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https://github.com/TiBeN/CrontabManager

PHP library for GNU/Linux cron jobs management.
https://github.com/TiBeN/CrontabManager

composer cron cron-jobs crontab linux php php-library

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PHP library for GNU/Linux cron jobs management.

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CrontabManager

==============



PHP library to manage programmatically GNU/Linux cron jobs.



It enables you to :



-   Deal with your cron jobs in PHP.

-   Create new Cron jobs.

-   Update existing cron jobs.

-   Manage cron jobs of others users than runtime user using some sudo

    tricks (see below).



Requirements

------------



-   PHP 5.3+

-   `crontab` command-line utility (should be already installed in your

    distribution).

-   `sudo`, if you want to manage crontab of another user than runtime

    user without running into right issues (see below)



Installation

------------



The library can be installed using Composer.



    composer require tiben/crontab-manager ~1.0



Usage

-----



The library is composed of three classes:



-   `CrontabJob` is an entity class which represents a cron job.

-   `CrontabRepository` is used to persist/retrieve your cron jobs.

-   `CrontabAdapter` handles cron jobs persistance in the crontab.



### Instantiate the repository



In order to work, the CrontabRepository needs an instance of

CrontabAdapter.



``` {.php}

$crontabRepository = new CrontabRepository(new CrontabAdapter());

```



### Create new Job and persist it into the crontab



Suppose you want to create a new job which consists of launching the

command "df >> /tmp/df.log" every day at 23:30. You can do it in

two ways.



-   In Pure oo way :



    ``` {.php}

    $crontabJob = new CrontabJob();

    $crontabJob

        ->setMinutes(30)

        ->setHours(23)

        ->setDayOfMonth('*')

        ->setMonths('*')

        ->setDayOfWeek('*')

        ->setTaskCommandLine('df >> /tmp/df.log')

        ->setComments('Logging disk usage'); // Comments are persisted in the crontab

    ```



-   From raw cron syntax string using a factory method :



    ``` {.php}

    $crontabJob = CrontabJob::createFromCrontabLine('30 23 * * * df >> /tmp/df.log');

    ```



You can now add your new cronjob in the crontab repository and persist

all changes to the crontab.



``` {.php}

$crontabRepository->addJob($crontabJob);

$crontabRepository->persist();

```



### Find a specific cron job from the crontab repository and update it



Suppose we want to modify the hour of an already existing cronjob.

Finding existings jobs is done using some regular expressions. The regex

is applied to the entire crontab line.



``` {.php}

$results = $crontabRepository->findJobByRegex('/Logging\ disk\ usage/');

$crontabJob = $results[0];

$crontabJob->setHours(21);

$crontabRepository->persist();

```



### Remove a cron job from the crontab



You can remove a job like this :



``` {.php}

$results = $crontabRepository->findJobByRegex('/Logging\ disk\ usage/');

$crontabJob = $results[0];

$crontabRepository->removeJob($crontabJob);

$crontabRepository->persist();

```



Note: Since cron jobs are internally matched by reference, they must be

previously obtained from the repository or previously added.



### Work with the crontab of another user than runtime user



This feature allows you to manage the crontab of another user than the

user who launched the runtime. This can be useful when the runtime user

is `www-data` but the owner of the crontab you want to edit is your own

linux user account.



To do this, simply pass the username of the crontab owner as parameter

of the CrontabAdapter constructor. Suppose you are `www-data` and you

want to edit the crontab of user `bobby`:



``` {.php}

$crontabAdapter = new CrontabAdapter('bobby');

$crontabRepository = new CrontabRepository($crontabAdapter);

```



Using this way you will propably run into user rights issues. This can

be handled by editing your sudoers file using 'visudo'.\

If you want to allow user `www-data` to edit the crontab of user

`bobby`, add this line:



    www-data        ALL=(bobby) NOPASSWD: /usr/bin/crontab



which tells sudo not to ask for password when user `www-data` calls

`crontab` as user `bobby` using `sudo`



Now, you can access to the crontab of user `bobby` like this :



``` {.php}

$crontabAdapter = new CrontabAdapter('bobby', true);

$crontabRepository = new CrontabRepository($crontabAdapter);

```



Note the second parameter `true` of the CrontabAdapter constructor call.

This boolean tells the CrontabAdapter to use `sudo` internally when

calling `crontab`.



### Enable or disable a cron job



You can enable or disable your cron jobs by using the `setEnabled()`

method of a CronJob object accordingly :



``` {.php}

$crontabJob->setEnabled(false);

```



This will prepend your cron job with a `#` in your

crontab when persisting it.



### Write your own adapter

Additionally, if you cannot read another user's crontabs or if you are on a distributed architecture where crons are not 

run on the machine executing the jobs, you can create any other Adapter for your architecture 

by implementing the `CrontabAdapterInterface`.



You can then instantiate the `CrontabRepository` with your adapter.



Unit tests

----------



Tests have been written using PHPUnit and require version 5.3+. To

execute tests:



    $ phpunit /tests



If you installed the library using Composer and installed

dev-dependencies you can execute them using included PHPUnit as

dependency:



    $ ./vendor/bin/phpunit /tests



Contributions

-------------



... are welcome :)