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17 lines
680 B
Nix
17 lines
680 B
Nix
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{ runCommand, cabal-install
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, indexState ? "2019-04-24T21:34:04Z"
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} :
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let
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# To avoid downloading more data than necessary this will provide a base.
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cachedState = runCommand "hackage-${builtins.substring 0 4 indexState}" {} ''
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mkdir -p $out
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HOME=$out ${cabal-install}/bin/cabal update --index-state='${builtins.substring 0 4 indexState}-01-01T00:00:00Z'
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'';
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in runCommand "hackage-${builtins.replaceStrings [":"] [""] indexState}" {} ''
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mkdir -p $out
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cp -r ${cachedState}/.cabal $out
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chmod +w -R $out/.cabal
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sed -i.back -e "s|${cachedState}|$out|g" $out/.cabal/config
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HOME=$out ${cabal-install}/bin/cabal update --index-state='${indexState}'
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''
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