Plugin: length

• infos = Information about the len plugin is in keys below
• infos/author = Philipp Oppel phili.nosp@m.pp.o.nosp@m.ppel@.nosp@m.tuwi.nosp@m.en.ac.nosp@m..at
• infos/maintainer = Florian Lindner flori.nosp@m.an.l.nosp@m.indne.nosp@m.r@st.nosp@m.udent.nosp@m..tuw.nosp@m.ien.a.nosp@m.c.at
• infos/licence = BSD
• infos/needs =
• infos/provides = check
• infos/recommends =
• infos/placements = presetstorage postgetstorage
• infos/status = unittest nodep
• infos/metadata = check/length/max
• infos/description = validates if input is less or equal to length and throws error otherwise

Length Validation

Introduction

This plugins purpose is to check the maximum length of strings. For example if check/length/max is set to 3, Strings with more than 3 characters will not validate (e.g. "abcd"), whereas "abc" would validate.

Installation

See installation. The package is called libelektra5-experimental.

Usage

# Mount `length` plugin to cascading namespace `/tests/length`
kdb mount config.dump /tests/length length
 
# Check the validity of the string stored in `/tests/length/text`
kdb meta-set spec:/tests/length/text check/length/max 3
 
# Try to set a longer string
kdb set user:/tests/length/text abcd
# STDERR: .*Validation Semantic.*
# ERROR:  C03200
# RET:    5
 
# Set a correct string
kdb set user:/tests/length/text abc
kdb get user:/tests/length/text
 
# Undo modifications to the database
kdb rm -rf /tests/length
kdb umount /tests/length

Limitations

The plugin only checks that strings are not longer than a given number. It is not possible to set a minimum length.