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Summary: The new filesystem code accidentally asks for write attributes permissions when doing read-only access. I believe this is what's causing the GHC 8.6.1 tarballs to fail when installed to a privileged location. I haven't been able to reproduce the issue yet, but this permission bit is wrong anyway. Test Plan: I'm still trying to workout how to test that this works, changing the permissions on the folder doesn't seem to reproduce the error on a tarball I made from before the change. Reviewers: bgamari, tdammers Reviewed By: bgamari Subscribers: tdammers, monoidal, rwbarton, carter GHC Trac Issues: #15667 Differential Revision: https://phabricator.haskell.org/D5177
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