To push a new branch to remote

git push origin new_branch

To delete a remote branch

git push origin :new_branch

To push new tags

git push --tags origin

To delete a remote tag

git tag -d 12345
git push origin :refs/tags/12345

To reset a local branch to exactly match a remote branch

git fetch origin
git reset --hard origin/master

To abort a rebase

git rebase --abort

Changing the origin of your git repository (relocate the repository)

git config remote.origin.url [new origin url]

Last update: 2012/01/04

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Use the following statement to create a schema dump that contains all table and view definitions as well as all stored procedures without a reference to the original schema:

 mysqldump -uroot -p name_of_the_original_schema --no-data --opt --routines | sed 's/`name_of_the_original_schema`.//g' > dump.sql

The dump will only contain the schema definition and no data. Calls to routines will not be prefixed with a schema name.

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Invert the iTunes Store links in the list

The littler arrows can either point to the iTunes store or to the same artist or album in your library. Invert their behavior to let them point to your files instead of the store:

defaults write com.apple.iTunes invertStoreLinks -bool YES

Undo this with

defaults write com.apple.iTunes invertStoreLinks -bool NO

Disable them with

defaults write com.apple.iTunes show-store-arrow-links -boolean FALSE

Enable them with

defaults write com.apple.iTunes show-store-arrow-links -boolean TRUE

Restore the horizontal stoplight

Again, Apple messes with it’s own UI guidelines. To restore sanity, use

defaults write com.apple.iTunes full-window -boolean TRUE

Reenable the vertical layout introduced with iTunes 10 through

defaults write com.apple.iTunes full-window -boolean FALSE

Enable half-star ratings

The following will let you rate your songs with half-star ratings (i.e 3.5 stars):

defaults write com.apple.iTunes allow-half-stars -bool TRUE

If you don’t like the fact, that the half-star ratings will round on any i* device, turn it off again:

defaults write com.apple.iTunes allow-half-stars -bool FALSE

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If your nic supports WOL, it probably needs to be enabled in your computers BIOS first.

Most WOL tools use the “MagicPacket(tm)” method, so the right command to enable it on the nic “eth0″ would be

ethtool -s eth0 wol g

This is not a persistent setting and it is gone after a reboot. Most tips around recommend creating a runlevel script for executing this command after boot or before shutdown.

I’ve added the command as a hook in my network scripts:

auto eth0
iface eth0 inet dhcp
        pre-down ethtool -s eth0 wol g

You can also use post-up. I like this method because i tend to forget about my runlevel scripts and so i keep the network stuff in one place

If you are a debian user, you maybe need to stop your system from turning off the nic on HALT. To do so, add

NETDOWN=no

to “/etc/default/halt”.

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module ActionView
  module Helpers #:nodoc:
    module AssetTagHelper
      def image_path(source)
        compute_public_path(source, 'static_images')
      end
      alias_method :path_to_image, :image_path # aliased to avoid conflicts with an image_path named route
    end
  end
end

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To revert a complete working copy or a single file use:

svn merge -rHEAD:PREV .
# or
svn merge -rHEAD:PREV path/to/file
svn commit -m "reverted"

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Smart spawning of Passenger processes creates shared file descriptors. As the connections to memcached are sockets they are shared as well so data on them gets corrupted which is explained very nicely in the Passenger documentation: Example 1: Memcached connection sharing (harmful).

The solution presented there works like a charm. The reestablish_connection_to_memcached line is actually not more than CACHE.reset where CACHE is the reference to the memcache connection.

After that change, spawning methods smart-lv2 and smart will work in connection with environment.rb configured memcache connections.

Edit: As requested in the comments, a little example:

memcache_options = {
  :c_threshold => 10000,
  :compression => true,
  :debug => false,
  :namespace => 'some_ns',
  :readonly => false,
  :urlencode => false
}
 
CACHE = MemCache.new memcache_options
CACHE.servers = '127.0.0.1:11211'
begin
   PhusionPassenger.on_event(:starting_worker_process) do |forked|
     if forked
       # We're in smart spawning mode, so...
       # Close duplicated memcached connections - they will open themselves
       CACHE.reset
     end
   end
# In case you're not running under Passenger (i.e. devmode with mongrel)
rescue NameError => error
end

In this case, CACHE is the global constant that i use to access my memcache-client.

I guess you’ll need to do the same with the global Rails.cache object, but i’m not sure. Anyway, the above solution works for me.

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It seems, that passengers spawn method “smart” isn’t compatible with memcached. Within seconds on a lightly loaded server the cache gets corrupted big time.

I got better results with a newer memcache client (the ruby gem actually), but for that i need to remove the client from the rails vendor lib. Furthermore, under higher load there still where errors.

Only solution is to set the spawn method to conservative like so

RailsSpawnMethod conservative

Problem seems to be known in the Phusion and Rails teams.

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Time.now.xmlschema

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# Turn it off for just some columns
class Picture < ActiveRecord::Base
 def self.skip_time_zone_conversion_for_attributes
   [:created_at, :published_at]
 end
end
 
# Turin it off for the whole model
class Picture < ActiveRecord::Base
 def self.time_zone_aware_attributes
   false
 end
end

Thanks a lot!

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