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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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GPG key ID: C910D9222512E3C7
116 changed files with 287 additions and 270 deletions
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4
Assistant/Threads/Watcher.hs
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@ -65,10 +65,10 @@ checkCanWatch
#else
noop
#endif
| otherwise = error "watch mode is not available on this system"
| otherwise = giveup "watch mode is not available on this system"
needLsof :: Annex ()
needLsof = error $ unlines
needLsof = giveup $ unlines
[ "The lsof command is needed for watch mode to be safe, and is not in PATH."
, "To override lsof checks to ensure that files are not open for writing"
, "when added to the annex, you can use --force"