Скачать или смотреть Resolving `Android AOSP Build Failures: Troubleshooting Build_Image.py Errors for Android 10

A comprehensive guide to fixing build errors in Android AOSP for version 10.0.0_r39, focusing on issues related to file systems and output directories.
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Troubleshooting Android AOSP Build Errors: A Deep Dive into Build_Image.py Failures for Android 10.0.0_r39

Building Android Open Source Project (AOSP) can sometimes be a daunting task, especially when faced with unexpected errors. One common issue developers encounter is a failure during the image building process, specifically when executing build_image.py for Android version 10.0.0_r39 on Ubuntu 20.04 LTS. This guide aims to shed light on this problem and provide an effective solution to help you get back on track.

Understanding the Problem

When attempting to switch to the blueline device, developers often face messages indicating a failed build, particularly with error codes related to out-of-space conditions or file system issues. Here’s a peek at the error summary:

Error Message: "Failed to build out/target/product/blueline/obj/PACKAGING/systemimage_intermediates/system.img from out/target/product/blueline/system"

Common Indicators: Errors often mention issues like "Could not allocate block in ext2 filesystem" or problems relating to the filesystem being used.

This leads to the main question: What is causing these build failures during the image creation process?

Diagnosing the Cause

The root of this problem typically lies in the type of filesystem you are using for your builds. For instance, it has been noted that builds fail when targeting filesystems like ZFS. Conversely, switching to an ext4 filesystem resolves the issue.

Key Factors to Consider:

Supported Filesystems: It’s crucial to use a compatible filesystem that can handle the size and structure of the data being written during the build.

Output Directory Location: Check the configuration of your output directory; inappropriate paths or permissions can lead to write failures.

A Practical Solution

To rectify this issue, you can redirect where your build images are written by changing the OUT_DIR_COMMON_BASE environment variable. Follow these steps to implement this change:

Step-by-Step Guide:

Open your terminal.

Set the output directory by executing the command:

[[See Video to Reveal this Text or Code Snippet]]

Replace /path/to/ext4/builds with your actual ext4 filesystem mount point.

Re-run your build command.

[[See Video to Reveal this Text or Code Snippet]]

This simple adjustment should redirect the output to a compatible filesystem, allowing the build process to complete successfully.

Conclusion

Getting familiar with Android AOSP build processes can be challenging, but understanding your environment and how filesystem compatibility affects builds can save you considerable time and headaches. By ensuring you are using a compatible filesystem and redirecting your output directory, you can overcome these build_image.py failures effectively.

If you encounter persistent issues after implementing these changes, it may be worthwhile to revisit your system configurations, check for package updates, or consult community forums for further assistance.

Remember, building AOSP is not just about coding—it's about building a sustainable environment that can effectively handle your development requirements. Happy coding!