Ton Kersten

New version of git.vi

I was working on a customers project and I had to change a lot of files. This could easily be done with the sed and find commands, but I wanted these changes to be checked in into git as well. And I also wanted the git keywords expanded.

There was always the trick to edit all the files with sed, then edit them again with git.vi and just press ZZ for all files. This would be tedious, I know.

So I decided to take the Geeks Shortcut and recode git.vi so everything can be be done automatic.

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umask per directory

Some users insist on using bash. This is a good shell, but not as good as zsh. But, I do want them to be able to use the per directory umask as well as all the zsh users.

So I started digging, as the bash shell does not support a chpwd hook.

This is what I came up with:

chpwd()
{   # Set the initial umask
    case "${PWD}/"
    in
        /etc/puppet/*)
            um=$(umask)
            umask 007
        ;;
        *)
            [[ x"${um}" != x"" ]] && umask ${um}
        ;;
    esac
}
function cd()
{
    builtin cd "${@}"
    chpwd
}

Now, when I change to the directory /etc/puppet I do get a umask of 007 and when I cd somewhere else, I do get the original umask.

I do redefine the intercal cd command to run the chpwd hook. There must be a more elegant way to do this, but this does the job.

umask per directory

I've been working with Puppet some time now, and we are configuring our way through a lot of hosts, with 6 persons, all working in the same Puppet master directory.

This should work fine with all UNIX/Linux groups and setgid directories. But simple problem arose with the git version control stuff.

Once in a while the complete git repo was destroyed and quite a lot of searching revealed the reason why.

We are all working as non-root and we are all members of the Puppet group. But: When I edit a file and commit it, the corresponding files in the git repo are made by me and the rights are set according to my umask. When someone else tries to edit the same file or something else which results in the same hash files, writing is not permitted, because of my ownership. A chown in a script will not work, as a chown is not honored as a non-root user.

This problem can simply be solved by setting the umask to something like 007 (or u=gwx,g=gwx,o=). But when I do edit stuff in my home-directory I do not want an open umask like that. So what to do, as ext[234] do not support per directory umasks.

I use zsh as a shell and I found a nice function in the man-page. There is a standard function, called chpwd() that gets executed every time a directory change is made. So I only had to fill in the blanks.

This is what I came up with:

chpwd()
{
    case "${PWD}/"
    in
        /etc/puppet/*)
            [[ ${UMSAVE} = 0 ]] &&
            {   um=$(umask)
                UMSAVE=1
            }
            umask 007
        ;;
        *)
            [[ x"${um}" != x"" ]] && umask ${um}
            UMSAVE=0
        ;;
    esac
}

Now, when I change to the directory /etc/puppet I do get a umask of 007 and when I cd somewhere else, I do get the original umask.

How much fun can it be

No more WikiLeaks?

The WikiLeaks site cannot be reached. This is because their free DNS provider everydns.com removed the DNS records.

The last IP address was 213.251.145.96, but nobody is answering the http requests.

Looks like they where shutdown.

New MySQL backup

I was playing around and configuring the MySQL backup on a customers database server and I ran into little problems. One of the defaults was not parsed correctly and a configuration setting made things run amok.

So I decided to streamline things and create some extra program options to set and show the default settings and the settings after the configuration file.

The help now shows:

mysqlbackup version 1.50
Syntax: mysqlbackup [ -h|-v|-s|-c|-d|]
    -h           Display this help and exit
    -v           Display the version number and exit
    -s           Show the defaults and their values
    -d           Show a description of the defaults and their values
    -c           Show a default configuration file
    -a           Show settings after the config file is processed
    configfile   Use this file as the configuration file
                 instead of the default.
                 Default: /usr/local/bin/mysqlbackup.conf

Come and g[ei]t it. It's in the download section or on GitHub.

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