Fix writeFile silently continuing on errors. #674
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For example, if the disk is full, it would write `metadata.json` as an empty file, and then later fail with a JSON parse error on the same file. Also implement good error messages using C, which `<iostream>` cannot do. For example, the above case would probably produce `metadata.json: No space left on device`.
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For example, if the disk is full, it would write
metadata.jsonas an empty file, and then later fail with a JSON parse error on the same file.Also implement good error messages using C, which
<iostream>cannot do. For example, the above case would probably producemetadata.json: No space left on device.Please check that it works well on Windows, too. I only tried it on Linux.