Fstab configuration model example

Introduction

This example provides a configuration model for the /etc/fstab file.

This example s made of 2 files:

• FstabModel.pl contains the configuration model (as explained in Config::Model(3pm) and Config::Model::Node(3pm).
• fstab_test.pl will:
  1. read the fstab file
  2. store the configuration information in the config tree constructed from the model.
  3. extract a report from the model
  4. print on STDOUT a minimal fstab file
  5. print on STDOUT a fstab file with comments extracted from the help provided by the fstab model

The goal of this example is to be (relatively) easy to understand, not to be complete.

Note that you need to compile the module (perl Makefile.PL && make) to run the example, but you don't need to install the module.

Feel free to send me any modifications or enhancement of this example.

Output example

You can extract a minimal set of information from the model to re-create a minimal version of fstab file. For instance:

proc       /proc                proc            defaults        0 0
/dev/sda1  /                    ext3            defaults,errors=remount-ro 0 1
/dev/sda9  /home                ext3            defaults        0 2
/dev/sda8  /tmp                 ext3            defaults        0 2
/dev/sda5  /usr                 ext3            defaults        0 2
/dev/sda6  /var                 ext3            defaults        0 2
/dev/sda7  none                 swap            sw              0 0
/dev/hdc   /media/cdrom0        iso9660         noauto,user,ro  0 0
/dev/fd0   /media/floppy0       vfat            noauto,user,rw  0 0
/dev/sdb2  /mnt/gros            ext3            defaults        0 0
/dev/sdb3  /mnt/big             ext3            defaults        0 0
/dev/sdc1  /media/usb0          auto            noauto,user,rw  0 0
/dev/hdc   /media/cdrom         auto            noauto,user     0 0

Or, you can produce an file with comments:

# 'proc' file system: Kernel info through a special file system
#    * option 'defaults' effect: option equivalent to rw, suid, dev, exec,
#        auto, nouser, and async
proc       /proc                proc            defaults        0 0

# 'ext3' file system: Common Linux file system with journalling 
#    (recommended)
#    * option 'defaults' effect: option equivalent to rw, suid, dev, exec,
#        auto, nouser, and async
/dev/sda1  /                    ext3            defaults,errors=remount-ro 0 1

# 'ext3' file system: Common Linux file system with journalling 
#    (recommended)
#    * option 'defaults' effect: option equivalent to rw, suid, dev, exec,
#        auto, nouser, and async
/dev/sda9  /home                ext3            defaults        0 2

# 'ext3' file system: Common Linux file system with journalling 
#    (recommended)
#    * option 'defaults' effect: option equivalent to rw, suid, dev, exec,
#        auto, nouser, and async
/dev/sda8  /tmp                 ext3            defaults        0 2

# 'ext3' file system: Common Linux file system with journalling 
#    (recommended)
#    * option 'defaults' effect: option equivalent to rw, suid, dev, exec,
#        auto, nouser, and async
/dev/sda5  /usr                 ext3            defaults        0 2

# 'ext3' file system: Common Linux file system with journalling 
#    (recommended)
#    * option 'defaults' effect: option equivalent to rw, suid, dev, exec,
#        auto, nouser, and async
/dev/sda6  /var                 ext3            defaults        0 2

/dev/sda7  none                 swap            sw              0 0

# 'iso9660' file system: CD-ROM or DVD file system
#    * option 'user' effect: user can mount the file system
#    * option 'ro' effect: read-only file system
/dev/hdc   /media/cdrom0        iso9660         noauto,user,ro  0 0

# 'vfat' file system: Older Windows file system often used on removable
#    media
#    * option 'user' effect: user can mount the file system
/dev/fd0   /media/floppy0       vfat            noauto,user,rw  0 0

# 'ext3' file system: Common Linux file system with journalling 
#    (recommended)
#    * option 'defaults' effect: option equivalent to rw, suid, dev, exec,
#        auto, nouser, and async
/dev/sdb2  /mnt/gros            ext3            defaults        0 0

# 'ext3' file system: Common Linux file system with journalling 
#    (recommended)
#    * option 'defaults' effect: option equivalent to rw, suid, dev, exec,
#        auto, nouser, and async
/dev/sdb3  /mnt/big             ext3            defaults        0 0

# 'auto' file system: file system type is probed by the kernel when
#    mounting the device
#    * option 'user' effect: user can mount the file system
/dev/sdc1  /media/usb0          auto            noauto,user,rw  0 0

# 'auto' file system: file system type is probed by the kernel when
#    mounting the device
#    * option 'user' effect: user can mount the file system
/dev/hdc   /media/cdrom         auto            noauto,user     0 0