using bash to increase release version and git push

Question

I am a beginner with BASH I am trying to automate the following process:

• get release version --> file "release"
• increase it
• save it again in the same file "release"
• git add all
• git commit "releaseX"
• git push

I will call this file releaseit.sh

for that I start with some code I got from: Extract version number from file in shell script

BASH:
read version < release
echo $version
echo ${version%.*}.$((${version##*.}+1)) 

How do I pass the last line to a variable and save it again into release file?

Desired result: if release contains 0.1.34 a new release file will contain 0.1.35 will be added committed and pushed.

Answer 1

Disregarding the discussion of whether you should do it or not, you could do this:

#!/bin/bash

read version < release
echo $version
nextversion=${version%.*}.$((${version##*.}+1))
echo "$nextversion" >release

Same as Stanislav's answer above, just storing it in a variable, if you ever need it later in the script.

Answer 2

You really don't want to do this. The release number should not be stored in a file in the repo, since doing this will lead to multiple commits in the repo that all share the same version. This is a recipe for disaster. However, if you do want to do this, you might want something like:

#!/bin/sh

version_file=release

if test "$1" != "-f" && git rev-parse HEAD > /dev/null 2>&1 \
        && ! git diff-index --quiet HEAD; then
    echo 'Repo is dirty.  Aborting' >&2
    exit 1
fi

IFS=. read maj min patch < "$version_file"

if { ! test "$maj" -ge 0 || ! test "$min" -ge 0 || ! test "$patch" -gt 0; } 2>/dev/null; then
    echo "Invalid version in $version_file.  Aborting" >&2
    exit 1
fi
case $1 in
maj) : $(( maj += 1 ));;
min) : $(( min += 1 ));;
*) : $(( patch += 1 ));;
esac

ver="$maj.$min.$patch"
echo "$ver" > "$version_file" || exit
git add "$version_file" || exit
git commit -m "Increment version to $ver" || exit
git push || exit

Answer 3

Just use > to overwrite the file content:

read version < release
echo ${version%.*}.$((${version##*.}+1)) > release

But I'd agree with the comments - you shouldn't store your build version in Git, read this.