Difference between revisions of "Dev Maintenance"

Revision as of 03:30, 9 November 2012

Updating the Dreamwidth code on your Dreamhack

Shutting down apache

It is best to shut your Apache instance down before doing the update process, to make sure that everything, especially scripts in cgi-bin/ are reloaded properly:

stop-apache

Updating dw-free

Okay. Let's say you've been running your Dreamwidth install and you want to pull down the latest and greatest in fixes. This is pretty easy. First, if you are not somewhere in dw-free, get into that directory:

cd $LJHOME

Then grab updates from the development and master branches of Dreamwidth's repository:

git fetch dreamwidth
git pull --ff dreamwidth develop:develop
git pull --ff dreamwidth master:master

You will also want to push the Dreamwidth repository changes to your fork on Github:

git push origin develop
git push origin master

Note: if you are working on uncommitted changes in a branch, any automerge will be canceled. Example:

mw@memewidth:~/dw/src/jbackup$ git pull dreamwidth develop:develop
remote: Counting objects: 180, done.
remote: Compressing objects: 100% (54/54), done.
remote: Total 116 (delta 90), reused 88 (delta 62)
Receiving objects: 100% (116/116), 36.23 KiB, done.
Resolving deltas: 100% (90/90), completed with 41 local objects.
From https://github.com/dreamwidth/dw-free
   53294c1..19b8e73  develop    -> develop
error: Your local changes to 'src/jbackup/jbackup.pl' would be overwritten by merge.  Aborting.
Please, commit your changes or stash them before you can merge.

We will get into merging in changes in the following section.

Merge the changes with your branch(es)

You should be doing your development in branches separate from the main Dreamwidth branches. You can check what branches you currently have in your repository with the command:

git branch

The current branch will have an asterisk next to it. Here is an example:

yourhack@dreamhack.net:~/dw$ git branch
  develop
* feature/Mobile
  master

You can check to see if you have unsaved changes on your currently checked out branch with:

git status

To temporarily save these changes while you make your updates, use:

git stash

You can then merge your independent branch with the changes made with Dreamwidth's development branch:

git merge develop

And if you have saved changes using stash, you can recover them with:

git stash pop

You can change branches with git checkout BRANCH, example:

git checkout feature/Mobile

For those using DW non-free

Repeat for dw-nonfree:

cd $LJHOME/ext/dw-nonfree

git pull dreamwidth develop:develop
git pull dreamwidth master:master
git push origin develop
git push origin master

If you have any branches on dw-nonfree, they will also need to be merged with the development branch of dw-nonfree as described in the above section:

git merge develop

Update your database

Now that your code has been updated, update the database:

# order of commands is important
$LJHOME/bin/upgrading/update-db.pl -r -p --innodb
$LJHOME/bin/upgrading/update-db.pl -r --cluster=all --innodb
$LJHOME/bin/upgrading/texttool.pl load

Remember that different branches might have different text strings you have added, and that you might need to update your database for different branches when you are working on them for those text strings to work. The same applies for any database changes made by different branches you are working on.

Restart the server

Now you can restart Apache:

start-apache

Of course, in a production environment, this whole process is not too recommended as you never know what kind of code you're going to get. But for the most part, it's fairly straightforward. (And if you're doing development, this is generally safe.)

Additional Information for Non-Dreamhack Users

This section is only for you if you're running your own installation.

Instead of using start-apache/stop-apache, which are Dreamhack-specific scripts, use these commands:

sudo /etc/init.d/apache2 start
sudo /etc/init.d/apache2 stop 

You'll also want to update packages on your system at some point. On Ubuntu, this would be done using:

apt-get update
apt-get upgrade

Or, if you want an easy command to run on your dw account in one swoop:

sudo apt-get update && sudo apt-get upgrade

Scripting

You can, of course, use scripts to make it easier for you to do some of this.

There is an "omnibus" script available at http://dw-dev.dreamwidth.org/94822.html which incorporates all the individual scripts listed here and some other functions, and includes help information.

Some simpler example scripts are given below.

dwu - Updating the repos

Put this code in a file called ~/bin/dwu and make it executable with chmod ugo+x ~/bin/dwu:

#!/bin/bash
 
# make sure we are in the right directory;
# save previous directory
oldpwd=$PWD
cd $LJHOME
git fetch dreamwidth
 
# pull changes from dreamwidth
git checkout develop
git pull --ff dreamwidth develop
git checkout master
git pull --ff dreamwidth master
 
# push them to Github forks
git push origin develop
git push origin master
 
# return to old directory
cd $oldpwd

Now, when you type 'dwu', this script will update dw-free. If you need to update dw-nonfree as well, then use this code:

#!/bin/bash
 
# make sure we are in the right directory;
# save previous directory
oldpwd=$PWD
cd $LJHOME
 
git fetch dreamwidth
 
# pull changes from dreamwidth
git checkout develop
git pull --ff dreamwidth develop
git checkout master
git pull --ff dreamwidth master
 
# push them to Github forks
git push origin develop
git push origin master
 
# change to dw-nonfree
cd $LJHOME/ext/dw-nonfree
 
git fetch dreamwidth
 
# pull changes from dw-nonfree
git checkout develop
git pull --ff dreamwidth develop
git checkout master
git pull --ff dreamwidth master
 
# push them to Github forks
git push origin develop
git push origin master
 
# return to previous directory
cd $oldpwd

dwdb - Updating the database

Put this code in a file called ~/bin/dwdb and make it executable with chmod ugo+x ~/bin/dwdb:

#!/bin/bash
$LJHOME/bin/upgrading/update-db.pl -r -p --innodb && \
$LJHOME/bin/upgrading/update-db.pl -r --cluster=all --innodb && \
$LJHOME/bin/upgrading/texttool.pl load

This will update the database when you type 'dwdb'.

Cleaning up your directories

If you do any amount of work, you'll find that your directories get cluttered with .orig and .rej files everywhere. This script will clean those up:

git clean -f "*.rej" "*.orig"

You can run it from the command line, or put it in a file called ~/bin/tidy and make it executable with "chmod +x ~/bin/tidy". If you do that, you'll be able to just type "tidy" to clean house.