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Avoid backtraces on expected failures when built with ghc 8; only use backtraces for unexpected errors.

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ghc 8 added backtraces on uncaught errors. This is great, but git-annex was
using error in many places for a error message targeted at the user, in
some known problem case. A backtrace only confuses such a message, so omit it.

Notably, commands like git annex drop that failed due to eg, numcopies,
used to use error, so had a backtrace.

This commit was sponsored by Ethan Aubin.
This commit is contained in:
Joey Hess 2016-11-15 21:29:54 -04:00
parent 69915c6c9b
commit 0a4479b8ec
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116 changed files with 287 additions and 270 deletions
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4
Command/SetKey.hs
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@ -23,10 +23,10 @@ start :: [String] -> CommandStart
start (keyname:file:[]) = do
showStart "setkey" file
next $ perform file (mkKey keyname)
start _ = error "specify a key and a content file"
start _ = giveup "specify a key and a content file"
mkKey :: String -> Key
mkKey = fromMaybe (error "bad key") . file2key
mkKey = fromMaybe (giveup "bad key") . file2key
perform :: FilePath -> Key -> CommandPerform
perform file key = do