How to check target architecture of a static library

For Mac OS:
   Use lipo.
   Ex. lipo -info staticLibrary.a

For Linux OS:
   Use file
   Ex. file staticLibrary.c

command for listing all the shared libraries used by an ARM-base executable

. For ARM-base executable, use
arm-none-linux-gnueabi-objdump -x executable_name | grep NEEDED

. For Intel-base executable, use
ldd executable_name

Install Gitosis on CentOS how-to

Source1: http://scie.nti.st/2007/11/14/hosting-git-repositories-the-easy-and-secure-way
Source2: http://wiki.centos.org/HowTos/Network/SecuringSSH

[On server side, login as root]
1. Install gitosis
   cd ~/src
   git clone git://eagain.net/gitosis.git
   cd gitosis
   yum install python-setuptools
   python setup.py install
2. Create a user who will own the repositories you want to manage. Usually called "git".
   useradd git
3. Copy your public key to the server (howard's $HOME/.ssh/ on server)
   [On local machine]
   scp ~/.ssh/id_rsa.pub howard@10.0.0.10:~/.ssh/
      [Create one if you don't have it, on local machine]

      ssh-keygen -t rsa

      . Both public and private key will be stored in ~/.ssh/, name id_rsa.pub and id_rsa
      . Change the permission as following:
         . chmod 700 ~/.ssh
         . chmod 600 ~/.ssh/id_rsa
4. Install public key to the authorized_keys list in order to log on with public/private key instead of password prompt
   [On local machine]
   ssh howard@10.0.0.10 cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
   ssh howard@10.0.0.10 chmod 700 ~/.ssh
   ssh howard@10.0.0.10 chmod 600 ~/.ssh/authorized_keys
   . Now you will be log on to 10.0.0.10 without entering password
5. Init gitosis-admin repository
   . Copy howard's public key to tmp folder in case user "git"cannot access it in howard's $HOME/.ssh
   cp /home/howard/.ssh/id_rsa.pub /tmp
   . Now to init gitosis-admin repository
   sudo -H -u git gitosis-init < /tmp/id_rsa.pub
   chmod 755 /home/git/repositories/gitosis-admin.git/hooks/post-update
6. Change user "git"'s home directory to /home/git/repositories
7. Clone the gitosis-admin repository into your local machine
   [On local machine]
   . Find a place where you would like to create gitosis-admin repository
   git clone ssh://git@10.0.0.10:~/gitosis-admin.git
8. Now you have gitosis.conf file and keydir directory under gitosis-admin repository
   . With these 2 files, you can define access right for every user and all is done locally and push the changes to the server.

Creating new repositories [On local machine]
1. To allow howard creates/writes "ViewerRepo" repository, edit gitosis.conf and add following
   [group team1]
   members = howard
   writable = ViewerRepo
2. Save it and push to remote server
   git commit -a -m "Allow howard write access to ViewerRepo"
   git push
3. Now howard has access to create/write the ViewerRepo. But it's not created yet. let's create it now.
   mkdir ViewerRepo
   cd ViewerRepo
   git init
   git remote add origin git@10.0.0.10:~/ViewerRepo
   // git add and commit files
   git push origin master:refs/heads/master
4. Adding user aaron
   . Simply copy aaron' public keys to gitosis-admin/keydir/, when done, add to git
   git add keydir/aaron.pub
   . Edit gitosis.conf accordingly
   Change "members = howard" to "members = howard aaron"
   . Update the settings to remote server
   git commit -a -m "Granted aaron commit rights to ViewerRepo"
   git push
5. Now aaron can clone the ViewerRepo and working on it
   git clone git@10.0.0.10:~/ViewerRepo

Install Git on CentOS

Source1: http://www.davegardner.me.uk/blog/2010/01/29/setting-up-git-on-centos-5-server/

Source2: http://stackoverflow.com/questions/8059743/trying-to-install-git-on-centos-5-and-a-little-lost

Installing Git on CentOS 5 is easy if you make use of the EPEL (Extra Packages for Enterprise Linux) repository.

1. To setup EPEL all you need to do is create a file /etc/yum.repos.d/epel.repo and then paste in the following:

[epel]
name=Extra Packages for Enterprise Linux 5 - $basearch
#baseurl=http://download.fedoraproject.org/pub/epel/5/$basearch
mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-5&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL

[epel-debuginfo]
name=Extra Packages for Enterprise Linux 5 - $basearch - Debug
#baseurl=http://download.fedoraproject.org/pub/epel/5/$basearch/debug
mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-debug-5&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL
gpgcheck=1

[epel-source]
name=Extra Packages for Enterprise Linux 5 - $basearch - Source
#baseurl=http://download.fedoraproject.org/pub/epel/5/SRPMS
mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-source-5&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL
gpgcheck=1

2. Install GPG Keys


Go into rpm-gpg directory

cd /etc/pki/rpm-gpg/

Download GPG KEYS from https://fedoraproject.org/keys

wget https://fedoraproject.org/static/217521F6.txt

Rename to "217521F6.txt" to "RPM-GPG-KEY-EPEL"

cp 217521F6.txt RPM-GPG-KEY-EPEL

Remove "217521F6.txt" because we don't need in that file anymore

rm 217521F6.txt

If you want you can remove prefix lines from the file by vim and :wq (:Write and Quit)

vim RPM-GPG-KEY-EPEL

3. Installing git git-daemon

yum install git git-daemon

[iOS Developer] How to use TestFlight to distribute your beta app

1. Create an account on TestFlight (http://testflightapp.com) and with "Developer" option checked.
2. Log in to the TestFlight web site and "Add a team" for your app.
3. Add teammates, either testers or developers. (PS. Recruiting testers from public is also available)
4. Ask your teammates to register their iOS devices following the instructions in the Email. (Do it on their iOS devices)
5. Once they accepted to being the teammates and registered their devices, you will be able to see their devices information such as device model, iOS version, and UDID.
6. Add their devices/UDIDs to your Provisioning Portal -> Devices.
7. Modify the Ad-Hoc provisioning profile to include the newly added devices and install the updated provisioning profile to your XCode.
8. Build your app in Ad-Hoc mode and locate the YourAppName.ipa.
   . For XCode 4: http://support.testflightapp.com/kb/tutorials/how-to-create-an-ipa-xcode-4
   . For XCode 3: http://support.testflightapp.com/kb/tutorials/how-to-create-an-ipa-xcode-3
9. Log in to TestFlight web site, click "Upload Build" and follow the instructions to finish uploading the app.
10. Your teammates will be able to install the app you just uploaded to their devices with TestFlight app on their iOS devices.

XCode breakpoint not working

Sometimes the XCode breakpoint becomes not working somehow. To solve this problem, simply restart the iOS device.

Update NVIDIA Graphic card driver for SONY laptop

Steps:
1. Get the latest driver from NVIDIA and unpack it.
2. Look up the hardware id of the Graphic card in Device Manager -> Display adapters -> NVIDIA GeForce 8400M GS -> Properties -> Details tab. Select "Hardware Ids" from the Property dropdown checkbox and then it will be listed. There should be something like PCI\VEN_10DE&DEV_0427&SUBSYS_9008104D. Here 0427 after DEV_ is the hardware id.
3. Go the driver folder unpacked earlier and locate nvam.inf (in driver folder) and open it with any text editor. Find the entries start with %NVIDIA_DEV.0427, and replace the value after SUBSYS_
Ex.
From %NVIDIA_DEV.0427.01% = Section001, PCI\VEN_10DE&DEV_0427&SUBSYS_17C21043
To %NVIDIA_DEV.0427.01% = Section001, PCI\VEN_10DE&DEV_0427&SUBSYS_9008104D
5. Save the nvam.inf
6. Run the setup.exe to install the latest driver