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build-system/haskell: Explain failure.

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Provide human-readable failure message and explain how to fix it.

* guix/build/haskell-build-system.scm (register): Raise error if source
file does not exist.
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Lars-Dominik Braun 2021-09-19 11:10:16 +02:00
parent edd912a128
commit b74ca403cb
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guix/build/haskell-build-system.scm
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@ -217,6 +217,8 @@ given Haskell package."
(if (not (vhash-assoc id seen))
(let ((dep-conf (string-append src "/" id ".conf"))
(dep-conf* (string-append dest "/" id ".conf")))
(when (not (file-exists? dep-conf))
(error (format #f "File ~a does not exist. This usually means the dependency ~a is missing. Was checking conf-file ~a." dep-conf id conf-file)))
(copy-file dep-conf dep-conf*) ;XXX: maybe symlink instead?
(loop (vhash-cons id #t seen)
(append lst (conf-depends dep-conf))))