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Description
If I call downloadPackage'
to a destination directory I haven't created yet, I get a weird error:
my-exe: /Users/bchinn/.cache/my-exe/package-index/hackage.haskell.org/01-index.tar: withFile: does not exist (No such file or directory)
This is weird because that filepath does exist.
Digging deeper, I found the issue occurs in the renameFile
call. Because I didn't create the destination directory yet, renameFile
errors with:
renameFile:renamePath:rename '/Users/bchinn/.cache/my-exe/package-index/hackage.haskell.org/Cabal-syntax-3.10.2.0.tar75518-0.gz' to '/Users/bchinn/.cache/my-exe/packages/Cabal-syntax-3.10.2.0': does not exist (No such file or directory)
But this error gets swallowed; presumably there's some clean up step that looks for 01-index.tar
and errors before showing the actual error.
A few action items:
- Document that
downloadPackage
requires directory to exist (or create the directory automatically if it doesn't) - Investigate why
withFile
complains about the file not existing when... it does? - Check if the destination exists beforehand and show a better error message (contingent on how 1 and 2 get resolved)
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