fix: use 0700 permissions for all temporary directories#766
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The `tempfile` crate defaults to world-readable permissions for temporary directories, which we don't want. Instead, make a wrapper for creating tempdirs that sets 0700 permissions, and use this wrapper throughout the codebase. Also change the prefix for tempdirs to "bluebuild-tmp-" so the source of tempdirs is clear if they aren't cleaned up, and increase the number of random bytes in the name to 10 to match the behavior of `mktemp`.
gmpinder
approved these changes
Apr 27, 2026
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The
tempfilecrate defaults to world-readable permissions for temporary directories, which we don't want. Instead, make a wrapper for creating tempdirs that sets 0700 permissions, and use this wrapper throughout the codebase.Also change the prefix for tempdirs to "bluebuild-tmp-" so the source of tempdirs is clear if they aren't cleaned up, and increase the number of random bytes in the name to 10 to match the behavior of
mktemp.