Difference between revisions of "Dev Maintenance"

Revision as of 18:29, 1 October 2010

Updating the Dreamwidth code

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                     # for Dreamhacks
sudo /etc/init.d/apache2 stop   # for people running their own

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.

cd $LJHOME
bin/cvsreport.pl -update
# only sync changes from the CVS to the live code
bin/cvsreport.pl -sync -cvsonly
bin/cvsreport.pl -sync -cvsonly

Yes, you do it twice. If the multicvs.conf file changed, then the first one pulls that file in, and the second one will notice whatever changed according to that file. 99% of the time once is enough, but every once in a while... so it's a good habit to have.

# 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

If you accidentally write over your config-local.pl file, and you're using a Dreamhack, you will get a DB connect error when you try to run the above update-db.pl commands. In that case, you'll need to fix DBINFO in config-private.pl so that you can connect to the database.

Now you can restart Apache:

start-apache                     # for Dreamhacks
sudo /etc/init.d/apache2 start   # for people running their own

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.)

Updating to the correct branch

Work is being done on the 'default' branch. When you create a new copy of the repository, it automatically updates to the tip of the default branch. This should be the correct tip. You can also sync to the tip by using:

cd $LJHOME/cvs/dw-free
hg update -C tip

If for some reason the active branch is not pointing to 'default', then you can sync to 'default' manually by doing 'hg update -C default'. Be careful: the '-C' option will revert any modified files, and you may need to do another tip update after switching branches.

Syncing code to live

To be running production code, you also need to sync to your live code from the repository copy:

bin/cvsreport.pl -sync -cvsonly

You will also want to delete files from your live code that have been deleted from the repository:

cd $LJHOME; for i in `bin/cvsreport.pl -n -1`; do echo "Removing $i" && rm $i; done

Updating your system

On Ubuntu, you can update the packages on your system with:

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

(Note, you may not need to do this step if you're on a Dreamhack and Sophie or Afuna has already done it for everyone.)

Scripting

You can, of course, use scripts to make it easier for you to do most of this. Some 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
hg -R $LJHOME/cvs/dw-free qpop -a && \
$LJHOME/bin/cvsreport.pl -u && \
hg -R $LJHOME/cvs/dw-free qpush -a

Now, when you type 'dwu', this script will pop out any MQ patches you may have currently in dw-free, update the code to the latest available, and push your dw-free MQ patches back.

If you need support for dw-nonfree too, just duplicate the lines mentioning dw-free and edit them to say dw-nonfree and make sure that all the lines apart from the first and last end with '&& \':

#!/bin/bash
hg -R $LJHOME/cvs/dw-free qpop -a && \
hg -R $LJHOME/cvs/dw-nonfree qpop -a && \
$LJHOME/bin/cvsreport.pl -u && \
hg -R $LJHOME/cvs/dw-free qpush -a && \
hg -R $LJHOME/cvs/dw-nonfree qpush -a

dws - Syncing the live code

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

#!/bin/bash
$LJHOME/bin/cvsreport.pl -s -c && \
$LJHOME/bin/cvsreport.pl -s -c

This script will synchronise the live code twice when you type 'dws'.

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'.

tocvs - Switch between /cvs and live directories

As of Jan 13, this is already in the default .bashrc in dreamhacks, so you shouldn't need to add it.

If you don't see the line "alias tocvs="source ~/bin/tocvs.real"" in your ~/.bashrc, you can add the following function yourself:

tocvs() {
  DIR=$PWD
  REPO=${1-'dw-free'}
 
  if  [[ "$REPO" == "f" ]]; then REPO="dw-free";    fi
  if  [[ "$REPO" == "n" ]]; then REPO="dw-nonfree"; fi
 
  if [[ "$DIR" =~ ^$LJHOME ]]; then
    if [[ "$DIR" =~ ^$LJHOME/cvs/([^\/]+) ]]; then
      FROMREPO=${BASH_REMATCH[1]}
      if [[ "$1" == "" ]]; then
        DIR=${DIR/#$LJHOME\/cvs\/$FROMREPO/$LJHOME}
      else
        DIR=${DIR/#$LJHOME\/cvs\/$FROMREPO/$LJHOME\/cvs\/$REPO}
      fi
    else
      DIR=${DIR/#$LJHOME/$LJHOME\/cvs\/$REPO}
    fi
  fi
  cd $DIR
}

Then, start a new shell or log in again for the change to take effect. Now, whenever you're in a code directory, you can use 'tocvs' to switch back and forth from the live directory and the corresponding /cvs directory. It defaults to 'dw-free'; if you wish to go to another repository instead (for example, 'dw-nonfree'), give it as a parameter. (for example, 'tocvs dw-nonfree'). If you specify a repo name while you're already in a repository, it will switch to the named repository.

The repositories 'dw-free' and 'dw-nonfree' are aliased as 'f' and 'n' respectively.

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:

find -name *.orig -o -name *.rej | xargs rm

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.