[MNG-6380] Option -Dstyle.color=always doesn't force color output - ASF JIRA

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Details

Type: Bug
Status: Closed
Priority: Minor
Resolution: Fixed
Affects Version/s: 3.5.3
Fix Version/s: 3.8.2, 4.0.0-alpha-2, 4.0.0
Component/s: None
Labels:
- workaround-exists

Description

When the output is not a TTY (e.g. on a CI server), the new option -Dstyle.color=always doesn't work, because JAnsi itself is disabling its color output.

# OK, produces color:
mvn -B -Dstyle.color=always package

# FAIL, doesn't produce color:
mvn -B -Dstyle.color=always package | less -R

# WORKAROUND:
MAVEN_OPTS=-Djansi.force=true mvn -B -Dstyle.color=always package | less -R

The -Dstyle.color=always option needs to imply -Djansi.force=true – otherwise, "always" doesn't really mean always.

The problem for the implementation is, that the JAnsi option needs to be set as a system property way early during startup.