Improve handling of paths with invalid Windows characters #9276
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Add validation and clear error messages for gems with filenames containing invalid Windows characters (e.g., colons), directing users to report issues to gem authors instead of RubyGems.
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larskanis
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Feb 11, 2026
| out.flush | ||
| out.chmod file_mode(entry.header.mode) & ~File.umask | ||
| end | ||
| rescue Errno::EINVAL |
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Thank you for providing this PR!
Is the rescue really necessary? The filenames are checked for invalid characters in advance, so why infer that EINVAL is due to an invalid character? This doesn't make sense on non-Windows OS either.
larskanis
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Feb 11, 2026
| def add_files(tar) # :nodoc: | ||
| @spec.files.each do |file| | ||
| if invalid_windows_filename?(file) | ||
| alert_warning "filename '#{file}' contains characters that are invalid on Windows (e.g., colons). This gem may fail to install on Windows." |
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The filenames are checked when packaging a gem, which is a very good thing. Could you add a test for it as well?
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What is your fix for the problem, implemented in this PR?
Fixes #7681
Windows doesn't allow certain characters in filenames (e.g., colons) that are valid on Unix. When gems contain files with these characters, installation fails on Windows with cryptic
Errno::EINVALerrors.This PR adds validation and directs users to report issues to gem authors instead.
InvalidFileNameErrorwith user-friendly messagesMake sure the following tasks are checked