bash.md

Bash Script

Introduction

Bash script allows 5 arguments (0 mandatory, 5 optional)

• head (optional): head value. The first component of the version. Default is 0 (zero).
• build (optional): build value. The last component of the version. Default is 0 (zero).
• suffix (optional): it will be attached at the last.
• date (optional): force date

How to Use

./script.sh head=15 build=383 suffix=qa

when using override_version parameter, given head, yearweek, build values will be ignored. ./script.sh override_version=15.1827.383

Code

#!/bin/bash

version=""
yearweek=""
year=`date +%Y`
weeknumber=`date +%V` # ISO Standard week number

for ARGUMENT in "$@"
do
    KEY=$(echo $ARGUMENT | cut -f1 -d=)
    VALUE=$(echo $ARGUMENT | cut -f2 -d=)  
 
    case "$KEY" in
            head)              head=${VALUE} ;;
            build)              build=${VALUE} ;;
            suffix)              suffix=${VALUE} ;;
            override_version)     override_version=${VALUE} ;;
            date)              forced_date=${VALUE} ;;
            *)
    esac
done

# region making yearweek
if [ ! -z ${forced_date} ]; then
    echo "Date is set to ${forced_date}"
    year=`date -u -d ${forced_date} +%Y`
    weeknumber=`date -d ${forced_date} +%V`
fi

# this prevents from having 1801 at the last week of the year 2019. It should be 1901.
if [[ ${weeknumber} -eq 1 ]] && [[ `date -u -d ${forced_date} +%-d` -gt 20 ]]; then
   year=$(expr ${year} + 1)
fi

# this prevents from having 1053 at the last week of the year 2010. It should be 0953.
if [[ ${weeknumber} -ge 52 ]] && [[ `date -u -d ${forced_date} +%-d` -le 7 ]]; then
    year=$(expr ${year} - 1)
fi

yearweek="${year:2:2}${weeknumber}"
# endregion making yearweek


if [ -z ${override_version} ]; then
    # By default, version is set to 0.
    if [ -z ${head} ]; then
        head="0"
        echo "- Warning: no head value. set to 0 by default."
    fi
 
    # By default, build is set to 0.
    if [ -z ${build} ]; then
        build="0"
        echo "- Warning: no build value. set to 0 by default."
    fi
    version="$head.$yearweek.$build"
else
    echo "- Warning: head, build, suffix values will be ignored"
    version=${override_version}
fi

# append suffix
if [ ! -z ${suffix} ]; then
    version="$version+$suffix"
fi

printf "version: $version\n"