How to resolve xcpretty locale error launched from GitLab CI

When running XCTest using GitLab’s CI, the job may fail with the following error output.

/Library/Ruby/Gems/2.6.0/gems/xcpretty-0.3.0/lib/xcpretty/parser.rb:434:in `===': invalid byte sequence in US-ASCII (ArgumentError)
	from /Library/Ruby/Gems/2.6.0/gems/xcpretty-0.3.0/lib/xcpretty/parser.rb:434:in `update_test_state'
	from /Library/Ruby/Gems/2.6.0/gems/xcpretty-0.3.0/lib/xcpretty/parser.rb:307:in `parse'
	from /Library/Ruby/Gems/2.6.0/gems/xcpretty-0.3.0/lib/xcpretty/formatters/formatter.rb:88:in `pretty_format'
	from /Library/Ruby/Gems/2.6.0/gems/xcpretty-0.3.0/lib/xcpretty/printer.rb:19:in `pretty_print'
	from /Library/Ruby/Gems/2.6.0/gems/xcpretty-0.3.0/bin/xcpretty:84:in `block in <top (required)>'
	from /Library/Ruby/Gems/2.6.0/gems/xcpretty-0.3.0/bin/xcpretty:83:in `each_line'
	from /Library/Ruby/Gems/2.6.0/gems/xcpretty-0.3.0/bin/xcpretty:83:in `<top (required)>'
	from /usr/local/bin/xcpretty:23:in `load'
	from /usr/local/bin/xcpretty:23:in `<main>'
2022-06-28 19:15:17.149 xcodebuild[28965:188047] NSFileHandle couldn't write. Exception: *** -[_NSStdIOFileHandle writeData:]: Broken pipe

This article explains how to solve this problem.


Error Cause

This error is caused by a string in the log output by xcodebuild that xcpretty cannot process, xcpretty crashed and xcodebuild to be unable to output the log.


You can solve this problem by correctly setting the locale of gitlab-runner. Do as follows.

Open the ~/Library/LaunchAgents/gitlab-runner.plist file.
Add the EnvironmentVariables as follows.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "">
<plist version="1.0">

<!-- 省略 -->

Reboot your machine, or relaunch gitlab-runner as follows.
gitlab-runner stop
gitlab-runner start
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Author of this article

Akira Hayashiのアバター Akira Hayashi Representative, Software Engineer

I am an application developer loves programming. This blog is a tech blog, its articles are learning notes. In my work, I mainly focus on desktop and mobile application development, but I also write technical books and teach seminars. The websites of my work and books are here -> RK Kaihatsu.