Jun 142009

I have came across many projects where checking file uploads and content-type (mime-type) is poorly implemented or heavy in resource.veroxybd.com

Methods I have seen so far:inFOLIO Research Group

1. Checking content-type from file name: this inefficient, a user can just rename a file and you are fooled, or the file can have a different file format and you will not get the expected result.

2. Using Rmagick to check if the file is an image. This is so slow and uses so much Ram. You can try to initialize an rmagick object from an image file, then rescue when the file is not an image.

3. Using mini_magick to check if a file. This method is faster than rmagick. Implemen ted same way as rmagick.

A Better method for OSX and Linux,  is to use the command line tool “file” included in most UNIX operating systems.

It is very fast and very accurate.

Some examples of content types:

.doc = Microsoft Word document data

.doc = Microsoft Office Document

.pdf = PDF document, version 1.4

.pdf = PDF document, version 1.3

.psd = Adobe Photoshop Image

.png = PNG image data, 3508 x 4961, 8-bit/color RGBA, non-interlaced

.gif = GIF image data, version 89a, 195 x 109

.jpg = JPEG image data, EXIF standard


I hope this can be useful to someone.

Easy installing Nginx + mod_rails passenger OSX

 nginx, osx  Comments Off on Easy installing Nginx + mod_rails passenger OSX
Jun 142009

Requirements:Балки обвязочные

1. XCODE you can download xcode from http://developer.apple.com/tools/xcode/index.html

2. OSX 10.4, 10.5 or 10.6


1. Install Passenger

$ sudo gem install passenger

now check where is passenger installed:

in my case is: /opt/local/lib/ruby/gems/1.8/gems/passenger-2.2.5

2. Install nginx

If you have nginx from macports, deactivate it in case of conflicts.

You can activate anytime later

$ sudo port deactivate nginx

$ wget http://sysoev.ru/nginx/nginx-0.7.59.tar.gz

$ wget http://sysoev.ru/nginx/nginx-0.7.62.tar.gz

$ tar xpf nginx-0.7.62.tar.gz

$ cd nginx-0.7.62

I Recommend using nginx 0.6 series because I had a lot of “502 Bad Gateway” with 0.7 series.

$ wget http://sysoev.ru/nginx/nginx-0.6.37.tar.gz

$ tar xpf nginx-0.6.37.tar.gz

$ cd nginx-0.6.37

$ sudo make

$ sudo make install

$ cd /opt/local/conf

$ sudo cp mime.types.default mime.types

$ sudo cp nginx.conf.default nginx.conf

Edit nginx.conf

$ mate nginx.conf


$ sudo vi nginx.conf

Now edit your /etc/hosts and add the hosts for your local project

$ mate /etc/hosts

3. Start nginx

sudo nginx

4. go to your browser and open project1.local


5. Easy start/restart/stop

add this to your ~/.bash_profile file


1. Nginx is not running

– check the logs

– check if it is really not running:

$ ps aux | grep nginx

2. you see the nginx error “502 Bad Gateway”

– may there is a problem with the /var/folders/ permissions on OSX:

to fix it I did this:

$ sudo find /var/folders/xl/ -name “master” -exec chmod 755 {} \;

$ sudo find /var/folders/xl/ -name “-Tmp-” -exec chmod 755 {} \;

everytime I reboot my mac I had to do that… I still dont know how to fix it…

anybody knows?

That is it for now.

Dec 182008

Firefox does a lot of IO to the disk even thou you have lots of spare Ram, due to Sqlite, Bookmarks, History and Cache.бизнес

To make Firefox faster is to store the whole profile folder into a Ram Disk.
RamDisk in Linux are called TmpFS. You can also use shared memory folder /dev/shm if you have it in your fstab.

This post in the gentoo forums explains how to do it in Gentoo linux.

I made a similar script to make it work in OSX Leopard.

The Script have 2 parts, Start.sh and Stop.sh
Here are the Scripts:



You can also use ‘tar’ instead of ‘rsync’. I just love rsync more.

* Warning: The ramdisk contents will be erased after you umount the ramdisk.

Have fun.

Gentoo Linux ROCKS


To speed up firefox even more  run these commands:

Nov 042008

The OSX file vault feature will only let you activate it on your current home folder if you have a HFS+ case-insensitive file system. It will not let you activate it on a current HFS case-sensitive.dekor-okno.ru

But there is a trick, when creating a “new” clean user it will allow you to enable filevault for that new user.

So, here is how you do it.

But before you try, make sure you have enough free space, try to get rid of huge files and folders, backup your data. (in this case, we will copy your data, so you will have 2 copies for safety)

Also clean your applications cache, such as firefox cache, camino, opera,
~/Library/caches/com.apple.Safari/Webpage\ Previews/ , etc…: and close most of your applications.

$ cd ~/Library/Caches

$ find ./ -name “Cache” -exec rm -rf {} \;

$ rm -rf ~/Library/Caches/com.apple.Safari/Webpage\ Previews/Incoming/*


1. Create another admin user, for example “admin”, with administrator privileges

2. login as that user.

3. move your old user folder.

$ cd /Users/

$ sudo mv myusername myusername.bak

3. delete your old user from the “Accounts” preferences pane.

4. then create it again and check the option to use filevault

5. Logout from “admin” and login again as newuser.

6. Now copy the old data to your home folder. ( will take a very long time for that)
update: You must use rsync instead of cp, so that you also copy your VERY important hidden files. such as .ssh .gnupg .vimrc .gem .gitconfig etc..

$ sudo /usr/bin/rsync -av /Users/myusername.bak/ /Users/myusername/

# watch out if you have files that should not change the ownership, such as server backups.
$ sudo chown -R myusername ~/

7. Logout and login again, for your preferences to take effect

8. If everything looks fine, you might just delete the backup folder.

$ sudo rm -rf /Users/myusername.bak

if you have any confusions let me know in comments.

FastSleep or Hibernate on OSX Leopard? ;)

 osx  Comments Off on FastSleep or Hibernate on OSX Leopard? ;)
Nov 012008

First of all, what do I mean by safe sleep, fast sleep or hibernate?mountainsphoto.ru

Safe sleep is the way OSX sleeps to RAM and as well create a sleepimage (which is the size of your RAM). In case you run out of battery, so you can still resume from the image if the battery is dead, (and you have plugged it in :)  Provides very fast wake up, uses the battery while sleeping.

Fast Sleep is just sleep to RAM, same as safe sleep but no image creation, and if your battery is dead, the mac will cold boot. Provides very fast wake up same as safe sleep, uses the battery while sleeping.

Hibernate is when it uses the sleepimage all the time. Slower sleep and slow wake up, but it does not use battery at all…


I found in this website http://alt.cc/jk/2007/08/07/safe-sleep-addendum/ this nice script that handles when to FastSleep or when to Hibernate.

you can get safe sleep with the command “$ sudo pmset hibernate 3”

I have modified the script it little :

save it as /Users/your_user_name/.crons/safesleep.sh

now make it permanent in a crontab to run every 10 minutes, but wait, anacron (osx default cron) only supports daily/weekly/monthly jobs! (unless you patch it)

I guess we’ll have to install fcron:

$ sudo port -d install fcron

$ sudo vi /opt/local/etc/fcrontab

@,runas(root) 10 sh /Users/your_user_name/.crons/safesleep.sh

$ sudo launchctl load -w /Library/LaunchDaemons/org.macports.fcron.plist

$ sudo launchctl start org.macports.fcron

that’s it.


Dec 172007

Encrypt folders in Mac OSX with encfstrevordiy.wordpress.com

OSX already include the File Vault functionality that allows you to encrypt your whole Home Folder.
Thou the storage overhead is so small, the time to encrypt it the first time is very very long.
if you have Videos, and big files, it takes even longer.RA Grani

What if I don’t want to encrypt my big folders like Movies, Music, Pictures, Pdfs?

I only want to encrypt my Documents folder.
Be aware that VMWARE stored the virtual machine files under this folder, you should move it to outside Documents.


Be careful with this tutorial,
Write down your password somewhere and BACKUP your data before going further these steps.

if you forget your password, say good bye to your data.


TOOLS required:

# update your ports to get the latest encfs that runs ok on OSX10.5
$ sudo port selfupdate

# install encfs
$ sudo port install encfs

or Download macfuse and encfs from google:




Lets move The Documents folder contents to another folder:

$ cd
$ mkdir temp_documents
$ mv Documents/* temp_documents/

Create the directory to hold the encrypted files, it can be any name.

Run this only one time. The first time to setup the folder…

$ mkdir .documents

Setup the encryption

$ encfs ~/.documents/ ~/Documents/

you will see this:

now, after you pass this step, the file system will be mounted as well .

encfs uses FuseFS, so it behaves just like a mount point

to unmount it you do

$ unmount ~/Documents

to mount it again issue this command:

$ encfs ~/.documents/ ~/Documents/
# or this way, which will look with better names and a folder icon on Desktop:
$ encfs ~/.documents/ ~/Documents/ -- -o fsname=Documents -o volname=Documents -o local

to check mounted filesystems

$ mount

you should be able to see:

encfs@fuse2 on /Users/fred/Documents (fusefs, nodev, nosuid, synchronous, mounted by fred)

or this if you used the longer command.

Documents on /Users/fred/Documents (fusefs, local, nodev, nosuid, synchronous, mounted by fred)

Now, with the encrypted folder “mounted”, mv the data from that temp folder to the new encrypted folder:

WARNING: be carefull here

$ cp temp_documents/* Documents/
$ rm -rf temp_documents/

that’s it folks.

Final overview:

# to create the encrypted folder:
$ encfs ~/.documents/ ~/Documents/
#to Mount it (enable)
$ encfs ~/.documents/ ~/Documents/
$ encfs ~/.documents/ ~/Documents/ -- -o fsname=Documents -o volname=Documents -o local
#to Umount it (disable)
$ umount ~/Documents

don’t change anything inside .documents
remember the dot in the front means the folder is invisible
you won’t see it in Finder.

This also should work for Linux.

Switch to our mobile site