Previously working pipeline bash now fails

[Kareem Straker]

I'm having a strange issue with Bitbucket Pipelines, where a previously working pipeline now fails without warning.

In this particular case I am, using bash, incrementing a variable of `0`.

(( VERSION_NUMBER_LIST[1]++ )); echo "${VERSION_NUMBER_LIST[0]}.${VERSION_NUMBER_LIST[1]} list version incremented";

What is especially confusing is that this worked fine before, and works in my local testing:

VERSION_NUMBER_OLD=0.0

IFS='.' read -ra VERSION_NUMBER_LIST <<< "$VERSION_NUMBER_OLD"; echo "${VERSION_NUMBER_LIST[0]}.${VERSION_NUMBER_LIST[1]} list version";
0.0 list version

(( VERSION_NUMBER_LIST[1]++ )); echo "${VERSION_NUMBER_LIST[0]}.${VERSION_NUMBER_LIST[1]} list version incremented";
0.1 list version incremented

Has anyone else encountered this strange error, or have any idea how to resolve.

My pipeline repeatedly fails due to this.

I'm using an Alpine 3.11 as my Docker image.

[Kareem Straker · Accepted solution]

Fixed it with:

VERSION_NUMBER_LIST[1]=$((VERSION_NUMBER_LIST[1]+1)); echo "${VERSION_NUMBER_LIST[0]}.${VERSION_NUMBER_LIST[1]} list version incremented";
0.1 list version incremented

 ¯\_(ツ)_/¯