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-rw-r--r--src/Propellor/Bootstrap.hs4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/Propellor/Bootstrap.hs b/src/Propellor/Bootstrap.hs
index b2cf5609..089def51 100644
--- a/src/Propellor/Bootstrap.hs
+++ b/src/Propellor/Bootstrap.hs
@@ -109,7 +109,9 @@ build = catchBoolIO $ do
-- This ensures that the propellor symlink only ever points at
-- a binary that is fully built. Also, avoid ever removing
-- or breaking the symlink.
- unlessM (boolSystem "cp" [Param cabalbuiltbin, Param (tmpfor safetycopy)]) $
+ --
+ -- Need cp -a to make build timestamp checking work.
+ unlessM (boolSystem "cp" [Param "-a", Param cabalbuiltbin, Param (tmpfor safetycopy)]) $
error "cp of binary failed"
rename (tmpfor safetycopy) safetycopy
createSymbolicLink safetycopy (tmpfor dest)