bashfunc - Bash Function Library

Posted: 2017-03-08 15:27:11 by Alasdair Keyes

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I've been doing some systems scripting in BASH the past couple of days and often find myself recoding the same functionality over and over, not just at work but home too. So I decided that I'd write a library to cover some common functionality I find myself needing.

All functions are explained in the README.md and working examples are in bashfunc_examples.sh in the repo.

It's designed for use with BASH 4 and up. Test it out and let me know if there's other common functionality that could be added. I'm currently adding to it quite frequently as my requirements grow so keep checking for new versions.

https://github.com/alasdairkeyes/bashfunc


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RSS Feed

Posted: 2017-02-23 22:44:30 by Alasdair Keyes

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I've finally got round to re-implementing RSS feed on the site again. Links are here ^^^. Or here RSS feed


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Trello all the things

Posted: 2017-02-11 23:36:51 by Alasdair Keyes

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I've used Trello a number of times for work projects and I've always enjoyed using it. It's simplicity is the key to it's usefulness.

I've now moved onto using it personally too. Previously my todos were on a Memo app on my phone. Now I mainly use Trello on my laptop, but also the App on my phone for when I'm out and everything goes on there.

The act of moving cards from Todo to Done fills me with more pleasure than it really should.... but it keeps me productive! It's well worth looking to move to it if you're the kind of person that makes a lot of lists.


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MySQL encrypted client password storage

Posted: 2017-02-10 14:27:55 by Alasdair Keyes

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For years I've been using MySQL's ~/.my.cnf file to automatically manage logins for databases. However it's never sat well with me due to the fact that the file is plain text and even though you can restrict access with 0600 permissions, it's never good to have a password stored in plaintext.

I've recently been working on a MySQL 5.7 cluster and needed access to the production slave database and this issue raised it's head again. However as of MySQL 5.6, there is the option to store login details encrypted using mysql_config_editor

This tool allows you to setup profiles to access servers and store the details encrypted.

For example my previous ~/.my.cnf/ file might have

[mysql]
username=al
password=ComplexPassword

I could then access mysql like so...

# mysql
mysql> 

Now you define a profile so for the above example use

# mysql_config_editor set --login-path=localhost --host=localhost --user=root --password
Enter Password: <enter password>

--login-path is just a name and can be anything you like.

I can now login by specifying the login path

# mysql --login-path=localhost

What's nice is that you don't need to specify all the details, if you had a production and beta environment both with multiple servers you could run the following with different passwords and then supply the hostname on the command line

# mysql_config_editor set --login-path=production --user=root --password
Enter Password: <enter password>
# mysql_config_editor set --login-path=beta --user=root --password
Enter Password: <enter password>
# mysql --login-path=production -h proddb3
mysql>

The data is now stored in ~/.mylogin.cnf and is not readable

# cat ~/.mylogin.conf
<<JUMBLEDMESS>>

If you want to make backups or see what profiles you have, you can use

# mysql_config_editor print --all
[production]
user = root
password = *****
[beta]
user = root
password = *****

Removing profiles is as easy as

# mysql_config_editor remove --login-path=production


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TDD Deciphered

Posted: 2017-02-09 12:16:58 by Alasdair Keyes

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I recently happened upon this website about how to use TDD when building a project. Although it's written for PHP and PHPUnit, the premise can be applied to any language. The great thing about this site over others is that it actually shows TDD on the lifecycle of a valid project, not just using trivial one off examples.

https://tdd-deciphered.com/


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PHP Apigen

Posted: 2016-12-28 20:34:21 by Alasdair Keyes

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After discussions at work on producing code documentation, I was introduced to http://www.apigen.org/.

I'm not quite sure how I've not seen it before, but it is very slick and certainly something I'm going to look at using int he future.

More information about what it does can be seen on their site, but it essentially reads the PHPdoc blocks in your code and outputs to a nice HTML page that you can publish.

The key part is just how easy it is, from the root of your project run

apigen generate --source src_folder --destination public/docs

You can easily add it into a script for jenkins or for local a development branch, add it into the post update/install commands of your composer.json.


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Strengthen your PHP Composer dependencies

Posted: 2016-12-21 22:38:22 by Alasdair Keyes

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For those of you that use Composer to install and manage dependencies in your PHP App, you may be interested in https://github.com/Roave/SecurityAdvisories.

When updating your dependencies, it will alert if the versions you are using contain known vulnerabilities. It's quite simple in it's operation, the composer.json file populates the conflict key with a list of package versions that are known to be insecure so composer will fail to update.

The list isn't exhaustive, but it contains a number of large packages such as Doctrine, Drupal, Zend, Symfony


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Blog update to markdown

Posted: 2016-11-26 12:27:11 by Alasdair Keyes

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For the duration of this blog's life the HTML for the post has been stored directly in the database.

I have now decided to move to Markdown as it is so much cleaner and easier to use. I've implemented the PHP Parsedown Library and the existing articles are slowly being migrate to markdown in small batches and the old ones still in HTML... because I really can't face changing all the articles at once. Hopefully if all has gone OK, you won't notice anything (as is mostly the way with IT)


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OSX Sierra Upgrade and broken dev tools

Posted: 2016-11-25 13:03:53 by Alasdair Keyes

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I upgraded my work Macbook from OSX El Capitan to Sierra after which git started returning a very unfriendly message

$ git status
git xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

It turns out to be an issue with the OSX developer tools installation. Reinstall it with the following (requires sudo password) and you'll be good to go.

$ xcode-select --install


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Vagrant insecure key detected

Posted: 2016-11-17 22:26:51 by Alasdair Keyes

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I recently downloaded the Ansible Tower free trial.

They have an easy to use Vagrant setup, however when running it on my Linux Mint box, I received the following error

default: Inserting generated public key within guest...
default: Removing insecure key from the guest if it's present...
default: Key inserted! Disconnecting and reconnecting using new SSH key...
default: Warning: Authentication failure. Retrying...
default: Warning: Authentication failure. Retrying...

If the box is just a trial and security is not of prime importance, you can add the following to the Vagrantfile to resolve it.

config.ssh.insert_key = false

And you it should build fine and allow you access with a vagrant ssh


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