substring from variable in Bamboo script task

[Jules Alberts]

Hi everyone,

In Bamboo, I want a build to stop executing the following tasks based the last part of a variable. To be more specific: I only want to continue if the Maven version of the project I'm working on is a SNAPSHOT. I installed the Maven pom value extractor plugin, and now I have the project version, but how do I get the last part of that variable? I tried these:

#!/bin/bash
echo "========================================================"
echo Maven version is ${bamboo.maven.version}
echo Last 10 pos is ${bamboo.maven.version:(-10)}
echo ${bamboo.maven.version} | tail -c 10
echo "========================================================"

but they give these errors:

13-Nov-2018 12:44:17     ========================================================
13-Nov-2018 12:44:17     Maven version is 2.0.3-SNAPSHOT
13-Nov-2018 12:44:17     /opt/atlassian/bamboo/temp/DLWO-YLAN-BA-37-ScriptBuildTask-1970695706317157380.sh: line 5: ${bamboo.maven.version:(-10)}: bad substitution
13-Nov-2018 12:44:17     tail: cannot open `10' for reading: No such file or directory
13-Nov-2018 12:44:17     ========================================================

These commands work when run from a normal shell script. What can I do in a Bamboo script task to achieve this?

TIA,

Jules.

[Daniel Santos · Accepted solution]

Hi Jules,

Let me share a header we have in Bamboo on plan and global variables pages, which might explain why this is failing:

For task configuration fields, use the syntax ${bamboo.myvariablename}. Bamboo also supports nested variables. For instance, if you set variableName = world, and variable.value = Hello ${bamboo.variableName}, Bamboo will resolve it as Hello world. For inline scripts, variables are exposed as shell environment variables which can be accessed using the syntax $bamboo_MY_VARIABLE_NAME (Linux/Mac OS X) or %BAMBOO_MY_VARIABLE_NAME% (Windows).

Please try:

echo Last 10 pos is ${bamboo_maven_version:(-10)}
echo ${bamboo_maven_version} | tail -c 10

[Jules Alberts]

Thanks for pointing this out Daniel, it works now.

[Daniel Santos]

You are welcome! =]