When using narou-docker, the following error occurred during the Dockerfile build process.<\/p>\n
internal:\/usr\/local\/lib\/ruby\/3.3.0\/rubygems\/core_ext\/kernel_require.rb>:127:in `require': cannot load such file -- tilt\/erubis (LoadError)<\/pre>\nIn this article, we explain the cause of this error and the solution posted in GitHub Issue #443<\/a>.<\/p>\n
Background of the Error<\/h2>\n
Inside narou 3.9.1, tilt<\/a> is used as the template engine. Traditionally, a module called
tilt\/erubis<\/code> existed, but due to modern environments and gem updates, cases where erubi<\/a> is used instead of erubis have been increasing.<\/p>\nThis error is caused by the fact that even though narou requires
tilt\/erubis<\/code>, the corresponding file no longer exists. Because tilt dropped support for erubis, this issue occurred upon starting narou-docker.<\/p>\nSolution<\/h2>\n
The solution recommended in GitHub Issue #443<\/a> is as follows.<\/p>\n
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Install erubi<\/strong>
First, install version 1.13 of the erubi gem within the Dockerfile. This makes the latest erubi available.<\/p>\n<\/li>\n- \n
Replace the Reference in the Code<\/strong>
In narou’s internal code (\/usr\/local\/bundle\/gems\/narou-3.9.1\/lib\/web\/appserver.rb<\/code>), replace the reference totilt\/erubis<\/code> withtilt\/erubi<\/code>. By using the sed command, the replacement process is executed automatically at build time.<\/p>\n<\/li>\n<\/ol>\nA specific example of part of the Dockerfile is shown below.<\/p>\n
\ndockerfile<\/div>\n\n# Dockerfile \u306e\u4e00\u90e8\u4f8b\n&& gem install narou -v ${NAROU_VERSION} --no-document \\\n&& RUN gem install erubi -v 1.13 --no-document \\\n&& sed -ie \"s\/tilt\\\/erubis\/tilt\\\/erubi\/g\" \/usr\/local\/bundle\/gems\/narou-3.9.1\/lib\/web\/appserver.rb<\/pre>\n<\/div>\n<\/div>\nWe have confirmed that this configuration correctly replaces the template engine module referenced by narou and resolves the error.<\/p>\n
Explanation and Discussion<\/h2>\n
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Why erubi?<\/strong>
erubi is being developed as the successor to erubis, offering improvements in performance and security. By modifying narou’s code, we can maintain compatibility suited for modern environments.<\/p>\n<\/li>\n- \n
Using the sed Command<\/strong>
The key point is using the sed command inside the Dockerfile to automatically patch narou’s source code during the build. This eliminates the hassle of manual fixes or applying patches.<\/p>\n<\/li>\n- \n
Future Outlook<\/strong>
Since this matter has also been discussed in GitHub Issue #443<\/a> and the fix has been merged into the develop branch, it is expected to be officially supported in future updates. It is recommended to check for project update information regularly.<\/p>\n<\/li>\n<\/ul>\nConclusion<\/h2>\n