.0-71-generic'

/usr/bin/make -C $PWD SRCROOT=$PWD/. \

MODULEBUILDDIR= postbuild

make[1]: Entering directory `/tmp/modconfig-c7FgGQ/vmmon-only'

make[1]: `postbuild' is up to date.

make[1]: Leaving directory `/tmp/modconfig-c7FgGQ/vmmon-only'

cp -f vmmon.ko ./../vmmon.o

make: Leaving directory `/tmp/modconfig-c7FgGQ/vmmon-only'

Using 2.6.x kernel build system.

make: Entering directory `/tmp/modconfig-c7FgGQ/vmnet-only'

/usr/bin/make -C /lib/modules/3.16.0-71-generic/build/include/.. SUBDIRS=$PWD SRCROOT=$PWD/. \

MODULEBUILDDIR= modules

make[1]: Entering directory `/usr/src/linux-headers-3.16.0-71-generic'

CC [M] /tmp/modconfig-c7FgGQ/vmnet-only/driver.o

CC [M] /tmp/modconfig-c7FgGQ/vmnet-only/hub.o

CC [M] /tmp/modconfig-c7FgGQ/vmnet-only/userif.o

CC [M] /tmp/modconfig-c7FgGQ/vmnet-only/netif.o

In file included from /tmp/modconfig-c7FgGQ/vmnet-only/monitorAction_exported.h:31:0,

from /tmp/modconfig-c7FgGQ/vmnet-only/vnet.h:29,

from /tmp/modconfig-c7FgGQ/vmnet-only/vnetInt.h:24,

from /tmp/modconfig-c7FgGQ/vmnet-only/hub.c:43:

/tmp/modconfig-c7FgGQ/vmnet-only/vm_assert.h:259:0: warning: "DEPRECATED" redefined [enabled by default]

#define DEPRECATED(_fix) do {} while (0)

^

In file included from include/linux/kernel.h:13:0,

from /tmp/modconfig-c7FgGQ/vmnet-only/hub.c:23:

include/linux/printk.h:106:0: note: this is the location of the previous definition

#define DEPRECATED "[Deprecated]: "

^

In file included from /tmp/modconfig-c7FgGQ/vmnet-only/monitorAction_exported.h:31:0,

from /tmp/modconfig-c7FgGQ/vmnet-only/vnet.h:29,

from /tmp/modconfig-c7FgGQ/vmnet-only/vnetInt.h:24,

from /tmp/modconfig-c7FgGQ/vmnet-only/userif.c:45:

/tmp/modconfig-c7FgGQ/vmnet-only/vm_assert.h:259:0: warning: "DEPRECATED" redefined [enabled by default]

#define DEPRECATED(_fix) do {} while (0)

^

In file included from include/linux/kernel.h:13:0,

from ./arch/x86/include/asm/percpu.h:44,

from ./arch/x86/include/asm/preempt.h:5,

from include/linux/preempt.h:18,

from include/linux/spinlock.h:50,

from include/linux/wait.h:8,

from include/linux/fs.h:6,

from include/linux/highmem.h:4,

from /tmp/modconfig-c7FgGQ/vmnet-only/userif.c:26:

include/linux/printk.h:106:0: note: this is the location of the previous definition

#define DEPRECATED "[Deprecated]: "

^

/tmp/modconfig-c7FgGQ/vmnet-only/hub.c: In function ‘VNetHubFindHubByID’:

/tmp/modconfig-c7FgGQ/vmnet-only/hub.c:132:49: warning: argument to ‘sizeof’ in ‘__builtin_memcmp’ call is the same expression as the first source; did you mean to provide an explicit length? [-Wsizeof-pointer-memaccess]

memcmp(idNum, currHub->id.pvnID, sizeof idNum))) {

^

In file included from ./arch/x86/include/asm/string.h:2:0,

from include/linux/string.h:17,

from ./arch/x86/include/asm/page_32.h:34,

from ./arch/x86/include/asm/page.h:13,

from ./arch/x86/include/asm/thread_info.h:11,

from include/linux/thread_info.h:54,

from ./arch/x86/include/asm/preempt.h:6,

from include/linux/preempt.h:18,

from include/linux/spinlock.h:50,

from include/linux/seqlock.h:35,

from include/linux/time.h:5,

from include/uapi/linux/timex.h:56,

from include/linux/timex.h:56,

from include/linux/sched.h:19,

from /tmp/modconfig-c7FgGQ/vmnet-only/hub.c:25:

/tmp/modconfig-c7FgGQ/vmnet-only/hub.c: In function ‘VNetHubAlloc’:

/tmp/modconfig-c7FgGQ/vmnet-only/hub.c:315:36: warning: argument to ‘sizeof’ in ‘__builtin_memcpy’ call is the same pointer type ‘uint8 *’ as the destination; expected ‘uint8’ or an explicit length [-Wsizeof-pointer-memaccess]

memcpy(hub->id.pvnID, id, sizeof id);

^

./arch/x86/include/asm/string_32.h:182:48: note: in definition of macro ‘memcpy’

#define memcpy(t, f, n) __builtin_memcpy(t, f, n)

^

In file included from /tmp/modconfig-c7FgGQ/vmnet-only/monitorAction_exported.h:31:0,

from /tmp/modconfig-c7FgGQ/vmnet-only/vnet.h:29,

from /tmp/modconfig-c7FgGQ/vmnet-only/vnetInt.h:24,

from /tmp/modconfig-c7FgGQ/vmnet-only/netif.c:42:

/tmp/modconfig-c7FgGQ/vmnet-only/vm_assert.h:259:0: warning: "DEPRECATED" redefined [enabled by default]

#define DEPRECATED(_fix) do {} while (0)

^

In file included from include/linux/kernel.h:13:0,

from /tmp/modconfig-c7FgGQ/vmnet-only/netif.c:23:

include/linux/printk.h:106:0: note: this is the location of the previous definition

#define DEPRECATED "[Deprecated]: "

^

/tmp/modconfig-c7FgGQ/vmnet-only/netif.c: In function ‘VNetNetIf_Create’:

/tmp/modconfig-c7FgGQ/vmnet-only/netif.c:151:79: error: macro "alloc_netdev" passed 4 arguments, but takes just 3

dev = alloc_netdev(sizeof *netIf, deviceName, NET_NAME_USER, VNetNetIfSetup);

^

/tmp/modconfig-c7FgGQ/vmnet-only/netif.c:151:10: error: ‘alloc_netdev’ undeclared (first use in this function)

dev = alloc_netdev(sizeof *netIf, deviceName, NET_NAME_USER, VNetNetIfSetup);

^

/tmp/modconfig-c7FgGQ/vmnet-only/netif.c:151:10: note: each undeclared identifier is reported only once for each function it appears in

/tmp/modconfig-c7FgGQ/vmnet-only/netif.c: At top level:

/tmp/modconfig-c7FgGQ/vmnet-only/netif.c:85:1: warning: ‘VNetNetIfSetup’ defined but not used [-Wunused-function]

VNetNetIfSetup(struct net_device *dev) // IN:

^

make[2]: *** [/tmp/modconfig-c7FgGQ/vmnet-only/netif.o] Error 1

make[2]: *** Waiting for unfinished jobs....

In file included from /tmp/modconfig-c7FgGQ/vmnet-only/monitorAction_exported.h:31:0,

from /tmp/modconfig-c7FgGQ/vmnet-only/vnet.h:29,

from /tmp/modconfig-c7FgGQ/vmnet-only/vnetInt.h:24,

from /tmp/modconfig-c7FgGQ/vmnet-only/driver.c:51:

/tmp/modconfig-c7FgGQ/vmnet-only/vm_assert.h:259:0: warning: "DEPRECATED" redefined [enabled by default]

#define DEPRECATED(_fix) do {} while (0)

^

In file included from include/linux/kernel.h:13:0,

from /tmp/modconfig-c7FgGQ/vmnet-only/driver.c:23:

include/linux/printk.h:106:0: note: this is the location of the previous definition

#define DEPRECATED "[Deprecated]: "

^

make[1]: *** [_module_/tmp/modconfig-c7FgGQ/vmnet-only] Error 2

make[1]: Leaving directory `/usr/src/linux-headers-3.16.0-71-generic'

make: *** [vmnet.ko] Error 2

make: Leaving directory `/tmp/modconfig-c7FgGQ/vmnet-only'

Unable to install all modules. See log for details.

Seems that vmware is not able to compile the network module under kernel 3.16, so we need to apply this patch

http://askubuntu.com/questions/449629/error-installing-vmware-workstation-on-ubuntu/449630#449630?newreg=0be708f4a9c0411d973eb3035b176d69

Details of the patch will be analyzed later

After patching the vmware, just start the vmware player as usual and install the module

2016年4月23日星期六

Backup and Restore of MongoDB

In MySQL world, we can backup and restore our database pretty easy via phpmyadmin or mysqldump etc. But in mongoDB, it is even easier! Just running 2 commands in total, one for backup and one for restore, and you can seamlessly transfer your mongoDB data to the new machine.

In my case, I try to transfer the DB data from my old raspberry gen1 to my new raspberry pi 3, of course, it works on all sorts of Linux platform and Windows also.

First, to backup your DB, run

mongodump --db myDB --out destPath

This is the simplest backup method, of course, mongodump provides many options for customization, but in most situation, this would be enough. If you want to backup all the databases, do not specify --db.

Then you just copy the dumped mongoDB file to the desired location and run

mongorestore --db myDB --drop /data/db

/data/db is my designated path, you can have it yourself, after that, all the data will be restored! Easy right? Remember --drop parameter is important as changes in the database will not be restored if not specified.

Update: 19-6-2016
Remember, the restore path is always the relative path of the current directory, i.e. Say

mongorestore --drop -d db abc/

"abc" is a RELATIVE directory of the current shell

Reference:

http://stackoverflow.com/questions/3884418/mongorestore-of-a-db-causing-me-trouble
https://docs.mongodb.org/manual/reference/program/mongodump/#bin.mongodump
https://docs.mongodb.org/manual/reference/program/mongorestore/

2015年5月25日星期一

Setup VCS Using Redmine + Git

We all know that Git is a very good VCS, with redmine, like Bugzilla, we have even better control and graphical view on our repository, and this is undoubtedly aid development. The following is how to make the whole VCS system happens.

What we need
1) Git (of course!)
2) Redmine
3) Apache Server

Procedure
1) Install all the necessary components respectively
sudo apt-get install apache2
sudo apt-get install mysql-server
sudo apt-get install redmine-mysql
sudo apt-get install libapache2-mod-passenger
sudo apt-get install redmine
sudo apt-get install git-core

2) Set up soft link from redmine source to the Apache source
sudo ln -s /usr/share/redmine/public /var/www/redmine

3) mod passenger needs www-data to execute, add the following to /etc/apache2/mods-available/passenger.conf

vi /etc/apache2/mods-available/passenger.conf

PassengerDefaultUser www-data

4) Add redmine's web directory to Apache2's sites-available/default

RailsBaseURI /redmine
PassengerAppRoot /usr/share/redmine
RailsEnv production
PassengerResolveSymlinksInDocumentRoot on

5) Setup plugin linkage
ln -s /var/cache/redmine/default/plugin_assets /usr/share/redmine/public/

6) Create new repository (server side), note that the directory should be with owner "www-data"

cd /var/www

mkdir test-repo.git

cd test-repo.git

git --bare init

git update-server-info

chown -R www-data.www-data .

7) Enable webDAV
a2enmod dav_fs
a2enmod dav

If high security is required, carry on, if not, restart apache and all services will be done

8) Create the following file
/etc/apache2/conf.d/git.conf

9) Configure the repository path for authentication

DAV on

AuthType Basic

AuthName "Git"

AuthUserFile /etc/apache2/passwd.git

Require valid-user

10) Create user which can access the repository
htpasswd -c /etc/apache2/passwd.git

11) Restart Apache service
/etc/init.d/apache2 restart

Done! You have made a git VCS with redmine geared!

Almost forgot, modifying the config file in .git directory is necessary for authentication when pushing

[remote "origin"]

fetch = +refs/heads/*:refs/remotes/origin/*

url = http://username:password@git.repository.url/repo.git

References:
- Linking git remote server to Apache
http://blog.bobbyallen.me/2012/07/23/installing-a-git-server-using-apache-webdav-on-ubuntu-server-12-04/

- Installing Apache + Git + Redmine
http://blog.chiichen.com/2014/05/raspberry-pi-redmine.html

- Git config fix on http/https authentication
http://stackoverflow.com/questions/5264949/cannot-push-git-to-remote-repository-with-http-https

- Others
https://randomthoughtsgr.wordpress.com/2011/10/17/redmine-sub-uri-and-apache-configuration/

2015年5月12日星期二

cxfreeze Python program (Linux) - Wrapping the Python Program to Single Executable

I would like to note down here because Googling results frustrating with

Large amount of Windows environment Python application wrapping
Misleading and lack of example of cxfreeze API

But thanks for Stackoverflow, I finally get the solution despite various failure on different problems during the wrapping of my wxPython application.

Here is my situation

I have written a wxpython program, and the program consist of not only .py files but with images and xml files, I want to

Wrap all these stuffs to one executable program in Ubuntu
Deploy this program with deb installer

Solutions

Download and install cxfreeze
Please let me know but I cannot find relative commands on how to include external files, therefore I use the officially provided py script
http://cx-freeze.readthedocs.org/en/latest/script.html
Follow the below official guide and write the setup script to build the program
http://cx-freeze.readthedocs.org/en/latest/distutils.html
Run python setup.py build and your program will be built
Follow the file structure to build the deb

mpstoolbox is the app name, name your own one
DEBIAN/control, DEBIAN/postinst is files to configure the deb package
usr/bin/..., this is the installed path, you should make your own path, all the files installed will follow this path structure
Finally, cd back to the folder (your app name), use dpkg -b yourAppName
A deb package will be generated
Use dpkg -i to install

Here comes the MOST important part, my problem

It seems simple to follow the above to build the program, but indeed it doesn't, the guide does not teach you clearly on how to include the required modules to let you bring your program to other Linux machine to run, you need to follow the followings

binpathincludes parameter is important, please include all system library like /usr/lib, /usr/local/lib, or you may encounter this error libwx_gtk2u import error, ImportError: libwx_gtk2u_adv-2.8 etc. This is deal to the missing of wxPython library, you therefore need to include all required system library when building the app
About the setup.py, the api is not very clear in cxfreeze, follow stackoverflow's guide, thanks to the bro there, he also suffered from the lack of clearance of the api
http://stackoverflow.com/questions/15486292/cx-freeze-doesnt-find-all-dependencies

One thing here to pay attention to, the "include_files" attribute should be a list of tuples instead of single name only!! Your external files and other required images should also put it here.

Finally, the following are the sample files
DEBIAN control, postint file programming tutorial
http://www.leaseweblabs.com/2013/06/creating-custom-debian-packages/

Basically, the postint script is just like the bash script you normally write, follow the rules used in bash and it will be run after install

DEBIAN control file format
https://drive.google.com/file/d/0BzjkM5qIfmJmTGNuRkxKamZtaWc/view?usp=sharing

cxfreeze setup.py format
https://drive.google.com/file/d/0BzjkM5qIfmJmWTRLOHdXVU9rdFE/view?usp=sharing

Making the desktop shortcut
http://stackoverflow.com/questions/30185505/running-a-packaged-python-program-in-ubuntu

2015年2月1日星期日

[VLC] Solving Gibberish Subtitles when Using VLC

Make sure the sub file is in utf-8 or unicode
Navigate to VLC>Tools>Reference>Subtitle/OSD
Change the "Default Encoding" to uft-8 and the font to "Microsoft Yahei"
Enjoy the nice sub!

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2016年9月30日 星期五

2016年9月16日 星期五

2016年5月20日 星期五

2016年4月23日 星期六

2015年5月25日 星期一

2015年5月12日 星期二

2015年2月1日 星期日